G1 overhaul issues, low compression, no power

sho305 · 08-23-2015, 05:21 PM

With it that sad, you need a new bore one way or another. It will run like new, it will be like new, and fresh bore is where its at with 2 strokes. You can also cut the head some for a bit of power, you can't cut too far or it gets into the chamber. Compression is very low on those so it helps some. After all that you should check out the clutches because if they don't work right it will never run like it should.

G1yamahauler · 08-23-2015, 09:24 PM

Can't wait to get it back and back together. I have already completed the muffler BBQ. So it should run pretty good.

Can someone let me know if a sealer is used on the lower gasket on the cylinder head? The one from block to head. Or do i install it dry.

G1yamahauler · 08-31-2015, 09:55 AM

Okay guys, I have a fresh bore .50 oversize completed. I have checked the compression and not sure whats going on but it shows only a small improvement at 70 psi. Does it take a bit for the rings to seat in for better compression? Or is there something else to check?

sho305 · 08-31-2015, 05:30 PM

It does, you can also try putting a little oil in the cylinder for the rings. Also make sure you turn it over until the gauge stops moving upwards.

Spicyunicorn · 08-31-2015, 05:57 PM

did you gap the rings to spec?

G1yamahauler · 09-10-2015, 02:02 PM

I left the specifications to the machine shop. I did not gap the rings personally. Since I have been running it now for a little while, I feel that the engine is running better. I also checked the reed valves. It looks like two of the reeds was hanging open a bit. Went ahead and replaced the carburetor as well. Now I think that the power is there but the clutches are old and tired and not adjusting up and down correctly.

Field6565 · 09-10-2015, 02:07 PM

If you've never done it, I would clean the clutches. Sometimes they get dirty and get hung up and not shift right.

08-23-2015, 05:21 PM	#11
sho305 Vegas modded 420 Join Date: Jun 2009 Location: West MI Posts: 15,443	Re: G1 overhaul issues, low compression, no power With it that sad, you need a new bore one way or another. It will run like new, it will be like new, and fresh bore is where its at with 2 strokes. You can also cut the head some for a bit of power, you can't cut too far or it gets into the chamber. Compression is very low on those so it helps some. After all that you should check out the clutches because if they don't work right it will never run like it should.

08-23-2015, 09:24 PM	#12
G1yamahauler Not Yet Wild Join Date: Aug 2015 Posts: 14	Re: G1 overhaul issues, low compression, no power Can't wait to get it back and back together. I have already completed the muffler BBQ. So it should run pretty good. Can someone let me know if a sealer is used on the lower gasket on the cylinder head? The one from block to head. Or do i install it dry.
G1yamahauler Not Yet Wild Join Date: Aug 2015 Posts: 14

08-31-2015, 09:55 AM	#13
G1yamahauler Not Yet Wild Join Date: Aug 2015 Posts: 14	Re: G1 overhaul issues, low compression, no power Okay guys, I have a fresh bore .50 oversize completed. I have checked the compression and not sure whats going on but it shows only a small improvement at 70 psi. Does it take a bit for the rings to seat in for better compression? Or is there something else to check?
G1yamahauler Not Yet Wild Join Date: Aug 2015 Posts: 14

08-31-2015, 05:30 PM	#14
sho305 Vegas modded 420 Join Date: Jun 2009 Location: West MI Posts: 15,443	Re: G1 overhaul issues, low compression, no power It does, you can also try putting a little oil in the cylinder for the rings. Also make sure you turn it over until the gauge stops moving upwards.

08-31-2015, 05:57 PM	#15
Spicyunicorn Gone Wild Join Date: Jun 2015 Location: NW Iowa Posts: 1,669	Re: G1 overhaul issues, low compression, no power did you gap the rings to spec?

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09-10-2015, 02:02 PM	#16
G1yamahauler Not Yet Wild Join Date: Aug 2015 Posts: 14	Re: G1 overhaul issues, low compression, no power I left the specifications to the machine shop. I did not gap the rings personally. Since I have been running it now for a little while, I feel that the engine is running better. I also checked the reed valves. It looks like two of the reeds was hanging open a bit. Went ahead and replaced the carburetor as well. Now I think that the power is there but the clutches are old and tired and not adjusting up and down correctly.
G1yamahauler Not Yet Wild Join Date: Aug 2015 Posts: 14

09-10-2015, 02:07 PM	#17
Field6565 Gone Wild Join Date: Oct 2010 Location: Pittsburgh Pa Posts: 1,551	Re: G1 overhaul issues, low compression, no power If you've never done it, I would clean the clutches. Sometimes they get dirty and get hung up and not shift right.

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