The idler kit for th
ese cheap motorbike kits is pretty lame. Notice the clamp that grabs the chainstay and the slot the idler pully has to move up to tension the chain. This setup seems to let the chain loosen up after about 5 minutes of riding time. The nylon pulley is probably not nearly as satisfactory as an idler sprocket would be but that upgrade will have to wait for later. My current effort has been centered around the mounting and adjustment portions of the idler system.
ese cheap motorbike kits is pretty lame. Notice the clamp that grabs the chainstay and the slot the idler pully has to move up to tension the chain. This setup seems to let the chain loosen up after about 5 minutes of riding time. The nylon pulley is probably not nearly as satisfactory as an idler sprocket would be but that upgrade will have to wait for later. My current effort has been centered around the mounting and adjustment portions of the idler system.
Here is what I came up with. The new unit uses a swing arm pivoted from the bottom rather than a slot for moving the pully against the chain. Note the welded on tab on the chainstay and on the seatstay where an adjustment screw can be hand tightend and then locked with a wingnut to pull the chain into the desired tension. I'm thinking that having the tensioner setable without tools will enable the chain to be removed from the sprocket out on the road, making the bike much easier to roll back home should the motor quit (hope for the best, plan for the worst).
No comments:
Post a Comment