Mike's 2 speed concept is really nothing new since 2 speed minibikes have been around since the 60's but the idea is well worth taking a look at. Another cool aspect of Mikes set-up is he has been able to assemble it with 'true' vintage parts from the 60's also.
What Mike did was he took a Mc-91 and bolted it onto a Palmini jackshaft mount then installed a motor clutch with 2 sprockets to drive a one way sprocket and a clutch on the jackshaft with a sprocket then going to the final drive at the rear wheel.
Currently the set-up is still in the testing stages with different engagement speeds on the clutches and ratios being tested but the results look promising with the initial set up featuring a 12:1 first ratio shifting into a 6:1 final ratio.
Only some time and some tuning will tell if the set-up is viable but no matter what its a very interesting concept and set upas the pictures below will show.



R.E.A.R.