what causes an engine to ping, if their is a way to prevent it or stop it ,how?

lean mixture, air leak, high compression with low octane can cause the engine to ping. Make sure jetting is spot on, no air leaks, and that your bike uses high enough octane.

would straight 94 octane pump gas be sufficeient or should i mix in some octane booster or race gas?

well if its stock, yam. says to use premium, so that should be fine

the number one cause of pinging tho is using a fuel with to low of a octane

what year, condition and level of modification is the bike? adrenaline is right on with what he told you

My 01 YZ250 has always pinged on anything less than 100+ race gas.

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