try a NGK b7hs i was running that on a modified hs50 it porbably won't matter what air filter you put on that unless you are porting the intake and exhaust ports and putting a less restrictive pipe on there.
try a NGK b7hs i was running that on a modified hs50 it porbably won't matter what air filter you put on that unless you are porting the intake and exhaust ports and putting a less restrictive pipe on there.
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