Putting Carbs Back together. . .

I've been messing around with my carbs for the last 6 months trying to get my bike to run. They have been thoroughly cleaned and the bike will start but not run. I've taken the carbs (i call them CRABS now) off and was trying to bench synch them with some of the great "how to"s on this website.

I found out that the bar that holds the idle adjustment screw and supports the carbs causes my butterflies on my carbs not to "snap" back and forth. They become very very stiff if that bar is mounted and tighted down. If i loosen it or take it off the butterflies work fine.

Anyone else had this problem? Better yet anyone have a solution?

 

If you took the carbs completely apart (broke the carb rack apart) then the sympton that you describe is due to the carbs not being laid on a perfectly flat surface during the re-assembly process, and one (or more) of the carbs is out-of-aligment within the rack----that's why loosening the rack screws (which relieves the out-of-alignment condition) allows the butterflys to open and close properly.

I would suggest loosening both the upper and lower rack bar screws (don't have to remove them, just loosen them fully) and then put the carbs with the air cleaner side "down" onto the perfectly flat surface. Helps to put a little pressure on them to make sure that they stay in perfect alignment....maybe a short length of 2x4 across the top throats that you can hold pressure against. Then one-by-one snug up the lower bar retaining screws, doing the end screws first and working your way inwards. Get them increasing snugged down before starting ont he upper rack screws, and tighten them in the same manner.....one at a time, outside carbs inwards. Now, put the rack back down on the flat surface, and loosen and then re-tighten the lower rack screws tightly, and then do the others for the final time.

BTW, it helps if you have an extra set of hands available while you're doing this, it only takes a minute or two to accomplish.

I recommend some anti-seize compound on all of the rack screws AND semi-permanent Loctite.

This should solve the binding problem. If not, there may be binding in the linkages or the butterfly valves if they weren't re-assembled correctly.

 

take a look at the springs on the synch screws, the thicker one goes by the screw head