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Old 11-04-2010, 01:39 PM
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Exclamation Trail bike adjustment

Do any of you use a motorcross bike to perform trail riding. And if you do have you left the bike stock for this. sporckets and so forth. I have a 05 honda crf250r. Should I just leave it alone or adjust the sprocket (front or rear) to make this bike more trail worthy. This is my first bike.
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Old 11-04-2010, 01:54 PM
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you have trouble getting much larger sprockets. a 54 tooth and a heavier flywheel or weight may make you like it better. I think a revloc or rekluse clutch would make you happier, yet, but the cost is much greater.

if you want to go more than 54 you may need to order from someone like sprocket specialists etc. you will also have to modify your chain guide.

my crf250 now has a crfx lower end and transmission in it. makes a great trail bike.
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Old 11-04-2010, 02:26 PM
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ossagp,

I'm not sure the OP knows what he wants just yet. In this thread Woods riding he was asking about killing off some acceleration so I'm not so sure that going to a larger rear sprocket would be the way to go for him.

Maybe a flywheel weight and an auto clutch (Dyna Ring is the cheapest) would do the trick for him? That's basically what I'm doing to one of our CR250s. If I ever finish putting the thing back together that is. It's a 2002 CR250 with a Steahly flywheel weight, Rekluse Z Start Pro, FMF Gnarly pipe, Q Stealth silencer, Keihin PWK Airstriker. I have 14:51 sprockets for it which is very close to stock (13:48) ratio.
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Old 11-04-2010, 03:05 PM
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looky here

I dont have that kind of money. Ijust want something like I said in the other post something to cut the aceleration back or to help keep the front tire on the ground if a bigger spocket on the front will help let me know what you think the best tooth count would be thanks. I love the bike. Thats why I'm coming to yall who have an abundant knowledge of bikes.
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Old 11-04-2010, 03:34 PM
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the best thing i ever did in calming my cr250 down was add a 11 ounce flyheel weight. it helped keep me rom stalling all the time.

i wouldnt get an auto clutch, simply because they are pretty expensive.
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Old 11-04-2010, 03:44 PM
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Hang in there with us bud. Some of us are old and slow (< me).

Going one tooth larger on the front sprocket will help do what you want. Try a 14 tooth front sprocket. They don't cost much.

Here's another item that may help you. It doesn't look like much but you'll have to twist the throttle further to open up the carb. May be a help to you on rough ground. Moose Racing Billet Aluminum Throttle Tubes And Altered Ratio

Evidently Steahly doesn't make a flywheel weight for the CRF250R - just a heavier flywheel. It's not much more than what I paid for a weight for my CR though. Honda CRF250R 04-09, CRF250X 04-10 Complete Flywheel - Flywheel Weights

Anything else that I can think of offhand is going to involve opening up the motor and money. An X model cam will tame it down. An auto clutch will help you not stall it.

---------- Post added at 03:44 PM ---------- Previous post was at 03:36 PM ----------

Quote:
Originally Posted by ninjamonkey_16 View Post
the best thing i ever did in calming my cr250 down was add a 11 ounce flyheel weight. it helped keep me rom stalling all the time.

i wouldnt get an auto clutch, simply because they are pretty expensive.
I have a 10 oz weight on my bike now but I haven't ridden with it yet.

I used to think that I'd NEVER - and I mean NEVER - have an auto clutch in one of my bikes. I finally rode a friend's bike with a Rekluse (a CRF250 btw) and I loved it. Now I have a Rekluse Z Start Pro in the CR250 that my son races, a Revloc Dyna Ring in my KDX200, and a Z Start Pro waiting to be installed in my CR250. If I hadn't already bought the Rekluse clutches for the CR250s when I tried the Dyna Ring, at least one of them would have a Dyna Ring. The Dyna Ring is $220 less and does the same thing.
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Old 11-04-2010, 05:38 PM
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Cool

If I go up to a 14 tooth I shouldnt have to adjust my chain correct? I've herd from someone that putting an oring chain on his 2010 yzf450f slowed him down a little. Is that possible to do as well? or did he not really pay attention to his bike before hand?.....
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Old 11-04-2010, 05:46 PM
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Unless your chain is really short and just barely fits now, you will be able to install a one tooth larger front sprocket with no problem.

I've heard about the o-ring chain drag thing but, to tell you the truth, it's been so long since I rode a bike without an o-ring chain, I don't know if that's true or not. Plus I don't remember ever riding the same bike both with and without an o-ring chain. If I did I wasn't good enough, or wasn't paying close enough attention, to tell the difference.
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Old 11-04-2010, 05:52 PM
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Thanks for the help. I'll try that out. I'll let yah know something as soon as I try it out. Thanks again
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Old 11-04-2010, 06:20 PM
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keep in mind if you go up 1 on the countershaft sprocket you'll have to use the clutch a lot more if you ride in tight woods. you may want to look at a heavier flywheel rather than gearing up. you might check with some crf guys about changing the ignition map.

Last edited by YZ pilot; 11-04-2010 at 06:35 PM.
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