six gears on zephyr ,read on
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David Richard
- Posts: 274
- Joined: 04 Sep 2017, 20:21
six gears on zephyr ,read on
this makes interesting reading if you have the time ,a chap on the kzr forum has spent time to see if another gear can be put in a 750 and other models its way above my scope i think freddy might be able to work it out ,you can visit the sight as a guest ,david
Re: six gears on zephyr ,read on
Here's the link ......
https://kzrider.com/forum/2-engine/6074 ... ons#813984
My main thought ..... the reason stated for undertaking quite a large task. While I know its popular to want reduce the engine revs at highway speeds (its even a popular modification to the new Z900RS) I don't personally think its a issue. It's an inline 4. Inline 4's are designed and meant to rev. So personally, if I thought the ZR750 would significantly benefit from having a 6th gear, it wouldn't be to reduce top gear revs. I'm quite happy with stock gearing on the highway, I actually wouldn't want to be forced to always have to change down to overtake. Just twist the throttle and go in most situations.
If I thought a ZR750 would benefit from a 6 speed gearbox, it would only be to have one more usable gear between 2nd and 5th. I think in practice the ZR750 really only has a 3 speed gear box once underway (5,4,3). It'd be nice to have a forth gear in this range with better spacing between 2-3.
Do I think its a big enough issue to go to all this effort, nope. It'd be more a case of doing it, just because you can, to be unique, just for the fun of it .... rather than a significant necessary improvement.
P.S. Re-jetting the carbies for a cost of about $20 to give way more grunt in any gear is how I overcame most of the limitations of 'just' a 5 speed box. I found the significant extra grunt on a D1 model going up one size genuine main jets on the middle carbies, and two on the outer ones was way more effective than what I anticipate an extra gear would give. No noticeable effect of fuel consumption/range. And for what its worth, I wouldn't touch non genuine Keihin jets, you have no idea what your getting, either size or quality wise.
https://kzrider.com/forum/2-engine/6074 ... ons#813984
My main thought ..... the reason stated for undertaking quite a large task. While I know its popular to want reduce the engine revs at highway speeds (its even a popular modification to the new Z900RS) I don't personally think its a issue. It's an inline 4. Inline 4's are designed and meant to rev. So personally, if I thought the ZR750 would significantly benefit from having a 6th gear, it wouldn't be to reduce top gear revs. I'm quite happy with stock gearing on the highway, I actually wouldn't want to be forced to always have to change down to overtake. Just twist the throttle and go in most situations.
If I thought a ZR750 would benefit from a 6 speed gearbox, it would only be to have one more usable gear between 2nd and 5th. I think in practice the ZR750 really only has a 3 speed gear box once underway (5,4,3). It'd be nice to have a forth gear in this range with better spacing between 2-3.
Do I think its a big enough issue to go to all this effort, nope. It'd be more a case of doing it, just because you can, to be unique, just for the fun of it .... rather than a significant necessary improvement.
P.S. Re-jetting the carbies for a cost of about $20 to give way more grunt in any gear is how I overcame most of the limitations of 'just' a 5 speed box. I found the significant extra grunt on a D1 model going up one size genuine main jets on the middle carbies, and two on the outer ones was way more effective than what I anticipate an extra gear would give. No noticeable effect of fuel consumption/range. And for what its worth, I wouldn't touch non genuine Keihin jets, you have no idea what your getting, either size or quality wise.
Re: six gears on zephyr ,read on
Daftrusty, the originator of the conversion in the KZ forum who started that link in '17, is also a member of this forum.....