This chapter is about the Hi-Low range transmission on the Super Blazer. The design used is a simple, but somewhat complex solution that a small machine shop would be able to reproduce without casting a gearbox housing. It is all done with sprockets and chains and some machined parts. Anyway, I believe the operating principle is a version of a “Sliding Dog Clutch”. At the bottom is a photo of the dissembled 2nd jack-shaft (The brake drum is mounted to the left of the bike looking forward, see other photos). The jack-shaft is hollow with a machined part that fits inside. A pulley is connected by a pin that connects to the inside machined part, thru the machined slots on the shaft. The arm of the gear shift lever operates the pulley to move the pulley from side to side (The pulley turns with the shaft, but the shift arm rides in the pulley grove). Now, there are two sprockets, a small sprocket (High Gear) and a large sprocket (Low gear). The sprockets have oilite press in bearings that fit and rotate on the shaft. On the 1st jack-shaft there is a dual small sprocket with two chains to the upper two sprockets on the 2nd jack-shaft. When the engine is running, and primary Driver is turning, the two upper small and large sprockets are both turning, but at different speeds. The trick is to engage only one the the sprockets at a time to the 2nd jack-shaft. This is done by the sliding machined part inside the hollow shaft programs or pushes up 4 steel balls thru 4 holes each for each gear, locking only one gear at a time to the shaft, or no gear (Neutral). On the operator gear shift, there are 3 positions. Down=Low gear, Middle=Neutral, Up=High gear. Here are some additional specifications: 1st jack-shaft sprocket=dual 14 teeth, #40 chain to 2nd jack-shaft Low gear=45 teeth, High gear=22 teeth, output sprocket to rear wheel=11 teeth, #50 chain to rear wheel=40 teeth. Doing the math, overall gear ratio 1st jack-shaft to rear wheel, Hi gear=5.3, Low gear=10.9