Just thought I'd share this idea.....
I just put a 4.0 hp Subaru Robin engine on one of my baja mini bikes. I didn't slot the engine mount holes and found that I didn't have the chain tensioning adjustability that I wanted. I decided to go to a larger diameter chain tensioner to give me this flexibility. I found that skateboard or rollerskate wheels work great (they even have bearings) in place of the stock black roller.....my only other advice is to try to avoid some of the softer skateboard wheels.....harder is better.....also, you can put a huge washer in front and back of the wheel to help keep the chain on the new tensioner.....
I just put a 4.0 hp Subaru Robin engine on one of my baja mini bikes. I didn't slot the engine mount holes and found that I didn't have the chain tensioning adjustability that I wanted. I decided to go to a larger diameter chain tensioner to give me this flexibility. I found that skateboard or rollerskate wheels work great (they even have bearings) in place of the stock black roller.....my only other advice is to try to avoid some of the softer skateboard wheels.....harder is better.....also, you can put a huge washer in front and back of the wheel to help keep the chain on the new tensioner.....