Pulleys & Gearing Comparison Discussion
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HDF Community Team
Joined: Sep 2013
Posts: 2,314
Likes: 2,264
From: Wisconsin
Unfortunately the 83595-11 nor any other 30 tooth sprocket will fit the M8. What the mechanic called the input shaft is too small in diameter. Stood there and watched him try to fit it. A possible solution might be if someone would machine and weld an adapter to the 30 tooth sprocket. Until then the best we can get is a 31. My scoot is a 2019 but I would assume all the M8's have the same input shaft. Have not tried to calculate out what the 31/70 will provide as far as a final drive ratio. Certainly its a bump in the right direction. The only other somewhat reasonable option I know of is to convert to a chain. There is also a chain that goes from the engine to transmission but I have not looked into that.
On the pulley if you can find a used 68 from a Sportster that could be a good budget choice as to buying a new pulley. Pretty bummed about no 30 T. Be cool if someone could machine a batch of adapters to fit a 30. But I don't really have any idea about the practicality strength longevity of welding some type of adapter to a cast pulley.
On the pulley if you can find a used 68 from a Sportster that could be a good budget choice as to buying a new pulley. Pretty bummed about no 30 T. Be cool if someone could machine a batch of adapters to fit a 30. But I don't really have any idea about the practicality strength longevity of welding some type of adapter to a cast pulley.
Thread Starter
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HDF Community Team
Joined: Sep 2013
Posts: 2,314
Likes: 2,264
From: Wisconsin
Unfortunately the 83595-11 nor any other 30 tooth sprocket will fit the M8. What the mechanic called the input shaft is too small in diameter. Stood there and watched him try to fit it. A possible solution might be if someone would machine and weld an adapter to the 30 tooth sprocket. Until then the best we can get is a 31. My scoot is a 2019 but I would assume all the M8's have the same input shaft. Have not tried to calculate out what the 31/70 will provide as far as a final drive ratio. Certainly its a bump in the right direction. The only other somewhat reasonable option I know of is to convert to a chain. There is also a chain that goes from the engine to transmission but I have not looked into that.
On the pulley if you can find a used 68 from a Sportster that could be a good budget choice as to buying a new pulley. Pretty bummed about no 30 T. Be cool if someone could machine a batch of adapters to fit a 30. But I don't really have any idea about the practicality strength longevity of welding some type of adapter to a cast pulley.
On the pulley if you can find a used 68 from a Sportster that could be a good budget choice as to buying a new pulley. Pretty bummed about no 30 T. Be cool if someone could machine a batch of adapters to fit a 30. But I don't really have any idea about the practicality strength longevity of welding some type of adapter to a cast pulley.
Road Captain
Joined: Sep 2019
Posts: 689
Likes: 339
From: Dayton OH
I'm not sure what is missing / wrong here but I would be/am glad to find out a 30 will work. I'll get back to the dealership and figure out what is up. Guys been wrenching Harley's for many years and is a well established dyno tuner and does their Harley race motor work.
Elite HDF Member
Joined: Apr 2012
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From: San Diego
I'm not sure what is missing / wrong here but I would be/am glad to find out a 30 will work. I'll get back to the dealership and figure out what is up. Guys been wrenching Harley's for many years and is a well established dyno tuner and does their Harley race motor work.
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HDF Community Team
Joined: Sep 2013
Posts: 2,314
Likes: 2,264
From: Wisconsin
I'm not sure what is missing / wrong here but I would be/am glad to find out a 30 will work. I'll get back to the dealership and figure out what is up. Guys been wrenching Harley's for many years and is a well established dyno tuner and does their Harley race motor work.
There are older 30T sportster sprockets that won't work.
Last edited by Hulkss; Nov 16, 2019 at 06:28 PM.
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HDF Community Team
Joined: Sep 2013
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From: Wisconsin
From Baker Drivetrain: "Optional Cruise Drive Pulleys: Along with the launch of the Cruise Drive transmission on the 2006 Dyna models, the factory started using bigger diameter splines on the output gear. This change made us tool up 2 new pulleys to meet the tuning needs of our performance minded customers. Pulleys are available in 31 and 30 tooth configurations. PN 30T-07 (30 tooth), 31T-07 (31 tooth)"
