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SV650 gearing for Topeka?

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gpz11

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SV650 gearing for Topeka?
« on: June 23, 2009, 11:02:43 am »
Any ideas where to start?

Thanks!
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HAWK

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Re: SV650 gearing for Topeka?
« Reply #1 on: June 23, 2009, 09:09:28 pm »
Kinda depends on what you've got for engine and what configuration they run. If they run the fast turn 8 then a stock engine will run out of gear with a 15-46 but if they run the tight left turn 8 the that should be a pretty good starting point for a 2nd gen, if you're first gen you might want to go 45 since they don't like to rev as high.
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Paul Onley
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Burt Munro

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Re: SV650 gearing for Topeka?
« Reply #2 on: June 23, 2009, 11:12:33 pm »
Any ideas where to start?

Thanks!



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gpz11

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Re: SV650 gearing for Topeka?
« Reply #3 on: June 24, 2009, 07:15:28 am »
I'm still waiting for SRAM to come up with a derailleur to handle the power of the SV.

So I'll stick with the stock trans.

Thanks Hawk!
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HAWK

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Re: SV650 gearing for Topeka?
« Reply #4 on: June 24, 2009, 09:51:15 am »
Burt, you're going to top out about 30 feet into the front straight (or any other straight for that matter) but since that's about all that chain will be able to handle I guess you'll just have to deal with it. Stay tight to the inside and I'll try to not blow you off the track as I go by.
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Paul Onley
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George_Linhart

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Re: SV650 gearing for Topeka?
« Reply #5 on: June 24, 2009, 11:29:39 am »
When will we know what configuration they are going to use?
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HAWK

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Re: SV650 gearing for Topeka?
« Reply #6 on: June 24, 2009, 12:02:35 pm »
Not till they know which should be the day after the races. I believe CCS likes the fast turn 2 and the slow turn 8 but sometimes the track has logistical issues like last year when they couldn't get the equipment out to change the barriers due to water logged ground.
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Burt Munro

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Re: SV650 gearing for Topeka?
« Reply #7 on: June 24, 2009, 03:53:48 pm »
Burt, you're going to top out about 30 feet into the front straight (or any other straight for that matter) but since that's about all that chain will be able to handle I guess you'll just have to deal with it. Stay tight to the inside and I'll try to not blow you off the track as I go by.

I didn't show you my 80 tooth front sprocket!!

With a little tow I figure I can top out at about 107 mph!

Of course I'll need an 8 mile, flat straight and I'll only be able to hold it for about 200 yards!!
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Burt Munro

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Re: SV650 gearing for Topeka?
« Reply #8 on: June 24, 2009, 03:58:56 pm »
When will we know what configuration they are going to use?

I'm hoping to talk to Greg Williams (Race Director) tonight.  I'll ask if he has any info on the configuration.  Both races this year have used the faster turn 1 & 2 and the slower turn 8 & 9.
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HAWK

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Re: SV650 gearing for Topeka?
« Reply #9 on: June 24, 2009, 08:43:36 pm »
Burt, You better recheck your math.

That looks like a 12 you got on there, coupled with an 80 big ring my math says the motor makes a BIG BANG followed by lots of whimpering at about 63MPH.  :pop:

Like I said, keep it off to the side and I'll try to not blow you off the track with my whimpy little SV.
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Burt Munro

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Re: SV650 gearing for Topeka?
« Reply #10 on: June 29, 2009, 10:28:26 pm »
When will we know what configuration they are going to use?
Found out today that the July races at HPT will use the same configuration as the April and May races.

2.5 mile course - new turn 1 & 2, old turn 8 & 9.
« Last Edit: July 01, 2009, 12:34:11 pm by Burt Munro »
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George_Linhart

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Re: SV650 gearing for Topeka?
« Reply #11 on: June 30, 2009, 10:20:51 am »
OK, that is helpful.  Does anybody know if the new turn 1&2 will require dramatically different gearing vs. what could be carried on the old front straight?  Last year at HPT I just used BHF gearing and it was fine.  I am  worried that I may end up a bit undergeared on the new configuration.
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benprobst

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Re: SV650 gearing for Topeka?
« Reply #12 on: July 01, 2009, 09:20:38 am »
OK, that is helpful.  Does anybody know if the new turn 1&2 will require dramatically different gearing vs. what could be carried on the old front straight?  Last year at HPT I just used BHF gearing and it was fine.  I am  worried that I may end up a bit undergeared on the new configuration.

We were using BHF gearing on Hernans 90 hp SVs to start, and as far as straightaways go we were just fine. For our set up it put the bike between gears in a few places so we changed it around. But on a duc I think BHF gearing is  good place to start. HPT front straight is longer than BHF but the corner leading onto it is much, much slower. (1st gear at HPT on my R1 as opposed to I think 3rd gear at BHF)
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123user

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Re: SV650 gearing for Topeka?
« Reply #13 on: July 01, 2009, 10:09:39 am »
George,
I ran 16/42 on my 1000ss in april.  Just barely saw 8K in 6th over the top of the hill.  Given your HP and close-ratio tranny, I'd expect 16/38 to be about right for you.
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