Chain guides/tentioners

brec- I don't know if it'll work for your application, but I don't use any type of tensioner or guide. It takes some tinkering to get it just right, but then you have one less component to worry about... just a thought.
Good luck!
Trey

this one is the nicest I found so far.

http://www.treefortbikes.com/produc...nsioner.html?gclid=CLXu0IeSl8MCFQaDfgodoz8AhA

Wouldn't last 5 minutes mounted like that. Too much torque on the bolt from too long an arm.
You want something more like a motorcycle design with delrin slider plates or a heavy-duty roller and mount. A Morini is substantially more powerful than a chinadoll.
Something like this:

maniac- Would you say that a tensioner of some kind is necessary with the stronger motors? I'm filling my mental files...

Thanks.

bet ya a dollar that the hardened alloy and uber hard rubber roller with the sealed bearings will hold up substantially longer than 5-minutes. as a simple tensioner, it will eat a morini for lunch... Unless you are silly enough to run the power side of the chain over it, that sucker will last indefinitely. The pulling side of the chain with all the radical power shouldn't be affecting the 'tensioner'. The arm is more than 1/4 inch thick and setup gets me past 40 mph