Was running good but left cylinder stopped running

[Joeschwab]

Yes pulled the reed they look good no cracks or breaks

[Bennett131]

Yes pulled the reed they look good no cracks or breaks

Can you see gaps through them? Did you screw the plug boots off and cut 1/4 inch off of them?

[Joeschwab]

No gaps and no I did not because if it was a spark plug wire issue it would flip if I swapped the wired

[sleeper06]

#1 pressure test on brand new motor

#2 another compression test listing both cylinders

A few things that pop rite out at it me is ported on 300 mains and 16cc domes. Are you running race fuel? What does the plugs look like? Who ported the cylinders? Have you tried swapping carbs? I have a cpl theories but would like above test results. I've had a bad flywheel cause similar shit once

[Joeschwab]

Did pressure test it is good compression in both cylinders is 150 porting was done buy Duncan racing I'm running race fuel haven't been able to do a plug chop hasn't ran long enough to I haven't tied swapping the carbs

[sleeper06]

So it held 6lbs for 6 minutes?

[Joeschwab]

Yes it did

[sleeper06]

300 main sounds lean for a Duncan motor.

[Joeschwab]

I am in colorado but if it was lean wouldn't that affect both cylinders

[sleeper06]

What's ur elevation

[Joeschwab]

5000 ft

[sleeper06]

That's high jetting isn't thag off , well you covered everything mechanically , see if you can try s diffrent flywheel and try swapping carbs to rule out fuel

[Joeschwab]

Okay I have another banshee that I know runs I'll try the flywheel and if that dosent work I'll swap carbs

[Joeschwab]

Okay so I found a air leak on one if the intakes I got that fixed no it run good up high and when review really quick but when I hole it at about 1/2 throttle the left side stops running

[Joeschwab]

Also when just review from idle it puffs smoke out left pipe and not right