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Old 06-29-2012, 08:14 AM   #1
Ek
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Sumo gearing for the track?

I just picked up a 2006 YZ450f and need to know what is tre proper gearing for a track like MSRH and do I need to change it for GSS. I am about to go check and see what size the front is now, the rear is a 49. Help please, I would hate to blow the thing up on my first outing.
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Old 06-29-2012, 12:30 PM   #2
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Pretty much the same as a street bike 14-16 tooth front sprocket, and 43-53 tooth rear. 49 is a good in between size, with a 15 or 16 tooth front. It will be low enough geared you just wont have near the top speed you are use to.
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Old 06-29-2012, 01:28 PM   #3
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I did a quick search and copy and pasted what ai found here. If it was my bike, I would run 15 front and the smallest back I can find but try something around a 45.

13/49 Stock


2006 yz450f and was wondering what is the ideal all around sumo gearing? i was thinking to run 14-15 to 39-41.
anyone have any suggestions?


for the 06+ 13/45 will go 80 in a hurry ratio is 3.46 nice for the tight ones
13/43 will go 95 3.307
14/45 will go 100 3.21
14/43 110 3.07
15/43 ???????? 2.86 fast but not quick
mph not perfect
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Old 06-29-2012, 01:29 PM   #4
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He might run into some clearance issuse with a 16 front.
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Old 06-29-2012, 01:33 PM   #5
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Copy and pasted here from Thumpertalk.
cart tracks use around 14/44 {3.142} very close to 15/47 {3.133} but try and run the bigger front and smaller rear even if its the exact ratio the smaller rear and larger front work better for SM .
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Old 06-29-2012, 01:48 PM   #6
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Thanks, I will be ordering some sprockets to test out. I have a few other issues to work out first before it will be track ready, an oil leak being first on the list. They joy's of used bikes.
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Old 06-29-2012, 04:56 PM   #7
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Last time at GSS I ran 14/41. It was a tad too tall for my liking. It was the closest i could get without buying more new sprockets. Regardless of what gear ratio you run, you will have a laugh. That's what its all about
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Old 06-29-2012, 05:23 PM   #8
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Send Hiside a PM he has a Yami and might be able to help you with your setup-but you'll still never catch him.
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Old 06-29-2012, 07:40 PM   #9
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I've been running 14/42 at GSS with my 04 wr450, but I'm going to switch it to 15/42 so I don't have to spin the motor up as much at the ends of the straights.
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Old 06-30-2012, 08:44 AM   #10
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At GSS I run a 15/45, aT MSRH, all I had was a 43 but it was topped out on the short course way too soon. I could have probably used a 41 or 40, but I would have had to cut the chain. The 16 in the front does have clearance issues on mine.
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Old 06-30-2012, 11:06 AM   #11
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I always used this site to play with my gearing combinations before committing to any particular gearing combo. http://gearingcommander.com/
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Old 06-30-2012, 01:39 PM   #12
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14/41 for me at gss
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Old 07-01-2012, 02:22 PM   #13
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I would rather run tall gearing. I dont want to be bouncing off the topend and risk blowing something up. I think Racer997 has been in the sumo game longer than most and might have some really good imput on this.
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Old 07-01-2012, 05:29 PM   #14
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Thanks guys, I will be ordering a front 15 and 14 just to be safe and as soon as I find out what bolt pattern the warp9 rims are a new rear sprocket too.
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Old 07-02-2012, 09:41 AM   #15
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Quote:
Originally Posted by Ek View Post
Thanks guys, I will be ordering a front 15 and 14 just to be safe and as soon as I find out what bolt pattern the warp9 rims are a new rear sprocket too.
I was running those on my 2001 yz250 and just swapping out the sprocket.
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Old 07-03-2012, 12:59 PM   #16
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I was running 16/42 on my SXV 550 at MSRH, and not hitting the limiter in 5th on the back straight. Of course, the redline on that back is 10,500 and I was running a 180/60 (stupid tall) rear to get it to do that. Running 16/46 I could see the limiter if was in it to win it.
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Old 08-13-2012, 09:32 PM   #17
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Just got a 2005 RMZ450 supermoto. It's a 4 speed so gearing is going to be tricky. Never been out to MSRH or GSS, just moved here. What would ya'll recommend? Does MSRH ever let motards on there small kart track?
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Old 08-14-2012, 08:05 AM   #18
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Quote:
Originally Posted by mxrider14 View Post
Just got a 2005 RMZ450 supermoto. It's a 4 speed so gearing is going to be tricky. Never been out to MSRH or GSS, just moved here. What would ya'll recommend? Does MSRH ever let motards on there small kart track?
Never even thought about that..........good call.

Ring them up and see if you can make it happen.
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Old 08-14-2012, 09:00 AM   #19
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Quote:
Originally Posted by mxrider14 View Post
Just got a 2005 RMZ450 supermoto. It's a 4 speed so gearing is going to be tricky. Never been out to MSRH or GSS, just moved here. What would ya'll recommend? Does MSRH ever let motards on there small kart track?
split the motor, put in a five speed trans off a 06' and gear it to the moon. I never had the five speed but wish I had. I went through motors on that bike and ended up selling it. Now I have a ktm450smr.



I had one of these and the four speed leaves you trying to shift into 5th all the time. I cant remember what gearing I was running but you can run the same rear sprocket as a DRZ400SM. Run the smallest rear you can find for that and a 15 front. I think 14 front was stock. 16 you might have to grind down the chain gaurd on the front to clear the chain.
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Old 08-14-2012, 09:01 AM   #20
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Quote:
Originally Posted by wiayeman View Post
Never even thought about that..........good call.

Ring them up and see if you can make it happen.
I would ride this track, with you guys. I figure if anyone had a chance of making that happen it would be fastline.
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