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    Re: 2 Seat XTC with Yamaha RX1 Engine
    #11
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    More information
    The stock RX1 chaincase has 24 38 gears which gives a 1.58 reduction the sprockets I am using are 10 and 46 teeth for a combined jackshaft to buggy axle of 7.3

    I also calculated how this compared to the snowmobile and determined that using the stock 24 38 gearing, the track moves the sled 22.2 inches per revolution of the track drive shaft.

    With the 24 38 and 46 10 sprockets with a 30 inch tire each revolution of the track drive shaft will move the buggy 20.5 inches, which would mean the buggy is geared about 10% lower than the sled.

    That still seemed too high of gearing to me so I ordered an 18T top gear for the chaincase which will give me 38 18 or 2.11 reduction with 46 10 gives a combined 9.7 or if I go up to 46 12 combined would be 8.1 . I am worried that the 10 tooth chain sprocket is too small and the chain may slip so that's why I thought of going up to the 12.

    I plan to weigh the buggy later this week too, I suspect its a couple hundred pound heavier than the sled.

    Update: I used the 38 18 and 46 12 and the tire I have is 29.25" so for each revolution of the track drive shaft the buggy moves 23.9" so I am geared slightly higher than the snowmobile.
    Last edited by Turbotom; 04-07-2020 at 09:08 AM.
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    Re: 2 Seat XTC with Yamaha RX1 Engine
    #12
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    I took it for its first ride yesterday, ran pretty good.

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    Re: 2 Seat XTC with Yamaha RX1 Engine
     

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    Re: 2 Seat XTC with Yamaha RX1 Engine
    #14
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    RPM vs Tq RX1.jpg
    Here is HP and torque from the new engine I installed 1000 cc 4 stroke compared to the 670 cc 2 stroke I took out
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    Re: 2 Seat XTC with Yamaha RX1 Engine
    #15
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    nice upgrade
    Marine Veteran Sgt USMC 8151/8541 1992-2000
    Process Improvement Specialist Miller Electric MFG LLC
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