I checked the compression on my 03 SXR and the back is 150 and the front is 125. I'm installing an ADA girdled head this weekend and wondered if i should just replace rings or pistons and rings ? Can these cylinders be bored or are they plated like some dirtbike cylinders that can't be bored and need re-sleeved ? Let me know what you think - Thanks
SXR Compression help ?
- Thread starter Scoobydoo
- Start date
- Location
- knoxville,tn
You can try and hone and re-ring the piston..If the compression doesnt come up then you will need to bore.
Any idea of what caused the loss in compression?
oil - water - ??
- Location
- Cleveland Ohio
I would just say hell with it and throw a top end in it. Get it bored and order a kit from Wiseco. If it's a 2003, it is overdue.
- Location
- Mooresville, NC
A 2003 overdue? HA! My rule of thumb w/ 2 smokes is run em till they go! 25 LBS low on a cylinder will still run well, but it's out of spec for sure (10% on 150 is 15 LBS acceptable difference). I have owned/run 1990 SJ's w/ original motors, and dead on compression - just depends. I would pull the top end this winter, you may have some scoring on that 1 cylinder, but it's hard to tell. Only one way to find out!
THRUST
ThrustInnovations.com
- Location
- royal palm beach florida
ok so you let it go and it ends up costing alot more than rings . like crank cases two new pistons and a sleeve . do the hone and rings . if it is a new engine a few months old run the ski then double and triple check your compression (maybe you didnt get the gauge on tight )
Not what Kurt and I are saying.
25 psi difference, yes you need to take a look at the top end and fix it.
we cordially disagree with DJ saying a 2003 is overdue for a top end
based on age alone
Last edited:
Gainera2582
Power and Agility
- Location
- Lake Saint Clair, Michigan
Do a top end. I would never increase the compression on a ski if the cylinders aren't even in psi.