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Old 02-15-2021, 09:22 PM   #21
Tankercart
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Default Re: Par car slow all the time

Do you think my battery might now have enough cranking amps? I’m using a marine deep cycle battery with 690 cranking amps...

It’s so bizarre how easy this cart starts. Doesn’t ever need choked. I am using the ezgo carb and I noticed the carb isn’t opening all the way when I run it on stands and open the throttle the primary and secondary clutch are more active so that’s a good sign that they work.

I sprayed soapy water all over the head and cylinder.. the only bubbles I noticed came from the first exhaust slip joint.

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Old 02-15-2021, 09:30 PM   #22
Tankercart
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Default Re: Par car slow all the time

I’ll pull off the cylinder measure the ring gap tomorrow and report back.

Not to get off track but there are two holes in the muffler. Are these suppose to be there?
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Old 02-16-2021, 12:16 PM   #23
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Default Re: Par car slow all the time

You are good with that muffler. You can plug those holes if you want. I recall those being used to mount something but, by the life of me, I can't recall what.

Those EZ Go carbs are the way to go BTW. I hate the original Walbros.

That your clutches are working with no load probably means that they are good. I am back to low compression being your issue. Ring gap is important but I am not sure those are going to cause a 30 psi loss.

I wonder if the cylinder head didn't become warped from an earlier over heat or something. I know you don't want to hear this but it might be time to give a new cylinder a try.
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Old 02-16-2021, 12:43 PM   #24
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Default Re: Par car slow all the time

Does a new head come with a new cylinder? Should I look into getting the head or cylinder machined worked?
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Old 02-16-2021, 01:24 PM   #25
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Default Re: Par car slow all the time

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Originally Posted by Tankercart View Post
Does a new head come with a new cylinder? Should I look into getting the head or cylinder machined worked?
Head usually sold separately. I’d hold off for a bit. You said you did the soapy water trick around the head and saw no bubbles. It’s a bit of a mystery, but let’s get it figured out.

-Did you run compression with exhaust disconnected? Curious on the results.
- Did you chisel out the carbon build up from the exhaust port?
-You are using a head gasket...right?

Also, if you squirt some motor oil through the spark plug hole a then run compression test, does compression noticeably increase? That would indicate bad rings or sloppy cylinder.
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Old 02-16-2021, 01:38 PM   #26
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Default Re: Par car slow all the time

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Originally Posted by Tankercart View Post
I’ll pull off the cylinder measure the ring gap tomorrow and report back.

Not to get off track but there are two holes in the muffler. Are these suppose to be there?
I’ll pop the lid on the neighbors 92 par car and doublecheck for you. I’ll also run a compression test just to see what’s up.. probably be tomorrow before I can do it.
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Old 02-16-2021, 07:55 PM   #27
Tankercart
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Default Re: Par car slow all the time

No. I haven’t taken the cylinder back off yet. The compression doesn’t change when I removed the exhaust from the first slip joint.

That’s an interesting test. How much oil would you put in there? Should it be diluted with gas? Is there a YouTube video for this kind of compression test?
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Old 02-17-2021, 08:28 AM   #28
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Default Re: Par car slow all the time

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Originally Posted by Tankercart View Post
No. I haven’t taken the cylinder back off yet. The compression doesn’t change when I removed the exhaust from the first slip joint.

That’s an interesting test. How much oil would you put in there? Should it be diluted with gas? Is there a YouTube video for this kind of compression test?
It’s a common test for compression. Give a couple good squirts , or about a table spoon, with an oil can.

Usually performed on 4 stroke engines, but it works for a two stroke also. If compression comes up noticeably, say 30 psi (ish) you have bad ring to cylinder sealing. If it stays slow, the air is going someplace else..
Google compression test with oil.
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Old 02-17-2021, 02:32 PM   #29
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I’ll pop the lid on the neighbors 92 par car and doublecheck for you. I’ll also run a compression test just to see what’s up.. probably be tomorrow before I can do it.
Here’s the neighbors Par Car. No muffler holes.

BTW- Google “wet compression test”.

And...today I ran a compression test on my G1. I'm about 120psi. Then I blocked off the muffler by sticking by gloved finger up the tail pipe to see what really happens to compression with clogged exhaust. Lo and behold..compression did NOT drop. After multiple tests, it remained 120 and on three or four runs actually jumped to 150... so...hmmmm...
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Old 02-17-2021, 09:16 PM   #30
Tankercart
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Default Re: Par car slow all the time

gloved finger up the tail pipe.... lol nice. So I took the cylinder off and used the manual lochlin already posted for measuring and inspection. Sadly didn't find anything substantial to determine the cylinder is out of round. A little larger at the bottom of the cylinder but still well within limits. The ring gap is larger. The manual states .007-.023, and mine is .046.

I placed the cylinder on level surface and set the head on top with no gasket in-between. I do notice a very slight rocking one direction and not the other....

After re-examining the piston it's a little more worn than I thought. The skirt has some irregularities. I could buy a new one for 50 bucks and hope for the best.... But I talked to a guy today who told me he'd bore the next OS and mill the head ($70) if I got him the bigger piston and rings. All in $140 dollars. That's 20 dollars cheaper then the new cylinder, but I'd still have to clean all that carbon out of the exhaust port... what do you guys think? .020? worth it?

Side note: the piston connecting rod has some radical play. is that normal? I think there's a roller bearing in there, and probably shouldn't have slop, but it's a 30 year old engine.
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