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Thread OP
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Discussion
how do you tighten the slipper on the VMX 450?
I have a Venom VMX 450 that ive added the egyro to, btw it is a huge upgrade. Anyway, it seems like maybe my slipper clutch or something is slipping as when i give it gas the wheel barley moves and if i grab the wheel and give it gas the wheel doesnt spin, just the chain and sprockets and stuff. Any idea where i would tighten it up at? or do you thinki i have a different problem?
Thanks! |
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True Gaz, and by the description he said his chain and sprocket work but not the wheel. Only way that is possible is if the wheel/tire insert was not install correctly somehow.
Something not spinning, here are options to check: 1. slipper on spur gear is loose - tighten nut 2. front sprocket set screw not tight enough - set screw not tight enough on layshaft. 3. pinion gear set screw is loose. 4. There is a pin underneath the slipper, behind the spur gear, its unlikely, but possible it broke. 5. Tire/insert slipping on wheel? Never heard of this but wheel is not put together then. Any of these are like a chain of events, so if one stops, it stops all movement for anything further down the chain. So you figure out where in the tranny you parts are not spinning that will tell you. |
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When your holding the wheel, the chain cant rotate either, and the front sprocket will stay too, so as you tighten the nut on slipper theres no way that would happen unless your front sprocket is loose. Watch the other side of the front layshaft and if your turning that nut clockwise and the shaft is rotating on the left side but the sprocket isnt rotating too, that has either come loose or has stripped off the flat part where set screw sits on.
If it happens this is the case you can either just upgrade the sprocket and layshaft to the mm450 which doesnt use set screws but a pin. I have the old version and I just took a drill and bored into layshaft where set screw sits so it goes futher in than the flat part and it never failed after that. If this isnt the case, back to square one. Your then going to have to start looking deeper into gearbox. Not a lot to these bikes when your in there. |
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He said in the first post that if he holds the wheel it does not spin only the chain & sprockets, if you are holding the back wheel the chain won't turn
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You can also do what Johnny Mc did which also will fix the problem: I have the old version and I just took a drill and bored into layshaft where set screw sits so it goes futher in than the flat part and it never failed after that. OR You can do what Chris (chktm) did and drill out the 3mm set screw hole and tap it to 4mm's and use a 4mm set screw that you can really tighten down much better. If fact Chris likes this fix better than the new pin and shaft set up. If you have the tools that is another option. |
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Last edited by TopDave; Jan 11, 2013 at 05:23 PM.
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Last edited by chktm; Jan 12, 2013 at 08:17 AM.
Reason: Dill
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