I have a 76 yamaha 360 rebuilt the carbs after sitting for years runs at idle but starts to miss after awhile i took the air boxes off and noticed that when u rev it up the slides barley flutter they wont pull up, do the air boxes have to be on for them to work correctly or am i missing something. they fill there sealed tight and holding? any help would be great
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carburetours diaphrams
- Thread starter apmarler
- Start date
Keep in mind that the CV piston won't move far if there is no load on the engine, so messing with the throttle in the garage might not show you exactly what the carb would be doing while driving.
Well the slide moves up to let more fuel in, so if you are super rich i'd start looking elsewhere
There are a few good guides on these forums for setting up the carbs, check those out and go step by step, use new plugs so you can see if you fixed the idle mixture.
My guess is there is something assembled wrong in them or there are other issues with the motor/ignition. What size jets do you have in them? Stock is 17.5 pilot and 135 main. The manual can be found in the classified section for free. Post a few pics of the bike so we can see what you are working with. Have you set the valves, check the timing, cleaned gaped points, done a compression test? Lot of thing to do on a bike that sat a while. Syncing the carbs with a manometer should be done after all the other thing have been checked.
Attachments
From time to time, we have some really bored people, and they put neat things together, like this next link, From Willem, and his "a bunch of How to's in a thread."
http://www.xs400.com/forum/showthread.php?t=10715
other wise, our standard line is suppose to be, find the manual, on top of the Garage, (sticky'ed so it will allways be number 2, on the top of the list, and above that is the Tech section, which is where Willem's thread should be, to help out people.
An excellent carb guide, http://www.amckayltd.com/carbguide.pdf
http://www.xs400.com/forum/showthread.php?t=10715
other wise, our standard line is suppose to be, find the manual, on top of the Garage, (sticky'ed so it will allways be number 2, on the top of the list, and above that is the Tech section, which is where Willem's thread should be, to help out people.
An excellent carb guide, http://www.amckayltd.com/carbguide.pdf
Finally found the problem. But carb floats had pin holes and were full of gas. Got it fixed but now my problem is no high rpm pull at about 5000 rpm the bike has a 2-1 exhaust with stock jets so I think it's leaning out. I raised the needle one clip and made it better raised it another and it was to much. Any suggestions am I on the right track? I was thinking a jet size up? Or is something else wrong
