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    Re: Offroad Cushman Truckster
    #11
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    I took the clutches apart, drive clutch has the blue/green spring which from what i've seen is 110lb and the second lightest other than the black spring at 75lb. The weights are stamped 16 I'll weigh them tomorrom. I found an article at work today that said to use the black spring and some heavier weights they listed but of course it's on my computer so I'll look tomorrow. The driven clutch has a red spring and was in setting 2-2 which is the second stiffest setting, I changed it to the softest and got more movement but I think it still needs a softer spring to work right, I haven't found much information on that

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    Re: Offroad Cushman Truckster
    #12
    Duck in a Tux jimmyg's Avatar
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    Looks like your on it.
    All dressed up and waiting for the beer to arrive.
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    Re: Offroad Cushman Truckster
    #13
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    current weights are 42.5 grams each, I'm struggling to find parts, anyone got any polaris clutch parts laying around?
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    Re: Offroad Cushman Truckster
    #14
    Senior Member darwinpayne2000's Avatar
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    A Lifan 420 would be roughly equivalent to a Trailboss 325. The blue/green driver spring should be fine. On the driven clutch, the Trailboss 325 uses a black spring, but you could probably also use a silver spring. A red spring is better if you're pushing 30+ horsepower.

    No fun looking for parts. However, I took a quick peek and ebay has several black driven clutch springs for about $20.

    The clutch weights mostly affect downshifting. Forty-two gram weights should be okay, but you could look for some heavier weights. The Trailboss 325 uses 10RH weights, but I can't find anything that states the grams. However, I'm guessing that they're close to what you already have.

    I'm sure you've already removed the governor, but you can also shim the valve springs with a 1/16 inch copper washer. That will increase the rpm's and the horsepower a bit but not enough to cause problems. My old Vanguard engine ran better after I shimmed the valves.
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    Re: Offroad Cushman Truckster
    #15
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    I am Actually not removing the governor, this thing is for utility so I'm hoping I can get away with just leaving it alone, Also these newer engines have a rev limiter built in so removing the governor requires an aftermarket coil. I cant find anything on the 10RH either, from what Ive read heavier weights or a lighter spring help the clutch shift out earlier. I did find some 66 gram weights for cheap so I'm thinking about trying them, not really sure how big or small of a jump make a difference. I found a Polaris Baja sae site that states:
    How can I tune the P90 clutch for the low power and engagement of the 10hp B&S engine?
    Our drive clutch (#1322920) is designed for 3600 rpm when used with the black spring (#7041022), or lighter, and the S94 weights (#5631434). This is essentially the same drive clutch we have offered in the past, but with wide rollers to accommodate the large weights. We aren't sure how it will work, but it should be considerably better than our old clutches. In the past, many teams have good luck with the D80 weights, a light drive spring (black), and the light driven spring (red). Custom weights anybody? Let us know what works for you!

    I cant find any information on the weight of the s-94 weights and they are also the same price for one as the 66's are for 3, so I think I might try the 66 gram and see how it reacts. I have only found one of those black drive springs and its $45, still contemplating weather i should do it or not.
    That article also mentions d80 weights which I'm seeing are from a diesel engine and based on most of their naming are probably 80 grams, That might be the way to go seeing as diesels dont rev high
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    Re: Offroad Cushman Truckster
    #16
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    I would recommend getting the book "Clutch tuning Hand book" authored by Olav AAen's. It helped me alot in understanding a CVT system when I first got into them. If memory serves me, I got mine off Amazon
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    Re: Offroad Cushman Truckster
    #17
    Senior Member darwinpayne2000's Avatar
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    The Polaris part number for the black spring is 7041782. Yeah, when I search on ebay, it comes back with springs costing around the $45 range. Ouch!! The black spring I was looking at is an EPI spring for a Kawasaki. It's probably compatible, but . . . maybe not.

    Heavier weights with the blue/green spring will lower the engagement speed. The driven clutch spring mostly affects upshift downshift. Heavier weights will make it quicker to upshift and slower to downshift. For a Cushman, this is probably fine. It's not like you're racing it.

    Clutches are infinitely tunable, but it takes an infinity amount of time to get it right.
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    Re: Offroad Cushman Truckster
    #18
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    ok so what I'm seeing with that part number is that it is just a little bit stiffer than the red spring that I already have, that will make the driven clutch shift slower correct? I think my plan for now is to leave the driven alone other than adjusting the positioning of the spring. I researched the diesel atv that those weights come from and those engines only rev out to about 3600 rpm, very similar to a stock 420, so ill be trying those weights out with the stock blue/green spring and we will see how it goes from there. now for the week wait for parts to show up.
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    Re: Offroad Cushman Truckster
    #19
    Senior Member darwinpayne2000's Avatar
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    On the Lifan engine, I assume you're using one of those tapered-to-1-inch shaft adapters? I'm curious to see how that works out.
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    Re: Offroad Cushman Truckster
    #20
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    Yes I am, I'm curious as well, hopefully it holds up I've seen lots of golf cart swap guys use it
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