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[42Cliffside]

What is the spline standard used on the 2017 R's
Clearances would be helpful for machining existing standard parts to clear..

[42Cliffside]

Still Curious.
Anyone?

[rayivers]

Honestly... you're better off just ordering a 30-08116 front pulley and taking measurements from it.  I've done this with so many Zero parts I've lost count. 

Ray

[42Cliffside]

I should not have to disassemble my bike to get a answer to this simple question.

What is the Spline standard that is used for the 2017 motor shaft.

[BrianTRice@gmail.com]

Some parts listings show "SHAFT KEY .25 MOTOR SPROCKET", but that's all I can find offhand.

Ray is suggesting spending $80 on a spare front sprocket for examination, not disassembly, but it is possible:
http://zeromanual.com/index.php/Unofficial_Service_Manual#Belt_Replacement

Honestly, if you expect to machine parts, why would this bother you? I'd never trust any manufacturer's specified numbers without verifying them, just because of tolerances or transcription errors.

[Killroy]

Some parts listings show "SHAFT KEY .25 MOTOR SPROCKET", but that's all I can find offhand.

2017 is splined, while older models have keyed shafts. 

I would suggest to the OP to try contacting Zero Customer Service.  I like those guys. 

[BrianTRice@gmail.com]

Some parts listings show "SHAFT KEY .25 MOTOR SPROCKET", but that's all I can find offhand.

2017 is splined, while older models have keyed shafts. 

I would suggest to the OP to try contacting Zero Customer Service.  I like those guys. 

Oh, I got my wires crossed while searching. Customer Service seems like a good approach.

[skoleskibe]

How come they changed from a key'd to a spline'd front sprocket?
Any history of bikes shearing the key?

Wondering as my my15 SR is slowly developing a transmission "slack". Most significant when applying power after having used regen. The belt is tight, so either it's the front or the rear sprocket.



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[Electric Terry]

How come they changed from a key'd to a spline'd front sprocket?
Any history of bikes shearing the key?

Wondering as my my15 SR is slowly developing a transmission "slack". Most significant when applying power after having used regen. The belt is tight, so either it's the front or the rear sprocket.

Correct, with extreme use going from 100% throttle to 100% regen many thousands of times and the single key can start to develop slack and eventually shear or damage the motor shaft itself.  This is the biggest advantage right now upgrading to a 2017 Zero is the stronger motor, belt and of course more power also.

But skoleskibe if you don't upgrade soon (with the end of year deals on the 2017 now would be a good time) at least have the dealer replace your keyway and follow procedure for properly replacing it.  Requires a torch to melt the permanent locktite and a lot of care not to damage the motor bearings.  It's a total PIA job just ask Nigel Morris in Australia who recently did this.  It sounds like you ride hard and might benefit long term just getting the stronger design of the 2017 now since it's available and much better in so many ways.  The battery alone in 2017 with the lighter weight long brick design for the same energy is amazing!  Plus if you have a 2015, you don't have the more efficient IPM design yet, that will run much cooler and be extremely hard to ever overheat.  If enough of these are important, I'd trade it in and let the dealer replace the sprocket on their own time and just start riding a new 2017 bike now.


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[Electric Terry]

What is the spline standard used on the 2017 R's
Clearances would be helpful for machining existing standard parts to clear..

I agree just order a 2017 sprocket from Zero customer service.  I recall hearing that it's not common.  This way you can't go wrong

[KrazyEd]

I was at Hollywood Electrics recently and Harlan mentioned that the spline was the same as another bike so that chain conversion would be easy.
Unfortunately, I do not have a 2017, so, I did not retain the model number. He did mention that the sprocket could be machined so that the wider
belt could be made to work on earlier models. Possibly contact him to see if he has already started putting chain and sprocket kits together.

[Harlan]

What is the spline standard used on the 2017 R's
Clearances would be helpful for machining existing standard parts to clear..

I have not confirmed this myself, but the spline is supposed to match a KX250F as well as a YZ450F.

[Keith]

I have not confirmed this myself, but the spline is supposed to match a KX250F as well as a YZ450F.

Nice to know, if confirmed, but these are not available with less than 12 teeth so still custom for those of us who prefer torque to speed.

[MrDude_1]

I have not confirmed this myself, but the spline is supposed to match a KX250F as well as a YZ450F.

Nice to know, if confirmed, but these are not available with less than 12 teeth so still custom for those of us who prefer torque to speed.

these guys can do it for an almost off-the-shelf price... http://sprocketspecialists.com/
its what they do.