Hey guys I got a 1981 cb650, I was wondering if anyone on here has any expirience with rebuilding carbs. I have no prior expirience with them and was wondering if it was something i could do myself. Also how hard is it to mess up a carb when trying to rebuild them.

Also does any one know about dynojet carb kits, are they for rebuilding or just for performance. http://www.dynojet.com/

tia

 

You can rebuild a carb pretty easily if you are mechanically inclined. just keep track of the needle positions and check if the floats are saturated. you will need to synchronize them afterwards... you can do this yourself with a mercury based tool or you can take it to a shop and have them do it. I don't know about the dynojet sytem these days, but in the old days they were for perfromance upgrades... and DO NOT drill out you slide.

 

Carbs are not that hard to work with. If you can get a manual for your bike and it should show a break down of the carbs. Oem is the best, haynes/clymer kinda suck when it comes to needing great details.

Dynojet jet kits generally have replacement needles with adjustable height (via c-clip), and main jets. They are more for tuning and not rebuilding.

IF they make em for your bike, get a factory pro kit. They are a better product, and usually provide stiffer vacuum slide springs to replace the oem ones.

You may want to look into a rebuild kit. The float bowl seal is probably dry rotted. The floats may be old/brittle. Also look into the float plunger mechanism. The ones on my f3 had a rubber tip on them and they would wear at the contact point and would cause sealing problems.

Also once you have em rebuilt it will be nearly impossible to tune the 4pack of carbs unless you have mercury/pressure gauges to synch the vacuum levels.

Good luck.

Steven