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Author Topic: Jack Shaft sprocket source  (Read 223 times)

brokinspokes78

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Jack Shaft sprocket source
« on: July 28, 2017, 05:28:30 AM »

Hello,
 Does anyone have a reliable source for jack shaft sprockets that fit the Agni motors? The shaft on the Agni is 19mm, and the chain size is 420. I found and ordered three different sprockets made by TRITAN off of Ebay. They have the correct shaft size of 19mm, but neither the 1/2", 3/8" or 5/8" pitch will not match up to the 420 chain used by zero motorcycles. I was able to locate the sprocket for the 420 chain, but the shaft size is 3/4 instead of 19mm.  It's Close, but requires to be shimmed, and I just don't think thats the proper way to do it. I need a 19mm jack shaft sprocket, with a 6mm key way. 12-14 tooth and must fit a 420 chain. Thank you in advance
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Brokinspokes78: 2011 Zero Xu Agni95R Alltrax4865

Erasmo

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Re: Jack Shaft sprocket source
« Reply #1 on: July 29, 2017, 02:14:28 PM »

A local welder might adapt it for you so you don't need shims?
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brokinspokes78

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Re: Jack Shaft sprocket source
« Reply #2 on: July 29, 2017, 10:35:17 PM »

Very True, I also am looking a sleeve adapter that might work. Thanks
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Brokinspokes78: 2011 Zero Xu Agni95R Alltrax4865

rayivers

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Re: Jack Shaft sprocket source
« Reply #3 on: July 30, 2017, 11:19:13 PM »

420 chain specs: .500" pitch / .3125" roller diameter / .250" roller width / .227" sprocket width.  #41 sprocket teeth will engage 420 chain links, but they're made for .306" dia. rollers and a #41 sprocket / 420 chain combo will wear quickly.  Some sprocket places sell '41/420' sprockets, but there's no such thing.

Also, 19mm is .7486"; if anything, a true 19mm-shaft sprocket might need grinding (not shimming) to fit a .750" shaft, though with normal production tolerances it really shouldn't need either one.

If you want to do it right (as opposed to using a #41 sprocket), you may have to do what I did; machine a wider sprocket (in your case, #40 / .284" width) to .227" wide.

I really hope Zero went with a motorcycle spline standard in 2017.  Finding 420/520 MC-chain sprockets using electric-motor finished bores has been nearly impossible, for me at least.

Ray
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'14 Zero FX 5.7 (now 2.8, MX), '14 Zero FX 2.8 (street), '08 YZ250F, '82 RM250Z, '75 MR175, '74 CR125M (175cc)

BrianTRice

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Re: Jack Shaft sprocket source
« Reply #4 on: July 31, 2017, 01:09:02 AM »

The 2017 accessories lookup shows a new 520 DID X-ring chain option for S/DS bikes, if that helps.
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Zero: 2016 DSR, 2013 DS
Also: 2012 Suzuki DL-650 V-Strom Adv

rayivers

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Re: Jack Shaft sprocket source
« Reply #5 on: July 31, 2017, 01:33:28 AM »

Thanks Brian!  The 2017 FX parts list I have shows a 65T 520 rear sprocket 30-05090, but no front chain sprocket - and the '17 FXS fiche shows no chain sprockets at all.  :~]  My dealer's parts girl has been really helpful getting obscure parts info out of Zero, so if I can get the p/n I think I'll bite the bullet and get a '17 chain kit splined front sprocket to measure, just to have the info.  Do all the '17 motors have splined shafts?

Ray
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'14 Zero FX 5.7 (now 2.8, MX), '14 Zero FX 2.8 (street), '08 YZ250F, '82 RM250Z, '75 MR175, '74 CR125M (175cc)

BrianTRice

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Re: Jack Shaft sprocket source
« Reply #6 on: August 14, 2017, 10:17:56 AM »



I added the tiny core of this thread's info to the wiki:
http://zeromanual.com/index.php/Unofficial_Service_Manual#Agni_Motor

Thanks Brian!  The 2017 FX parts list I have shows a 65T 520 rear sprocket 30-05090, but no front chain sprocket - and the '17 FXS fiche shows no chain sprockets at all.  :~]  My dealer's parts girl has been really helpful getting obscure parts info out of Zero, so if I can get the p/n I think I'll bite the bullet and get a '17 chain kit splined front sprocket to measure, just to have the info.  Do all the '17 motors have splined shafts?

All the models with the new belt should have splined shafts, I should think.

I inferred a bunch of info about the keyed shaft for the Z-force motor here, and left open a section for the spline when we figure out what it is:
http://zeromanual.com/index.php/Unofficial_Service_Manual#Motor_Shaft
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Zero: 2016 DSR, 2013 DS
Also: 2012 Suzuki DL-650 V-Strom Adv
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