Hello all, have a question regards to trouble shooting my mikuni 22mm. My engine specs are as follows:
212 predator
14cc head with .040 HG
champion rockers
22lb springs
+.020 rod
mod 2 cam
mikuni 22mm with long intake
billet flywheel
The thing lights up the tires and sounds ridiculous all the way through WFO up until just about max rpm and then drops off slightly, picks back up, and drops off again. Dont necessarily want to call it "surging" but rather a quick lapse of power then picks back up. Have the 130 main and 12.5 pilot installed. This was sent to me with the carb and I know it is a recommended setup, but I'd like to know opinions on which direction to go to try and figure out whats happening at WFO at the top of the rpm range? jet needle is in the top most (leanest) position as that made it run the best. moved the clip down and got worse. Moved it all the way up and turned the screw on the side out more and got even better. I know we need to do some more adjustments on the jet just dont know where. Im thinking that we need to go up to a 135 or 140 main and then fine tune the needle and air screw? im thinking it needs some more fuel at top rpms, but im no expert.
Also, just put some new 22lb springs, so im not certain its valve float but im not ruling out heavier springs. Any help would be greatly appreciated.
212 predator
14cc head with .040 HG
champion rockers
22lb springs
+.020 rod
mod 2 cam
mikuni 22mm with long intake
billet flywheel
The thing lights up the tires and sounds ridiculous all the way through WFO up until just about max rpm and then drops off slightly, picks back up, and drops off again. Dont necessarily want to call it "surging" but rather a quick lapse of power then picks back up. Have the 130 main and 12.5 pilot installed. This was sent to me with the carb and I know it is a recommended setup, but I'd like to know opinions on which direction to go to try and figure out whats happening at WFO at the top of the rpm range? jet needle is in the top most (leanest) position as that made it run the best. moved the clip down and got worse. Moved it all the way up and turned the screw on the side out more and got even better. I know we need to do some more adjustments on the jet just dont know where. Im thinking that we need to go up to a 135 or 140 main and then fine tune the needle and air screw? im thinking it needs some more fuel at top rpms, but im no expert.
Also, just put some new 22lb springs, so im not certain its valve float but im not ruling out heavier springs. Any help would be greatly appreciated.
