G1 Not Running - Help!

diesel_farmer · 07-08-2011, 11:55 AM

I searched the forum and didn't find any posts on point.

Recently purchased a G1 gas. Have good spark with new spark plug, gas up to the carb, but will not fire. It turns over fine, but no fire. After turning over for 10-15 seconds, it kicks some air (or something) out - appears as though it's coming out of a hose off of the carb. Any thoughts on what I might look at to get it going? Thanks.

diesel_farmer · 07-08-2011, 07:50 PM

Only 30 psi of compression. I think I need a rebuild.

Just Ducky · 07-14-2011, 11:41 PM

Hey Diesel Farmer, how's it going? It sounds as though some engine work is in your future. How about some pictures of your cart and keep us up to date on the rebuild.

diesel_farmer · 07-15-2011, 07:07 AM

Quote:

Originally Posted by Just Ducky

Hey Diesel Farmer, how's it going? It sounds as though some engine work is in your future. How about some pictures of your cart and keep us up to date on the rebuild.

I only have 30 lbs of compression. I am guessing that the valve is stuck open which is why I am not getting compression. I need to find a service manual to see if I figure out how to get to the valve. Supposedly the motor was rebuilt a couple of years ago. I was told that it ran fine and then all of the sudden started missing. They played with the plug wire and pulled it out of the coil. I cut off the plug wire and screwed it back into the coil and put in a new spark plug and it appears to have good spark. But I have gas up to the carb and it doesn't want to fire. Appears to be backfiring - after it's turned over for 10-15 seconds it starts spitting air back out of the carb. Any more thoughts before I try to disassemble it? Thanks.

Just Ducky · 07-15-2011, 11:01 AM

I hope someone has some good advice on this particular. Have you read the stickies at the top of the Gas Yamaha area yet? There is some good material there. I'll be in your shoes soon as I try to figure out exactly what's wrong with my G1.

2HawkFans · 07-15-2011, 12:51 PM

Did you put a little oil into the cylinder before your compression test? That will help a little to make sure the rings are sealing. If it's truly a G1 with the stock 2 stroke it isn't a valve issue.

diesel_farmer · 09-24-2011, 09:23 AM

Ok, I am back working on my G1. The armature went out of the starter so I had it rebuilt. With and without the muffler on I get 40 psi compression in forward and 30 psi compression in reverse. I did shoot some oil in the cylinder to seal it. Any other thoughts before I dismantle for a rebuild? Also, do I probably need a manual to do a rebuild or are there some good threads on engine disassemble/rebuild?

BTW, I was told when I bought it that the engine was recently rebuilt and that it was running fine and just all of the sudden stopped running.

Thanks for any thoughts.

bigstik40 · 09-24-2011, 12:41 PM

Just grabbin at a few straws here: Blown head gasket, maybe. Stuck rings-maybe shoot a little ether into it, just to get it running and warmed up. Marvel Mystery oil overnight in cylinder if rings stuck. With 30-40 PSI doesn't look real good for you. If it was actually rebuilt recently, may only be rings, piston, cylinder issue. Good luck - RAY

diesel_farmer · 09-24-2011, 12:45 PM

Thanks for the thoughts. What is the little hose sticking out of the back of the engine just below the carb? It wants to kick out air/oil? when I turn it over.

kaublr · 09-24-2011, 12:58 PM

that little hose is the pulse line that runs the fuel pump, needs to be attached to fill the card float bowl

07-08-2011, 11:55 AM	#1
diesel_farmer Not Yet Wild Join Date: Jul 2011 Location: Peoria, Illinois Posts: 12	G1 Not Running - Help! I searched the forum and didn't find any posts on point. Recently purchased a G1 gas. Have good spark with new spark plug, gas up to the carb, but will not fire. It turns over fine, but no fire. After turning over for 10-15 seconds, it kicks some air (or something) out - appears as though it's coming out of a hose off of the carb. Any thoughts on what I might look at to get it going? Thanks.

07-08-2011, 07:50 PM	#2
diesel_farmer Not Yet Wild Join Date: Jul 2011 Location: Peoria, Illinois Posts: 12	Re: G1 Not Running - Help! Only 30 psi of compression. I think I need a rebuild.

07-14-2011, 11:41 PM	#3
Just Ducky Getting Wild Join Date: May 2011 Location: North Central Vermont Posts: 97	Re: G1 Not Running - Help! Hey Diesel Farmer, how's it going? It sounds as though some engine work is in your future. How about some pictures of your cart and keep us up to date on the rebuild.

07-15-2011, 11:01 AM	#5
Just Ducky Getting Wild Join Date: May 2011 Location: North Central Vermont Posts: 97	Re: G1 Not Running - Help! I hope someone has some good advice on this particular. Have you read the stickies at the top of the Gas Yamaha area yet? There is some good material there. I'll be in your shoes soon as I try to figure out exactly what's wrong with my G1.

07-15-2011, 12:51 PM	#6
2HawkFans Not Yet Wild Join Date: Aug 2009 Location: Iowa Posts: 54	Re: G1 Not Running - Help! Did you put a little oil into the cylinder before your compression test? That will help a little to make sure the rings are sealing. If it's truly a G1 with the stock 2 stroke it isn't a valve issue.

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09-24-2011, 09:23 AM	#7
diesel_farmer Not Yet Wild Join Date: Jul 2011 Location: Peoria, Illinois Posts: 12	Re: G1 Not Running - Help! Ok, I am back working on my G1. The armature went out of the starter so I had it rebuilt. With and without the muffler on I get 40 psi compression in forward and 30 psi compression in reverse. I did shoot some oil in the cylinder to seal it. Any other thoughts before I dismantle for a rebuild? Also, do I probably need a manual to do a rebuild or are there some good threads on engine disassemble/rebuild? BTW, I was told when I bought it that the engine was recently rebuilt and that it was running fine and just all of the sudden stopped running. Thanks for any thoughts.

09-24-2011, 12:41 PM	#8
bigstik40 Gone Wild Join Date: Sep 2010 Location: Erie, Pennsylvania Posts: 989	Re: G1 Not Running - Help! *Just grabbin at a few straws here:* Blown head gasket, maybe. Stuck rings-maybe shoot a little ether into it, just to get it running and warmed up. Marvel Mystery oil overnight in cylinder if rings stuck. With 30-40 PSI doesn't look real good for you. If it was actually rebuilt recently, may only be rings, piston, cylinder issue. Good luck - RAY

09-24-2011, 12:45 PM	#9
diesel_farmer Not Yet Wild Join Date: Jul 2011 Location: Peoria, Illinois Posts: 12	Re: G1 Not Running - Help! Thanks for the thoughts. What is the little hose sticking out of the back of the engine just below the carb? It wants to kick out air/oil? when I turn it over.

09-24-2011, 12:58 PM	#10
kaublr Not Yet Wild Join Date: Aug 2008 Posts: 43	Re: G1 Not Running - Help! that little hose is the pulse line that runs the fuel pump, needs to be attached to fill the card float bowl
kaublr Not Yet Wild Join Date: Aug 2008 Posts: 43

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