SuzukiSavage.com - Belt Pulley

jmerry Ex Member	Belt Pulley 09/27/06 at 14:04:12 Does anyone know if there is a larger belt pulley available for the LS650? This would "gear up" the bike slightly and allow for higher speeds with lower RPM's. I've seen the sprocket changed out on chain driven dirt bikes to acheive this. It would seem to be an easy mod if anyone had fabricated one and marketed it. Thanks!!
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Dynobob

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Re: Belt Pulley
Reply #1 - 09/27/06 at 14:46:45

jmerry wrote on 12/31/69 at 16:00:09:

Does anyone know if there is a larger belt pulley available for the LS650? This would "gear up" the bike slightly and allow for higher speeds with lower RPM's. I've seen the sprocket changed out on chain driven dirt bikes to acheive this. It would seem to be an easy mod if anyone had fabricated one and marketed it.

You want a smaller rear sprocket or a larger front sprocket. No I don't know of any being made. It would be a very good mod to have manufactured. Perhaps something from a different model Suzuki would fit ? ? ?

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jmerry

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Re: Belt Pulley
Reply #2 - 09/27/06 at 15:49:55

Either way would work, although the front drive pulley would be much easier. The only limitation would be room in the crank case housing, but there seems to be ample. It just seems to be a simple mechanical solution to a bike with LOTS of low end torque, but limitations on the top end due to high RPM's. Does anyone know if Dynobobs solution would work? Has anyone tried another bike's drive pulley? I'm dying to know if this would work or has been tried..

Thanks!!

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thumperclone Serious Thumper Alliance Member Offline PGR rider riding with respect Posts: 6865 Grand Junction Colorado Gender:	Re: Belt Pulley Reply #3 - 09/27/06 at 17:56:05 1 tooth front = 3 teeth rear if you ever find any get me one too!!!
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SavageDude Serious Thumper Alliance Member Offline Posts: 561 OC_California Gender:	Re: Belt Pulley Reply #4 - 09/27/06 at 22:18:59 Even if you manage to find the pulley mod, you will need a small diameter belt Another mod just to lower RPM.
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Odar Junior Member Offline Odars ride Posts: 93 Stockholm Sweden Gender:	Re: Belt Pulley Reply #5 - 09/27/06 at 22:52:16 For a bigger front pulley, anybody did the calculation, howe mutch bigger in dia. and howe many teth for 8-10 % change in RPM? For a little bigger front pulley you can always move the rear tire forward in the svingarm. Odar
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klx650sm2002 Serious Thumper Offline The more I learn the less I know. Posts: 2041 Cumbria,England Gender:	Re: Belt Pulley Reply #6 - 09/28/06 at 03:39:27 On My KLX I went from a 43 to a 46 which dropped top speed from 107 to 100, much better acceleration. Seems you guys want to go the other way. How many teeth on your pulleys, front and rear ? Clive W
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jmerry Ex Member	Re: Belt Pulley Reply #7 - 09/28/06 at 05:42:52 That's right. A larger front drive pulley, or a smaller rear. The difference needed to the belt could be made up by moving the wheel forward slightly in the swing arm. Not sure about the number of teeth on either pulley. I wonder if an HD pulley would work? I don't think there's another Suzuki bike that uses a belt drive.
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bentwheel

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Re: Belt Pulley
Reply #8 - 09/28/06 at 07:49:11

jmerry wrote on 12/31/69 at 16:00:09:

Either way would work, although the front drive pulley would be much easier. The only limitation would be room in the crank case housing, but there seems to be ample.

I doubt you could fit a larger front pulley. It is so tight in there, you have to remove the pulley just to remove the belt . Plus don't forget the belt will swell due to centrifugal force.

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LANCER

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Re: Belt Pulley
Reply #9 - 09/28/06 at 07:57:41

The rear pulley on a Savage has 68 teeth, 23 up front. HD's have a 65 tooth pulley but the bolt pattern is different. It should not be difficult to take one to a machine shop and have new holes drilled to match the Savage, and it would also probably need to have a bearing insert pressed in to match the axle size on the Savage. Easy stuff for a machine shop.

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jmerry Ex Member	Re: Belt Pulley Reply #10 - 09/28/06 at 08:08:34 Mmm.. Then that would leave a smaller rear pulley. Any of those around?
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Enfield_fan Ex Member	Re: Belt Pulley Reply #11 - 09/28/06 at 08:58:13 I still think the answer is a smaller primary drive sprocket on the right side of the transmission, with a correspondingly shorter primary drive chain.
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vroom1776 Serious Thumper Offline Posts: 2110 Gender:	Re: Belt Pulley Reply #12 - 09/28/06 at 09:04:17 Most HD belts are not as wide as ours, though.
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Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 29300 Tucson Az Gender:	Re: Belt Pulley Reply #13 - 09/28/06 at 09:58:26 I just went to a 90 profile tire to get a little gearing. Tight fit on a stocker, but I have 12.5" shocks.
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klx650sm2002 Serious Thumper Offline The more I learn the less I know. Posts: 2041 Cumbria,England Gender:	Re: Belt Pulley Reply #14 - 09/28/06 at 10:11:14 90 profile gives 4.6% more speed for the same engine revs. Going from a 68 to a 65 (if possible) tooth rear pulley also gives 4.6% more speed for the same revs. The two together gives 9.4%. Clive W
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