[OutboardBoy3]

I have a 2004 Honda Foreman 450 ES 4x4 and recently rebuilt the top end. After I did adjust the valves, and fired it up. Runs okay but did a compression check on it and it came in at 60 psi! I read somewhere that there is some kind of decompression valve, but is this normal?

 

[toodeep]

I would have to look it up but that sounds normal. The only way to get a true compression reading is to lossen the exhaust valve tappet. Personally I like the old saying, "If it ain't broke, don't fix it.".

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[bmiller]

See attached from the 98-01 service manual. Not sure if its the same but should give you an idea.

 

[bmiller]

Sorry realized the picture is tiny, Compression Pressure 78-121PSI at 450 RPM, If the compression is below he standard loosen the exhaust valve lock nut and turn the adjusting screw 1-1/2turn and recheck compression.