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Big Block Talk! Everything about swapping a big block engine into your cart!



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Unread 04-06-2009, 03:29 PM   #1
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Default Bike motor in cart now big problem

I got my bike motor in and I must have done the math wrong or forgot about tire size on something because it is to slow to even drive. In 6th gear at about 9k RPM im doing maybe 15 MPH (but it feels like I could pull a house down). The engine has the stock 16-tooth sprocket and the stock Yamaha G1rearend also has a 16 tooth. Is there anyway to switch the gears in the rear end around or something? Do they make a high-speed gear for the G1?
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Unread 04-06-2009, 03:38 PM   #2
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Default Re: Bike motor in cart now big problem

You need to upsize the sprocket on the rearend.
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Unread 04-06-2009, 03:44 PM   #3
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Default Re: Bike motor in cart now big problem

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Originally Posted by Otter70 View Post
You need to upsize the sprocket on the rearend.
That would slow me down even more
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Unread 04-06-2009, 03:47 PM   #4
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Default Re: Bike motor in cart now big problem

your right I'm thinking backwards....sorry
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Unread 04-06-2009, 03:47 PM   #5
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Default Re: Bike motor in cart now big problem

Otter70, actually you have it backwards, placing a larger sprocket on the rear would actually slow the cart down even more. If this were the case, for every complete rotation of the driving gear, the follower gear (rear end) would only make a fraction of a rotation. As of now, the two gears are identical in size, thus the actual speed coming out of engine on the drive shaft is the same as the speed going into the gear box of the cart. In order to make the cart faster, you have to have a larger gear on the drive shaft, so for every turn of the larger gear the smaller gear would have already completed a couple rotations. It doesn't look though as if you have room to place a larger gear on the drive shaft. Unfortunately I do not believe they make high speed gears for the G1.
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Unread 04-06-2009, 03:49 PM   #6
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Default Re: Bike motor in cart now big problem

i think your going to have to run a jackshaft
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Unread 04-06-2009, 04:12 PM   #7
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Default Re: Bike motor in cart now big problem

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i think your going to have to run a jackshaft
i thought of that but with the two sprockets lining up and that close together a jackshaft wont fit.
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Unread 04-06-2009, 06:29 PM   #8
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Default Re: Bike motor in cart now big problem

you should enter that in some of these golf cart pulls they are having. you could have a full pull with the set up you have now any ways i went through what you are doing right now a few years back. mine would do 9 mph in 6 gear i took the rear end out and run a live axle the best move i ever made and a lot less time and headaches
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Unread 04-06-2009, 07:24 PM   #9
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Default Re: Bike motor in cart now big problem

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Originally Posted by groundpounder View Post
you should enter that in some of these golf cart pulls they are having. you could have a full pull with the set up you have now any ways i went through what you are doing right now a few years back. mine would do 9 mph in 6 gear i took the rear end out and run a live axle the best move i ever made and a lot less time and headaches
you know what, your right thats what ill do, how does it do with no diff. ? hard to drive on pavment? thanks for the replies.
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Unread 04-06-2009, 07:30 PM   #10
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Default Re: Bike motor in cart now big problem

about the same as an atv
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