Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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What is the model of this engine? Normally intake and exhaust sets at 0.005, but may change due to model number.
Timing is set by gapping the coil against the magnet side of the flywheel. use a business card to place between the flywheel and coil with coil loose. let the magnets in flywheel pull coil against the card and retighten the coil down.
Valve Clearance for a 540cc or 21hp engine is 0.004-0.006
Ignition coil gap is 0.010
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