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General Category >> Rubber Side Down! >> s40 needs
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Message started by bill67 on 09/13/07 at 04:32:47

Title: s40 needs
Post by bill67 on 09/13/07 at 04:32:47

after 22 bikes in 35 years this bike needs 1 inch more travel in shocks the seat is realy not that bad and to turn 700 to1000 less rpm in high gear i think if someone made pulleys to turn less rpm they would sell like hot cakes the same belt would work the 5th gear feels like a passing gear ;)

Title: Re: s40 needs
Post by Savage_Rob on 09/13/07 at 07:20:06

bill67 wrote:

and to turn 700 to1000 less rpm in high gear i think if someone made pulleys to turn less rpm they would sell like hot cakes the same belt would work the 5th gear feels like a passing gear ;)

You might want to either try a larger rear tire or the chain conversion outlined in the Tech Ref forum.

Title: Re: s40 needs
Post by T-Mack1 on 09/13/07 at 08:21:39

I would like to see Suzuki offer a "fuel economy" kit that would have either a front pulley with one more tooth or a back pulley with few less and a different right angle adapter at the speedo to compensate for the ratio change. Such a small tooh change should be able to be comensated in the belt tightener.

Title: Re: s40 needs
Post by Savage_Greg on 09/13/07 at 10:37:17

I imagine that one reason the Savage40 hasn't changed in price since at least 2000, is because they haven't had a lot of engineers trying to reinvent the bike.

That's left for the enthusiast to do.

Gee, just imagine buying a more expensive bike like the C90. You'd never have anything to do except for installing "factory" parts and goodies. What's the challenge in that?

Title: Re: s40 needs
Post by Rockin_John on 09/13/07 at 15:22:03

T-Mack1 wrote:

If you added to the diameter of the front pulley, I doubt it would fit in the rather tight guard. If you change the rear pulley by enough to matter (3-4 teeth) I think you will get out of range of the axle's tension adjusters.

As previously mentioned, just increasing the diameter of the rear tire can make a noticeable difference in the highway gearing. However, as for gas mileage, I don't think my 99 with the bigger 140/90 rear tire gets any better mileage than my 87 with the stock 140/80 on it. But that may be entirely due to carb jetting or other factors.

Title: Re: s40 needs
Post by steely on 09/13/07 at 18:39:39

I have been thinking about this. Our belts appear to be made by Gates. If this is the case, I can get just about any pulley I need and the belt to make up for the smaller pulley. Over the next few months, I am planning to purchase a smaller pulley and get it machined to fit the bolt pattern. When I get this finished, I will let everybody know how it works. I am an engineer and use the Gates Polychain drives all of the time, I also have access to a machine shop.

Title: Re: s40 needs
Post by bill67 on 09/14/07 at 07:54:15

sounds good how much you think you can change the gearing

Title: Re: s40 needs
Post by steely on 09/14/07 at 14:06:03

Without going to a shorter belt, not very much. I will have to do some calculations before I will know exactly how many teeth I am going to try to take out of the rear sprocket.

It will not be a very quick process, I am really swamped at work right now and don't have much time to work on it. Once things even out a little I will have some time to figure out what is what.

Title: Re: s40 needs
Post by bill67 on 09/14/07 at 14:26:30

sound good about spoc kets and belt

Title: Re: s40 needs
Post by T-Mack1 on 09/14/07 at 20:32:25

Steely,
Any thoughts on some kind of speedo cable adapter to compensate??

Title: Re: s40 needs
Post by Rockin_John on 09/15/07 at 04:20:00

I think you will find that the belt on the Savage is not a Gates product, but a one-off proprietary product made specifically for Suzuki by Bando:

http://www.bandousa.com/

Just like the cam chain, it is as though Suzuki intentionally threw up compatibility roadblocks to prevent easy modification.

Title: Re: s40 needs
Post by barry68v10 on 09/15/07 at 06:12:15

For what it's worth, I did the chain conversion and went up 15% in gearing (lower numerically) and gained a corresponding 15% gas mileage...won't go back to stock gearing. MUCH better at 75 mph on the highway.

Title: Re: s40 needs
Post by Rockin_John on 09/15/07 at 08:40:10

barry68v10 wrote:

That has to be a pretty big change; because just the 3% up gearing of going from a stock 140/80 IRC to a 140/90 Dunlop makes a slightly noticeable difference.