HondaATC,
The "powervalve" or "ATAC" system if I remember correctly, was a chamber located on the left side of the cylinder. The system did not operate as designed for the CR, but the cylinder was still a giant improvement over the stock ATC cylinder and anything I was getting from Paul Turner at that time.
Like I mentioned in the previous post, Paul "ported" the cylinder and it made LESS power! Steve Carter then reassembled the top end using ATC rings which were chrome against this cylinder which was also chrome plated or nikasil. It self destructed during a National at Liberal Kansas in 1985.
If these cylinders are run "as is" the port timing is very good. They do not need to be modified if the correct pipe is used. This set-up was very fast when I originally used it.
NOS_350X,
I never looked at it like you mentioned, but yes, the ATC200R's rear axle arrangement was very similar to how a motorcycle rear wheel is designed.
But even the motorcycle doesn't have to have the countersprocket located anywhere different. Kawasaki's and Yamaha 3 wheeler engines will interchange with their motorcycle counter
parts. In fact, Kawasaki 500 and YZ 490-500 engines use the same motor mount sizes and locations so these engines will "bolt in."
I feel if the 3 wheeler era didn't come to the demise that it did, Honda would have brought this design to market on the 250's. The ATC200R was really a "works" 3 wheeler! No question about it! There were a number of re-designed and improved elements on these trikes that no doubt would have trickled down to the production 3 wheelers in the next year or so "if" they hadn't been banned......
Should this thread be moved to Trikesylvania??