Join Date: Nov 2009
Location: Lander, Wyoming
This is the '09 from Cody, WY. 13,700 miles.
Last spring Before I re-adjusted valve tappets this engine was pushing over 130 PSI. After valve adjust and MC mod, it pushed over 150 PSI, at 5347 ft of altitude.
Any mathematicians able to calculate Sea Level cold cranking compression from this info?
When it is was a stone stock oil burner/hard starter. It had less than 70 psi.
Re-cut (narrowed) valve seats and lapped valves along with the Schnitz 685 piston kit back in 2010. Also trimmed some height off the KACR pin at that time.
IT is Not the height of lift that is important with the KACR, It IS the Closing Point. Less Height closes Earlier. We had about 118 lbs, Freshly assembled, Not test started, COLD, in 2010.
So this engine has 4 things which has improved the CCC.
Good valve sealing, KACR mod, 685 piston kit, MC mod (exhaust cam advancement).
I'm thinking 150psi+ and sea level, the Limiter may have said 'too much'!
Maybe this might be part of the reason the Up-dated Limiter gear is on back-order? Lots of properly rebuilt 685, 688, 692, 705 KLR's out there.
Modify at "YOUR OWN RISK"!
Still riding my 1987 KL650-A1. 84,000+ miles & counting
Last edited by pdwestman; 03-28-2015 at 05:21 PM.