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Hard to start after new piston.

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Just put in a new hi comp (13/1) piston in and its verry hard to start especialy when the bike is warm

I have a 05 YZ450.

Jetting is from 175 to 172 main, 45 pilot.

Before the piston swap it was also hard to start when the bike was warm, if the bike was cold it was verry easy, blib the throttle twice and 1kick it would run.

I have a open airfilter system,mega bomb header and now a hi comp piston from wiseco.

Any sugestions?

Thanx in advance, Ron

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