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    RX-1 High RPM Not as much speed as I would expext

    Update, after getting some issues fixed, the sled is running scary strong!!! Still no top end though 1) Didn't understand these four strokes had the additional gear reduction 2) Skid issue's resolved, replaced all bad wheels and bearings 3)New belt, Primary and Secondary Set-up properly and...
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    Modified Rx1 Airbox With Pictures

    Did air box mod to 03 Rx-1, Only could test in big field behind house, trails locally closed, but it was enough of a run to test it out, it ran scary strong, no bog issues. I installed 165 mains, 22.5 Pilots, Silver Holtzman Springs and CR10EK Plugs. I'm spot on with Ulmer Clutch Kit, revs to...
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    RX-1 High RPM Not as much speed as I would expext

    Update, first of all, I agree a gear change is one mod I want to do in the future, one change at a time though, cleaning the primary and setting the secondary back to 70 deg, I found something interesting, when I measured the secondary sheave distance at the top it was only 3.15, not the 3.8 to...
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    RX-1 High RPM Not as much speed as I would expext

    First of all thanks to all who have responded to my posts, I learned a lot, I didn't realize their was additional gear reduction, limiting clutch rpm, next run will be this weekend, going to clean primary, new belt, probably go to 70 deg wrap as original set-up by Ulmer, question if original...
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    RX-1 High RPM Not as much speed as I would expext

    Update and FYI, I also am running 40mph at 7000 rpm, and 13-14mpg, Had to clean primary due to dirt, debris??, Went back to white spring 3-3, kit wants 6-1 setting, however blew belt in next 40 miles, I'm starting to think I had belt issues all along which would explain a lot, missing basics...
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    RX-1 High RPM Not as much speed as I would expext

    Current set-up, STM arms Heel 4-1, Mid 0, Tip 2 ,White sec spring 6-1 Wrap, Do I really just need more tip weight? Am I thinking about this all wrong when you suggest more heel weight?? I need to amend above statement, Mid season last year changed to aftermarket silver spring equivalent 6-1...
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    RX-1 High RPM Not as much speed as I would expext

    Yes, I can hold 10500 rpm no problem, Again I changed clutching to make sled more aggressive for the occasional drift run along the trail, the 03 factory clutching pretty lazy however the newer curved primary arms and adjustable weights made the sled aggressive, but itseems I'm always running...
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    RX-1 High RPM Not as much speed as I would expext

    :4STroke: Purchased 03 Rx-1 low miles on it, as far as I know no mods, Played with clutching, tried Heavy hitters and Ulmer racing stage 1 kit, Motor runs great, pulls 10500 rpm immediately, tried different secondary springs , helix from Ulmer. Changing primary arms and secondary helix really...


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