How to Use Seafoam on a Motorcycle with Carbs - Honda Nighthawk 450
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- เผยแพร่เมื่อ 7 เม.ย. 2015
- I attempted to fix a hesitation and backfiring problem on my Honda Nighthawk CB450SC using Seafoam. I left 100% seafoam in the carburetor bowls overnight, then added 8 to 9 capfuls of seafoam in the tank. I noticed a 50% improvement in the hesitation problem, but the backfiring is still present.
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This is the best method of Seafoaming if you want to let it sit in the carbs overnight. Your method is the simplest and requires only a beer bottle and a funnel. Great camera work, no bullshit title cards or bad music, or shameless self promotion. Great.
LOL yeah no, fill the tank and use the amount per gallon and run it that will work best as it will clean the tank and carbs
seafoam in the gas tank + long ride = SMOKE OUT!
5-8 caps, I usually go to 1-2 glug glugs
Typical Europeans
Bro!!! 1-2 glug glugs 🤣🤣🤣
Lmao me too
Appreciating the helpful editing in this vid. You really get to see everything you need to know step by step.
Mine sat for a few months over winter, first ride out was bogging and jumping like a kangaroo.
Drained fuel tank, replaced with premium fuel and changed inline fuel filter, and changed air filter and plugs to new ones.
Still ran like crap so warmed up bike, opened up to see carb intake and gently poured seafoam into carbs while running until she wanted to die and revved.
Boat loads of white smoke, and repeated twice until she spluttered and suddenly as quick as that she idled perfectly.
Put everything back together and went for ride, she was back to her former self and responsive once again.
Put 60ml in 15 litres of fuel tank and ran it hard down motorway.
Result in massive difference and is now part of my routine maintenance to pour into carbs each start of riding season, plus run it in tank every other full tank.
About to do the same thing with my V Star 1100. Hoping it will fix the odd idle. This is the best video I've seen on using Seafoam in a bike.
hey nice bike! i have an 85 cb45sc. been watching dawino6260's videos for years. recently moved to FL, and decided to visit the guy. he is the guru of all bikes like ours. mine would pop and backfire occasionally on letting off throttle too suddenly. he pointed to a "air pump diaphragm" on the side near the fuel inlet. said that it was just now beginning to fail. try looking him up. real nice old hippy. hhh cycles in Venice fl. anyways I thoroughly enjoyed your documentary! I used to wash mine as a kid and dad used to say maybe he would give it to me one day. he finally did. it sat for a while so I've already been through all the tricks to remedy symptoms of sitting. one of the worst things were the switches. i tried all sorts of contact cleaners and had to work them back and forth for a while. i hit them with a spritz of wd 40 occasionally. the ignition switch had to be taken apart and the little contacts cleaned. theres a guy polecat or something, has great videos on the same family of bikes like the 400t hawk. anyways happy riding, and we totally love your videos!
Nice Bike. Nighthawks are good ones. I had a 94 750cc Nighthawk. Loved it.
such an easier thing to follow than other vids. thanks man
BrownBrady Great video. I always wondered if the sea foam works. I should have used it on my old 1998 Suzuki LS650, before I got rid of it, due to some head gasket problems, front fork seal, and oil leaking out of the exhaust pipe. You can see how bad it was by checking out my old motorcycle vlogs playlist on my channel. I even had problems with it not getting good fuel efficiency. The bike I have now, is great. It is a 2014 Honda CTX 1300 Deluxe, with ABS and Traction Control and Bluetooth.
Thanks for the info, I thought I had trash in my tank on my 84 Harley. Also found out older bikes have some carb troubles and the peacock is in the middle so at the bottom of the tank is trash so when you fill up it mixes. When it gets warm out that's my plan. Also careful of peacock. They can go bad also and won't use reserve so you will be using only one side of tank💯 thanks again for video
Back firing is often something to do with the ignition timing. That is the timing is out to the point where the ignition occurs while the exhaust valve is open a little when it should be closed. But I imagine that these bike had CDI by the time this one was made. However, if it doesn't have the standard mufflers then they may not create the amount of back pressure needed to to prevent unburnt fuel, igniting inside the exhaust. If you have constant velocity carbs and you have mufflers other than stock mufflers it could be running too rich. Anyway the valve clearances are something else to check, so I would check the valve clearances and if this one has shims for adjustment I would get someone to do the shims for you. But if you can adjust the tappets yourself check you manual to see how to do it. Have fun.
Granted this video is old... I was having an occasional leak of fuel from the float bowls overflow on my 2005 Katana 750. I tried a half bottle of Berrymans B12 with a tank of gas and nothing changed too much. I was still getting the occasional dripping which would cause the bike to idle rough while it did it. While riding the bike ran fine once moving along....few weeks later I decided to dump an Entire can of Seafoam in my tank with a full 5 gallons of gas. Over the course of the tank my bike would do the white smoke deal. The bike began to run smoother throughout the whole RPM range and it has idled just fine and so far...no more floats dripping. Fingers crossed doing this just cleared up my carbs and possibly freed up a stuck float.
Great video man. Nice, light, easy. Keep up the great work.
If you still facing problem with miss fire while reducing the throttle at comparatively higher speed, it may be due to air ingress in exhaust pipe (silencer), check for it and try to fix it, it may solve your problem.
Only intake manifold air leaking will also disturb your bike idling.
Happy thumping and sage drive,,
Hi...good post....I'm a motorcycle collector and the older 450s are one of my favorite vehicles. Light, powerful, and so much fun. My mainstay are Harleys but I love my Hondas too. Presently I have a 1986 Nighthawk 450SC and previously I owned an older 450 Nighthawk....both with fuel problems from rusty tanks. I can say from personal experience that taking the carbs apart is no fun, but were loading up and with CA smog equipment, fuel was also loading in the air box...very dangerous. I found the floats to be out of adjustment and dumping a rich mixture and raw fuel exploding in the tail pipes. I also noticed the petcock was loading the smog lines with fuel because of a defective and frozen vacuum unit on the petcock, also dumping fuel into the air box. The filter on the bottom of the carbs is near worthless and recommend an inline filter directly out of the petcock for any debris matter from the tank. After I super cleaned the tank, completely took apart the carbs and cleaned all needle valves, the mid range lag you are talking about is no longer a problem, no loading and no backfiring. Hope this helps.....Like you, I didn't want to tear into the carbs, but finally caved and tore them completely apart and cleaned....old, varnished, bowl full of debris, and marginal needle valve operation. All is good now.
Kenneth Coffey Thanks for sharing your story. I would like to rebuild the carbs as well and hopefully get the same results as you. But at the moment, I find that the hesitation diminishes after the bike has completely warmed up. I think the seafoam really helped. So I think I will leave it as is for now and maybe attempt to do it at the end of the season. Thanks again.
Sounds great....the Seafoam is a new to me product. Thanks for sharing. Which might also help is my experience with cleaning motorcycle fuel tanks, antique automobiles and the last a completely varnished 450 SL Mercedes and a real hassle to clean. I've watched You Tube on various application of cleaning tanks....some very creative, however the best for me was the least work and what I thought was the most efficient cleaning. I pour gallons of distilled white vinegar and seal off the tank, allow it to remain in the tank for three to five days....couldn't believe how beautiful the tanks were after a no hassle soak. I blew out the remaining crud, floating rust and varnish particles with water and rinsed many times until the water was clean. Every time I approach a bad tank in this manner I've had 100% success. Just a thought.
I thought backfiring was a bad thing too, but I talked to a mechanic and it also depends on how you a shift, if you down shift alot instead of braking it will backfire too, they sell exhausts that are meant to have that backfire sound cuz it some people's personal preference to sound like firecrackers when your ridin...ride safe bro
the directions for the use of seafoam, is 1 ounce of seafoam per 1 gallon of gas, ride the bike with that mix in the gas tank, in other words, seafoam is more like a fuel additive, and using it this way, my bike is idling smoother, and running with 100% improvement. I recently bought this 03 honda shadow, that was previously owned by a cancer victim who no longer could ride and had the bike sitting in his garage without ever being started up.. It had a rough idle and backfiring, not anymore though.
1 oz of seafoam and 1 gallon of gas everytime you ride? Or just a once in awhile thing?
@@Justintime246 once in awhile... but it's cheap enough to use at every fill up 😁
Great video!
Great video. Gonna try this on my 1980 CM400T. Thank you!
Good luck! Let me know how it goes.
Im a huge fan of mmo My wing always has an ounce in every full tank of gas. 83 gl1100
Check for vacuum leaks by spraying some brake cleaner around the boots. It will surge if there is a leak, replace the boots if necessary. Next, check your valve clearances. Plenty of videos on how to do it. You look like you are able to turn a wrench so have at it. Finally, pull the carbs off, remove the bowls, clean them up nice and remove the two jets in each and spray with care cleaner followed by compressed air. Reassemble, and finally, you should get the carbs synced. Replace the plugs and you should be good to go. Always run a bit of Seafoam in the tank. It helps to prevent varnish in the carbs.
Backfiring is usually a bike running to lean. Pull carbs off and actually clean the bowls and jets/ passages. Seafoam is good but its a additive not a fix all by any means. Check the airfilter and clean or replace that. If its a aftermarket airfilter that is the problem causing it to run too lean. Replace with factory air filter or get you some new jets for the carbs to make more gas. Carbs may need tuned as well. Also if exaghts was.modified that will lean carbs out. When i moded my bike(less resistance exaghts and high intake air filter i rejetted carbs. No more bike farting and more peep on throttle. Good luck
Nice vid!
Very well done. Thanks for posting.
Good vid good info. Thanks
Subscribed! Keep up the good work man!
***** Awesome, thanks bro.
For the backfiring, drain the floatbowls and fill them with acetone and leave it in for a half hour. This will remove any varnish on the jets or needles and increase you F:A ratio. Tony Surridge, I too have a cb450sc.
Great video thanks will use this method on my GPZ
+Rob Hughes Awesome, let me know how that turns out.
BrownBrady it works like magic the more sea foam you add the better it cleans I put 2 cans in my yzf250 and it fixed my bike look up there TH-cam channel
Would this be good for cleaning and lubing your bike chain??
faulty accelerator pump? not sure if the cb450sc has one tho
Can you tell me about oil getting in the carburetor
thanks bro
Dooood nice video. Sweet vintage Honda. My Harley (1985 Sportster with Super E carb) had occasional backfiring and hesitation as well. It ended up being two problems: fuel line restriction caused inadequate fuel to be delivered and the main jet was clogged. I don't know if my symptoms were the same as yours, but I would suggest you take out the jets and blow them out with compressed air. You should be able to access the jets just by pulling the bowl (you might not have to completely remove the carb). When you get them out look through the hole into a light (the sky or something) to make sure you can see clearly through the jet. After that just put it back together and tune the carburetor properly. Rich or lean could cause problems, including rough running and backfiring. Do you have a factory service manual?
CasternHead Thanks, this was a good tip. I just had a look at the bowls but unfortunately, I cannot access the screws without removing the carbs. :( I'll try it near the end of the season though.
💀yoo just put it on the tank the more you add the better it cleans it legit fixed my carb problem on my yzf 450 I got a 1.1 gallon tank I put 2 cans of sea foam in my tank and half in my old it works way better
Wretched monkey half in the old? What did you mean by that? I plan to just do what youre saying but im confused by the very end of your comment
I put the entire bottle in my 05 katana 600 usually around half a tank and fill it up and just pure highway once I get to about a quarter tank fill up and go about my day home more riding outcomes very
Hey nice video glad the foam helped, I recently bought a 2013 CBR 250r similar to yours but all black. I have a an issue with the bike though, I cant seem to get it over 60 mph. Is this common? Is it because the engine size?
Carlos Ortega That's not normal, bro. The CBR 250R is capable of up to 80 mph, and even more if there was no hill or head wind.
Carlos Ortega Carlos....My wife has a 250 Rebel. She weighs 110 lbs....still gutless. I weigh 185 and and bike although fun, lacks the power you might be wishing for. For me they are marginal on the freeway.
I had backfiring issue and my vaccum hose was leak. Once it was air tight, backfiring stopped.
There should be a screen inside of the fuel petcock ,just check a video on TH-cam for your year and bike,sounds like it is clogged, tif it is take it out and clean it ,and you should be back to running perfect,Mark
Probably not a problem anymore but I've read that backfiring and hesitation can be due to a head gasket leak.
check your fuel and air filter.
That's usually caused from a dirty gas tank and a dirty fuel filter. Myne was the same until I cleaned reserve tank and changed out the inline fuel filter.
Change your spark plugs. A fouled plug is likely causing the backfires.
Fouled plug...change it out
@@loumalott2485 chk the gap
Same problem with my Kawasaki z500 , back fires like a dog, got down to a air leak
same thing i did except all sea foam in thr fuel line no mix. draining tomorrow and will see if it stops my leak or i have to clean carb
kareem mckelvey did it work?
"Seafoam" and "Marvel Mystery Oil" are great names from a marketing perspective.
All of my small engines live on Seafoam, Marvel Mystery Oil, and 91octane (non ethanol).
I've experienced superior results with this blend.
i rebuilt my carbs, with knowing how it all routes the gasoline. I don't see how seafoam sitting overnight would do anything but clean the fuel delivery to the bowls and the bowls themselves. The jets wouldn't pick it up and the engine won't be on. That step was pretty much pointless, you could have achieved the same if not better result. if you removed the bowls and blasted the insides with carb cleaner. if you're getting backfires it's because your engine is running to rich and so there's too much fuel or too little spark.
the spark plugs reacting badly to the seafoam should have been a big hint.
Got over 26K on my 2009 Vstar without it. Runs like a bat outa hell! You don't know what your talking bout Cuz.
What do your plugs look like? You can tell a lot about your mix from their condition. I also found putting iridium plugs in my '81 xs1100 fixed some of the popping/backfiring issues I was having.
ScottyDog I haven't taken them out yet because I don't have the correct spark plug sockets. I will pull them near the end of the season.
BrownBrady did you ever do it?
More sea foam..long ride....then adjust your idle/air/fuel screws to lose the backfire
Backfiring can be lean running condition, normally it's that.
I have recently purchased a 2000 Honda Valkyrie. Previous owner said sea foam would damage, corrupt carbs. I've heard to use an ounce per gallon of gas. Is this ok? What about using non ethanol gas with carbed bike? Thanks.
These bikes were designed to run on non-ethanol gas. If you can find it, use it.
Thanks
I have a 04 kawasaki vulcan 750 and someone recommended I use this. My baby isn't turning over. I attempted to jump start it, thinking it was the battery, and it backfired and later turned off on her own. Any recommendations on what I should do?
Where you pour the seafoam?
cool
you need to probably sync your carburetors with a man-ometer
Get yourself some Marine outboard TCW3 rated oil and add it at 1 oz per 5 gallons of gas. Add it every time you get gas. Most large parts store sell it. That bike will purr.
Vacuum leak or just being too rich. Usually backfire popping is running rich. Do you get that muscle car gassy exhaust smell and how do the pipes look? Sooty at all?
MarkusReese I'm not sure what you mean by 'muscle car gassy exhaust smell' but I could smell unburnt fuel while it's idling. Also, I'm not sure where to look for the soot... do I check at the end of the exhaust or the headers?
MarkusReese So I did a vacuum leak test today using both propane and WD40 methods. After having the bike idle steadily for 10 minutes I put the unlit propane torch against the boots and the there was no change in idle speed. Same with the WD40. So my next check is air/fuel mixture. I'll read your instructions again in the other vid.
sitting in the bowl doesnt work! the problem with carbs are clogged fuel ports that need cleaning.. run it through the tank!
Same steps on a 250 ?
Can anybody tell me how long does it take for gas to gum up. I just bought a bike Suzuki Boulevard s40 and it only runs when the choke is out. Bike sat for 2 years outside under a m/c cover. I'm thinking of trying Seafoam.
Cruiser007 hey, I got s40 also and It was sitting for awhile in the garage. I had the same problem. It was idling poor and misfiring. I changed the sparkplug and cleaned the air filter but still, it ran poorely. Did you try the seafoam? If it worked, let me know. Caise I was thinking about taking the carb apart and cleaning it
....fwiw...my lawnmover carb would gum-up after a winter with the bronze gas we have...then not start....seafoam fixes
@@ih5508 I sold my motorcycle & got a 16ft fishing boat with a 20hp Honda motor. If I let it sit for more than 2 weeks it gets gummed up. I guess some carburetors have smaller jets.
Should check the vacuum leak first as it is the easier to fix
Guzel olmus.
Your Hesitation is likely that Fuel filter ...... Your running Gravity feed. That filter maybe restricting fuel flow.
there are clear filters so you can see what is going on .
I'd find one of those.
Also if you suspect Plug Fouling Change Them !
New plugs are Dirt cheap .
yeah that is a filter for a mower and will likely not flow enough for that engine. i use one of those metal inline filters on my kawasaki 454 that you used to see on automobiles when they had carburetors.
This maybe a stupid question but why didn't you just put equal measures of Seafoam and fuel on a low tank (with say 1L of fuel or less) and just run that mixture through until you needed to fill up the tank?
Surely that would have been much easier with no tools required!!
Because if there is nasty stuff in the tank it would clean that out and where would that nasty stuff go???? That's right into the carb
@@brett7794 I'm fairly sure it should have a fuel strainer (filter).
hmmm i ride a sport bike but it is still carburated....i dump a whole bottle of seafoam in and get on the high way and open her up....granted my bike is shit under 4k because it was made for racing but it does still help....but you also might want to buy a carb sync tool and sync them....only takes about 20 minutes to do and boy your bike will feel like an entirely NEW machine
Pilot jets for low rpm issues
i was expecting a lot of white smoke! thanks anyways
ty for the video .. the sunglasses inside etc .. why ? .. you clearly dont need it since we where here for the info
this product is not available in india so how to clean without Seform
akshay kherde , Order it on EBay or Amazon.
Will it work on atv
Yes Atv engines are the same just smaller well most of them.
Accelerator pump might be going bad
ChienNSusie Wang Thanks for the advice. I will look into the accelerator pump as well when I attempt to fix it this season.
Needle vavle adjustment
Why didnt you just use Redex every time that you fill up. Thats what I do on my CB 250 and it runs perfectly
Glass is a terrible container for gasoline because it collects static electricity. Big batta boom
SEA FOAM DESTROYED MY ENGINE i have the before and after help
Disable your AIS, (Air Induction System) Your bike will run 100% better overall, and is the main reason your getting that annoying back fire in low RPMs. Burning leftover fuel.
+Michael Stubbs Thanks for chiming in. How do I disable the AIS?
I'm not sure on a Honda. TH-cam should have some know how though.
+Michael Stubbs Disabling air induction completely will turn your bike into a paperweight. WTF? fuel needs air to explode?
last time used seafoam motor blew
"Miller Gasoline the champage of bottled fuel" pick some up today and share with friends
And look up sea foams TH-cam they will tell you that the more you add the better it cleans and it won't hurt your motor in any way shape or form and it won't fuck with ur spark plugs
It deffo will foul your plugs used it on several bikes and each time i either had clean the plugs or replace them.
Sunglasses in a poorly lit garage. I've seen enough, thanks.
the attempt to use "big " words was funny as hell
Sounds like your main jets are clogged
lol why didn't you just mix it directly into fuel instead of having to go through the whole process of draining funnelling etc
+Nolan Orvold I wanted a high concentration of Seafoam in the carburetor bowls. Even if I emptied the entire bottle of Seafoam in the fuel tank, the 10 litres of fuel in it would dilute it. I hope that explains it.
+BrownBrady hmm I understand but I think it's a little overkill ahah but I see your point
I added it to my fuel tank but first siphoned the gas out.
Nolan, he brielf mentioned that he let the bike sit for 24 hours after filling the carbs with 100% seafoam, which was the key part. After letting the bike stall running 50-50 mix, he filled the carb with pure Seafoam and let it sit overnight. If you just dumped seafoam into the tank, it would not achieve as much cleaning as the method in the video, as the mixture sitting in the carbs would not be pure.
Alternatively you could drain the gas tank instead of the carbs, and fill the tank with pure Seafoam, start the bike and let it run till it consumes all the gas left in the carbs and eventually is only left with pure Seafoam in the carbs, at which point it will stall. Then let it sit overnight, then drain the carbs of the seafoam in the morning and refill the tank with gas. If you don't have a prime setting on your petcock though, could be tricky getting gas into the carbs with gravity alone (there are plenty of funny videos of guys blowing into their gas tank to force gas down).
So it depends on if you think it's easier to drain the carbs twice, or the gas tank once and the carbs once? If you're uneasy about disconnecting the fuel line and funneling, and you have an empty gas can, you can use the gas tank method as well.
It cleans the bowls and the fuel rail....a very good way to ungum from inside without doing a carb clean.
It's 1 Oz per gallon. I use 4 Oz in 4 gallons.
That’s not the best way, just put the correct amount in the tank and fill and ride it ... this way isn’t doing anything more or better
Marvel Mystery Oil.!!!! Use it in the fuel tank. Do not put it in the crankcase oil.!!!!
Thanks for the tip!
Fuel is stored in the balls ✍🏻✍🏻✍🏻
Clean your carb
seafoam got your money.......
Seafoam does work but it has its good points and its bad points.!! It's over 40 year old technology it was invented for two stroke outboard boat motors that had a lot of carbon and oil build up on the Pistons and combustion Chambers !!!!!
I didn't know that. Thanks for the info.
What's the bad points? I'm trying to workout if I should use it. My carbs are spotless had them off last weekend, but I'm seeing photos of very clean values and I want some of that without taking apart the engine.
Your making that way too hard on yourself. When you're at a third of the tank, add a whole can of seafoam. Start it up 2 mins. Let sit whatever time u want. Then go for a 20+mile ride giving it hard acceleration from time to time. Go fill up gas tank with fresh gas. And use lucas fuel injector and upper cylinder cleaner every other fill up. Never have an issue again.
That's not how you use seafoam!
Cho Mo much?
Don't go doing dumb shit like this a poor little more than recommended in your fuel tank and that'll do the job it will not harm anything
throw the stuff away. Save your money. Snake oil.
terrible video
That bike is too old get u another newer bike