So the previous owner replaced the stock carbs with a set of CV34's off an KZ1000 police bike. It's a '78 LTD, but the motor is a '76 KZ900 that was supposedly rebuilt. Any internal mods are unknown. The carbs are running K&N Pods, and exhaust is a Delkavic running the outer glasspack only (no inner baffle tube). Previous owner claimed that the jets were stock to the carbs, the only thing he did was snyc them, and shim the needles. Since getting the bike back on the road I have adjusted the idle screws. Ignition was recently changed to dyna S, with Accel Coils. I initially had a plug wire/coil arcing to the frame due to lack of proper boots. (I actually used a 1/2 inch section of vacuum line as spacers as the old boots were too big for the coil, not thinking that vacuum line is conductive). I've now installed new boots and terminals, as well as lowering plug gap from .045 to .035. I believe the ignition to be sorted.
Current performance: Bike starts on half choke, and I usually turn the choke off after 1/8 of a mile. Not cold blooded at all. Idle is smooth. Bike runs well as long I as ease onto the throttle. Anything more than 1/3 throttle at 2k rpm leads to a sputtering/break up condition. Seems to clear up about 5k rpm and takes off! From what I read on CV carbs and pods, as well as issues using CV carbs on older bikes, I think this an issue with the needle taper/lift.
I do not know if an airbox would be practical in this situation. The stock airbox would not fit the larger carbs without modification, and a later airbox may not fit my frame. A Dynojet kit is said to mask most issues arising from pods on a CV carb, but would not necessarily provide the metering needed for the 900. I've read that CV34 carbs from a GPZ750 are a better match. Would it be possible or advisable to used a Dnyojet kit designed for the 750 in the police carbs?
I did receive the old vm26 carbs along with the bike original motor (in multiple boxes). I know that these are supposed to be easier to tune, and I don't think I would be giving up a lot of performance. The condition is unknown. Converting back to the VM's would cost more than a Dynojet kit. $70 carb holders, $80 rebuild kits, $30 new throttle cables, and whatever the different size pods cost.
So what would the best approach be? I'm looking for good driveability and throttle response. Don't care much about picking up a few extra horsepower at redline.
1978 KZ1000B LTD w/KZ900 engine
