Finally did a compression test on my bike

thirdgenlxi · 05-08-2009, 12:12 AM

And I must say... not too bad! I think they actually would be better though if I had the correct fitting for the compression tester. The coupling I have is the right diameter and thread pitch for my cyl head, but it's about half the length of the threads on the plugs, so it's not long enough to thread in with the proper o-ring. I had to end up using a dinky little a/c o-ring which was thinner and did affect my readings some because it only threaded on maybe one turn (it was leaking a lil bit at one point). Had I used the correct fitting (which I can't seem to find anywhere) I have a feeling they would have been damn near spot on

Readings were....

cyl 1 - 175 psi
cyl 2 - 165 psi
cyl 3 - 170 psi
cyl 4 - 165 psi

The spec in the manual is 178 psi, so even with the coupling that didn't fit quite right, they were all still pretty close!

Plugs still looked pretty good too (had 38k miles on these plugs).... that's a very good thing, means she's running the way she should be (although I know it might be a lil rich cuz I need to have my PCIII tuned)

Oh yea air filter was looking pretty dirty too so I cleaned it out and re-oiled.... gotta get her all ready for this months round of roadtrips! LOL

05-08-2009, 12:12 AM	#1
thirdgenlxi They call me a ride whore Join Date: Dec 2008 Location: Mills River, NC Moto: 2004 CBR 600 F4i Posts: 353	Finally did a compression test on my bike And I must say... not too bad! I think they actually would be better though if I had the correct fitting for the compression tester. The coupling I have is the right diameter and thread pitch for my cyl head, but it's about half the length of the threads on the plugs, so it's not long enough to thread in with the proper o-ring. I had to end up using a dinky little a/c o-ring which was thinner and did affect my readings some because it only threaded on maybe one turn (it was leaking a lil bit at one point). Had I used the correct fitting (which I can't seem to find anywhere) I have a feeling they would have been damn near spot on Readings were.... cyl 1 - 175 psi cyl 2 - 165 psi cyl 3 - 170 psi cyl 4 - 165 psi The spec in the manual is 178 psi, so even with the coupling that didn't fit quite right, they were all still pretty close! Plugs still looked pretty good too (had 38k miles on these plugs).... that's a very good thing, means she's running the way she should be (although I know it might be a lil rich cuz I need to have my PCIII tuned) Oh yea air filter was looking pretty dirty too so I cleaned it out and re-oiled.... gotta get her all ready for this months round of roadtrips! LOL __________________ *-Jared* Black/Red '04 CBR 600 F4i - 253,500 miles and counting Black '89 Accord LX-i sedan - 435,200 miles still going strong States visited on my F4i facebook.com/thirdgenlxi Last edited by thirdgenlxi; 05-08-2009 at 12:14 AM..