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Author Topic: backfiring?  (Read 868 times)

zx50 4life

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backfiring?
« 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.
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zx50 4life

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Re: backfiring?
« Reply #1 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
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BettinANDlosing

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Re: backfiring?
« Reply #2 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.
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2002 Kymco B&W 300; MRP 78MM "300CC", Naraku cam, Yoshimura rS3 exhaust, 17g Sliders, Yellow torque spring drilled airbox, stock carb #115 main #40 pj.

2001 "Yamaha" Zuma AKA MBK Booster; MHR OverRange, Dellorto 19mm BHBG, Polini "big" intake, RS-3 Rear shock, Stock cylinder.

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