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woods426

O1 Tranny Issues?

12 posts in this topic

Got a question that hopefully one of the experts around here can help me with.

I just picked up a 01 YZ 426 that was pretty much beat, but I only payed 1000 for it, so I knew the thing was going to be more or less a project bike. Ive found many things wrong with the bike, but the problem I'm working on right now has to do with fifth gear, its just like another neutral, no griding lurching or anything, just pretty much nothing when shifted into fifth. The kid I bought it from says its been that way shortly after he bought it, a likely story if I've ever heard one :cry:

Anyways, I've got the bike torn down, the cases apart, and whats most puzzling to me is I can find nothing visually wrong with any of the parts and I can twist the shift drum by hand and the thing seems to shift into fifth and engage just fine?? Any ideas of what to replace first?

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Is this a hard project? 4th gear is going out in my bike and it will be about $800 for a shop to fix it!! Is this something I can do at home in my garage with regular tools?

Ed

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Asking for some more advice here please. I replaced the shift fork that actuates fifth gear because it did have sustantial wear marks on one side of it. I bench tested it ratcheting through all the gears numerous times and it seemd like fifth was engaging fine. BUT after buttoning up the whole bike and running it I still have no fifth gear. The symptoms are the same as before just a big nothing when shifting into fifth, its like theres an neutral at the top instead of a gear.

I assume the problem must also be one of the gears or multiple sets of them, which ones do I need to replace?? Help!! :cry:

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I assume the problem must also be one of the gears or multiple sets of them, which ones do I need to replace?? Help!! :cry:

Did you check the dogs? A common problem is worn dogs on the fourth-to-fifth connection on the main shaft. Even if it mocks up right it may be slipping under power.

Check the dogs on both the fourth and fifth wheels on the main shaft...

If the old fork was worn that implies that the gear it works on has a lot of wear also...

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My buddy had the same problem with his 426. His problem with 5th was he was riding it on the pavment. He was racing a couple of street bikes. The tourqe from power shifting did it. He took his to the shop and it was only about a hundred bucks to get it fixed. I am not shure what was the problem but I think the gear was striped or it was the shifting fork. He happend shortly after he got it also.

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my '02 4th gear was slipping. Took it to the shop and had to replace 5 gears and 1 shift fork. Ran me about $600.00.

Ed

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My bike has been going strong since it was new, and today it looks even better than the 2005's.... I'll post some pics to prove it tomorrow.... My latest upgrade were some Pro-Taper donuts, work great and very comfortable..

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my '02 4th gear was slipping. Took it to the shop and had to replace 5 gears and 1 shift fork. Ran me about $600.00.

when i stripped my 4th gear it cost maybe $200.

when i bent a shift fork and blew 3rd gear, it cost $150.

when i was a newbie, i broke my CB gear, took it to the shop and it cost over $1000. screw those guys at the shop, they could even route the wires correctly. :cry:

it just isnt worth taking it to a so-called "shop". :cry:

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I would check the shift shaft mechanism (scissors) and the pawls at the end of the shift drum. I would suspect that the tips of the scissors are worn and will not rotate the drum with the shift lever , but when you rotate the drum on the bench by hand it travels fully into position.

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Just a quick follow-up. On the advice in some PM's from Grayracer513 I ordered up a new third gear pinion, along with a WR fifth gear set. Since this bike will see zero track use, I thought this would work well in the woods and allow me to lower the overall gearing, but not lose to much top speed.

Did it work? Yep, I finally have a fifth gear, thank god. It seems geared just about right with 13/51 overall gearing, first is plenty low and the WR fifth is more then high enough for good fireroad speed without screaming the guts out of the bike for long periods of time.

So anyways, just wanna extend a big thanks to Grayracer and everybody else for thier two cents.

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