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  #1 (permalink)  
Old 11-15-2017, 07:34 PM
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Ultima Jackshaft Problem

I have the ultima open primary and sometimes the jackshaft seems to get stuck and not pop out. Iíve read about alignment issues and the shaft not retracting but havenít heard of anyone having my problem.

It sounds like a dead battery when I push the button. Soft clunk sound. The shaft sounds to be in a bind or bottoming out after maybe 1/8 inch movement. If I loosen the shaft cover just ever so slightly and push the button again it comes out and fires. Itís always hit and miss. Sometimes it will work flawlessly a couple times a day, then itís will pop out and Ďzingí and grind and may or may not catch.

Any suggestions?
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Old 11-16-2017, 05:19 AM
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Quote:
Originally Posted by DeafBillyGoat View Post
I have the ultima open primary and sometimes the jackshaft seems to get stuck and not pop out. Iíve read about alignment issues and the shaft not retracting but havenít heard of anyone having my problem.

It sounds like a dead battery when I push the button. Soft clunk sound. The shaft sounds to be in a bind or bottoming out after maybe 1/8 inch movement. If I loosen the shaft cover just ever so slightly and push the button again it comes out and fires. Itís always hit and miss. Sometimes it will work flawlessly a couple times a day, then itís will pop out and Ďzingí and grind and may or may not catch.

Any suggestions?
Granted your battery and starter are fine
1) make sure the gap between the ring gear and the jack-shaft gear is 1/8''- use more or less shims to achieve that. Too close- click, no engagement. too far- heavy banging and also possible lack of engagement.

look at the distance here. Never mind the jack shaft housing setup. actually i made it using ultima dimensions as a template. Worked out great.


2) when you tighten the cover, push it up with your finger as far as the sloppy holes allow and then tighten it in that position[ it may improve vertical clearance].
3) put some wheel lube on the jack shaft gear and inside the bushing

I had experience with 3 ultima primaries and never had to go for the 'fix' jack shaft, although i can see how it's sloppy design makes alignment easier
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Old 11-16-2017, 10:47 AM
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Quote:
Originally Posted by STEINBVG View Post
Granted your battery and starter are fine
1) make sure the gap between the ring gear and the jack-shaft gear is 1/8''- use more or less shims to achieve that. Too close- click, no engagement. too far- heavy banging and also possible lack of engagement.
My spacing is at 1/4 inch.

So my dumb question for the day is, where does a shim go? Before or after #11, or another spot?

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Old 11-16-2017, 11:10 AM
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Quote:
Originally Posted by DeafBillyGoat View Post
My spacing is at 1/4 inch.

So my dumb question for the day is, where does a shim go? Before or after #11, or another spot?

CHECK OUT ULTIMA PDF INSTALLATION FILE, # 6, WHERE THEY RECOMMEND .150" CLEARANCE[ I THINK OK .125-.150].
http://www.ultimaproducts.com/BeltDrive.pdf
ALSO THE GEAR SHOULD BE ABLE TO FREELY MOVE .125 " IN AGAINST THE SPRING- THAT ALLOWS FOR THE GEAR TO ENGAGE THE RING GEAR EASIER.

AS FAR AS SPACING- YOU MAY NEED ABOUT 1/8" WASHER PLACED BEHIND THAT SPLINTED SPACER. THE SHOCK SPRING GOES IN FRONT OF IT.
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VITALY.
SORRY FOR THE UPPER CASE. I AIN'T YELLING. I JUST MAKE TOO MANY TYPOS IN THE LOWER.

113"s&s, Walz softail 2000/2012 prostreet
96"s&s, Daytec dyna/ softail hybrid, 1998/2010 chopper
127"Ultima, Chassis Design rigid 2013 bobber
120"Ultima, Kraft Tech rigid 2014 bobber
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Old 11-16-2017, 11:31 AM
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Quote:
Originally Posted by STEINBVG View Post

AS FAR AS SPACING- YOU MAY NEED ABOUT 1/8" WASHER PLACED BEHIND THAT SPLINTED SPACER. THE SHOCK SPRING GOES IN FRONT OF IT.
Thanks for the help, Iíll post the results after I work on it.
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Old 11-28-2017, 10:06 AM
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The Belt Drive fix will fix this if you cannot get it to go away by readjusting it.

John
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Old 11-29-2017, 04:07 PM
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I had the same problem. Got the belt drive fix from Scooters Performance, fixed the problem.
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Old 12-01-2017, 02:30 PM
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https://scootersperformance.com/scoo...ives-p-24.html

Pretty much what the fix was designed for. You can sometimes keep adjusting and find a happy spot for the standard jackshaft but the fix pretty solves any issues. I have sold a ton of them and always use them on any in house projects that have a BDL or Ultima belt drive.....
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