Compression 03 600RR - Sportbike Forum: Sportbike Motorcycle Forums
 
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post #1 of 5 (permalink) Old 12-10-2008, 08:11 AM Thread Starter
 
Join Date: Feb 2004
Posts: 11
Compression 03 600RR

Anyone done a test on the compression re the 600RR 2003. I did mine and have 135 pounds across the board give or take a pound. The bike runs great, but I checked it to be safe as it has 50,000 miles on it. I did a wet dry test and there is no change in the readings.

When I check my manual the readings from Honda are 175 pounds, so I am a bit confused. I actually called them to see if there was a typo in the manual - being the first year for the 600rr and all. They confirmed it should be 175.

I checked my compression gauge on another bike and it is reading correctly.

Anytime I have had a problem with valves or rings on other engines it has been evident in the compression being low on one or two cylinders, but to be down on all four and down the same amount doesn''t make sense. I suppose its possible to have equal wear on valve guides or seats but it doesn''t seem logical, especially on a bike with multiple valves per cylinder for both intake and exhaust.

Anyone with any insight on this - feedback would be appreciated.
FoxHntr is offline  
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post #2 of 5 (permalink) Old 02-13-2009, 04:55 AM
 
Join Date: Nov 2008
Posts: 6
after 50k the cylinder walls and rings are going to be worn a little bit, it isnt going to have perfect compression with that many miles on it. The only weird part is that when you did a wet compression test it didnt change at all, usually it will get a little better when this is done, even on a new bike.
07cbr1000rr is offline  
post #3 of 5 (permalink) Old 02-13-2009, 04:59 AM
 
Join Date: Nov 2008
Posts: 6
also if you are worried about a leaky valve or leaking rings you can do a cylinder leak down test, with a diff. presser tester. This puts air into the cylinder from an outside source. with the piston at top dead center when you put 90 psi into the cylinder it should hold 15% or better, and if a valve is leaking badly you will be able to hear it through the intake or exhaust, or if a ring you will be able to hear air leaking from the oil fill.
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post #4 of 5 (permalink) Old 02-13-2009, 05:03 AM Thread Starter
 
Join Date: Feb 2004
Posts: 11
Yes, I think a leak down test is next on the agenda. Looking to buy a leakdown tester and there are several on e-bay at a reasonable price. Any recommendations from anyone who has purchased and used one would be appreciated.
FoxHntr is offline  
post #5 of 5 (permalink) Old 02-13-2009, 06:48 AM
 
Join Date: Nov 2008
Posts: 6
snap on or mac tools are both nice. i have both, just be carefull cause you will need to use an adapter for the correct threads and when unscrewing the tool sometimes it will leave the adapter in the spark plug hole, and its a pain in the ass to get back out, so make sure tha adapter is real tight on the hose for the tester. Also, when doing the test its always normal to get a little noise from the valves and the rings, nothing is ever tight enough to block all air, but anything excessive should be imediately noticeable. If you think you have a valve problem rum a vaccum test, when running if the vaccum needle is jumping around alot you have a problem.
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