Scootworks 900 pulley is ready

[cbr74]

Transmission

[Easyrider32]

Originally Posted by woodchucks800

It's not that hard to do. The hardest part will be breaking the retaining nut loose in the first place.

20 minutes? I guess that means it can be changed without removing the rear wheel? Just loosen the belt first. Hmm I'll have to check my service manual on that. If its is true are they saying the dealer will do it for 30min labour charge? I think not! Probably 1 hour charge at least.

[woodchucks800]

Originally Posted by Easyrider32

20 minutes? I guess that means it can be changed without removing the rear wheel? Just loosen the belt first. Hmm I'll have to check my service manual on that. If its is true are they saying the dealer will do it for 30min labour charge? I think not! Probably 1 hour charge at least.

You'll just need to loosen the rear wheel and move it forward far enough to slpip your belt of the pully , swap the pully and slide the wheel back until you get the proper tension on the belt. One thing that'll make loosening the nut will be to leave the belt and wheel where it's at first (still under tension)and with the bike in gear along with appling the rear brake while someone is loosening the nut. Then loosen the back wheel and remove the belt. Now someone needs to find out what size the retaining nut is so one can find the right size socket first. The 800 has a 27mm which may be the size you need.

[Stoneball Jones]

Originally Posted by misterv

I don't know how it works. I just hope it drops rpm over 55-60. I want to hear my engine putt-putting at those speeds. I figure any loss of low end torque can be made up for with a new tornado air intake.

They call it an overdrive sprocket, so it should lower the rpm's a bit. I just ordered one. I'll post a report after I try it.

[cbr74]

If it's two teeth over stock, it'll drop primary ratio from 2.184 to 2.075. That's roughly a 5% change, ie: not much.

[jimbo-vn900]

cbr74, or anyone for that matter, any figures on what the actual decrease in RPMs would be? We are talking less than 200 RPMs difference, right? Is that worth it, or even noticeable at 70 mph? What would a 200 RPM decrease achieve?

[misterv]

A 200 rpm drop to me sounds like a waste of money. For it to be worth it to me, the drop would have to be around 1000. Would anyone agree with this?

[cbr74]

Originally Posted by jimbo-vn900

cbr74, or anyone for that matter, any figures on what the actual decrease in RPMs would be? We are talking less than 200 RPMs difference, right? Is that worth it, or even noticeable at 70 mph? What would a 200 RPM decrease achieve?

At 65mph it would be a difference of about 150 rpm.

Originally Posted by misterv

A 200 rpm drop to me sounds like a waste of money. For it to be worth it to me, the drop would have to be around 1000. Would anyone agree with this?

Not sure if that'd be feasible. There isn't much room to go larger on the drive pulley so assuming 2 over stock (40T) is max... in order to get the gear ratio to accomplish 1k drop in rpm's at 65mph would require a final drive ratio of less than 3:1 (vs 4.338:1 stock) and to get that with a 40T drive pulley you would need a 60T rear pulley (vs. 83T stock). Then you'd need a new belt, lose the lower belt guard, etc, etc.

On a sidenote... if it could pull that gearing all the way to 5800 rpm, you'd be travelling about 150mph.

[jimbo-vn900]

Hey cbr74, out of curiosity, how are you calculating it out to be 150 RPM difference?

I like math.

[cbr74]

I'm just using the difference in primary ratio as a percentage modification to the overall ratio then plugging it into a nifty speed calculator. I don't like math... I cheat.

[JFecht84]

I have been emailing Scootworks about it and they said at 65 the front pulley alone will drop it about 600 RPM and when the rear pulley comes out (End of May) it will drop it another 400 RPM.

I'm thinkin 190 w/shipping is well worth it for 600 RPM and when the rear comes out that will be awesome.

I know it sounds pretty optimistic but that is what I got in an email from them.

- New to the forums BTW... Hello all, just bought a Vulcan 900 Custom on Friday and am loving it.

[cbr74]

Not at 2 teeth over it won't. The only way to get that kind of reduction in RPM's from the front pulley would be to go 7 teeth over. So they either made a 45T front pulley... or they're full of it.

[Easyrider32]

Originally Posted by misterv

A 200 rpm drop to me sounds like a waste of money. For it to be worth it to me, the drop would have to be around 1000. Would anyone agree with this?

If you dropped 1000RPM at top end. Do you think you might loose significant acceleration and low end power?

[JFecht84]

I'm thinkin that you would cause you to feel like your outta the powerband. Considering your gonna be a 1000 RPM away from peak Torque.

I agree that the 600 RPM drop does sound like BS but that is straight from the email i got from them. I'm glad you guys are doing all the calculations to figure this out BTW cause my math tends to hurt anymore.

I'm waiting for another paycheck and then i'm gonna put the front one on and let you now how it seems. No tach so it'll be all by the seat of the pants but I figure thats what counts anyway.

[cbr74]

Originally Posted by Easyrider32

If you dropped 1000RPM at top end. Do you think you might loose significant acceleration and low end power?

Maybe.. but I've always felt she falls on her face way too quick in first, I don't think it'd hurt for her to be in the power band a little longer down low.
Also consider this... with a 45T front pulley... 0-60 would only require one shift instead of 2.

[Easyrider32]

HMMMMM Good point. Well I am sold on CBRs point, but I'll let someone else try it first. Or I'll be the first to try it if you guys just send it to my address.

[misterv]

Could we make up for a loss of low end torque with pipe and intake mods? I haven't taken the plunge for the intake yet, but from what I've heard, they really boost torque and acceleration. What do you guys think?

[cbr74]

I confirmed with Scootworks that the new pulley is 2 teeth over stock which means a drop of less than 200 rpm at 65 mph. To get a rough idea of the difference it will make... hit the freeway and wind it up to 65 mph... get a feel for that, then back it off to about 61 mph and that's approximately what 65 will fell like after the new pulley. (minus 4mph worth of wind resistance, etc) If the difference feels worth $180 then go for it.

[sdm74]

not worth it...and i belive you would lose some on the low end, which is the part i like

[Vulcan315]

Hey guys/gals,

The front pulley is finished, and the rear pulley is nearing completion. We don't have them on the site yet, we're working on load of website updates at the moment. The front pulley is +2 teeth (the largest that can be fitted to the engine), and the rear is 4 teeth undersize. Technical data and pics will be online soon.

We're getting the test bike in for final tests on the rear pulley this coming week. These pulleys take a lot of man & machine time, and a big slab of material. Currently, the rear is a similar design (in appearance) to the stocker, but we're working on some different ideas for the pattern. We kept the outer diameter (flange diameter) the same at the stocker, so it would look at home on the rear of the bike.

Using the front only, or both of these will work with the stock belt. I've got to check about using the rear only, to see if there is enough adjustability in the rear axle to work with the stock belt.

Cost of the front is $180. Cost of the rear is going to be around $325 painted. We're waiting on chrome quotes on samples at this time to see what that's gonna do...my gut feeling is chrome will push the price up to the $400 range. We've investigated having these made in asia to get the cost down, but it'll take some heavy volume to make that work.

I'm seldom on the forums during the summer due to workload here at the shop. You can email me at support@scootworks.com if you have any questions. Final specs should be upon the web by the end of next week (we're in the middle of a load of website changes on hundreds of pages).

Dave