I have a push button Leopard that ran fine when it was last run 6 months ago. When I tried starting it today with an external starter it would almost catch, but then begin to backfire. I swapped coils, stater boxes and put in a new plug. Always the same thing lots of exaust smoke, almost starting and backfiring.
The engine is getting lots of fuel and the plug sparks when removed from the engine.
What should I swap next carb & reeds or the rotor/stator? Also, what sort of damage could this backfiring cause?
Hard to say, not being there, but, have you looked at your reeds? Sounds like broke reeds. Second guess is slipped timing. I’m not the brightest crayon in the box. But that is where I would start. Good luck, let us know.
I’ve had quite a few problems with electrical and timing. I would check the rotor/stator as you’ve mentioned, but someone correct me if I’m wrong. I’ve had rotor go bad/de-magnetize which cause it not to start. I was also at the track an witnessed a stator to go bad during a race and immediately started popping and afterfiring.
You can try a few simple test before going out to purchase anything. Take off the rotor and see if it will attract anything… stick to toolbox or something (should have a good magnetic bite to it) Not sure if there is a way to measure magnetic strength of one. You can also get a multi-meter and check the output from the stator. I have my exact data output from two working stators of mine, but I have to find them on my hard drive tomorrow.. it’s 3:22am now and I’m on my phone. PM me your email and I will email the screen shot data that I have. Keep us posted with any updates or success.
Put a fresh engine on the kart and spun it over with the plug out. It sparked much faster and more consistent than the other engine. Put the plug in and the new engine ran fine.
Pulled the the crank trigger / rotor off the problem engine and the key was fine. The magnets are also strong. All that’s left is the stator. Will borrow a known good one and test on the bench before replacing.
Crap – I’m with Jim….. I just re-read your post and see that this is a push button Leopard. Sorry for wasting your time with disconnecting the ignition switch – you don’t have one – we do and it can cause similar problems.