SuzukiSavage.com - Rear Pulley Wobble Fix

RocketScienceSmurf Senior Member Offline SuzukiSavage.com Rocks! Posts: 268 Sweden Gender:	Re: Rear Pulley Wobble Fix Reply #75 - 09/20/20 at 00:40:48 And here is the suggested modification with a needle roller on the opposite side of the original ball bearing
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tinnyfacexd YaBB Newbies Offline Loud Pipes Save Lives Posts: 12 New Zealand Gender:	Re: Rear Pulley Wobble Fix Reply #76 - 10/20/20 at 03:13:11 Just ordered the bearing, the wobble on my pulley was insane today. way worse than I've ever seen it before. Will take a spare spacer down to the machinist later this week. How far in does the shoulder need to be turned? Also thanks DragBikeMike for this simple yet (hopefully) effective mod!
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Armen Serious Thumper Offline Half-Witted Wrench-Jockey from Jersey Posts: 1454	Re: Rear Pulley Wobble Fix Reply #77 - 10/20/20 at 06:21:33 Hey Tinny Look on the first page of this thread for DBM's drawing with dimensions.
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Armen Serious Thumper Offline Half-Witted Wrench-Jockey from Jersey Posts: 1454	Re: Rear Pulley Wobble Fix Reply #78 - 10/20/20 at 06:23:24 Kamel, How is it you are side loading the needle bearing? I don't see how the rotational load of the outer bearing is being transferred thru the needle bearing.
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RocketScienceSmurf

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Re: Rear Pulley Wobble Fix
Reply #79 - 10/20/20 at 07:00:46

Armen wrote on 10/20/20 at 06:23:24:

Kamel,
How is it you are side loading the needle bearing? I don't see how the rotational load of the outer bearing is being transferred thru the needle bearing.

Not sure I fully understand your question. Inside the original bearing there is a bushing and my idea was to have a bearing on each end of that bushing to better deal with the forces since the belt pulley as far as I can see is not centered on the factory installed bearing.

I have not made the modification on my own pulley yet since I need to get a boring head and some suitable boring bars before I can modify mine.

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ohiomoto Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 2825	Re: Rear Pulley Wobble Fix Reply #80 - 10/20/20 at 16:04:40 I'm guessing I have put 5-6k miles on my bike since doing this mod and the pulley is still solid as a rock.
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DragBikeMike

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Re: Rear Pulley Wobble Fix
Reply #81 - 10/20/20 at 16:28:41

Kamelryttarn, I'm sorry to say that your modification will not work. When you tighten the axle the inner race of the ball bearing MUST be pinched in order to set the axial position of the drive hub and to lock the inner race to the axle. Both conditions are mandatory.

The duplex ball bearing modification is cheap and simple. It works perfectly and lasts a long time. I advise you to just install the duplex ball bearing.

This markup of your sketch might help.

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Kamelryttarns_Bearing_Markup.jpg

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badwolf

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Re: Rear Pulley Wobble Fix
Reply #82 - 10/20/20 at 19:46:51

DBM, I think his idea might work, IF, he made a fancy spacer to go between the 2 bearings. The squeeze load would have to be carryed by the inner races without touching the outer races. I don't know if the needle bearing's inner race would take it thou.
I did the duplex conversion on my 2 bikes and it works great. Simple and effective.
I have a old Atlas lathe at home for tinkering but his idea would still be a lot of work.

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BobH Junior Member Offline 2008 Stock S40; 2015 Stock S40 Posts: 56 New Hampshire Gender:	Re: Rear Pulley Wobble Fix Reply #83 - 10/20/20 at 19:52:09 Just so I'm clear. Replacing #15 with a double bearing. Discarding #16. Machining #19. Armen are you still machining the spacer for folks? If so, do you require a spacer to be sent to you?
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badwolf Serious Thumper Offline Ridin' my Lil' Bagger - 153k miles so far Posts: 807 Palm Beach County, FL Gender:	Re: Rear Pulley Wobble Fix Reply #84 - 10/20/20 at 20:07:02 You have got it right. Measure the 2 bearings width to get the differnce, that is how much has to be cut as a shoulder on #19.
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BobH Junior Member Offline 2008 Stock S40; 2015 Stock S40 Posts: 56 New Hampshire Gender:	Re: Rear Pulley Wobble Fix Reply #85 - 10/20/20 at 20:17:37 Thanks! I have DBM's drawing also.
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Armen

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Re: Rear Pulley Wobble Fix
Reply #86 - 10/20/20 at 20:25:46

Hi Bob,
I've just moved so who knows where the spacers I had are :-0
If you send one, it makes things much easier.
thanks
BTW, Yamaha uses a needle bearing on the rear wheel of the R6. Can't remember how they do the spacers so the load is transferred properly.
for the Savage, it seems like a lot of work to find a solution that is at best, as good as the one DBM came up with. As I often said to my students, "Sure, you could probably come up with a way to do root canal through someone's butthole, but wouldn't it be easier to just ask them to open their mouth?"

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BobH

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Re: Rear Pulley Wobble Fix
Reply #87 - 10/20/20 at 20:45:30

Armen wrote on 10/20/20 at 20:25:46:

Hi Bob,
I've just moved so who knows where the spacers I had are :-0
If you send one, it makes things much easier.
thanks

I have two S40's so will send you two spacers. I will PM.

Also, in looking for 5205-2RS bearings, I note W5205-2RS bearings. I can't determine what the W means. Anyone know if there is any difference?

Thanks!

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Bob

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Armen Serious Thumper Offline Half-Witted Wrench-Jockey from Jersey Posts: 1454	Re: Rear Pulley Wobble Fix Reply #88 - 10/20/20 at 20:57:02 Awesome Bob! thanks!
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RocketScienceSmurf Senior Member Offline SuzukiSavage.com Rocks! Posts: 268 Sweden Gender:	Re: Rear Pulley Wobble Fix Reply #89 - 10/20/20 at 22:02:07 If my calculations and measurements are correct I can use the original spacer as intended and it will pinch in the way you describe DBM. It will float freely sideways and protrude out past the needle roller to meet up with the wheel hub surface it is supposed to.
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