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  #1 (permalink)  
Old 01-18-2018, 03:12 PM
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Jack shaft and BDL JS bushing support

Hey guy, so I'm taking this new bike apart and I'm running into a few little issues.
When I had it at the local shop for a second set of eyes and some small electrical work, I had them install a new starter (Spyke) So last week I see a little bit of aluminum shavings, I took off the BDL bushing support and found that the jackshaft teeth are cutting into the support. It also looks like the end of the shaft is cutting a little deeper into the support.

There is no wear at all on the jackshaft teeth or the ring gear.

Do you think the shop might of installed the wrong jackshaft, maybe something I'm missing?
FWIW, its a 2" open belt


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  #2 (permalink)  
Old 01-19-2018, 06:01 AM
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With jack shaft on and the cover off, see what is the clearance between the jack and ring gear- [ expected about .125-.150". IF LESS- THAT MAY EXPLAIN WHY IT OVERSHOOTS AND ALSO CAN CAUSE ENGAGING PROBLEM ]
ALSO check how far it shoots out when you trigger the solenoid[WITH COVER OFF]- ideally there should be solid overlap 100% of the jack and ring gear- SO THEY WEAR BETTER]
Maybe the jack is not sitting deep enough on the spyke's shaft or that shaft is a bit long- but it overshoots if it presses against the cover.
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Old 01-19-2018, 01:39 PM
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STEINBVG, I took a picture of the ring gear teeth and the jack shaft teeth. I don't have another JS to compare it to. If you look at the teeth on the JS you can see wear, it looks like the ring gear is causing that wear, or maybe they look like that. It looks close enough to me, that the ring gear teeth could be wearing on the jack shaft teeth with it disengaged and bike running.

Its hard to get my mic in there to measure it, it looks a lot less than .125

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Last edited by golfish; 01-19-2018 at 01:44 PM..
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Old 01-19-2018, 01:43 PM
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here's another shot that might help you
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Old 01-19-2018, 02:49 PM
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Quote:
Originally Posted by golfish View Post
here's another shot that might help you
The gap between the JS and ring gear easy to check by 1/8 Alen wrench.
May be combination of the new starter and the JS is a bit different than with the old starter- it protrudes too much?

As far as wear concerned, you don,t want to see partial overlap wear( teeth touch each other only by the edges. You want the full overlap.
Again, shoot the solenoid without the cover, see how the teeth engage.
If JS COMES OUT TOO FAR, you would have to somehow set it right on the shaft, see if there are any shims used, use thinner or none.
here,s a correct 1/8 clearance and good overlap.
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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
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Old 01-19-2018, 06:21 PM
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Quote:
Originally Posted by STEINBVG View Post
The gap between the JS and ring gear easy to check by 1/8 Alen wrench.
May be combination of the new starter and the JS is a bit different than with the old starter- it protrudes too much?

As far as wear concerned, you don,t want to see partial overlap wear( teeth touch each other only by the edges. You want the full overlap.
Again, shoot the solenoid without the cover, see how the teeth engage.
If JS COMES OUT TOO FAR, you would have to somehow set it right on the shaft, see if there are any shims used, use thinner or none..
Thanks for your help, much appreciated. The gap between the two is .075, there is a shim but its not worth noting. I can't pull the trigger because I have the back half of the bike torn apart. The oil tank needed work along with a few other minor things.
I'm going to talk to the shop that installed the starter, maybe see if they had a customer complain about a short jack shaft
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Old 01-23-2018, 08:22 AM
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I have had to recess the hole or space the outer cover out in the past. The Spyke and the BDL are the worst combination for a BDL drive and are the primary reason the jackshaft (belt drive fix) came about. These issues are common the fix comes with spacers that you can adjust the depth but you also need to decide if making the assembly shorter will promote or inhibit the best ring gear to pinion gear engagement.....
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Old 01-23-2018, 01:29 PM
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Quote:
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I have had to recess the hole or space the outer cover out in the past. The Spyke and the BDL are the worst combination for a BDL drive and are the primary reason the jackshaft (belt drive fix) came about. These issues are common the fix comes with spacers that you can adjust the depth but you also need to decide if making the assembly shorter will promote or inhibit the best ring gear to pinion gear engagement.....
John, I keep reading that "the fix" jackshaft is made for the 3" BDL open belt drive. I honestly don't see any reason these wouldn't work for the 2" BDL belt drive. The ring gear should be spaced out the same on both the 2" and 3" right?
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Old 01-23-2018, 02:02 PM
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Yes it will work on everything except the Top Fuel Drive and closed primaries. It also fits the 2 and 3” Ultima drives.

It was common to see Pitbull Choppers running around with a gap and washers in between the backplate and the bushing cover to stop them from bottoming out. The BDL stuff is to one side of the acceptable tolerance window and Spyke is at the other so they are a pain in the A@# to get happy without the belt drive fix.
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Old 03-06-2018, 03:13 PM
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Hey fellas, I need a little help with "The Fix" jackshaft. My camera is in my wifes car and I'm too stupid to figure out how to post pictures with my phone.

So looking at the directions for this item it shows part 6 locking plate on top of part 5 thrush washer. That locking plate part #6 has a tab that sticks out. That can't be right? it wont work in the BDL jackshaft support. Do we just use a reg washer here?

I'll try and get pictures if you need em
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Old 03-06-2018, 03:34 PM
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Do not use the lockplate just the standard washer
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Old 03-06-2018, 04:13 PM
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Thanks John, I was hoping you would chim in.

Can I use a lock washer too, or just the reg washer?
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