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Old 06-23-2007, 05:15 AM
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Default sprockets(need help)

     

ok,im looking an buying new sprokets for my 99 honda xr250.
i found some pbi sprokets on ebay for a pretty good price. my stock sproket gearing is 14t front 48 t back,i do alot of different kind of riding,trails,hillclimbing and i do jumps and what not,which gearing would you suggest?
heres my options
rear sprocket
1)48t
2)41T
3)43t

front sprocket
1)13t
2)14t
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Old 06-23-2007, 11:14 AM
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Default Re: sprockets(need help)

I cant imagine you needing any lower gearing on an xr250 if you are riding anywhere under 5000 feet. The 6 speed in mine, allows for gears plenty low enough to climb anything.

I would go for the 48 and buy a 13 and 14 tooth countershaft sprocket.
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Old 06-23-2007, 11:15 AM
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Default Re: sprockets(need help)

Quote:
Originally Posted by ossagp1 View Post
I cant imagine you needing any lower gearing on an xr250 if you are riding anywhere under 5000 feet. The 6 speed in mine, allows for gears plenty low enough to climb anything.

I would go for the 48 and buy a 13 and 14 tooth countershaft sprocket.
I concur.
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Old 06-24-2007, 03:07 PM
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Default Re: sprockets(need help)

ok thanks guys.
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Old 06-24-2007, 05:34 PM
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Default Re: sprockets(need help)

Are you unhappy with your stock (current) gearing? Those others seem like a huge gear change.
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Old 06-25-2007, 04:50 PM
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Default Re: sprockets(need help)

i was thinking maybe a change would be good,but i relized it wont be cause its geared perfect for my type of riding. i just want more power.
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Old 06-25-2007, 05:12 PM
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Default Re: sprockets(need help)

XR250's are lacking in the power dept. I've never messed with one, so I can't be of much help in trying to coax some more juice out of yours but someone here might know a thing or two about a thing or two.
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Old 06-25-2007, 05:34 PM
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Default Re: sprockets(need help)

If you want more power, I would start with the air filter. Get a UNI etc. The cover can go too. The stock pipe is as good as it gets if you want it quiet. It can be uncorked, but it is heavy. I use two pipes on mine. A D and D for an area where noise is not a concern, and a supertrapp ear where it is a concern. The stock carburetor can be replaced with a 30 or 32 mikuni. I replaced mine with an EI and had a mikuni too. For hp the mikuni is just as good.

Mine also is bored to a little over 270 with a little more compression. If yours is feeling at all worn, the big bore kit and a really good valve job with proper angles and seat widths means more to me than a hotter cam. I have tried two cams besides stock and I like stock best for this bike. In a minute someone is liable to come by and tell you to just take it to an auto shop and have them do the valves like he plans to do on his crf450. Do that when you are tired of the power yours currently has and want to drop a few horses.

So if that gives you some ideas, give them a try.
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Old 06-25-2007, 10:28 PM
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Default Re: sprockets(need help)

grinding out the welds inside the stock headers to complement the opened airbox is also a popular free mod worth the effort
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Old 06-25-2007, 10:59 PM
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Default Re: sprockets(need help)

you know I keep hearing that (the welds) and it didnt do much for mine. In that you can't even feel it if that is all you do, but I do keep hearing great things about doing that. I guess mine just wasn't bad enough for it to do a whole lot. I have an XR500 header pipe from one of my early ones. It goes right on with some stud spacers. Inside diameter is about the same as the stock xr250, but the collector is much larger. It helped the hottest of the cams I have, but didn't help the other cams, actually took some off the response from 1/4 throttle up.
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Old 06-25-2007, 11:29 PM
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Default Re: sprockets(need help)

I'll admit that i actually did the welds and airbox mods at the same time.
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Old 06-26-2007, 12:21 PM
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Default Re: sprockets(need help)

i just bought a k&n filter for my bike but didnt get it yet. my baffle is out and the bike sounds pretty good but ill probably be saving up for a new exhaust so i can get some more power.i was thinking about getting an fmf power core 4 or al bakers xr's only exhaust.
id love a new carb but they are like 400 bucks
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Old 06-26-2007, 12:25 PM
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Default Re: sprockets(need help)

ossagp1,your saying i should remove my airbox cover? it sounds like it would be a good idea for more power BUT id be worried about something getting in there and ruining my engine.
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Old 06-26-2007, 02:24 PM
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Default Re: sprockets(need help)

depends on where you ride, I guess I should call it a snorkel and not a cover though. Mine goes back on when I am riding in water.

A mikuni can be had easily for under 200 dollars. With yours uncorked you probably need some richer jetting topside at least. To be honest I didnt keep the stock exhaust on my 95 long enough to do much playing with it. Ditto the carburetor. Mine went back together as the big bore version so my jetting would have probably seemed rich with stock jetting.

On carburetors again: The Edelbrock is a tad bit better than the Mikuni, but not really worth it. No real performance gain, I don't really like the pump circuit all that much for my riding, and it weighs as much as my boots. (a little exageration). Probably the best bet would be to get one from a yamaha yzf etc and play with that. I doubt I ever will. My xr has gotten about to the point I am going to leave it and move on to some other projects. It is just about right as a trail rig now.
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Old 06-26-2007, 03:12 PM
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Default Re: sprockets(need help)

pmed you.
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