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Old 09-26-2018, 08:32 PM   #1
Hotrod2468
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Default 1985 Yamaha g1 low compression

Hello
I have a 1985 Yamaha g1 that had 70 lbs of compression. I've replaced the crank seals, replaced rings.The piston and cylinder we're not scratched, I had 10/1000's movement. I Took it back apart to make sure I didn't break the new rings and still only get 70 lbs of compression. Can anyone help or have the same problem
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Old 09-26-2018, 08:35 PM   #2
trentofdestiny
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Default Re: 1985 Yamaha g1 low compression

How are the reeds?


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Old 09-27-2018, 05:49 AM   #3
Hotrod2468
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Default Re: 1985 Yamaha g1 low compression

The head is also torqued to 18.5 ft lbs.
Also with the muffler off ,I can cover the exhaust on the cylinder and the compression jumps up to 90lbs of compression.
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Old 09-27-2018, 05:52 AM   #4
Hotrod2468
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Default Re: 1985 Yamaha g1 low compression

The reeds didn't look to bad,I was able to move them and they seemed like they closed .
I'm new to the 2 stroke g1.
What do I need to look for on the reeds?
Thank you
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Old 09-27-2018, 06:32 AM   #5
trentofdestiny
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Default Re: 1985 Yamaha g1 low compression

They should be closed at rest or just slightly open. The vacuum of the piston moving should suck them closed. If their gap is more than maybe a sheet of thin cardboard then they are bad


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Old 09-27-2018, 07:21 AM   #6
Hotrod2468
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Default Re: 1985 Yamaha g1 low compression

I will check them out this afternoon. And I will let you know. If the reeds are good ,what else would I look for?
Thank you
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Old 09-27-2018, 07:30 AM   #7
trentofdestiny
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Default Re: 1985 Yamaha g1 low compression

Well let's see...piston installed with side holes facing carb, piston rings installed correctly, not too much clearance between cylinder and piston...that's really all I can think of. Low compression usually comes down to either rings or valves.


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Old 09-27-2018, 07:36 AM   #8
Hotrod2468
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Default Re: 1985 Yamaha g1 low compression

Thanks
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Old 09-27-2018, 07:39 AM   #9
Hotrod2468
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Default Re: 1985 Yamaha g1 low compression

I've heard that I could flip the reed valves.
Does that sound right?
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Old 09-27-2018, 07:40 AM   #10
trentofdestiny
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Default Re: 1985 Yamaha g1 low compression

Quote:
Originally Posted by Hotrod2468 View Post
I've heard that I could flip the reed valves.
Does that sound right?


Yes, in a pinch you could do that but they won't last as long as new ones. Don't forget you will also need (2) reed valve cage gaskets unless yours are still okay.


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