GL1000 Tranmission output shaft RPM


Technical information and Q&A applicable to all years and models of Goldwings
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Banzaibob
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Motorcycle: 1984 GL1200A, 2011 BMW R120RT, 1991 BMW R100RT, 1974 Honda CB750, 1977 Harley Davidson XLCR1000, 1959 Triumph TR6, 1971 BSA B50TT Honda FT/XL500, 1974 Suzuki GT750, 1969 Suzuki T350, 1971 Honda CB350 Diesel conversion,

GL1000 Tranmission output shaft RPM

Post by Banzaibob »



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.

Included is a picture of the first.





Banzaibob
Posts: 6
Joined: Mon Mar 06, 2017 9:00 pm
Location: Kansas City, Mo
Motorcycle: 1984 GL1200A, 2011 BMW R120RT, 1991 BMW R100RT, 1974 Honda CB750, 1977 Harley Davidson XLCR1000, 1959 Triumph TR6, 1971 BSA B50TT Honda FT/XL500, 1974 Suzuki GT750, 1969 Suzuki T350, 1971 Honda CB350 Diesel conversion,

Re: GL1000 Tranmission output shaft RPM

Post by Banzaibob »

By the way, engine redline is 3300rpm, max. torque, about 2500rpm (Kubota D902)

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gipsy42
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Re: GL1000 Tranmission output shaft RPM

Post by gipsy42 »

The red line in a GL1000 is around 7.5K, so with such a low RPM probably the 1000 trany wont do much good.
Here are the specs of Gl1000.



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ekvh
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Re: GL1000 Tranmission output shaft RPM

Post by ekvh »

Gl1000 3.40:1
Gl1100. 3.09:1
Gl1200. 2.83:1
Gl1500. 2.83:1

The other factor is tire size.

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.



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