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Old 05-15-2013, 10:13 PM   #35551
Sewerat
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I running it tight to the front with 14/50 and now with 13/50 it's about 3-4 notches in. I'm running with a wide tire and no clearance issues
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Old 05-16-2013, 08:47 AM   #35552
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Height of the tire is the concern. 112 is what you need with the TALL MT43 so it can be farther back on the swing arm or it WILL rub the front mudflap. Width is not an issue here as this is a narrower tire.
I run 13/47 112 and have been on many of the steep stuff I ride my KTM300 on in CO at 13,000'+ and it can run out of steam with this gearing/elevation. Other than steep rocky climbs or technical single track 13/47 is pretty good all around. But if I had to fine tune it I would give 13/48 a go or the equivalent with a 14 tooth front.
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Old 05-16-2013, 08:51 AM   #35553
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Measured the MT43 on my friends trials bike yesterday (400x18).
70cm or 27.5 inches tall.
Anyone know the height of the stock tire?
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Old 05-16-2013, 10:33 AM   #35554
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Originally Posted by soupknotzee View Post
Height of the tire is the concern. 112 is what you need with the TALL MT43 so it can be farther back on the swing arm or it WILL rub the front mudflap. Width is not an issue here as this is a narrower tire.
I run 13/47 112 and have been on many of the steep stuff I ride my KTM300 on in CO at 13,000'+ and it can run out of steam with this gearing/elevation. Other than steep rocky climbs or technical single track 13/47 is pretty good all around. But if I had to fine tune it I would give 13/48 a go or the equivalent with a 14 tooth front.
What tire are you running with this gearing in this terrain? Taller tires like the D606's or mt43s or something more stock like the T63?

I'm shooting for overall gearing of 13/47 and believe the 13/49 with the mt's will achieve this.

Most of my riding will be 8,000-12,000 feet, and every couple weeks above 12k feet. Although to get to these trails running with more power at ~5-6k feet in elevation.
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Old 05-16-2013, 06:26 PM   #35555
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Originally Posted by Rapid Dog View Post
Measured the MT43 on my friends trials bike yesterday (400x18).
70cm or 27.5 inches tall.
Anyone know the height of the stock tire?
Mine measures 25.5". That is not the stock tire but it's a 120/80-18 50/50 knobby so should be in the ballpark. Not new; about 1/2 tread left.
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Old 05-16-2013, 06:57 PM   #35556
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...that's what I got too, so the MT43 is gonna be a good 1"-1 1/2" taller...hmmm...I want to here reports.
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Old 05-16-2013, 07:16 PM   #35557
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wheel spacers

does anyone have some wheel spacers laying around that they could measure for me.i just need the lengths from them I believe the fronts and the backs all have different lengths.it would be much appreciated.
cheers,
jon
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Old 05-16-2013, 07:18 PM   #35558
ramz
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More info here:

http://rickramsey.net/WR250Rmods.htm#tires

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Old 05-16-2013, 08:03 PM   #35559
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Thanks Rick, your part of th reason I'm going with these tires because I'll be riding in your back yard.

Seems like the 112 will work, thats what I'm going to go with.
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Old 05-16-2013, 10:30 PM   #35560
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If I put Pirelli MT21's on my X will I need to change the gearing?
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Old 05-17-2013, 04:13 AM   #35561
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Originally Posted by rhollamby View Post
Hey guys and gals,
To help with gearing going to a 13 49 set up and buying a 14 also. 14 for the long hauls and 13 for the mountains here in Colorado.
Buy an extra nut or 2, if you're going to do frequent swaps; the peening will take its toll.
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Old 05-17-2013, 05:19 AM   #35562
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Originally Posted by jon_l View Post
Buy an extra nut or 2, if you're going to do frequent swaps; the peening will take its toll.
Anyone know what the thread size is? Maybe the Eagle Mike KLR countershaft nut will fit?
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Old 05-17-2013, 06:18 AM   #35563
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pn 90179-18010-00

$5.64 at Service Honda
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Old 05-17-2013, 07:35 AM   #35564
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Quote:
Originally Posted by Llamaha View Post
If I put Pirelli MT21's on my X will I need to change the gearing?

...you mean on your 17's?
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Old 05-17-2013, 07:44 AM   #35565
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Originally Posted by jon_l View Post


pn 90179-18010-00

$5.64 at Service Honda
Yeah, I just bought one for my third CS sprocket change. I really do not like this method of securing the sprocket nut. First it requires that you beat on the spline with a hammer/drift, etc., which can't be good for it. Secondly, the tried-and-true dog-ear, bend over spline washer used on most bikes is cheap and never fails.

Once I removed the CS cover to find this nut just finger tight. Yamaha must've recognized this as a weak design because I noticed the plastic CS cover has a keeper that prevents it spinning off. That's the only reason I haven't gone to one of the more open, aftermarket case savers.

BTW, at the local dealer these nuts are about $8 with sales tax.

I wonder if there's a normal nut with dog-earred washer that will fit the WR-R spline that can replace this system???
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