Hi Low,
Here's my resurrected beast. At one point I was so bummed
that I started to buy a G.E.B.E.,but after going over the install
requirements & other limitations I found my stays were too narrow
for the kit and a PF4000 likely a bit too much engine.
Sooo...I thought about what had been wrong with my earlier belt
drives. The 1st with 20" rim sheave & gx35 worked fine on the flat
& was fast, but didn't climb. 2nd with the 24" rim had great low end
with the gx, but wanted to slip. So 3rd was with the Pf4000 which
stripped the threads right off the shaft. A single factor was causing
the problems. Because the angle of the belt from pulley to sheave
was obtuse, too much tension on the belt was needed to make it work.
Simple fix, now with the belt encompassing 50% of the pulley it functions
with 1/2 the tension. With my Belleville washer pulley, which compresses
around the belt, I went back to a 20" rim( 15 1/2 dia.) & a 3/4" pulley
for a ratio of 20.6 to 1. With the Tanaka that low enough climb, high
enough to cruise at 30.