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 Problems with the J Costa Variator

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5 posters
AuthorMessage
The Scootist
Silver Wing Expert
Silver Wing Expert
The Scootist


Number of posts : 693
Age : 66
Location : Loveland, Colorado
Points : 6241
Registration date : 2009-01-23

Problems with the J Costa Variator Empty
PostSubject: Problems with the J Costa Variator   Problems with the J Costa Variator I_icon_minitimeSat Nov 06, 2010 7:36 pm

Well, It looks like it is my turn to have problems with the J Costa variator. I had recently noticed a drastic drop in my gas mileage (to only 40 mpg), so I was concerned. Then, when I took my bike in for the 20,000 Mile service today they found scoring on the faces of the variator plates and an oil leak in the rear unit. I know that several others on here have recently had problems with their J Costa variators and had switched back to the Honda original equipment with the Dr. Pulley Sliders. I think that is what I want to do (at least for now). Do the sliders come in different weights? I wanted to ask you guys what combination of slider weights would provide the best combination of good gas mileage and acceleration. Any suggestions?
Thanks
DCC
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honda_silver
Silver Wing Guru
Silver Wing Guru
honda_silver


Number of posts : 2453
Location : Georgetown, Tx
Points : 8160
Registration date : 2008-12-23

Problems with the J Costa Variator Empty
PostSubject: Re: Problems with the J Costa Variator   Problems with the J Costa Variator I_icon_minitimeSat Nov 06, 2010 9:06 pm

The Scootist wrote:
Do the sliders come in different weights? I wanted to ask you guys what combination of slider weights would provide the best combination of good gas mileage and acceleration.

http://www.buggypartsnw.com/home?page=shop.product_details&flypage=flypage.tpl&product_id=386&category_id=32

26 and 28 gram.

26 gram for more performance
28 gram for more MPG

Or you could also trying evenly mixing half-and-half for a 27 gram (average).
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tankyuong
Silver Wing Rider
Silver Wing Rider
tankyuong


Number of posts : 475
Age : 49
Location : Missouri
Points : 6086
Registration date : 2009-07-12

Problems with the J Costa Variator Empty
PostSubject: Re: Problems with the J Costa Variator   Problems with the J Costa Variator I_icon_minitimeSat Nov 06, 2010 9:32 pm

I went back to 28g dr pulleys and didnt like it at first but now I like it
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DennisB
Silver Wing Guru
Silver Wing Guru



Number of posts : 2778
Age : 73
Location : NE Oklahoma
Points : 8886
Registration date : 2008-12-28

Problems with the J Costa Variator Empty
PostSubject: Re: Problems with the J Costa Variator   Problems with the J Costa Variator I_icon_minitimeSat Nov 06, 2010 9:36 pm

I was just wondering if my J-Costa could be re-surfaced on my small lathe....Well here it is and it fits....So I Got her done. I took a short video of the variator turning, Sorry, no sound, I must of had my big fat finger over the mic on the camera.

Set my lathe at 14 deg's and just shaved the high spots down on the surface.

https://www.youtube.com/watch?v=MaL4RaWM56c
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MaxB
Touring Scooter Rider
Touring Scooter Rider
MaxB


Number of posts : 302
Age : 72
Location : Indiana
Points : 5674
Registration date : 2009-10-06

Problems with the J Costa Variator Empty
PostSubject: Re: Problems with the J Costa Variator   Problems with the J Costa Variator I_icon_minitimeSat Nov 06, 2010 10:40 pm

good job Dennis!!!!!!!!!!!!

MaxB
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DennisB
Silver Wing Guru
Silver Wing Guru



Number of posts : 2778
Age : 73
Location : NE Oklahoma
Points : 8886
Registration date : 2008-12-28

Problems with the J Costa Variator Empty
PostSubject: Re: Problems with the J Costa Variator   Problems with the J Costa Variator I_icon_minitimeSat Nov 06, 2010 10:58 pm

Ok, Now I know...The sound is not working on my old laptop. That's the reason of no sound when I loaded this video up. Just something else to work on. O'well.
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DennisB
Silver Wing Guru
Silver Wing Guru



Number of posts : 2778
Age : 73
Location : NE Oklahoma
Points : 8886
Registration date : 2008-12-28

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PostSubject: Re: Problems with the J Costa Variator   Problems with the J Costa Variator I_icon_minitimeSun Nov 07, 2010 7:44 am

bigbird,

As a Designer, stacking up tolerances is what I do best.

Just shaved the high spots down and dressed the new surface with a little light emery cloth. Also took off a little on the end of the J-Costa's center hub so the Honda part of this drive will move over a very small amount to compensate for the material I removed off the J-Costa's drive surface. I was thinking of installing a thin spacer on the Honda drive shaft to bring the entire drive assembly over just a little. This may not be needed. I'll look at it when I get in to it.

Thank you for taking an interest in is project.

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DennisB
Silver Wing Guru
Silver Wing Guru



Number of posts : 2778
Age : 73
Location : NE Oklahoma
Points : 8886
Registration date : 2008-12-28

Problems with the J Costa Variator Empty
PostSubject: Re: Problems with the J Costa Variator   Problems with the J Costa Variator I_icon_minitimeSun Nov 07, 2010 8:11 pm

Well, I re-installed the J-Costa today after the face refinishing of last night and taking off 50 thousand off the J-Costa's Center slider barrel, this morning. I also did a little experiment...I placed 1.5" long x 3/8" very light compression springs under 8 of the 16 pins and went for a ride.

I really love how much smoother the J-Costa makes the scooter fell at take off.

OK, here it is, at 70 MPH indicated the RPM's were at 5.7K. A bit better than 6K when I removed it a while back.

The purpose of the springs was to up the outward pressure on the pins at low to mid range speeds. When the Pins reach the full extent of their travel, at high speeds, the pressure on the pins becomes less. I think it worked! Since I purchased all 8 of the #6 compression springs Ace Hardware had in stock today, I will need to get 8 more springs and do a full test on this soon...So more to come.
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honda_silver
Silver Wing Guru
Silver Wing Guru
honda_silver


Number of posts : 2453
Location : Georgetown, Tx
Points : 8160
Registration date : 2008-12-23

Problems with the J Costa Variator Empty
PostSubject: Re: Problems with the J Costa Variator   Problems with the J Costa Variator I_icon_minitimeSun Nov 07, 2010 8:49 pm

bigbird wrote:
I'll wait until the fat lady sings (permanent snow) before I change the oil and put the Swing to sleep for the winter in my garage.

I never hear her sing Razz
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The Scootist
Silver Wing Expert
Silver Wing Expert
The Scootist


Number of posts : 693
Age : 66
Location : Loveland, Colorado
Points : 6241
Registration date : 2009-01-23

Problems with the J Costa Variator Empty
PostSubject: Re: Problems with the J Costa Variator   Problems with the J Costa Variator I_icon_minitimeMon Nov 08, 2010 10:18 am

Dennis:
I am very impressed with your ability to resurface the faces of your J Costa and I am curious how the reworked J Costa affects the performance (acceleration) of your bike. Does it feel as quick as it did before? Is it quicker that it was with the sliders?
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DennisB
Silver Wing Guru
Silver Wing Guru



Number of posts : 2778
Age : 73
Location : NE Oklahoma
Points : 8886
Registration date : 2008-12-28

Problems with the J Costa Variator Empty
PostSubject: Re: Problems with the J Costa Variator   Problems with the J Costa Variator I_icon_minitimeMon Nov 08, 2010 12:53 pm

I really just love the power and the smoothness of the J-Costa Variator and the only fault with it is the aluminum that they use is a little softer then what Honda uses. They should have machined a replaceable steel disc face into their drive.

This taking down the high spots and shorting the barrel did help bring the J-Costa back from the grave for me. I think it's something worth doing when the J-Costa starts to act up. I'm experimenting with using springs to push the pins out with a little more force for more mid range power with better fuel mileage is what I'm after.

Get a set of sliders and give them a try. I really like the J-Costa over the sliders.
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DennisB
Silver Wing Guru
Silver Wing Guru



Number of posts : 2778
Age : 73
Location : NE Oklahoma
Points : 8886
Registration date : 2008-12-28

Problems with the J Costa Variator Empty
PostSubject: Re: Problems with the J Costa Variator   Problems with the J Costa Variator I_icon_minitimeSat Nov 13, 2010 8:52 pm

Well...I gave it a try. After running the J-Costa with the turned down drive plate surface and soft compression springs under 8 of the pins it turned out that I will need to remove more material off the end of the barrel and place a spacer behind the J-Costa to move it out so it will line up with the driven face. I'll try this when I get a chance this winter. For the time being I went back to the original Honda variator and rollers. FUN, FUN, FUN!
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Problems with the J Costa Variator Empty
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