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10-17-2019, 07:45 AM | #1 |
Not Yet Wild
Join Date: Oct 2019
Posts: 18
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STUMPED full rebuild and still 60 psi of compression
2pg two stroke was running really slow and had 60 psi of compression, I did a complete top end rebuild, new jug, piston, rings, head gasket etc, I am STILL only getting 60 psi of compression?????? it starts right up and runs but its very sluggish on hills! I have tried two different compression gauges, one is new, and the piston is in the right way. I also inspected and changed reed valve seals. I am stumped... Could I have a bad head? The vent tube also pours gas out of it, I am going to order a new carb today.
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10-17-2019, 07:57 AM | #2 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,673
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Re: STUMPED full rebuild and still 60 psi of compression
Couple things, first, (just to make sure) hold the carb butterfly all the way open with your hands while cranking during compression test or it will read low. Secondly, it can take a little run time for the rings to seat. Once seated compression will increase.
Did you install the rings the correct direction? I don't knowk about the 2pg specifically, but most 2 stroke motors (or motors in general) the top ring is different from the 2nd ring. And they CAN be installed upside down. There should be a dot, or a letter, or some type of a mark indicating "this side up" on the ring. Both of which will affect compression. Did you replace crank seals while it was apart? |
10-17-2019, 08:01 AM | #3 |
Gone Wild
Join Date: May 2011
Location: Pittsburgh
Posts: 2,944
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Re: STUMPED full rebuild and still 60 psi of compression
I am not an EZGo guy but know other 2 cycle carts pretty well. If the below is not correct someone will chime in
Man, 60 psi is low. That thing shouldn't be running at all. I know you have tried a couple of different gauges but 60 psi still sounds too low to run and I suspect that there is something up with those readings. Fuel coming from your vent tube is a concern as that means that your float bowl is flooding. Did you try adjusting your float a bit? If your carb is flooding out it can cause sluggish running. |
10-17-2019, 09:16 AM | #4 |
Test before replacing
Join Date: Aug 2013
Location: Ohio side of the Pennsylvania border.
Posts: 3,495
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Re: STUMPED full rebuild and still 60 psi of compression
Starting right up, and running, but still having 60 psi on two gauges leads me to believe that it's your technique, not the actual compression.
Sluggish on hills points to a clutch problem. An overflowing vent points to a float that needs to be adjusted. Sometimes overtightening the bowl nut will crush the bottom of the bowl. That will block the cross drilled holes in the stem causing the gas to also spill out of the vent. Depending how badly they are blocked, the cart won't run at all, or will run poorly from a lack of fuel. The rings are Keystone type. The bevel side goes up, and the ends wrap around the alignment pins in the ring grooves. Did you check the ring gap before installation? This manual will have all of your specs. |
10-17-2019, 09:25 AM | #5 | |
Not Yet Wild
Join Date: Oct 2019
Posts: 18
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Re: STUMPED full rebuild and still 60 psi of compression
Quote:
Thanks for the reply... I am not sure how else i can check the compression. I pulled the carb and the exhaust and rechecked the compression with very little change. I was able to see the rings through the exhaust port and i am pretty sure the bevel side it towards the head, I am getting ready to go down and recheck that. I am going to order a new carb, Both of the clutches are new and so is the belt. I am thinking the carb is flooding causing it to fully run. I haven't started to look at the ignition system yet. The 60 psi is just what gets me but i do agree that it should not run with that low of compression. I am going to go to autozone and rent their gauge and see if there is any different but i check my two gauges with an air compressor and they both read correct. |
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10-17-2019, 09:42 AM | #6 | |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,673
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Re: STUMPED full rebuild and still 60 psi of compression
Quote:
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10-17-2019, 10:48 AM | #7 | |
Not Yet Wild
Join Date: Oct 2019
Posts: 18
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Re: STUMPED full rebuild and still 60 psi of compression
Quote:
Thanks for the suggestion I will order one. I just pulled the engine, the rings were upside down so i filled them over still no change. i installed the old head gasket and got 80psi gained 20 psi, so i am thinking it has to be in the head. I put a straight edge on it and everything looks straight. Is there anyway to do a leak down test? |
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10-17-2019, 11:21 AM | #8 |
Gone Wild
Join Date: May 2011
Location: Pittsburgh
Posts: 2,944
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Re: STUMPED full rebuild and still 60 psi of compression
You can try doubling up on the head gaskets. If the head / cylinder aren't still perfectly milled after all of these years sometimes another gasket will rectify things.
Leak downs can be done a couple of ways, the entire engine or just the top end. With the latter, which is all you probably need, just get a good compression reading, leave the compression gauge in place and leave things sit. Your compression should hold steady for hours. Simple additional thought...are you torquing your bolts to spec? Too little and things will leak. Too tight and you'll warp the head gasket. Also, I am not sure about your cart but a lot of motors require a specific sequence of tightening the head bolts. Would anyone know if that's the case with a 2pg? |
10-17-2019, 11:27 AM | #9 | |
Not Yet Wild
Join Date: Oct 2019
Posts: 18
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Re: STUMPED full rebuild and still 60 psi of compression
Quote:
i doubled the gaskets still that same, I torqued them to 18 ft lb in a star pattern, when i torqued them to 28 that is when i got the extra 20 psi. |
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10-17-2019, 11:59 AM | #10 | |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,673
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Re: STUMPED full rebuild and still 60 psi of compression
Quote:
If it's warped or if there's a gouge in it or something uneven, this can usually take care of it pretty easily/quickly. just take your time and go slow. |
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Tags |
2pg, help please, rebuild |
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