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Unread 08-06-2016, 03:37 PM   #21
Not Yet Wild
 
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Ok so I checked the compression and it's only about 60 psi... Seems low. I just replaced the head gasket and piston rings. Head looked clean and smooth, what else could it be?
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Unread 08-06-2016, 06:54 PM   #22
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Default Re: 1989 Par Car Fuel Issue

Rings don't fit, Cylinder scored, Ring broke on installation or rings not gaped correctly and not fitted on the ring locating pin, cracked head piston in backward. In a nut shell---something in the top end is not correct or broken.
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Unread 08-06-2016, 08:42 PM   #23
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Default Re: 1989 Par Car Fuel Issue

In a rebuild, a worn out jug will need to be re-bored to a specified size compared to the size of the oversized piston that is to be installed. I don't know the exact numbers right off hand but they are in the service manual. Just throwing a set of rings on a piston that has a worn out jug is not the way to rebuild the top end. You might be able to do that if the jug isn't worn too far out of specs.

There were jug/piston/ring sets available last time I looked that shouldn't require any machine shopping, but you still have to file down the end of the rings for proper fitment and the specs are in the service manual. Look for piston ring end gap. A machine shop should be able to set them for you.
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Unread 08-16-2016, 07:14 PM   #24
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I don't think the jug was worn out when I replaced the piston rings. One had cracked.

On another note. I replaced the gas with fresh gas and charged up the battery while I was mowing the lawn and when I pushed on the gas, it fired right off the bat and continued to run while I depressed be gas for about 30 seconds. I had the gas entirely down but it did not try to move until it finally slowed to just the starter turning it over again.

Now it doesn't want to fire again and I see a lot of gas coming out of the air inlet to the carb (air filter is temporarily removed).

Is the gas thing normal /or does that possibly have something to do with why it stopped firing?

Also, what could cause it to run for 30 seconds but not move at all?
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Unread 08-16-2016, 09:08 PM   #25
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Default Re: 1989 Par Car Fuel Issue

Well just to be honest, you can't look at the jug and tell if it's worn out. Hence the low compression. You need tools to measure jug to see if it's worn out. If you only have 60 psi compression, you're going to have to fix your compression before the engine will run.

Are you sure the engine was actually running or was the starter turning the engine and you thought it was running?

Stick your hand over the air inlet and crank the engine and see if you can feel a good vacuum. If you do your carb needs rebuilt. It is possible that fouled out the plug but 60 psi compression is the likely problem.
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Unread 08-16-2016, 09:22 PM   #26
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Default Re: 1989 Par Car Fuel Issue

Pull the top end and check a ring in the cylinder and the gap should be around .012 to .017 I didn't check the manual so I could be off some. Check for broken rings. Also check the piston fit in the cylinder using a feeler gauge at the skirt. Again check the manual for measurements Around .007 I think but that is just a guess. Backyard is spot on on the compression. That low and it is a wonder you even got a response at all!
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Unread 08-16-2016, 10:30 PM   #27
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It definitely was firing as I could hear it firing which is much different than what it's sounded like the million other times I've turned it over
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Unread 08-17-2016, 06:01 AM   #28
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Default Re: 1989 Par Car Fuel Issue

when you put in new rings did you check the ring gap in the cylinder?
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Unread 08-17-2016, 07:34 AM   #29
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Default Re: 1989 Par Car Fuel Issue

Plain and simple, 60 psi is too low. You'll never get a good running engine with that. I am surprised you even got a 30 second run with 60 psi. Generally, you want to be 90 psi or higher. 80 - 90 is not great but doable. 70 - 80 may run but it's sketchy at best. Anything below 70 isn't a sustainable runner.

Something is up with your top end. TEW probably hit on it in that your piston and/or rings aren't the right size, someone in the past bored the cylinder to the wrong size, or something like that. You may have to bite the bullet and get a whole new top end kit to make sure your piston / rings / cylinder are matched.
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Unread 08-17-2016, 10:03 AM   #30
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Default Re: 1989 Par Car Fuel Issue

One other note. The piston is pinned on this engine so the rings MUST be positioned with the end gap at the piston pin.
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