[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.

 

[Out_Door_Lover]

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.

Where do you check your compression from as I thought it plugged into the spark plug but you said 450 RPM and without the spark plug it’s not gonna run can you please help me out on this matter thank you