View unanswered posts | View active topics It is currently Tue Jul 29, 2014 9:46 am



Reply to topic  [ 17 posts ]  Go to page 1, 2  Next
 TRN: Roller weights 
Author Message
Forum Admin
Forum Admin
User avatar

Joined: Sat Apr 07, 2007 10:08 pm
Posts: 6677
Location: Port Angeles, WA
Post TRN: Roller weights
Taken from a post by Dougman
I figured this deserved its own write up in an easy to find thread.

I received my set of variator rollers to tune the engine to run in the new pipe's power band.
First the easy part: Putting on the new pipe.
Image
There are only 4 bolts to take off when you take off the old pipe. two 10mm bolts under the engine , and two 12mm bolts on the side of the bike to mount the pipe. Just loosen the 12mm bolts first but don't take them out, then take out the 10mm bolts. Then finish removing the 12mm bolts to take the pipe off. Assemble your new pipe and bolt it back on the same way you took off the original pipe. Here I have the Technigas Next R pipe in Chrome.
When I first installed this pipe, it could barely reach 40kph without tuning. It was running about 30kph down the block. It was SLOW. I had to remove it before I can use it going to work because the traffic here run around 60kph normally.
Image
Here is my new set of Rollers for the Variator, 16x13mm rollers for my Athena Variator set. I believe a Variator is also called a CVT or Constant Variable Transmission. If you are not familiar with how a Variator works you can read it here complete with diagrams http://www.teamcalamari.com/zuma/variator.html .

This roller set is in sets of 3, whereas the variators use 6 rollers. So i can put 2 sets alternating to produce the weights I want. For example, if i put the 3g + 4g rollers, would end up with an average of a 3.5g roller set, or 5g+7g set will average to a 6g set. So for this set, I can get a range
of 3.5g to 7.5g.

Image
First remove the bolt from the kickstarter and then pull off the kickstarter (red arrow), then use the oversized screwdriver in your BWS and unscrew the 2 screws of the airbox(orange), and then the 3 screws on the plastic cover (yellow). The airbox should just hang off the carburator, and the plastic cover should come right off.
Image
You will need a 5mm allen key to remove these bolts. They are all shown in the picture. The two green bolts are longer than the orange ones, and the red one is the longest one. After getting all these bolts off, you have to rock the cover up and down to try to get it off. It is still connected by 2 sleeves in the holes where the green bolts were. Mine were rusted and it took a LOT of time and struggling to finally figure out where it was stuck.
Image

The rollers are located here in the front section. You will need a impact wrench to get that 17mm nut off. Here is a tip, if you don't have an impact wrench to do this, GET ONE. It took me 2 days of trying to figure out how to get it off without one, until I finally just bought one. They can be had for about $50. After you take the nut off, all the parts behind it can be pulled out. Take off the fan part, and remove the belt from axis. I would recommend just grabbing the rest of the parts behind the belt and pull it all out at once, to minimize all the rollers that fall out.
Image
I took out the original rollers, they were 7.5g rollers, and replaced them with 4g+5g rollers as seen in the picture. Then I put the entire thing back together the same way I took it apart.
Then test it! You have to go through all these steps over and over to change rollers, it is a HUGE hassle to do it and it takes A LOT of time. I didn't have time to test other combinations as I needed to return my tools. But as-is, it runs a lot better, and the scooter can accelerate up to 70kph at a reasonable pace. The noise it makes is louder and higher pitched as the rpms are higher than normal.

I will try other combinations if I have time later, but I am happy with the results so far.

I can reach 70kph within a 10-15 seconds on flats, and it seems that it will maintain the speed on hills, but cannot accellerate very well on hill from a dead stop (as expected). The change in RPM at different speeds is kinda odd, but good for me. It will run at high rpms and fairly ok acceleration from 0-20kph, then the RPM's will go low from 20-50kph, then it spins up again from 50 to 70kph. This is a LOT better than going 30kph. :D

_________________
Image
http://www.DubbyaDecals.com
lambo123 wrote:
The way i see it, the internet friendship is like a scooter in india. we got room Dub, if you want to be part of this show? IN the india, zuma, friendship scooter you got at least 5 to 6 spots. We got 3 full... in Mike, Bio, and me... and we are best friends... but we are looking for 2 more people to fill the full wolf pack.... Are you part of the pack?


Sun Jun 01, 2008 10:26 am
Profile YIM WWW
Zumaforums V.I.P.
User avatar

Joined: Thu Oct 18, 2007 6:38 pm
Posts: 3953
Location: Mohave Desert NW Arizona USA
Post Re: Roller weights
Fantastic write-up and pictures, thanks Dougman and Jdubbya!

_________________
Image


Sun Jun 01, 2008 11:39 am
Profile
Gold Member
Gold Member
User avatar

Joined: Sat Aug 18, 2007 5:23 pm
Posts: 2688
Location: Troutman, NC
Post Re: Roller weights
just like to point out that the '08 Zuma doesn't have the plastic tranny cover.

_________________
Racer: 2008 Yamaha Zuma, basically stock.
Daily Driver: 1991 Ford Ranger Turbo 2.3 RWD 5-Speed
Pleasure/ Gas Sipper: 2009 Suzuki SFV650, stock (but not for long)


Sun Jun 01, 2008 11:47 am
Profile WWW
Gold Member
Gold Member
User avatar

Joined: Sat May 31, 2008 11:04 pm
Posts: 1419
Location: Edmonds, WA
Post Re: Roller weights
This will be helpfull to me soon.. thanks

_________________
08' Blue Zuma YW50X / 1912 Miles / T-Mod / LeoVince ZX
Dual Headlights / JDM Fender / Malossi Brake Pads
Image
Gallery
My T-Mod Tut.


Thu Jun 05, 2008 10:44 am
Profile
Gold Member
Gold Member
User avatar

Joined: Thu Feb 21, 2008 7:24 pm
Posts: 2060
Location: Worland, WY
Post Re: Roller weights
[quote=jIThe change in RPM at different speeds is kinda odd, but good for me. It will run at high rpms and fairly ok acceleration from 0-20kph, then the RPM's will go low from 20-50kph, then it spins up again from 50 to 70kph.
[/quote]

This is a symptom of a weak torque spring.

_________________
2004 Honda Interceptor • 2013 Honda PCX 150


Fri Jun 20, 2008 5:25 pm
Profile
Silver Member
Silver Member
User avatar

Joined: Wed Apr 02, 2008 11:57 am
Posts: 947
Location: Harrisonburg, VA
Post Re: Roller weights
The_Head wrote:
This is a symptom of a weak torque spring.


or Contra spring if you wanna be fancy.

_________________
Yo <3 Tortuga_Tomasa
Image


Fri Jun 20, 2008 5:39 pm
Profile WWW
Newb
Newb

Joined: Sat Jun 28, 2008 9:11 am
Posts: 27
Post Re: TRN: Roller weights
i have a white and a yellow C springs, what are the ratiings on these?


Sat Jun 28, 2008 10:48 am
Profile
Gold Member
Gold Member
User avatar

Joined: Sun Aug 03, 2008 11:59 pm
Posts: 1063
Location: Huntington Beach, CA
Post Re: TRN: Roller weights
Thanks for the write up. Very informative as usual. Great work :waycool:

KillerXray

_________________
09 Zuma125-stock
05 Zuma50-rear bag-windshield-hlX2 mod
06 Mazda 3-stock
91 Honda Civic-project
69 Pontiac Firebird-future project

Image
MY GALLERY


Wed Aug 27, 2008 2:11 am
Profile
Silver Member
Silver Member

Joined: Fri Jul 18, 2008 4:22 am
Posts: 676
Location: Minnesota
Post Re: TRN: Roller weights
This is the thread I used when i started playing with my var weights! good stuff here! This should be stickied along with some other good threads.

Or a mod should make a sticky post of nothing but links to these articles with breif descriptions of each!
(that way people that don't like to search...should get it right in the first post) :haw:


Wed Aug 27, 2008 5:46 am
Profile
Scooter Addict
User avatar

Joined: Wed Aug 27, 2008 10:13 pm
Posts: 120
Post Re: TRN: Roller weights
wait so these steps you use will also work for an 08 zuma right? i'm guessing a BWS is just a zuma with a different name in a different region of the world??

_________________
I am currently not in possesion of any two wheeled vehicles, trying to rectify this very soon :)

http://www.spsegundo.com


Fri Sep 12, 2008 2:53 pm
Profile WWW
Gold Member
Gold Member
User avatar

Joined: Thu Apr 24, 2008 5:18 am
Posts: 1164
Location: Orlando, FL
Post Re: TRN: Roller weights
VEGAS_08ZUMA wrote:
wait so these steps you use will also work for an 08 zuma right? i'm guessing a BWS is just a zuma with a different name in a different region of the world??


functionally identical...


Fri Sep 12, 2008 2:54 pm
Profile WWW
Bronze Member
Bronze Member
User avatar

Joined: Wed Dec 10, 2008 12:29 pm
Posts: 367
Post Re: TRN: Roller weights
[quote=jIThe change in RPM at different speeds is kinda odd, but good for me. It will run at high rpms and fairly ok acceleration from 0-20kph, then the RPM's will go low from 20-50kph, then it spins up again from 50 to 70kph.
[/quote]

I had nearly the same problem, I am using an Athena contra spring that came with my variator, today i went from 3 x 4g and 3 x 6g to 2 x 4g 2 x 4.8g and 2 x 7.5g and it revs high all teh way to 45 MPH, very little change in RPM now, before it would scream up t0 15 mph, lose tons of rpm's and slowly build back up past 25-30 to 45.

Maybe try 2 x 4g 2 x 5 g and 2 x 6g to see if it gets rid of the midrange problem I thought I had a too weak contra spring as well, but this setup is me best yet- I hit 40 in less than on block now - before It would take forever to go from 15-25 and thats where I drive all day in 25mph speed limits - so I had to fix.

_________________
01 Vino, LV ZX, LV clutchspring yellow,30g rollers, athena variator, Athena contra spring, CF mirrors, #80 main jet, Nology hotwire, Mega snorkel .75" ID, pirelli SL 26, hell airhorn


Tue Apr 21, 2009 2:59 pm
Profile
Forum Admin
Forum Admin
User avatar

Joined: Wed Sep 10, 2008 9:15 am
Posts: 3351
Location: Phoenix, AZ
Post Re: TRN: Roller weights
Skateboard kid, you shouldnt be putting in 3 sets of two. Only 2 sets of three. Otherwise your weight balance is off and you can bend your crankshaft.

_________________
2005 Zuma 50, Under construction
Image


Tue Apr 21, 2009 3:31 pm
Profile YIM
Bronze Member
Bronze Member
User avatar

Joined: Wed Dec 10, 2008 12:29 pm
Posts: 367
Post Re: TRN: Roller weights
ok I can see how that works - I am back at 3 x 4g and 3 x 6g and am gettign the revs dropping all the way off at 20 mph and then from 30 on it pulls hard. I am thinking that my athena contra spring is crap, or has been toasted by long hot rides. My 0-15 if awesoem as well.

_________________
01 Vino, LV ZX, LV clutchspring yellow,30g rollers, athena variator, Athena contra spring, CF mirrors, #80 main jet, Nology hotwire, Mega snorkel .75" ID, pirelli SL 26, hell airhorn


Tue May 19, 2009 1:45 pm
Profile
Silver Member
Silver Member

Joined: Fri Jul 18, 2008 4:22 am
Posts: 676
Location: Minnesota
Post Re: TRN: Roller weights
If your still running a 50cc cylinder, 5's is too heavy. You need to average between 4-5...from the sounds of it less than 4.5.
I'm 200lbs and I was running an avg of 4.6/7grams per roller. 3.7 and 5.5
That setup was good for flats and lost a little going up steep hills, but any heavier or lighter I ran into huge power gaps. (hills or not)


Tue May 19, 2009 1:59 pm
Profile
Display posts from previous:  Sort by  
Reply to topic   [ 17 posts ]  Go to page 1, 2  Next

Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group.
Designed by STSoftware for PTF.