My JD barely turns over (B&S Intek OHV 17Hp 31F707 0112E1 030115ZE)... basically stops spinning on every compression stroke. At most I can get a backfire out of it (I now think it was probably caused by the spark generated on the exhaust cycle firing on the unused gas). My first thought was my battery was not delivering so I replaced it with a new 300 CCA - no improvement.
I was happy to read on this forum it was likely either my valve clearances or gas leaking into the cylinder causing hydraulic lock.
I have confirmed that there was no gas in the cylinder and that gas is being delivered to the carburetor.
I am getting good spark.
I have carefully set my valves to .003-.005 Intake and .005-.007 Exhaust after the cylinder has gone down 1/4" after TDC.
Still no improvement.
After reading here about the compression release arm in B&S engines that should prevent the intake from closing all the way at low revs (start up) I decided to measure when the intake valve closes (from what I understand the reason we set the valve clearance on a B&S 1/4" after TDC is because this release arm should be interfering with measurement of arm clearance earlier in the stroke. On my engine, the valve is solidly closed at TDC and for about 90 degrees before (i.e. my feeler gauge slides in anywhere in this arc before TDC - just like the at the position where the adjustment is to be made).
At this point I'm guessing that this little compression release arm is messed up somehow and my next step is to pull the engine and open it up... is there anything else I have missed? Is this the next step? I've always thought my engine doesn't spin up as well as it should, but now it's hopeless.
Thank you for any input.
Barry
mownie
walt2002
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