129 Hard Starting - Page 3

Mike McKown · #21 10-09-2015, 03:18 PM

Quote:

Originally Posted by ol'George

Set the timing by the static method, sounds like it is advanced too much.

That's the first place I'd go.

zippy1 · #22 10-09-2015, 11:53 PM

Quote:

Originally Posted by sawdustdad

I've had a motor with a problematic ACR. It turns over a revolution or two, then slams/belt squeals, then it continues to turn over and starts no problem.

Huh, the two I've had/got problems with get to the compression stroke and that's it, won't go anywhere from there. My 123 I fixed by bending the tabs ever so little and it's been working perfectly for five years now.
My 1650 is another story. That one get's to the compression stroke and nothing. If I back the engine up by hand enough, then try it once in awhile it'll go. I've bent the tabs earlier this spring and it was good through the summer, but now it's back to not working, so a repair is in order...

mrmiller · #23 10-10-2015, 04:24 PM

Ok guys, this may sound crazy but I messed around with the 129 a little today and with everything I tried I am still having the same issue....BUT I once tried pulling off the air cleaner and it fired right up! I then put it back on and tried starting it and still had trouble removed the air cleaner twice more and fired right up again. I'm confused

zippy1 · #24 10-11-2015, 01:09 AM

Quote:

Originally Posted by mrmiller

Ok guys, this may sound crazy but I messed around with the 129 a little today and with everything I tried I am still having the same issue....BUT I once tried pulling off the air cleaner and it fired right up! I then put it back on and tried starting it and still had trouble removed the air cleaner twice more and fired right up again. I'm confused

You ain't the only one Martin

johns cubs · #25 10-11-2015, 02:50 AM

Quote:

Originally Posted by mrmiller

Ok guys, this may sound crazy but I messed around with the 129 a little today and with everything I tried I am still having the same issue....BUT I once tried pulling off the air cleaner and it fired right up! I then put it back on and tried starting it and still had trouble removed the air cleaner twice more and fired right up again. I'm confused

I have a 12hp tecumseh engine on an old ss12 craftsman that only turns over good with aircleaner off but hand completely covering carb. Once it turns 2 complete rotations move hand and it starts everytime. Choke dont do it, has to be tight seal on carb????

drglinski · #26 10-11-2015, 01:53 PM

Air cleaner element is dirty/plugged. Air cleaner holder is not allowing enough air into the engine. All possible solutions.

mrmiller · #27 10-11-2015, 02:33 PM

Quote:

Originally Posted by drglinski

Air cleaner element is dirty/plugged. Air cleaner holder is not allowing enough air into the engine. All possible solutions.

Has a brand new air filter.

mobermiller · #28 10-11-2015, 11:29 PM

I hope you guys figure this out! The suspense is getting the best of me!

I have a 1650 that does the same this on occasion. Removing the air filter makes no difference on mine though. That's weird!

ol'George · #29 10-11-2015, 11:47 PM

Is it possible the "new" air filter has some coating or wrapping on it that needs removed?
If you put the old filter back on does the problem go away?

tpelle · #30 10-24-2015, 03:08 PM

Those automatic compression releases can be a real pain! If you aren't familiar with them, they are built into the cam lobe that operates the exhaust valve.

The ACR consist of a spring-loaded arm that, when the engine is turning below a certain RPM, causes a sort of D-shaped "bump" to rotate proud of the exhaust cam lobe surface, but only when the engine is coming up on the compression stroke. So at lower RPM's the "bump" contacts the exhaust cam follower and bumps the exhaust valve open.

When the engine is rotating over that given RPM, such as when the starter motor really gets the engine cranking, the centrifugal force causes the arm to swing outwards, and the "bump" rotates to be flush with the cam. The exhaust valve remains closed on the compression stroke, allowing the engine to start and run.

If your battery is weak, it may not get the engine spinning fast enough to defeat the ACR, so the exhaust valve opens on each compression stroke and the engine never starts.

I put a pretty high cranking amp battery in my Frankentractor (1000 with a 1200 engine), and that baby starts almost immediately when you turn the key! Putting in a higher-than-stock cranking-amp-capacity battery does no harm to the starting circuit, as the starter motor will only draw the amps that it needs. But if the battery can't deliver the amps, then the starter motor is sort of choked off.