blackandyellowshee Posted August 27, 2006 Report Posted August 27, 2006 Hey I know that when you do a compression test, it is supposed to be cold and WOT. Will it still be accurate if it is warmed up? Thanks Darren Quote
DUB Posted August 27, 2006 Report Posted August 27, 2006 Hey I know that when you do a compression test, it is supposed to be cold and WOT. Will it still be accurate if it is warmed up? Thanks Darren I believe so but wait for a few more opinions.... Quote
dajogejr Posted August 27, 2006 Report Posted August 27, 2006 That's actually backwards. Warm it up to operating temps. Pull both plugs, hold the throttle WOT and keep on kicking until the needle won't go anymore.... It will normally read a few pounds more when warm....due to heat/expansion and better sealing. You can take a cold and hot reading...but, any compression spec for maintenance or replacement is based on a hot reading.... Quote
Handyman Posted August 27, 2006 Report Posted August 27, 2006 That's actually backwards. Warm it up to operating temps. Pull both plugs, hold the throttle WOT and keep on kicking until the needle won't go anymore.... It will normally read a few pounds more when warm....due to heat/expansion and better sealing. You can take a cold and hot reading...but, any compression spec for maintenance or replacement is based on a hot reading.... I've always warmed the engine up before i take a compression test. You want the compression at the engine's normal operating temps. The engine isn't cold when riding around all day. some people take a cold reading and then a warm reading. If you do both and a have a lower reading when warm you may have a new top end in the very near future. Quote
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