Yamaha G1, Gas

Fostine Bowen · 10-13-2015, 07:45 AM

Want draft fuel into engine, new carb, fuel pump works fine, 70 psi comp. muffler been replaced, spray fuel into carb will run till you stop spraying.

Charlie

smallblock450sl · 10-13-2015, 06:41 PM

70 lbs compression (at wide open throttle) is to low. 1979 and up-120 lbs /good, 100 lbs minimum. 1982 115 lbs/good, 90 lbs miniumum.

Fostine Bowen · 10-14-2015, 02:36 PM

Yamaha G1 Gas, Pulled reeds and cleaned both side fit flush, cleaned fuel tank, fuel filter, pump works good, carb full of fuel, 100lbs compression. only runs if spray fuel into carb, however it smokes extremely BAD, eliminated oil injection, mix fuel 100 to one. same results. Muffler was replaced about 12 years ago.

Spicyunicorn · 10-14-2015, 03:20 PM

Is the bowl in the carburetor bowl filling up with fuel after running it?

slonomo · 10-14-2015, 04:37 PM

Has this engine ever been running good while in your possession?

Fostine Bowen · 10-14-2015, 06:32 PM

Engine completely rebuilt 15years ago 20 oversize piston, new rings, gaskets, carb, and muffler, ran great for 12-13 years, carb float bowl full. getting fuel all the way to carb. smokes bad while running. " Muffler stopped up " ??

sho305 · 10-15-2015, 07:56 PM

Plugged muffler will either not have any power, or it will start smoking once it gets hot. If it smokes hot, you run the snot out of it until it stops smoking, then run it easy so it can cool off, it should not have a problem for some time after that because you burned it out. It will make a lot of smoke for maybe 15 min of constantly flooring the gas.

If plugged try running a heavy wire up the tailpipe and see if that helps knock something loose, but that has nothing to do with it smoking. Smoke is from oil in the fuel, either too much oil mixed or too much fuel going in. Providing the smoke is constant whenever it is running cold or hot.

If you burn out the muffler the oil in the muffler is burning, it collects there, and will not happen until it is really hot inside.

1989Marathon · 10-15-2015, 08:07 PM

Quote:

Originally Posted by Fostine Bowen

Want draft fuel into engine, new carb, fuel pump works fine, 70 psi comp. muffler been replaced, spray fuel into carb will run till you stop spraying.Charlie

Quote:

Originally Posted by Fostine Bowen

Engine completely rebuilt 15years ago 20 oversize piston, new rings, gaskets, carb, and muffler, ran great for 12-13 years, carb float bowl full. getting fuel all the way to carb. smokes bad while running. " Muffler stopped up " ??

Are you saying it had a new carb installed 15 years ago? Or was another new carb recently installed?

Is the carb bowl vented properly?
Is the rubber mounting flange for the carb in good shape with no leaks/cracks?

10-13-2015, 07:45 AM	#1
Fostine Bowen Not Yet Wild Join Date: Oct 2015 Posts: 6	Yamaha G1, Gas Want draft fuel into engine, new carb, fuel pump works fine, 70 psi comp. muffler been replaced, spray fuel into carb will run till you stop spraying. Charlie
Fostine Bowen Not Yet Wild Join Date: Oct 2015 Posts: 6

10-13-2015, 06:41 PM	#2
smallblock450sl Sometime's............ Join Date: Oct 2007 Location: Tacoma Washington Posts: 11,874	Re: Yamaha G1, Gas 70 lbs compression (at wide open throttle) is to low. 1979 and up-120 lbs /good, 100 lbs minimum. 1982 115 lbs/good, 90 lbs miniumum.

10-14-2015, 02:36 PM	#3
Fostine Bowen Not Yet Wild Join Date: Oct 2015 Posts: 6	Re: Yamaha G1, Gas Yamaha G1 Gas, Pulled reeds and cleaned both side fit flush, cleaned fuel tank, fuel filter, pump works good, carb full of fuel, 100lbs compression. only runs if spray fuel into carb, however it smokes extremely BAD, eliminated oil injection, mix fuel 100 to one. same results. Muffler was replaced about 12 years ago.
Fostine Bowen Not Yet Wild Join Date: Oct 2015 Posts: 6

10-14-2015, 03:20 PM	#4
Spicyunicorn Gone Wild Join Date: Jun 2015 Location: NW Iowa Posts: 1,669	Re: Yamaha G1, Gas Is the bowl in the carburetor bowl filling up with fuel after running it?

10-14-2015, 04:37 PM	#5
slonomo Searching for The Way Join Date: Oct 2009 Location: Medina, Ohio (NEOHIO) Posts: 11,436	Re: Yamaha G1, Gas Has this engine ever been running good while in your possession?

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10-14-2015, 06:32 PM	#6
Fostine Bowen Not Yet Wild Join Date: Oct 2015 Posts: 6	Re: Yamaha G1, Gas Engine completely rebuilt 15years ago 20 oversize piston, new rings, gaskets, carb, and muffler, ran great for 12-13 years, carb float bowl full. getting fuel all the way to carb. smokes bad while running. " Muffler stopped up " ??
Fostine Bowen Not Yet Wild Join Date: Oct 2015 Posts: 6

10-15-2015, 07:56 PM	#7
sho305 Vegas modded 420 Join Date: Jun 2009 Location: West MI Posts: 15,443	Re: Yamaha G1, Gas Plugged muffler will either not have any power, or it will start smoking once it gets hot. If it smokes hot, you run the snot out of it until it stops smoking, then run it easy so it can cool off, it should not have a problem for some time after that because you burned it out. It will make a lot of smoke for maybe 15 min of constantly flooring the gas. If plugged try running a heavy wire up the tailpipe and see if that helps knock something loose, but that has nothing to do with it smoking. Smoke is from oil in the fuel, either too much oil mixed or too much fuel going in. Providing the smoke is constant whenever it is running cold or hot. If you burn out the muffler the oil in the muffler is burning, it collects there, and will not happen until it is really hot inside.

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