Yamaha Starbike Forum banner

1 - 20 of 22 Posts

·
Registered
Joined
·
16 Posts
Discussion Starter #1
So I did something to my wife's 950.... Recently on my RoadStar Warrior I changed front pulleys I went from a 32 to a 33 tooth. It dropped my highway rpms by a little over 500 rpms almost like having a 6th gear now. So I did a bunch of research on changing hers on her 950. I found that my stock RoadStar Warrior pulley would fit with a little modification. So I figured let's give it a try.
So I took the stock 30 tooth pulley off of her bike and put on the stock 32 tooth pulley off of my Warrior. I had to make shims for the front and back of the pulley so off to the hardware store I went. I found some bushings that did the trick. I wish I could remember what size I bought now but of course I didn't write it down. I had to modify the speed sensor bracket to get it to fit. By my assumption doing this should drop her highway rpms about 700 to 800 rpms I really have no way of telling as she does not have a tachometer on her bike. As soon as the snow melts and I can get out of the driveway I will take it for a ride before I let her ride to make sure everything is ok and it runs like it should. She may suffer a little on take off but shouldn't be to much since she has the aftermarket parts to increase power anyways. (Fuel management system, Barons big air kit and a slip on) I will post another update as soon as I take it for a ride. This is still running the stock belt and stock rear pulley.

Of course I took some pictures of what I did though.


Sent from my SM-G960U using Tapatalk
 

·
Registered
Joined
·
51 Posts
Good stuff here! Before I went 65T on the rear of my 950 I toyed around with the Warrior pulley, I just didn't have one lying around.

You basically just changed your RPM's by 10%. The old gearing, divided by the new gearing: 70/30 divided by 70/32, is 1.097. So now everywhere you used to be at speed will now be 10% lower in RPM.

Your speedo is gonna be wayyyy off now too, fyi.
 

·
Registered
Joined
·
16 Posts
Discussion Starter #4
Good stuff here! Before I went 65T on the rear of my 950 I toyed around with the Warrior pulley, I just didn't have one lying around.

You basically just changed your RPM's by 10%. The old gearing, divided by the new gearing: 70/30 divided by 70/32, is 1.097. So now everywhere you used to be at speed will now be 10% lower in RPM.

Your speedo is gonna be wayyyy off now too, fyi.
I had a feeling the speedo would be off I'm just not sure yet as how much. I haven't had a chance to ride it yet. I live in Michigan and we just got about 8 inches of snow so it may be a while before I can try everything out. Her speedo was 5mph off before speedo would say 70 and she was doing 65. I hope soon to be able to see if this works. Fingers crossed....

Sent from my SM-G960U using Tapatalk
 

·
Registered
Joined
·
51 Posts
I had a feeling the speedo would be off I'm just not sure yet as how much. I haven't had a chance to ride it yet. I live in Michigan and we just got about 8 inches of snow so it may be a while before I can try everything out. Her speedo was 5mph off before speedo would say 70 and she was doing 65. I hope soon to be able to see if this works. Fingers crossed....

Sent from my SM-G960U using Tapatalk
Condolences... I grew up and spent 35 years in WI.

I'd encourage you to download a free GPS app on your phone, then check it quick on some sleepy road (when the snow melts, of course).

My 950, with a friggin car tire on it from the previous owner, was 3ish MPH off with the 70/30. The 70/31 put it at a solid 5mph off. Then when I went 65T in the back the correction went the other way and now it's dead nuts.

Also, do you have a better pic of what you did to the speedo sensor mount? Maybe a pic from the same angle, before and after? It's hard to tell what changed between the two pics.

Thanks.
 

·
Administrator
Joined
·
13,697 Posts
My 950, with a friggin car tire on it from the previous owner, was 3ish MPH off with the 70/30. The 70/31 put it at a solid 5mph off. Then when I went 65T in the back the correction went the other way and now it's dead nuts.
you're saying the 31T pulley made your speedo less accurate? others have reported the opposite:

"Speedometer difference dropped from 5-7mph to 2-3mph."

https://www.starbikeforums.com/forums/49-v-star/91465-950-overdrive-pulley-mod.html
 

·
Registered
Joined
·
16 Posts
Discussion Starter #7
Condolences... I grew up and spent 35 years in WI.

I'd encourage you to download a free GPS app on your phone, then check it quick on some sleepy road (when the snow melts, of course).

My 950, with a friggin car tire on it from the previous owner, was 3ish MPH off with the 70/30. The 70/31 put it at a solid 5mph off. Then when I went 65T in the back the correction went the other way and now it's dead nuts.

Also, do you have a better pic of what you did to the speedo sensor mount? Maybe a pic from the same angle, before and after? It's hard to tell what changed between the two pics.

Thanks.
Well if you look at the pictures you can see where I started to cut it. I basically cut the bevell off the end if it. Then I put a spacer in between the sensor and the mount to bring it back flush with the sensor bracket.

Sent from my SM-G960U using Tapatalk
 

·
Registered
Joined
·
51 Posts
you're saying the 31T pulley made your speedo less accurate? others have reported the opposite:

"Speedometer difference dropped from 5-7mph to 2-3mph."

https://www.starbikeforums.com/forums/49-v-star/91465-950-overdrive-pulley-mod.html
Yes! My only retort to those claims was were they proven by taping their phones with the GPS app running right next to the speedo and hitting the interstate? I'm 100% positive my speedo was 5 mph off at 80 with the 31T. Unless, of course, my GPS was not "calibrated" and all the Tampa interstate flowing traffic was screwing with me about average pace. That's what tipped me off about my speedo in the first place. The damn thing said 70, but I'm getting my doors blown off!!! Then my dad (14 Street Glide) asked me why the hell I was going "around 65"?

And to be 100% transparent, I never actually did the same GPS thing with my 70-30 combo so it very well may have been 6-7 mph off with that gearing at those speeds. I'd like to encourage someone with an app to do this, just to see. Having somebody riding next to you isn't the same either, use the app. It's a free download.

It's all because of damn cheap Engineers taking the speedo sensor off the front wheel... :rolleyes::mad: Shoulda just left well enough alone, damn nerds.
 

·
Administrator
Joined
·
13,697 Posts

·
Registered
2008 Vstar1300
Joined
·
345 Posts
So overall how is it ?? slower out of the hole but rpms better when cruising ?? Might also consider IVAN's ecu tune for her 950.. alot of riders love the results.. It'snot just about power but riding improvement and engine behaviour.. Love that i did it to my 1300..
 

·
Registered
Joined
·
16 Posts
Discussion Starter #12
Not to much difference out of the hole. Overall I would say about 300 to 500 less rpms at highway speeds. Doesn't feel as "buzzy" at 80 mph. The speedo is 5mph off now. I assume the fuel economy will increase as well but not sure in this.



Sent from my SM-G975U using Tapatalk
 

·
Registered
Joined
·
446 Posts
Yes, my stock setup was 8% high. I get a speedo corrector and adjusted it using that. I knew mentially I can compute the adjustment in my head, but that takes time, just want to know what I'm really doing.
GPS shouldn't be an issue in tampa, what screws with gps speed is elevation changes, and you want as many satellites on the horizon as possible (not above you).
 

·
Administrator
Joined
·
13,697 Posts
Not to much difference out of the hole. Overall I would say about 300 to 500 less rpms at highway speeds.
this is pretty much what people have quoted that went from the 30 to a 31 tooth pulley. i have to imagine your wife's bike is seeing bigger dividends than them, but i don't think anyone's actually had a tachometer to know what the actual difference is.
 

·
Registered
Joined
·
446 Posts
Well, it's simple math to figure out what speed you are going, assuming stock tires. As for what the difference was based on the same tire, wouldn't know the exact rpm via math, but would know the rpm difference.

I think the real thing is what it feels like, how much vibrations you get at the different rpm's, that will only be a feel thing.

Here is a simple chart for all the combinations so far:

Pulley sizes, rpm at 80mph, rpm diff from stock, pulley distance with stock belt (156T), teeth to keep stock distance
Stock 30/70, 4313rpm, 0rpm, 29", 156T belt
31/70, 4174rpm, -139rpm, 28.87", 156T (stratoliner front pulley)
31/66, 3935rpm, -378rpm, 29.47", 156T (stratoliner front and raider rear, believe raider rear works see mixed info, maybe victory belt)
31/65, 3876rpm, -437rpm, 29.61", 154T (stratoliner front and HD softtail 90's rear, victory belt, stock belt should just fit)
30/65, 4005rpm, -308rpm, 29.74", 154T (stock front, HD softtail 90's rear, victory belt)
32/70, 4043rpm, -270rpm, 28.74", 156T (warrior front pulley)
32/66, 3812rpm, -501rpm, 29.34", 156T (warrior front pulley, raider rear pulley)
 

·
Registered
Joined
·
12 Posts
SO I am looking to do this to my 950 does anyone have what year or models work to swap mine is 2011 v star 950 what pulley will fit to go from 30 tooth to 31 or 32
 

·
Registered
Joined
·
16 Posts
Discussion Starter #17
The 32 tooth will work from the RoadStar warrior but you will need to use spacers as I posted earlier in this post.

Sent from my SM-G975U using Tapatalk
 

·
Registered
Joined
·
4 Posts
Just wondering what changes you noticed from stock 30T on V Star 950. I recently installed a 31T on my 2015 950 Tourer and am happy with result of less vibration at 70 + miles. I still have plenty of power on take off and other gears. Thanks.

I just joined and for some reason didn't see there was a page 2 on same thread. :frown: Page 1 ended with your post from May saying it works. I already read comments related to that. Thanks anyway for your input on thread. I will be doing the change to a 32 when I find one.
 

·
Administrator
Joined
·
13,697 Posts
just swapped out the 30 tooth pulley on my 950 with a 31 tooth stryker pulley. no modifications needed to make it fit. tested my speedo with a GPS speedo app on my phone and the bike reads 5mph higher at 75mph; the app reads 70mph. i'm running a 180 rear tire versus the stock 170 size.
 

·
Registered
Joined
·
3 Posts
I know this has been gone over. I was wondering what year model warrior am I looking for to get a 32 tooth front (pully) sprocket to fit a 2012 950T? I know the 32 tooth RoadStar Warrior will fit with some slight modifications from what I have read. Like to lower the highway RPM down just a bit of possible. Thanks and God bless!?? Shrimper ?
 
1 - 20 of 22 Posts
Top