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2008 YAMAHA YZ450F GYTR HEAD INFORMATION

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Does anyone here have information on the GYTR Head for the 5Valve motors?

 

Specifically-The valve spring capacities.

I have their GYTR camshafts installed. Unfortunately the power delivery range is not where I need it to be for my application.

I have the Web 963 camshaft in my 2008 WR450.I bought springs that can handle up to .400 of lift.

.356 is what the 963 grind produces plus .030 is wat Webb recomends as a buffer.It seems like a GYTR would come with performance springs but I cannot find any information.

Any help would be great.

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