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Unread 08-11-2019, 09:37 PM   #11
Not Yet Wild
 
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Default Re: 1991 G8 - "0" Compression. Seals?

Problem solved thanks to CGTECH and CP241!
I finally got other projects finished and got back to this. I reinstalled the push rod and reset the valves. They were pretty much spot on to begin with but I readjusted just to be doubly sure. The breather valve was OK and working fine.
I'm still not sure what caused the push rod on the exhaust side to pop out. I had rebuilt the valves just a few years back so they should have been in good shape. The only thing I can think of is that the owner drives it like it's a Willys Jeep running from an ambush across pasture land and that maybe the "bouncing" caused it to pop out?
Any further thoughts are appreciated!
Thanks again,
SDR
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Unread 08-14-2019, 07:57 AM   #12
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Question Re: 1991 G8 - "0" Compression. Seals?

Well I reinstalled the push rod and reset the valves to .004. It started right up and seems to run strong in neutral. The problem is that it will barely move. Bogging down very bad like it's smothering out. Any ideas on what to do next. I'm thinking remove the head and clean the valves?
Thanks in advance
SDR
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Unread 08-14-2019, 09:53 PM   #13
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Default Re: 1991 G8 - "0" Compression. Seals?

Clutch problems? What's compression now?
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Unread 08-16-2019, 09:53 AM   #14
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Default Re: 1991 G8 - "0" Compression. Seals?

Compression is 185. My manual says it should be 142-199.
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Unread 08-16-2019, 10:11 AM   #15
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Default Re: 1991 G8 - "0" Compression. Seals?

Is the airbox in tact and the lid completely sealed? Is the carb spacer cracked? Has the carb been thoroughly cleaned? How's the spark look?


Lot of things can cause it to run good in neutral but bog when it's under load...
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Unread 08-16-2019, 03:25 PM   #16
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Default Re: 1991 G8 - "0" Compression. Seals?

With the high compression, do you think the valves are ok? I really hate to pull the head.
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Unread 08-17-2019, 06:40 AM   #17
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Default Re: 1991 G8 - "0" Compression. Seals?

Quote:
Originally Posted by CP241 View Post
Is the airbox in tact and the lid completely sealed? Is the carb spacer cracked? Has the carb been thoroughly cleaned? How's the spark look?


Lot of things can cause it to run good in neutral but bog when it's under load...
Air box is tight, good spark, carb spacer looks ok and it seems the clutch is fully engaging in neutral.
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Unread 08-17-2019, 07:53 AM   #18
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Default Re: 1991 G8 - "0" Compression. Seals?

You have to watch both clutches and make sure they are operating properly.

https://www.youtube.com/watch?v=uCEvBGT8twM

And I dont think theres any reason to pull the head.
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Unread 08-23-2019, 12:42 PM   #19
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Question Re: 1991 G8 - "0" Compression. Seals?

Still need advice. A recap:

Replaced the push rod on the exhaust valve and reset clearance.
Compression is strong at 185.
Good spark.
Cleaned carb.
Air box is tight. No leaks.
The oil level in the transmission was "0", so I drained what little was there and refilled it.

I replaced the belt, rear sheaves, helix and spring not too many years ago and the nylon tabs look still normal.

Jacked up the rear end and it runs strong in neutral. Sounds good without missing or anything. Both clutches front and rear seem to be fully engaging.

When you put it in either F or R it starts strong, the clutches engage, but it is not transmitting very much power to the wheels. Also the engine starts choking at the top end of throttle like it's meeting too much resistance although the wheels are off the ground. There isn't any strange noises coming from the rear end.

I'm stumped on what to do next. Any and all help is much appreciated!
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Unread 08-30-2019, 03:01 PM   #20
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Thumbs up Re: 1991 G8 - "0" Compression. Seals?

Just wanted to close this one out.
I took the driven clutch apart and the circlip / snap ring was in bad shape and came loose. Put it back together along with a new torsion spring and she's back on the street.

Thanks to those who offered their advice.

SDR
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