> …..the spark plugs, I noticed one of the plug has a gap far more than the other
Gap both plugs uniformly or the engine will idle and run rough, and be hard to start. Ground an adjusted plug against the head to be sure the chosen gap creates a healthy spark, then set the second plug the same.
> …..I have been using VP Racing 50:1 Fuel….
These engines are low compression and therefore do not tend to ping, so they do not need high octane fuel or specialty blends. Regular 87-octane gasoline mixed 40:1 with Marvel Oil creates a healthy ‘bang’ and keeps the piston’s o-ring wet enough for good sealing.
Wth the spark and fuel sorted out, combustion will be stronger, the head will run hotter, and carburetor adjustments will have more affect. Then, if you want to get more involved, check valve lash and compression on both sides for uniformity.
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