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Old 08-16-2010, 10:23 PM   #1
Dragonysr
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New CRF 100.... new questions......

I'm new to the boards but as I'm poking around in here I see that I know a few of you from TMGP. I've been racing YSR's, my NSR and a KX 65 for a few years.... Crashed pretty bad the end of '08. Sat out (unwillingly) for '09 and this year but just got a new bike to start wrenching on.

So first up....... Gearing. I did a search and didn't really find a solid answer with who was running what. The bike is gonna be mostly stock for the last 2 races (16's, pipe, stock carb, air filter) I'm thinking 15/48 or 15/46.......

Is this a good place to start?
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Old 08-16-2010, 11:18 PM   #2
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Yep.

In the past - people have showed up with stock CRF100s sitting on 16s with Bridgestone BT45s and podiumed... not dominated - but podiumed.

You'll be fine.

As far as sprockets go - get a hold of 13/14/15/16 Front & 42/44/46 Rear, you'll be fine on both TMGP tracks.
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Old 08-17-2010, 07:32 AM   #3
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Thanks! I really needed a good starting point on the gearing. I have probably 20 sprockets for my YSR and NSR. Once I found the right ratio the other sprockets don't get used. I didn't want to spend a ton of money again.

I'm trying to get a 16 front off ebay right now. I've found a couple but they've been to expensive.

I guess my next question would be carb and pipe combo. I haven't done alot of homework on this one. Is the BBR pipe all it's cracked up to be? How about a CHP? The Yosh is cool look'in but "cool" doesn't win races. I'm gonna try and stay away from FMF (personal preference) but if it works then hey......

Gonna stick with the stock carb for know and maybe get a PD62 later on.
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Old 08-17-2010, 04:20 PM   #4
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Try sprocket specialists. I get mine there. Good prices and quick delivery.

Look at Leo vince for your pipe, or pro circuit.
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Old 08-17-2010, 04:29 PM   #5
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I thought about SS. I've bought alot of stuff from them in the past. Good sprockets!!

I looked at the Pro Circuit SS pipe...... Has anyone ever Dyno'ed a bunch of pipes? BBR has a chart for theirs on the site.
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Old 08-17-2010, 04:48 PM   #6
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Try http://mmracing.biz/

Cam usually posts up his builds. He also has a sweet deal on some 17's for the xr on the main page
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Old 08-17-2010, 05:23 PM   #7
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Old 08-17-2010, 11:38 PM   #8
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I like the Carbon can but I think I'm gonna go with Aluminum. So far I'm leaning toward Pro Circuit or Yosh.

Dig the 17s but I'm not ready to fork over the cash just yet.
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Old 08-18-2010, 04:29 PM   #9
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We run our XR/CRF 100's with the factory gearing (i think it 15/50) at Katy. The bike tops about about the time I hit the brakes into turn 1. For endurance, you might wanna change out the rear to a 48 or 46, just to be a little easier on the motor on the straight.

I haven't been to Denton, so I can't comment on that track.

Jacob (Zimm11) did a cam, pipe and carb that seam to work pretty well together. You might want to drop him a PM and ask about his set up.
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Old 08-19-2010, 12:19 PM   #10
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Quote:
Originally Posted by Deano3090 View Post
We run our XR/CRF 100's with the factory gearing (i think it 15/50) at Katy. The bike tops about about the time I hit the brakes into turn 1. For endurance, you might wanna change out the rear to a 48 or 46, just to be a little easier on the motor on the straight.

I haven't been to Denton, so I can't comment on that track.

Jacob (Zimm11) did a cam, pipe and carb that seam to work pretty well together. You might want to drop him a PM and ask about his set up.
Thanks for the info. I think I'm gonna try 15/46 and see where I'm at. I'm prob not going to make Denton so I won't get to try it out there but Katy and then GSS in November for sure. GSS is gonna be a hard track to gear for. Hopefully I'll have my engine bits and pipe by then.

Last edited by Dragonysr; 08-19-2010 at 12:23 PM.
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Old 08-19-2010, 12:28 PM   #11
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Quote:
Originally Posted by Dragonysr View Post
Thanks for the info. I think I'm gonna try 15/46 and see where I'm at. I'm prob not going to make Denton so I won't get to try it out there but Katy and then GSS in November for sure. GSS is gonna be a hard track to gear for. Hopefully I'll have my engine bits and pipe by then.
Zimms 100 ran neck and neck with my CRF150F on the straights at GSS, maybe 53-55MPH. Just bring it out for a parade laps and try out your gearing. Or bring it out all day and run lightweight on it and get it all settled. I think both our bikes had a lot more speed, but were gearing limited. I need to find a sprocket for the 150 to see what it will pull on GPS. GSS is a track where top speed and handling are way more important than acceleration for an under 150cc bike. I can't wait to race the 65 there!
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Last edited by Mr.P; 08-19-2010 at 12:30 PM.
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