G1 engine swap but now what about reverse?

jmottr01 · 03-19-2011, 11:07 PM

Okay, I am new to the cart world and just bought this cart (1985 G1) for $200. The piston came apart so it wont run. Seems like a perfect time to fit it with MORE POWER!

I want to put in a 550 snowmobile engine but I am not sure if I will maintain reverse since it seems that in this cart the electronics reverse the engine to control direction. Please tell me if I am way off base since the cart never ran. I just dont see a mechanical option in it to change the direction.

chuddly · 03-20-2011, 05:25 AM

you are right...you would have to change the rear end to a 4 stroke cart rear end to do what you are wanting. UNLESS you went with a Yamaha Bravo snowmobile engine because they can run in reverse and most all of the G1's electronics will fit on it.

Now that being said the stock power on a G1 isnt bad and they are DIRT CHEAP to rebuild. You might think about rebuilding it for now and then down the road doing a engine swap.

jmottr01 · 03-20-2011, 09:03 AM

Okay, if I do decide to rebuild this one will I have any issues if I use an oversized piston? I am in AZ and I am concerned about overheating. Or should I just order standard with a new jug since the piston scored mine up pretty good.

kcnaz · 03-20-2011, 09:38 AM

Rebuild the top end.......its a piece of cake. This will give you a chance to clean it all up and make sure you don't have any debris that would cause your over heating. Not that you have to worry about that anyway....

chuddly · 03-20-2011, 10:10 AM

just order a stock rebuild kit. It come with new jug and all and you can be up and going quick. Might want to think about doing crank shaft seals at the same time while your in there because the G1 if it leaks from there will run BAD

sho305 · 03-20-2011, 06:55 PM

If the piston broke make sure you flush the case good and verify all the crank bearings are ok. Jug and piston is cheap, just get that. A new bore is the only way to get full power to an old 2 stroke. If you really want to, you can dig up a sled that reverses that way, lots of skidoo reverse via ignition and some others. Yes the bravo is a 250 but more power, especially if you leave the pipe on it, and you can fit the G1 crank trigger to it. Otherwise you can find a G2/9 rear and it will fit with minimal mods, then you have a reverse gear and can use any engine.

jmottr01 · 03-20-2011, 07:10 PM

Okay, I started pulling apart my engine for further inspection and I got the clutch off and all the plastics (HUGE mound of oil caked mud, no air getting to the poor thing at all I woulda let go too.) and now I am down to a drum on one side and the starter pulley on the other. Are both of these just pressed on?

sho305 · 03-20-2011, 07:22 PM

The pulley is part of the clutch, you need a bolt type puller that goes in the center hole or make one...that is only way they come off. Look on a cart site they have photos of them its just a long bolt. The other side is flywheel with the fan on it? That should come off with a regular puller like any small engine. They are both in crank with a taper, you have to use a puller. Only time they fall off is if it was just off lately.

03-19-2011, 11:07 PM	#1
jmottr01 Not Yet Wild Join Date: Mar 2011 Location: Phoenix Az Posts: 22	G1 engine swap but now what about reverse? Okay, I am new to the cart world and just bought this cart (1985 G1) for $200. The piston came apart so it wont run. Seems like a perfect time to fit it with MORE POWER! I want to put in a 550 snowmobile engine but I am not sure if I will maintain reverse since it seems that in this cart the electronics reverse the engine to control direction. Please tell me if I am way off base since the cart never ran. I just dont see a mechanical option in it to change the direction.

03-20-2011, 05:25 AM	#2
chuddly Gone Wild Join Date: Mar 2010 Location: Eminence, IN Posts: 534	Re: G1 engine swap but now what about reverse? you are right...you would have to change the rear end to a 4 stroke cart rear end to do what you are wanting. UNLESS you went with a Yamaha Bravo snowmobile engine because they can run in reverse and most all of the G1's electronics will fit on it. Now that being said the stock power on a G1 isnt bad and they are DIRT CHEAP to rebuild. You might think about rebuilding it for now and then down the road doing a engine swap.

03-20-2011, 09:03 AM	#3
jmottr01 Not Yet Wild Join Date: Mar 2011 Location: Phoenix Az Posts: 22	Re: G1 engine swap but now what about reverse? Okay, if I do decide to rebuild this one will I have any issues if I use an oversized piston? I am in AZ and I am concerned about overheating. Or should I just order standard with a new jug since the piston scored mine up pretty good.

03-20-2011, 09:38 AM	#4
kcnaz Gone Wild Join Date: Apr 2010 Location: Southern Arizona Posts: 287	Re: G1 engine swap but now what about reverse? Rebuild the top end.......its a piece of cake. This will give you a chance to clean it all up and make sure you don't have any debris that would cause your over heating. Not that you have to worry about that anyway....

03-20-2011, 10:10 AM	#5
chuddly Gone Wild Join Date: Mar 2010 Location: Eminence, IN Posts: 534	Re: G1 engine swap but now what about reverse? just order a stock rebuild kit. It come with new jug and all and you can be up and going quick. Might want to think about doing crank shaft seals at the same time while your in there because the G1 if it leaks from there will run BAD

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03-20-2011, 06:55 PM	#6
sho305 Vegas modded 420 Join Date: Jun 2009 Location: West MI Posts: 15,443	Re: G1 engine swap but now what about reverse? If the piston broke make sure you flush the case good and verify all the crank bearings are ok. Jug and piston is cheap, just get that. A new bore is the only way to get full power to an old 2 stroke. If you really want to, you can dig up a sled that reverses that way, lots of skidoo reverse via ignition and some others. Yes the bravo is a 250 but more power, especially if you leave the pipe on it, and you can fit the G1 crank trigger to it. Otherwise you can find a G2/9 rear and it will fit with minimal mods, then you have a reverse gear and can use any engine.

03-20-2011, 07:10 PM	#7
jmottr01 Not Yet Wild Join Date: Mar 2011 Location: Phoenix Az Posts: 22	Re: G1 engine swap but now what about reverse? Okay, I started pulling apart my engine for further inspection and I got the clutch off and all the plastics (HUGE mound of oil caked mud, no air getting to the poor thing at all I woulda let go too.) and now I am down to a drum on one side and the starter pulley on the other. Are both of these just pressed on?

03-20-2011, 07:22 PM	#8
sho305 Vegas modded 420 Join Date: Jun 2009 Location: West MI Posts: 15,443	Re: G1 engine swap but now what about reverse? The pulley is part of the clutch, you need a bolt type puller that goes in the center hole or make one...that is only way they come off. Look on a cart site they have photos of them its just a long bolt. The other side is flywheel with the fan on it? That should come off with a regular puller like any small engine. They are both in crank with a taper, you have to use a puller. Only time they fall off is if it was just off lately.

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