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Pulley swap

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Old Mar 29, 2019 | 04:12 PM
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Originally Posted by HOTLAP
Ah yes, my mistake, I thought you were talking about the front belt sprocket not the front primary chain sprocket.
Its just a different way of lowering the cruising speed . I cruise at 3400 rpm at 70 instead of 4000 rpm.
 
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Old Apr 1, 2019 | 08:08 AM
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Originally Posted by HOTLAP
Ah yes, my mistake, I thought you were talking about the front belt sprocket not the front primary chain sprocket.
Well, the OP was talking about the drive belt pulleys I believe.

Somewhere this train went off the track.
 
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Old Apr 1, 2019 | 10:17 PM
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OK so my question is the opposite of OP. I have a 2016 48 nad I want more power off the line. I don't mind some vibes at high speeds because I rarely do high speed. My riding is around town during the week and on secondary highways on the weekends. Those roads have 55 limit so I try to keep it at 60 max. How many teeth would I need to decrease the front pulley to actually feel an increase in power? Also a reduction in front pulley size would increase the wear on that pulley so bearing that in mind what does anyone suggest?
 
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Old Apr 2, 2019 | 06:22 AM
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Originally Posted by kuri77
OK so my question is the opposite of OP. I have a 2016 48 nad I want more power off the line. I don't mind some vibes at high speeds because I rarely do high speed. My riding is around town during the week and on secondary highways on the weekends. Those roads have 55 limit so I try to keep it at 60 max. How many teeth would I need to decrease the front pulley to actually feel an increase in power? Also a reduction in front pulley size would increase the wear on that pulley so bearing that in mind what does anyone suggest?
i bought a 28T pulley off eBay. It’s the factory pulley from the 883. I ended up using it to design my own aluminum version so I can sell it to you if you want.

OP - You can have my original 29T pulley if you want it. That should be +1 for you.
 
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Old Apr 2, 2019 | 08:24 AM
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Originally Posted by HOTLAP
Longer primary chain?
yes, bigger sprocket, longer chain needed!
 
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Old Apr 2, 2019 | 09:15 AM
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Originally Posted by nettshubby
yes, bigger sprocket, longer chain needed!
Let's clear this up.

Primary chain has nothing to do with the drive sprockets except that the drive sprocket won't turn without the primary chain doing it's job. It transfers power from the engine's flywheel/crankshaft, to the clutch shell.

If you are looking to change your final drive ratio, you mess with the drive sprockets, front (main) and rear (wheel).
 
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Old Apr 2, 2019 | 01:22 PM
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Changing the primary sprocket changes the final drive ratio, so change the primary sprocket. Bigger = lower cruising RPM and smaller = higher cruising RPM.
  1. Primary Drive Chain, 34/57 ratio, front pully, 29 rear pully 68
  2. Gear Ratios (overall) 1st 10.41
  3. Gear Ratios (overall) 2nd 7.436
  4. Gear Ratios (overall) 3rd 5.531
  5. Gear Ratios (overall) 4th 4.584
  6. Gear Ratios (overall) 5th 3.931
  1. Primary Drive Chain, 38/57 ratio , front pully 29, rear puilly 68.
  2. Gear Ratios (overall) 1st 9.315
  3. Gear Ratios (overall) 2nd 6.653
  4. Gear Ratios (overall) 3rd 4.948
  5. Gear Ratios (overall) 4th 4.102
  6. Gear Ratios (overall) 5th 3.517
 
Last edited by apache snow; Apr 2, 2019 at 02:42 PM.
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Old Apr 3, 2019 | 09:26 AM
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Originally Posted by apache snow
Changing the primary sprocket changes the final drive ratio, so change the primary sprocket. Bigger = lower cruising RPM and smaller = higher cruising RPM.
  1. Primary Drive Chain, 34/57 ratio, front pully, 29 rear pully 68
  2. Gear Ratios (overall) 1st 10.41
  3. Gear Ratios (overall) 2nd 7.436
  4. Gear Ratios (overall) 3rd 5.531
  5. Gear Ratios (overall) 4th 4.584
  6. Gear Ratios (overall) 5th 3.931
  1. Primary Drive Chain, 38/57 ratio , front pully 29, rear puilly 68.
  2. Gear Ratios (overall) 1st 9.315
  3. Gear Ratios (overall) 2nd 6.653
  4. Gear Ratios (overall) 3rd 4.948
  5. Gear Ratios (overall) 4th 4.102
  6. Gear Ratios (overall) 5th 3.517
I feel like changing the primary sprockets is so much more work than just changing the belt pulleys no?
 
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Old Apr 3, 2019 | 11:02 AM
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It may be for some but not for me. I did it the same time I changed out my clutch. I doesn't affect the speedometer either. I say what ever works best for you.

The OP wanted to know about dropping the RPMs at cruising speed. He now has all the options.
 
Last edited by apache snow; Apr 3, 2019 at 11:05 AM.
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Old Apr 3, 2019 | 11:37 AM
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Fascinating! I have a couple of questions here:

Assuming that the effective final drive ratio was the same, what would be the advantages/disadvantages of changing the front primary sprocket vs front drive pulley? Is there some secondary effective benefit of one approach over the other?

Also, with respect to drive pulley, what effective difference would be noticeable for switching the front final drive pulley from the stock steel to aluminum, if the same number of "teeth" were on both? I know the aluminum may be lighter and more prone to long term wear, but what side benefit would you experience from that lower rotational mass? How would that change how the bike feels? I haven't yet seen any real discussion of that.
 
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