Backfire while attempting to start.
Thank you but I have figured it out, the throttle cable itself was adjusted incorrectly. And I should've said that I turned the idle adjust all the way out and that it didn't do anything. My bad. It's running pretty good now and for the first time since I put the turbo on, the cooling system is holding pressure. I'm pretty sure that this was the reason the previous motor blew. And for anyone who felt bad about the motor that blew up, don't worry, it had almost 40k on it and was used as a stunt bike most of it's life so it was on its way out anyway.
It's all back together and running great, no more stalling at idle. Thank you all for the suggestion/help. Now I just need to put a heavy duty clutch in to handle the extra power. If anyone knows a good clutch to get, please let me know.
well, it has started running rough again. its worse this time. I've just tried replacing the spark plugs and battery, the plugs were not iridium but copper and the battery would only crank the bike for about 2-3 seconds, replacing these seems like it made it worse but i think it just got worse on its own. I just ordered a full rebuild kit for the carbs, im hoping its just that float needle that's letting to much fuel into the bowl.
the way its running right now, it will start just fine but it doesn't fire on all four consistently, if you rev the bike past 4k all cylinders will fire without fail, but anything under that and it completely drops 1 cylinder and fires about 80% of the time on another, the other two don't drop out at all. ive checked for vacuum leaks, fuel leaks and ive synced the carbs. while im waiting on parts to rebuild the carbs if you have any clue as to what else could cause it, please let me know. thank you.
the way its running right now, it will start just fine but it doesn't fire on all four consistently, if you rev the bike past 4k all cylinders will fire without fail, but anything under that and it completely drops 1 cylinder and fires about 80% of the time on another, the other two don't drop out at all. ive checked for vacuum leaks, fuel leaks and ive synced the carbs. while im waiting on parts to rebuild the carbs if you have any clue as to what else could cause it, please let me know. thank you.
its not a fuel delivery issue, it gets enough fuel. im thinking its one of the float needles letting to much fuel in. hopefully this rebuild kit fixes that. and it currently does not have an inline fuel filter, i plan on getting one though.
Well... Don't buy cheap coils. That was the problem this entire time. A coil is bad and was causing the miss. I unplugged it and although it was only running on three cylinders, the miss was gone. Moved the coil and the problem followed. Oh and don't build your charge pipes out of PVC pipe. It will work for a little while but eventually will deform and cause massive boost leaks. I'll be building it out of metal soon enough. Hopfully with new coils all the engine problems will go away but I have a feeling something is gonna pop up. I'll let you all know when I get the new coils. Fingers crossed.


