How To Sync Carbs Honda CBR900RR Fireblade Motorcycle | Balancing Four Carbs With One Gauge | 010
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- เผยแพร่เมื่อ 13 ก.พ. 2022
- How To Sync Carbs Honda CBR900RR Fireblade Motorcycle | Balancing Carbs With One Gauge | 010
In this episode I balance the carbs on my Honda CBR900RR project bike. I am doing a full service on this bike and I have set the valve clearances as well as all of the other usual service items first.
Aquarium airline 4 way splitter valve: ebay.us/2XS9v3
Single carb dial gauge: ebay.us/j0s1Ag
4 cylinder manometer: ebay.us/lxrvuA
I discovered that my trusty 4 column mercury manometer I'd had for balancing carbs for many years wasn’t working properly. This was because at some point it seems that some of the mercury has gone missing. And there was not enough of it to work on all four columns of the manometer.
At first I thought I would need to buy a new one, but then I remembered a technique that I had seen where you can use one gauge. This required buying a simple piece of equipment which could be available from a local pet shop.
I had seen this done with a dial gauge before, mainly to avoid the calibration problem with multiple dial gauge setups. I thought that as my manometer had sufficient mercury to use one of the columns that I could use the same technique.
I purchased the appropriate 5 way air distribution block, and plumbed my gauge so that it could be switched between any of the four cylinders. I then went through the process to make sure that all of the carbs read the same.
Cylinder number 3 is the master cylinder, and the others are adjusted to match this. I had to go through the process a couple of times to get them all the same. When I say the same I mean within spitting distance of each other. Every time you blip the throttle they change slightly, the trick is to get them all as near as possible.
Once I had done, the throttle response does seem to be a hell of a lot crisper. I can’t wait to get out on this Fireblade project bike.
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Brilliant tip, thanks. I have just found your channel and having watched a couple of uploads, subscribed. I look forward to playing catch up as I have a 96 blade. Thanks 👍
I am sat looking at the rain (its the end of April) pining to get out on my 'blade. Hope you enjoy the other videos.
@@SPANNERRASH thanks, I will. I keep thinking about selling the blade as arthritis means I seldom ride it, sometimes I decide it has to go, then I open the garage door and one look at it, changes my mind.
Hey thank you for this video and others! Middle of first time balancing carbs and your video really explained it well! I got fuel tap rebuild kit and messed up badly 😁 got distaracted and forgot how it goes back together heh. Any ideas for picture or should i just slap it back somehow.
Mine is 900rr from 97
Sorry I haven't played with the fuel tap on mine, but try looking at the diagrams on CMSNL, they may help,
@@SPANNERRASH aah yeah they dont have pictures of install order of spring and rubber parts.. damn next time im going to take pictures ha!
What a great idea! I've been wanting to sync the carbs on my Nighthawk cafe racer. I've noticed that when I rev the engine it seems to "hang" slightly going back to idle when I let off the throttle. Do you think syncing them would help correct that little issue? Thanks again for your videos.
Thanks mate, and sounds like it could help, but I'd definitely check the cables first. Then I'd see if you have any vacuum leaks around the carb rubbers. Although you should do that before syncing the carbs anyway. :)
@@SPANNERRASH Thank you very much!!
👍
Probably somebody just moved them in the past. The petcock vacuum line just needs to come from the inlet tract after the carbs, any of the ones used for carb ballancing is fine. Maybe a PO just found it easier like that. I wouldn't overthink it :)
As soon as I seen the Mercury sticks I knew you knew what you were doing. There's some clown on another TH-cam channel messing with the carburetors he has no clue what he's doing 🤣😂🤣😂😂😂😂
I have had them for a long time. I'm a bit annoyed that they are short of mercury now, and I am struggling to find somewhere to buy some. Thanks for not thinking I am the clown :)
What's the standard butterfly opening for these carbs? I'm trying to fit a set of cbr900rr keihins on a vw 1300cc engine of a breadvan.
Sorry I can't help you with that.. Sounds like an amazing project.
Hi there I can't remember? Did you ever give a guide how to apply for historic motorcycle tax and not exemption, kind regard Dave, keep up the good work
Hi, you need to fill in a V112 for the MOT exemption, here is a write up about it www.spannerrash.com/v112-form-mot-exemption/ . For the Historic tax change you can take your V5 into a post office and they will send it in for you. You can probably do it by post too, but I find it easier to get the post office to send it off. Hope it goes smoothly for you.
@@SPANNERRASH thanks a lot that's brilliant CB 750 Dohc 1981 41 years old, but still haven't got the carbs idle circuit set up this is such a pain kind regards Dave
@@kimsmith4409 I've never played with a DOHC one, however guitar strings really help to clear pilot jet airways if you need to do that.
Your vacuume line on yours is capped on mine and my vacuume line is on the left side that goes to my petcock why would this be
As long as the vacuum is connected, it can be to any of the ballancing take off points. Maybe a PO just found it more convenient to move it.
@SPANNERRASH thank you for your reply I have my carbs sync all the same idles nice and revs all the way while in neutral,but when I ride its fine and when I get to motorway speed and open my throttle up it seems to bog down and sounds like a clipping nosie from the exhaust even though its no were near redline and won't give me any more power
@@jonny-p-8927 Assuming it isn't an electrical gremlin. I would look for any air leaks anywhere on the intake. Especially if there is an emissions pipework. Faults like this can be really hard to trace. Good luck! 🤞
@SPANNERRASH I found the problem I handt screwed the mainjet in properly and found it when I striped my carbs again in bottom of carb1 float bowl 🤣🤣