i'd like to run this you guys on here, and see if the collective experience can help with my diagnosis.
the engine: basically, 1015 engine, stock head, stock cams, 4/1 pipe, with baffle. brand new carb to head boots.
the carbs: vm29's, UNI pod filters(oiled), 115 main jets, stock needle jets, presumed stock needle settings, 17.5 pilot jets. sync assumed to be serviceable. air screws out 1/4 turn(...)
symptoms: engine hot, will idle. go to transition from just idling to 1/8th throttle to leave light. engine bogs and stalls if i do not rev past 1/4 throttle, and on to jet/jet needle. basically, whenever i come right off of idle, i get a serious bog, then it cleans out, and it revs to redline(or when i unwind it). adjusting of air screw makes little to no difference in idle quality. neither speeds up, nor slows down. however, if i run this out to 1 and 1/2 turns out, i will get some backfiring in the exhaust.
my best guess is that i went too small on the pilot jet, especially since it clears up after 1/4 throttle is exceeded. steady-state cruising is poor as well. i have been working around it by cruising in a lower gear to keep my rpm's above part throttle.
thanks for looking everyone.
--r
Post edited by: solomrus, at: 2006/03/03 14:14