Jackshaft components

xdomhnallx · 09-02-2008, 10:41 PM

OK, so I got my new jackshaft today and I am not sure the right way to install the components. I have the shaft, 2 bearings, 2 gears, 2 hangers, but only 1 lock collar? I have done several mock-ups but it always comes back to needing another lock collar. Do I set it up in a way that uses one of the gears as a lock collar or am I missing something here? If I set it up using my gears as collars then I don't even need the 1 collar that I do have. Or do I? I feel like there is something really simple that I am missing but it looks like it should work. Any advise from the crew?

The full setup...

Up close, sprocket, Bearing with snapring OUT, and then the Hanger.

xdomhnallx · 09-02-2008, 10:44 PM

By the way, it's probably a little ironic that my jackshaft is sitting on my jackass video game. Just realized that...haha! What a jackass!

**GTO** · 09-02-2008, 11:55 PM

You'll need to line up your sprockets and make sure everything is locked in right and left so the bearings and shaft doesn't slip off. You may need spacer washers too so nothing rubs the upper side of the bearing. If the big sprocket goes to the wheel sprocket, you have a higher gear.

Do you have a welder?

**Yellowhand** · 09-03-2008, 12:14 AM

I prefer to set up jackshafts in the same way we set up wheels...with spacers instead of locking collars...and a coat of grease on the shaft is protected by the sleeve/spacer and the jackshaft assembly comes apart easily for future gearing changes, versus a rusty mess that has to be wrestled apart.

xdomhnallx · 09-03-2008, 12:50 AM

Yeah I have a 110 mig from harbor freight and an old 220 stick welder that I have been playing with for about a year now. I'm actually better with the stick welder. I have seen where some kits come with 2 collars, but alot only have one. I wasn't sure if I was missing the boat on the set-up or what. I do like the Idea of just useing spacers. I havn't even pulled my bike out yet to see how things will line up yet. There are some metal uprights, for lack of a better word, already on my bike. So I might be able to incorporate that as well. From the looks of it...if I used the gears as collars, they are totally going to rub the upper side of the bearings so I will scratch that idea. Yellowhand, that looks pretty slick. My shaft is not tapped on the ends though. I think I would still need a collar there wouldn't I? Or use the gear with a washer behind it that is smaller than the outer race of the bearing?

**GTO** · 09-03-2008, 02:28 AM

Quote:

Originally Posted by xdomhnallx

Yeah I have a 110 mig from harbor freight and an old 220 stick welder that I have been playing with for about a year now. I'm actually better with the stick welder. I have seen where some kits come with 2 collars, but alot only have one. I wasn't sure if I was missing the boat on the set-up or what. I do like the Idea of just useing spacers. I havn't even pulled my bike out yet to see how things will line up yet. There are some metal uprights, for lack of a better word, already on my bike. So I might be able to incorporate that as well. From the looks of it...if I used the gears as collars, they are totally going to rub the upper side of the bearings so I will scratch that idea. Yellowhand, that looks pretty slick. My shaft is not tapped on the ends though. I think I would still need a collar there wouldn't I? Or use the gear with a washer behind it that is smaller than the outer race of the bearing?

The intention on the kit is the sprockets are used as stops but you do need to use spacers or fender/machine washers and or small tubing/pipe depending on your spacing. It's pretty easy.

I buy different sprockets to get the gearing right as well.

What bike do you have? if there is brackets in that area it would be much easier to line stuff up and have it squared.

Another problem you could run into is shaft length. Heres one I did that needed to be on the outside for a bigger engine.

**Yellowhand** · 09-04-2008, 11:39 PM

Quote:

Originally Posted by xdomhnallx

Yeah I have a 110 mig from harbor freight and an old 220 stick welder that I have been playing with for about a year now. I'm actually better with the stick welder. I have seen where some kits come with 2 collars, but alot only have one. I wasn't sure if I was missing the boat on the set-up or what. I do like the Idea of just useing spacers. I havn't even pulled my bike out yet to see how things will line up yet. There are some metal uprights, for lack of a better word, already on my bike. So I might be able to incorporate that as well. From the looks of it...if I used the gears as collars, they are totally going to rub the upper side of the bearings so I will scratch that idea. Yellowhand, that looks pretty slick. My shaft is not tapped on the ends though. I think I would still need a collar there wouldn't I? Or use the gear with a washer behind it that is smaller than the outer race of the bearing?

Yeah, use a washer or spacer to keep the gear off the bearing...

I started drilling and tapping the ends of my jackshafts as a way to keep my sprockets on...I use loc-tite on all the set screws and they still come loose and get flung off...

xdomhnallx · 09-05-2008, 12:27 AM

At my local shop their shafts have a drilled and tapped end to them. I opted not to go with them because they were talking $50. And I got mine online delivered for around $30. Also the guy can be an ass sometimes when you go in there. But anyway, you guy's have given me some good food for thought. Hey Yellowhand... what are you using for spacers? It looks like that psuedo metal sleeve that comes on a weight lifting bar or a bath curtain rod. But it cant be that stuff, that doesn't seem like it would be strong enough. I bought the 5/8" jackshaft. I guess as long as the ID is a little bigger then I should be OK with just some steel or aluminum pipe right?

**Yellowhand** · 09-06-2008, 12:06 AM

Quote:

Originally Posted by xdomhnallx

At my local shop their shafts have a drilled and tapped end to them. I opted not to go with them because they were talking $50. And I got mine online delivered for around $30. Also the guy can be an ass sometimes when you go in there. But anyway, you guy's have given me some good food for thought. Hey Yellowhand... what are you using for spacers? It looks like that psuedo metal sleeve that comes on a weight lifting bar or a bath curtain rod. But it cant be that stuff, that doesn't seem like it would be strong enough. I bought the 5/8" jackshaft. I guess as long as the ID is a little bigger then I should be OK with just some steel or aluminum pipe right?

Looks the same, but the tubing I have is much thicker...I thought the ribbed stuff would look like a toothed belt drive...I have some smooth wall also.

xdomhnallx · 09-07-2008, 12:35 AM

Well I got my Jackshaft installed today. I think I need some new chain. Or maybe my sprockets aren't lined up right. When I get it going to a pretty decent speed (30-35) my chain starts rattling like it wants to jump off on the back sprocket. When I have it up on the stand and spin the back wheel it looks like the chain moves in and out (towards and away from the bike), kinda like the chain has a bend in it. Rear sprocket may have a little bend in it that could be straightened as well. I could definately feel that the top end was going to be faster. I have a 12 tooth clutch running to a 13 tooth on the shaft with an 18 tooth on the other end. I have a 72 tooth sprocket on the rear wheel. I'm 6' 1" 220# and it ran 32 mph before the jackshaft install. Not sure where it will top-out now. Just have to get things tweek'd I guess.