The question: What is the rpm of your typical GL1000/1100/1200 transmission output shaft at approximately 60-70 mph? What is the reduction ratio of the typical final drive?
The reason I'm asking: I'm working on my 2nd diesel motorcycle. My first, I was able to use a 5 speed manual gearbox from a Honda CB350, basically using the stock clutch driven by a 2" toothed belt and pulley system. Given the nature of slow turning diesels and the high turning nature of gas engines, I had to compute my primary pulley ratios pretty low. I'm probably going to use a GL1000 final drive but instead of a manual trans I'm going to use a CVT out of a snowmobile or ATV. I therefore need the secondary shaft to spin at whatever will drive a Goldwing down the highway at about 70 mph.
1000’s came with a 17” rear tire
1100’s came with 17” in 80-81 and 16” in 83 (can’t recall 82)
1200’s came with a 15”
1500s which can be used with a 1200 swingarm had a 16”x 3.5” rim.
Using a 75 car tire on the 16” 1500 rim would give the best gearing. I have a 195/65/16 and it fits a 1200 swingarm with mods. A 75 would be 27.5” tall.
At 2500 rpm you’ll be doing a shade over 50mph, I think, with a tall tire and a 1500 final drive. With the 1000 final drive it would be considerably less, maybe 40 mph. It could be helped if you find an 18” Lester, rarer but out there. It had a 3” rim and will safely accommodate a 150 width tire.
You’ll need a pretty decent reduction to keep rpm down.
Sounds like fun. I’ve thought about it for a while now too. Hope you share what you’re doing.
