CM400A EV Conversion

1980 CM400A
Purchase price $100

(Just Sold!)

September 11 2006 A simple conversion planned, as this is my first one. Here's what I've got so far: -Briggs & Stratton Etek DC Motor and Alltrax controller kit, from Cloud Electric -Exide Orbitals, 34XCD, pulled from the VW when it was sold -power supply, for charging -CM400A -sprocket - rear - Sprocket Specialists -sprocket - front - Wallace Machine The bike's been stripped, painted, and the battery cage constructed. I made it with 1 1/4" wide 1/8" thick steel Ls bolted in place with 1/4" cat 5 steel bolts, and 5/16" steel bolts to hold it to the frame. The cm400 does not have a full front frame - I've been told the motor itself added to the stability of the frame. To help compensate I bolted two L's side by side from the front to the rear motor mounts. If the bike doesn't split in 2 I guess it'll've worked. The rear sprocket has 74 teeth, the front 15, for a ratio of 5:1. I have no idea how this will drive, but with 74 teeth on the back there's some room for playing around with the front gear. I had intended to put a 2-speed transmission on the bike - using sprag and electric clutches (idea from Bad Fish Racing), but there's not a lot of space on the smaller 400 frame. The alternative was a cvt clutch (like the EZE), but I thought I'd give direct drive a try as the bike is small and I just intend to drive it around town. My only concern about the conversion at this point is an easy form of emergency cutoff. I'll have a physical key disconnect inserted in the high-power circuit, but I'd prefer something quicker like a motorcycle clutch. Close up of the CM4 twin engine - well cared for on the inside. Open to offers   0-5K Pot

The bare frame, and a coat of paint The battery cage - 1 1/4" 1/8" thick steel Ls bolted together. If I can't get the bike working I'll frame the sprocket.