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Chain coversion for the Savage/S40 (Read 6576 times)
Kris01
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Re: Chain coversion for the Savage/S40
Reply #45 - 10/13/15 at 16:53:02
 
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2008 S40, Rotella T 15W-40 w/ZDDP added, Dyna, 140/90-15, Battery Tender Jr., Seat lift, #52.5/150/3 washers, Raptor
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Kris01
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Re: Chain coversion for the Savage/S40
Reply #46 - 01/16/16 at 12:36:28
 
Here's a chart I made showing different sprocket ratios. I only used ratios higher than the stock belt drive. You can change some of the numbers if you want lower gear ratios.

It won't upload an Excel file so I had to convert it to a .zip. Just right-click, "Save target as", and unzip and open the folder to reveal an Excel file.  Wink


Update: Made a few changes and corrected an error. This is the newest version.
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« Last Edit: 01/22/16 at 17:24:20 by Kris01 »  

There's no problem that a full tank of gas and a sunny day can't fix!

2008 S40, Rotella T 15W-40 w/ZDDP added, Dyna, 140/90-15, Battery Tender Jr., Seat lift, #52.5/150/3 washers, Raptor
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Re: Chain coversion for the Savage/S40
Reply #47 - 05/13/16 at 15:07:07
 
Just converted to chain.Went really tall. 40/17. I used JT sprockets, RYCA stainless spacer (outboard of countershaft sprocket) original locking washer etc.
Over the last half century I've had seven bikes, 4 chains, 2 shafts, and 1 belt. Mt last chain, a 650cc Yamaha Twin XS-650 was a perfect candidate for gearing up. It turned 4000 rpm @ 60 mph and was truly tiresome trying to cover much ground. In stages (as chain and sprockets wore out) I'd gear up even higher than before, finally ending at 19/30 (after starting at 17/34). This brought my rpm at 60 mph from 4000 to only 2700. @ 60mph I had the same rpm in 3rd gear I use to have in 5th! I had given myself 2 overdrives. It was great for fuel economy and comfort. Once, with a straight face, I told the owner of a 1050cc, 6 cylinder Honda CBX that I did it so I won't hit red line in 5th until I was going 130mph. As his jaw dropped and his eyes widened I said, "JUST KIDDING!" Anyway, it is with this experience as a backdrop, I decided to go really tall at first. I figured that a 530 chain will last just about forever coping with about 31hp and 33 lb/ft of torque, and if I didn't get it right the first time, I might not be able to wear out the set in this lifetime. Secondly, My XS650 was in a much higher state of tune than the S-40, producing 81hp/liter where the S-40 supplies just 48hp/liter. As is the case with low stressed engines, the torque peak occurs at a greatly reduced rpm. In this case 3400rpm. This made the bike ideally suited to such tampering.(I hoped) Well I got lucky, it's a very civilized machine on the open road and my wife even likes it better around town (for some reason). I get 66 mpg @ 55mph and 56mpg  at 65 to 72 mph. At high speeds it's a tolerable tingle instead of a belligerent buzz at the grips. In town I can expect about the same milage as I get at high speeds.
From a standing start, keeping rpm moderate, I ride the clutch to about !0 mph, after that everything's the same. Doing this I don't make an obstacle of myself in traffic or feel that I'm torturing the clutch unmercifully. In a residential neighborhood when school is letting out or there are witnesses about (when you're behaving yourself), the tightest turns or U-turns are best executed in 1st gear least you sound like the little engine that (almost) could.

I do have a few questions for members.
First, I've located a few sources indicating the S-40 turns 3940rpm at 60mph. Here I read 3733rpm. Has the final gearing changed?
Second, has anyone used the Trywin D1 GPS computer on their S-40? I understand it works with PC's and "supports" whatever. All I need is something to clamp on my handlebar and give me my speed and distance. It's simple and cheap. Any data on this or any other low-buck GPS handlebar computer or even a normal speedometer would be greatly appreciated. The speedo is even more useless now than it was before since I wear a full coverage helmet and don't feel safe doing a bobble-head routine in Phoenix traffic.I hope to hear reaction or feedback soon. (if I don't get my as killed 'cause I left my turn signal on)

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Kris01
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Re: Chain coversion for the Savage/S40
Reply #48 - 05/13/16 at 23:20:29
 
1987-95 4-speed ratios:
Primary 1.888 (68/36)
Secondary (belt) 2.956 (68/23)
2.2143 (31/14)
1.5000 (27/18)
1.0952 (23/21)
0.8750 (21/24)

1996-2016 5-speed ratios:
Primary 1.811 (67/37)
Secondary (belt) 2.956 (68/23)
2.3333 35/15
1.5789 30/19
1.1429 24/21
0.9565 22/23
0.8846 23/26

You can figure RPMs with:
mph  X  336.1524  X  (Primary x Secondary x TransGear) ÷  tire diameter

You can find tire diameter with this (using a 140/90-15 as an example):
(Section width x (aspect ratio / 100) / 25.4 x 2) + wheel diameter
(140 x (90 / 100) / 25.4 x 2) + 15
= 24.9213" tall
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There's no problem that a full tank of gas and a sunny day can't fix!

2008 S40, Rotella T 15W-40 w/ZDDP added, Dyna, 140/90-15, Battery Tender Jr., Seat lift, #52.5/150/3 washers, Raptor
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Kris01
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Re: Chain coversion for the Savage/S40
Reply #49 - 05/14/16 at 10:11:57
 
I just realied what ratio you are using. 2.35:1!!!

Most guys have a difficult time with 43/17 (2.53:1). Have you modded the engine to compensate for the extremely high gearing? I assume your clutch will probably wear out a little faster because you are slipping it more than usual.
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There's no problem that a full tank of gas and a sunny day can't fix!

2008 S40, Rotella T 15W-40 w/ZDDP added, Dyna, 140/90-15, Battery Tender Jr., Seat lift, #52.5/150/3 washers, Raptor
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Re: Chain coversion for the Savage/S40
Reply #50 - 05/14/16 at 16:28:48
 
or even more accurately,
1.measure wheel/tire circumference times 4 then divide by 4 (to minimize      the effect of inaccuracy of the measurement) =  6.04425 ft.
2. divide the distance travelled in a minute (5280 ft.) by the wheel/ tire circumference (6.04425 ft.) to arrive at the wheel/tire revolutions per mile.(also revolutions per minute) 873.5575 full circles.
3.multiply primary drive X secondary drive X 5th gear ratio,
1.811 X 2.956 X .8846= 4.73554 number of engine revs pre wheel/tire revs.
4.multiply wheel/tire cycles per mile (and per minute) X engine revs per wheel/tire revs to get revolutions per minute 873.5575 X 4.73554=4136rpm
5. divide new secondary ratio by original secondary ratio=2.35294/2.95652 = .79584
6. multiply this value X calculated original rpm @ 60mph to get the new value .79584 X 4136.7664 = 3292.236 rpm @ 60mph (revised)

What my driver-ed teacher referred to as "jackrabbit starts" a half century ago, are a thing of the past. But I don't miss them. (I'm an old fart after all) The jury is still out on the clutch though.

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Kris01
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Re: Chain coversion for the Savage/S40
Reply #51 - 05/14/16 at 20:11:23
 
That's waaay too much work!  Grin

Using my way won't be "dead on" accurate (because of tire mfr's tolerances) but you'll only be off by 2 or 3 RPM. Close enough for me.
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There's no problem that a full tank of gas and a sunny day can't fix!

2008 S40, Rotella T 15W-40 w/ZDDP added, Dyna, 140/90-15, Battery Tender Jr., Seat lift, #52.5/150/3 washers, Raptor
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Re: Chain coversion for the Savage/S40
Reply #52 - 04/25/17 at 04:39:50
 
I have investigated the measurment that is needed to replace when it is a chainconversion. The old frontpulley on my 1994 Savage had the measurment on the driveaxle of 15 mm. I bought a lasercut frontsprocket from a producer called SNELL and the sprockets productnumber is:SNELL SNF513-17T1 and this sprocket is 8,8 mm wide so I made a spacer from harder steel and the measurment of that is outside diameter:40 mm (it is ok for the 17 tooth sprocket), inside hole:25mm and width: 6,2. I payed 250 Skr, about 29 US dollar and they made me 2 spacers so I have one in reserve.
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Re: Chain coversion for the Savage/S40
Reply #53 - 05/04/17 at 08:01:21
 
I have made the conversion and it only took 2 hours to change the whole thing. The spacer was exact what the chain needed and after cutting the chain I was very happy looking at the old parts laying at the floor. Many thanks for the info about how thin the chain needed to be so I bought a 500 chain and everything could be mounted back as it has been.  Smiley
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Re: Chain coversion for the Savage/S40
Reply #54 - 06/01/17 at 12:42:30
 
Just ordered a 14t front sprocket. The 17t is way too tall for me and style of riding. Takes forever just to get up to a decent speed!  I'll be sure to report back!
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Re: Chain coversion for the Savage/S40
Reply #55 - 06/02/17 at 08:56:06
 
You may find that the 14T CS will make contact with the swingarm under normal riding conditions. I know your swingarm is modified, but my unmodified swingarm and 18/52 sprockets will make chain contact if the shock is extended beyond 13-1/4".
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Re: Chain coversion for the Savage/S40
Reply #56 - 06/03/17 at 07:33:30
 
Thanks Gary for the info. Correct my swing arm is modified with all tabs/brackets removed. Just more curious on if anyone has ridden the LS with a 14/43 setup. I expect it to be a lot more torquey!
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Re: Chain coversion for the Savage/S40
Reply #57 - 04/11/18 at 13:09:50
 
I did the conversion today, sprockets 16-44 and the chain will occasionally hit the swingarm because I have 320mm rear shocks. Glued a plastic slider in there, hope it works.
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Re: Chain coversion for the Savage/S40
Reply #58 - 04/11/18 at 13:48:36
 
Two even numbered sprockets -not the best for wear.
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Re: Chain coversion for the Savage/S40
Reply #59 - 04/12/18 at 07:01:07
 
batman wrote on 04/11/18 at 13:48:36:
Two even numbered sprockets -not the best for wear.


So I've heard. Not too much odd sizes available when sprocket size increases, going to replace those 16 and 44 with 18 and 52. Hope the chain will clear the swingarm then.

And for the spacers: Two M24 flat washers is just the right thickness. 1 inch should work, too.
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