YAMAHA 15 HP 2 STROKE, " NO POWER "
ฝัง
- เผยแพร่เมื่อ 4 ต.ค. 2024
- Yamaha 15 hp 2 stroke....... This old outboard is being a pain 4 sure. Motor seems 2 run well until put on a boat & under a load ? Well lets dive inside this problem outboard & see what we can or cannot find. Come along for the ride....... kodi
Looking forward to seeing what the problem is. You'll figure it out. Hope you do a on the water test again. Very interested to see the outcome. Thought I seen Tennessee and Chumley out there sun bathing
I hope I can find the problem, stay tuned. lol kodi
I've seen this on some other 63v series 9.9/15s. Not sure the exact cause but the motor was running rich. Tried 3 different good carbs and still rich. I dropped the main jet size to a 98 (676-14943-26-00 Yamaha or 3B2032510 Tohatsu) and it ran good and the plugs looked good. Worth a shot maybe.
Sounds like a good idea to me also
Stay tuned carb is next area to explore, kodi
I had the EXACT same problem with my 15hp Mariner. One shop couldn't figure it out, the other shop said the butterfly valve was just not opening 100%. They made it to where the valve was opening completely, and voila! Fixed it. I guess the throttle cable was slipped a little.
i had a motor that did the same thing...turned out to be a carbon build up with the rings...one can of powertune fixed it...good luck to you....always good to watch your videos!
I am close to pulling the head to sniff around in there, stay tuned... kodi
It’s one of three things, 1) fuel, 2)air, 3)spark. So far the spark is good, check the fuel, and then check the air. Let me add, Yamaha has a great additive call “Ring Free” I use this in my Yamaha 15 hp and the tops of the pistons are mirror finish. I would highly suggest using this
Maybe a bug crawled in there where you plug in the fuel connector to the motor and not sucking enough fuel under load....yep that’s a puzzler, enjoyed the ride along on the water anyhow thanks again!!! 🙂 👍🏻👍🏻
I think it is looking me in the face, Just to blind 2 see it.. ug. kodi
Nice 13 Whaler! I am restoring a 1966 right now. Even if the hull is waterlogged a 15 should get you up on plane fine.
Ignition timing okay? I was thinking correct prop selection also but I see that has already been mentioned. Thanks for the brain teasers, I like your video's a lot, keep them coming.
Good thought indeed...It kinda looked like one of the prop blades was bent up, but that might be just a video illusion...But, proper pitch should be checked..
My thoughts are that it’s getting water into the combination chamber possibly from the exhaust baffle. How I have found that before is run it at WOT and hit the stop button and pull the spark plugs and look for water droplets.
I'm liking this idea, but would think it would seize up after using and sitting. But who knows, surely easy enough to check plugs for water...
I ran it until hot without the lower unit on... No L/U no water to the cylinders.. Ran the same. kodi
@@kodibassInsideoutboards Well that’s interesting. I guess my next step would be to see if the timing is going out of wack, What I found interesting is that in the video you can hear that it is on both cylinders off idle and when you give it throttle it goes bad, I think I would make a mark on the flywheel and check with a timing light to see if it is advancing correctly or if it goes retarded, I am more of an OMC guy but I have seen OMC powerpacks do weird things with timing before.
@@kodibassInsideoutboards Yeah, the water in cylinders was a long shot....
I put a 25HP 1969 Evinrude on a heavy 13FT clone like your whaler years ago and it wasnt water soaked and it barely planed with two people. If your boat is water soaked thats a good reason. You could of tied the boat realtight before leaving at the dock and did a full throttle check to see if it ran like in your tank or even better not moving to confirm .Anyway another possibility is severe carbon blockage in the upper exhaust exit area. Friend of mine had a 1970S 25HP Evinrude that just one finger would fit thru the upper block exhaust port area and the motor had no power too until he cleaned the blockage of carbon out .Hope this might help ....GP
I will check that soon 4 sure. kodi
Just revised my Mercury 60hp link and sync video. There was a lack of video's on this so I decided to do my own with pictures too. Doing a timing one here soon on the beast. Love this motor👍
Good job, I want to get @ that 3 cylinder 50 I have soon. Weather still has been a bit unkind tho. kodi
2021
We appreciate your content and expertise.
Great presentation.
Keep smiling buddy.
Cheers.
London UK.
Always Great to hear from across the big pond! Thanks for the kind words & watching mate. kodi
Thanks it did help to see it. It looks very simple to do.
Yepper, kodi
Hi. Love your channel. Is there a way to upgrade the power of my 2009 Yam 15hp 2 stroke? Many thanks...
Depends on your level of skill, Enlarging ports, installing higher performance reeds & other parts. Yes it is possible but not cheap. kb
Hi. I won't do any porting but would fitting high performance reeds and stuffers be worthwhile in your opinion. Many thanks. Love watching u work... jj
Hey Kodi that one is a pita.
Remove the gearbox, and check the exhaust. Sometimes people use to much oil on the mix or not the right oil, and the exhaust gets clogged with carbon. Instead of a 2 inch exhaust, it gets clogged and its turns to leda than a inch diâmetro exhaust. Happen to me a few Times, specially on engines that work a lot on idle.
Yep' checked all but the side port, maybe that next. kodi
I don't know if you checked the throttle plate position at WOT. When you were reving the motor in the tank it looked like the throttle was not opening all the way. On the boat the motor sounded overloaded to me like too much pitch on the prop. It doesn't sound like it was starving for fuel either. Check that wide open throttle and check the carb silencer for dibris or mouse nest maybe. Have you been inside the carburetor? Gonna be watching for the solution. Dave
will do. kodi
You've got a real head scratcher there. Did you try it with the hood (bonnet) off when at sea? Could it be sucking its own exhaust gas somehow?
Hood off or on seems the same.. ug kodi
Kodi, you need to call the owner and have him describe what happened. If he was running at WOT and all was well, then it bogged down ("his words?") then I believe it's a fuel delivery issue in the carb linkage. On your test runs the motor never made that WOT sound. Don't
know a thing about "Yammies" just my 2 cents worth. I agree with a previous comment.
Carb isn't opening up 100%
I agree it sounded like poo @ wot. kodi
It runs well on idle! Starts well too.
But it runs like a wet rag 🤗 in wot.
Check timing in wot!
Will do, stay tuned...... kodi
That's a tough one! I'm not the geru u r, but I would check out the fly wheel key, just a thought, it could be flopping around 🤔
Stay tuned I will 4 sure look @ the key. kodi
My not so educated sggestions would be to test performance using the same fuel line in the tank and on the boat, then swirch the fuel pump, make sure the motorhead's exhaust passages are clear and check the reeds for fatigue. Maybe look for Yamaha service bulletins ?
All good possibilities 4 sure. kodi
@@kodibassInsideoutboards Please don't let us hanging like that . Work your usual magic !
seems to me the needle and seat are sticking need replace or something of that matter flooding it out just a little bit.
Just pulled the carby. kodi
Some people call them "Gramma-ha's" lol
Might be an optical cullusion, that prop looks like it has a lot of pitch.
I thought I saw something like this also, almost like one of the blades was bent/twisted...
Wonder how it sounds with gearcase off, not submerged. Loud and cracking or muffled. Maybe ex ports closed up?
@@alberthafner2194 It's possible, perhaps the owner has been using crummy oil, idling alot, or the engine is running cold...It would be nice to have one of those plumbing inspection snake lights/scope to fish up the exhaust housing and into the exhaust manifold...
Your motor looks to low. The cavitation plate should be the same height as the bottom of your transom. Try changing prop pitch also.
It may be drawing air on the carb gasket?
Hmmm. Not a Yamaha guy, but compression and spark seem OK...The inline tester seemed like it was indicating a miss, but there was no audible signs of an ignition miss...So, just the testers I guess. Engine seemed to perform identically when run on either cylinder by itself. Again, not a Yammy guy, so will ask you if the engine appeared to idle normally at idle speed settings, kind of seemed like it did. I was thinking exhaust blockage also, but you seem to have eliminated that possibility. Running the engine in the tank with no load/no prop can be deceiving, so I won't conclude much from that test. I like Phillip's idea about ignition timing, but it appeared as though the timer base was moving freely.... Perhaps the flywheel key is sheared, but then I would have thought the engine wouldn't idle worth a damn.... Perhaps there is a rag/junk caught in the air box, causing what seems like rich running at WOT. Don't know anything about Yammy carbs, but perhaps it is too rich somehow at high speeds. Kinda like a missing nozzle gasket on a little OMC carb. I would say perhaps the fuel pump is flooding a cylinder, but that doesn't seem to follow the running characteristics of the engine. This thing has a choke, no primer, correct? If it had a primer, I might suspect a primer issue causing rich running. I suppose the choke linkage could be messed up keeping the choke from opening fully, but that seems like another long shot. Is the carb butterfly opening all the way, perhaps the sync linkage is messed up. Maybe you could try running the engine in the tank with the prop, then pulling the fuel line to see if it cleans up as fuel pressure disappears. Whatever the issue is, seems to affect both cylinders equally, but the engine seems to idle OK...Perhaps a water leak into both cylinders, that seems like a long shot though, engine would probably seize up after running/sitting.
Will "stay tuned"!
If it was water in cylinder issue I would think when I tested it without L/U it would have run correctly. I have a few test to check out yet.. Carb-exhaust side ports-wiring-linkage etc. kodi
Hi kodi, iam sure you have all ready tried this. Can the issue be bad gas?
I used new gas fresh that morning, mixed 50-1 with Yama-lube TC-w3 2 cycle oil. kodi
Hi Kodi, in your opinion: Yamaha 15 hp 1992 or Evinrude 15 hp 1998 in the same condition. What do you think about it ? what is better ? Thanks in advance .
In that situation I would go with which parts motor is more popular in your area. kodi
wrong high spead jetting,sounds like, wrong carb unit,and faulty lower unit(Pine tar on the Bat)??????????
Very odd ? It didn’t seem like it had the high rev as a 2 stoke .
Yep' no top end whine... kodi
How about power pack?
Not reaching peak Revs my yam 8hp two stroke make more power but reaches peak revs easily has hi thrust prop
Wrong prop ?
checking 4 sure. kodi
It has a carb with restricter in it ? From another restricted model ?
Heck it mite not even B the correct carb... kodi
I had a 2.5 and 3.5ho Tohatsu 2 stroke when putting them back after cleaning carb 2.5 had big washer blocking throat removed it now had two 3.5 go outboarf one with FN one with straight drive...
This is what I think lol. The spark isn't firing fast enough. Evan at wot it's still slow spark
Thats what it seems like to me also , still tinkering with it, kodi
I have a 15 hp four stroke and it runs like a gorilla chasing the last banana in the rain forest.
Swap out the carb,, maybe running to rich
Sounds like the reed valves.
A reed valve problem would not allow the motor to even start.
Weak reed would let it start fine but would flutter at high Rs.
@@jonhutchens9770 stay tuned 4 sure' kodi
check head gasket if water gets on one of the plugs it will do this !
Yep' I will inspect that 4 sure. kodi
@@kodibassInsideoutboards keep us posted
Put a new power pack on it will solve your problem
Hey bud what would cause 1 to hiccup at idle it the best way I can explain it lol
normally it is running lean that will cause this. kodi
@@kodibassInsideoutboards hey yeah bud I got T.O.O to say the same thing lol yall 2 are the 1s I watch all the time haha. Thx for the reply ima try and work on it some more tomorrow afternoon. See what happens.
prop pitch correct
I am looking into it. kodi