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Starting the 125cc

Notallthere
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Notallthere Apprentice

Notallthere

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Hi all

I am pulling my last bit of hair out with this little GY6 125cc atv. Is there a decompressor on start up ? I put a new starter on and with the spark plug out and the battery direct to the starter it spins over a treat, but spark plug in it pulses or does not turn over at all. Please any help

Mech Grand Master

Mech

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Posted

Have you tried turning it over on/by the crankshaft with the plug in ? Perhaps it's got too much compression, or perhaps the piston's hitting the sparkplug.

Have you tried watching the voltage while it's cranking over ? Perhaps it needs a better/bigger battery.

Notallthere Apprentice

Notallthere

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Hi Yes tried the fully charged car battery and had the head off with no damage to see. It does act as to much compression it's at 120psi and the crank is free and easy to rotate. I know that some engines have a auto decompresser on start up ? I have been looking for what to set the tappets to because all the same engines have a different gaps.

Cheers

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