1985 G1 does not rev to max rpm

sick1166 · 03-06-2015, 01:38 PM

put new starter new fuel pump new carb and new belts
before changing all for new parts the cart reved and ran fast now with new parts does not seem to really go at wot moves good but does not spin the tires in gravel like before changes?

changed starter because of broken bolt where the starter wire hooked up
replaced fuel pump and carb due to old carb and just not adjusting right

TheGDFP · 03-06-2015, 02:50 PM

Try swapping old carb back on?
Confirmed no air leaks?

sick1166 · 03-06-2015, 03:21 PM

the old carb just pumps gas out vent .Cleaned 5 times and reset jets and float seems not to work

raydhd · 03-06-2015, 06:49 PM

Does the float float?

sick1166 · 03-06-2015, 08:35 PM

yes the float floats

slonomo · 03-07-2015, 08:22 AM

Quote:

Originally Posted by sick1166

the old carb just pumps gas out vent .Cleaned 5 times and reset jets and float seems not to work

I thought it revved and threw gravel?

sick1166 · 03-07-2015, 11:32 AM

yes I put a new muffler and rebuilt top end a month ago and ran like new and then a few days ago it started to bog down and run rough on start up so replaced the fuel lines and vacuum line and fuel pump ran good for 2 days then started pumping gas out carb vent and not running cleaned carb several times to no avail so put a new one on with a new drive belt after 25 years figured it was time for some new parts

smallblock450sl · 03-07-2015, 12:08 PM

Does the exhaust valve and linkage open all the way at wide open throttle?

sho305 · 03-07-2015, 12:43 PM

New carb may not be jetted the same. New carb may have leak but leaks usually have less affect at WOT than lower throttle. New pump may put more pressure on float could try new float valve and float in old carb should fix that. Can also try longer/larger pulse line that will reduce the signal to the pump and reduce pumping pressure. Could read plug and re-jet the new carb. Those are my best guesses.

slonomo · 03-07-2015, 01:10 PM

Not much to go wrong in the G1 carb. If you have the orig carb it will be better quality than the China versions. Pretty much a float, needle/seat, and jets. If all the jets are clear and clean, and the float is not cracked, and the needle is in good cond, it should work better than any aftermarket version.

I'd pull that thing apart and soak it in some warm soapy water. Get the brush out and do some scrubbing to get the dirt off. Rinse and soak again. Rinse well. Lay it out on a towel to dry overnight, blow a fan on it. Use carb cleaner on the jets, never use compressed air. Reassemble and install.

I've done this on 3 G1 carbs, 1 G2 carb, weed eaters, chain saws, blowers, mowers, etc. Works great.

The only thing that will cause the carb to overflow is a bad float or a pump that has too much pressure. The G1 fuel pump is very low pressure 1-2 psi, barely pumps in my opinion, but it doesn't take much to fill that tiny bowl. Just barely over gravity feed. Gravity feed will flow more.

Try the old carb after it's clean and dry. Can you post a video?

03-06-2015, 01:38 PM	#1
sick1166 Getting Wild Join Date: Sep 2008 Posts: 99	1985 G1 does not rev to max rpm put new starter new fuel pump new carb and new belts before changing all for new parts the cart reved and ran fast now with new parts does not seem to really go at wot moves good but does not spin the tires in gravel like before changes? changed starter because of broken bolt where the starter wire hooked up replaced fuel pump and carb due to old carb and just not adjusting right
sick1166 Getting Wild Join Date: Sep 2008 Posts: 99

03-06-2015, 02:50 PM	#2
TheGDFP Gone Wild Join Date: Apr 2014 Location: Flint, MI, USA Posts: 656	Re: 1985 G1 does not rev to max rpm Try swapping old carb back on? Confirmed no air leaks?

03-06-2015, 03:21 PM	#3
sick1166 Getting Wild Join Date: Sep 2008 Posts: 99	Re: 1985 G1 does not rev to max rpm the old carb just pumps gas out vent .Cleaned 5 times and reset jets and float seems not to work
sick1166 Getting Wild Join Date: Sep 2008 Posts: 99

03-06-2015, 06:49 PM	#4
raydhd VC 460 CLONE GONE WILD Join Date: Oct 2014 Location: Ray BY The Bay NJ Posts: 10,633	Re: 1985 G1 does not rev to max rpm Does the float float?

03-06-2015, 08:35 PM	#5
sick1166 Getting Wild Join Date: Sep 2008 Posts: 99	Re: 1985 G1 does not rev to max rpm yes the float floats
sick1166 Getting Wild Join Date: Sep 2008 Posts: 99

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03-07-2015, 11:32 AM	#7
sick1166 Getting Wild Join Date: Sep 2008 Posts: 99	Re: 1985 G1 does not rev to max rpm yes I put a new muffler and rebuilt top end a month ago and ran like new and then a few days ago it started to bog down and run rough on start up so replaced the fuel lines and vacuum line and fuel pump ran good for 2 days then started pumping gas out carb vent and not running cleaned carb several times to no avail so put a new one on with a new drive belt after 25 years figured it was time for some new parts
sick1166 Getting Wild Join Date: Sep 2008 Posts: 99

03-07-2015, 12:08 PM	#8
smallblock450sl Sometime's............ Join Date: Oct 2007 Location: Tacoma Washington Posts: 11,874	Re: 1985 G1 does not rev to max rpm Does the exhaust valve and linkage open all the way at wide open throttle?

03-07-2015, 12:43 PM	#9
sho305 Vegas modded 420 Join Date: Jun 2009 Location: West MI Posts: 15,443	Re: 1985 G1 does not rev to max rpm New carb may not be jetted the same. New carb may have leak but leaks usually have less affect at WOT than lower throttle. New pump may put more pressure on float could try new float valve and float in old carb should fix that. Can also try longer/larger pulse line that will reduce the signal to the pump and reduce pumping pressure. Could read plug and re-jet the new carb. Those are my best guesses.

03-07-2015, 01:10 PM	#10
slonomo Searching for The Way Join Date: Oct 2009 Location: Medina, Ohio (NEOHIO) Posts: 11,436	Re: 1985 G1 does not rev to max rpm Not much to go wrong in the G1 carb. If you have the orig carb it will be better quality than the China versions. Pretty much a float, needle/seat, and jets. If all the jets are clear and clean, and the float is not cracked, and the needle is in good cond, it should work better than any aftermarket version. I'd pull that thing apart and soak it in some warm soapy water. Get the brush out and do some scrubbing to get the dirt off. Rinse and soak again. Rinse well. Lay it out on a towel to dry overnight, blow a fan on it. Use carb cleaner on the jets, never use compressed air. Reassemble and install. I've done this on 3 G1 carbs, 1 G2 carb, weed eaters, chain saws, blowers, mowers, etc. Works great. The only thing that will cause the carb to overflow is a bad float or a pump that has too much pressure. The G1 fuel pump is very low pressure 1-2 psi, barely pumps in my opinion, but it doesn't take much to fill that tiny bowl. Just barely over gravity feed. Gravity feed will flow more. Try the old carb after it's clean and dry. Can you post a video?

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