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Scooters - 50cc => zx50 => Topic started by: zx50 4life on July 30, 2014, 05:24:29 PM

Title: backfiring?
Post by: zx50 4life on July 30, 2014, 05:24:29 PM

New big bore and crank installed,  when trying to start a loud pop comes from exhaust.  90cc kit and stroker crank from ebay, 28mm and 24mm oko carb v8 exhaust.

Title: Re: backfiring?
Post by: zx50 4life on August 03, 2014, 12:58:55 AM

Ok, I think it's the timing. I took the key off the crank and readjusted the flywheel.  It started then died out. What is the correct degree should the flywheel be set to at tdc

Title: Re: backfiring?
Post by: BettinANDlosing on August 03, 2014, 05:44:36 AM

I think you might be looking at it wrong, these flywheels aren't adjustable...... Factory timing should run the engine even with a cylinder and crank. You need to check for air leaks.