Greetings

This is such a great site! You guys are doing an awesome service, however, I guess it is fortunate for me (so far) that I did not stumble on this prior to buying my new 01 426 (15 Dec) or I may have kept my old YZ250! I have about 1 hour time on the bike (due to the unusually heavy winter weather we have experienced in this part of Texas the last 2 weeks) however, and performance wise it has defineitly met my high expectations! Of course, I am running into the same sooty/fouled spark plug scenario most of you mention, but man does this thing pull hard! BTW, I am at about 3000 ft elevation, and so far averaging 45-50f temps. I have the airscrew 2 1/2 turns out (with great response), raised the clip one position and dropped the main one size. My feeling from reading most of the posts in this forum (heck, I have read them all!) is that this seems more of an ignition problem that carb, but who am I to say!

My only other changes so far were swapping the stock bars for McGrath bend Renthals, getting rid of those atrocious tires (all of the tracks I ride are soft/intermediate terrain which are usually prepared well) for Michelin S-12's (that front tire has helped every bike I have ever used it on). I also plan to go to a different clamp to move the bars up (best improvement I ever made to my trusty 94 YZ).

I also followed the advice I read about greasing all bearings (the steering stem and wheel bearings were DRY!). So far very happy! There are several great tracks/riding areas in the Texas/Northern New Mexico area if anyone ever gets out here, happy to advise anyone.

How difficult is it to lube the wheel and stem bearings? Any special tools required, IE. pullers, torque wrench, etc? Did you lube the swing arm pivot also and if so how difficult was that?

Paul in AZ

I also plan to go to a different clamp to move the bars up (best improvement I ever made to my trusty 94 YZ).

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Hey Tom, I agree about the clamps. Check out these triple clamps at yamahausa.com. great adjustability, including height.

01yzac04-02-500.jpg

BILLET ALUMINUM TOP CLAMP

4-position adjustments: 6mm closer to rider, stock position, 13mm forward, and 19mm forward of stock. Durable and extremely strong. Select mounts for either standard or Pro Taper handlebars. Standard Mounts fit all 7/8-inch (stock) bar styles. ProTaper mount style fits all 1-1/8 inch oversized handlebars.

Originally posted by Paul in AZ:

How difficult is it to lube the wheel and stem bearings? Any special tools required, IE. pullers, torque wrench, etc? Did you lube the swing arm pivot also and if so how difficult was that?

Paul in AZ

Paul: Sorry, I screwed up my first reply attempt! Anyway, the steering stem lube was easy, I just took off the front wheel , then started disassembling everything from the top down (try to not turn your front brake reservoir upside down, otherwise you will have to bleed the brakes). After I took off the top clamp and the assembly nut underneath it, I had my wife hold the fork legs (5 years ago she didn't know a moped from a Harley, now all the parts guys in town know her by voice!) slid the stem down, greased it up and re-installed. As far as the wheel bearings, I got this little syringe type thing at Auto-Zone which allowed me to shoot grease past the seals without damaging them.

Thanks for the lube training!!!

Paul in AZ

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