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jkv45 · April 29th, 2019, 07:53 AM

Some Kawasaki twins have experienced issues with the valves dropping into the valve seats, which may explain the ever-increasing valve clearances.

To break a rocker I would expect that you would need to contact the piston with the valve.

This is what happened when the cam timing slips and a valve contacts the piston on our CRF150R -

I'd check the cam timing and also take a look at the top of the piston if you can.

I wouldn't run a 10W-50 oil. I'd run a synthetic 5W or 10W-40. There may have been some oil-related issues in the past if the cam was chewed-up, though you can see our cam got messed-up due to the other damage.

April 29th, 2019, 07:53 AM	#7
jkv45 Rev Limiter Name: Jay Location: WI Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot. MOTM - Jun '18, Oct '16	Some Kawasaki twins have experienced issues with the valves dropping into the valve seats, which may explain the ever-increasing valve clearances. To break a rocker I would expect that you would need to contact the piston with the valve. This is what happened when the cam timing slips and a valve contacts the piston on our CRF150R - I'd check the cam timing and also take a look at the top of the piston if you can. I wouldn't run a 10W-50 oil. I'd run a synthetic 5W or 10W-40. There may have been some oil-related issues in the past if the cam was chewed-up, though you can see our cam got messed-up due to the other damage.