Help needed. 81 KZ650-D4 w 81 KZ750-4 (Wiensco 810 big bore) engine & VM24

KZB2 650 wrote: While waiting for the new petcock you could cap off the vac port on #2 carb and the petcock and run the petcock on the mid position "prime" to get fuel flow. Since you have new plug wires and its 2 and 4 cyl that too rich (2 and 4 cyl run off of different coils) there is a good chance the coils and wires are ok.

I see you painted the carbs....... I'm leaning towards a partly plugged channel in the carbs for the choke, pilot or air. Nessium is big on soaking them in carb dip after removing everything along with o rings and see if you can search for Patton's procedure on holding certain air passages while blowing through others (with high pressure ) to get more force through them. You will probably need a strong compressor and not just the spray from a can of carb cleaner.

I know you've done this and its a lot of work and I hate to be wrong but I'm thinking things are pointing in that direction still. Hoping OTHERS will chime in on the idea. Baldy runs a 810 kit with a step bigger cam and head (GPZ) and runs a #15 pilot ..... do you have this size (stock) that would have came with em for the 650. Always seemed to lean for me but he swears by em. Not sure about trying this just a idea.

SWest wrote: I'd check the H/T leads coming from the coils. Might be a bad connection on those two.
Steve

KZB2 650 wrote: Too high of a float level could cause this and you should be able to clean the plugs up some what..... When I fouled a couple last summer while doing the smooth bore carbs I could not get em to clean out and needed to replace em..... having read of this happening to a few others but it was a first for me over many years. Since they clean out and run good after off idle they are still probably ok to run...... did you ever try 1 and 1/4 turns out on the air screws...... that's about were they come from the factory and might give you a better starting point ??