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CRF 250 head Flowed

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I just finished flowing a 05 crf 250 head and it out flows the 04 head over the entire curve by a couple of cfm ,i havent had a chance to measure the portcross section down port yet, it still looks a little larger than it should be i will have to see if its close to the entry port area .the 05 head should be an improvement in power over the entire curve compared to the 04 head .

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RHC

How does a modded 04 head compare to the 05. I remember you getting the 04 to flow very well after some putty work.

Mike

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the moded 04 head out flows the stock 05 head by 7-8 cfm

Ron, will the epoxy ever deteriorate or break loose in the head? are there any possible problems with an epoxied head? thanks

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Rich the 05 head out flowed the 04 head @ every point in .050" increments i made a special fixture to open the valves last year and it seems to produce repeatable results i also tested the head with out valves in it .the flow was a couple cfm better .the 04 head peaked flow @ .350" lift the 05 head continued to gain flow @ higher lifts a good indicator the air is folowing the short side better .

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is getting an 05 head ported worth it? or is it becoming a waste because stock heads aare getting better and better.

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