Recent content by greenhuman

Here's my latest mod. Horizontal, air cooled, standard at 223cc. CRF230

Bore x bore .7854 x stroke = cc's

None of the heads you mentioned will fit the Postie110. Don't worry about the gearbox etc letting go. I used to modify the ATC90's out to 320cc using XL175 top ends with no bottom end problems.

The 110 postie has a different bolt pattern as in engine mounts, in fact they are nothing like the engines in pit bikes, completely different design.

You can make a hollow brass bushing or tube that goes on the top of the carb slide and limits the amount the throttle can be opened.

The Atomik is push rod, that's why they make no power.

With the ATC 70 trike, 2 inches in the frame is needed, so something similar with the Pit Bikes, I suppose. They weigh 30kg and it is modified from a stand up design to a lay down. The chain lines up and pegs from an ATC 90 bolt up. Track and Trail in Newcastle have fitted one of my engines to a...

How does this mod grab you? 200cc. 2 inches longer and 1 inch wider than a 125 engine.

It has been my experience that stroking makes a lot more HP than boring. 25% more HP with a stroker crank over a big bore to the same cc's.