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Possible explanation/fix for the some of YZ426 clutch problems.

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#1
I put up a web page with my experience of the YZ 426 clutch problem. I hope you find the information of use. I will be on vacation at the San Raphael Swell until Tuesday and will check back to see what others have to say about this information then. The pics take a little time to load. Enjoy! http://www.motox.org/yz426  

Richard<p align=right>04-13-2000 :Edited
 

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#2
Thanks for the information Richard. I have not experienced the problems thus far on my less that 20hours 426. Do you have a number for Yamaha support to get more information about how to grind the end of the pushrod? You may have found the source of the problem and not just fixed the symptom.
 
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CHIP

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#3
Very informative info Richard. I have been having a little trouble with my clutch. I was hoping that a good mechanic could help me alleviate some of my misery. It does not in any way form or fasion have a smooth release. I have adjusted it over and over. I am actually going to talk to MXTuner this weekend in person to try and see if I am doing something wrong and to see if he can show me the error of my ways. Maybe there is a connection with the problems you are having. The action the rest of the time is fine(ie: when the bike is in motion). I tried to find a number for Yamaha other than there hotline to order brochures and could not, I caught wind of a possible recall on the clutch assembly from a DRN post. My shop said that there wasn't recall but that I would probably know before they would.

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Chip
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If It's Too Loud, You're Too Old!!!
__________________________________________________
00 YZ426F (mine, all mine!!)
00 XR70R (my son's)

<p align=right>04-13-2000 :Edited
 
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#4
Got back from the Swell. Grinding it down did not fix the problem. But one thing I did not try was switching to Yamaha R 4stroke oil .I will let you know if there is any more info.<p align=right>04-18-2000 :Edited
 
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#5
Richard,

&nbsp;&nbsp;&nbsp;&nbsp; I would be very interested in what happens from here on out with your pushrod problem.&nbsp;&nbsp;I experienced the same growling/dry plates symptoms.&nbsp;&nbsp;In the beginning my clutch would even screech when coming out of a tight corner with a short approach to a jump.&nbsp;&nbsp;I disassembled my clutch and found that my friction plates were essentially dry and my metal plates were brown (burnt).&nbsp;&nbsp;Also, I found metal shavings and scoring on the big end of the pushrod.&nbsp;&nbsp;I took your post and my parts to my dealer last night and they are going to contact Yamaha on Monday, 4/24/00.&nbsp;&nbsp;I have also asked them to look into the problem with the pin in the linkage that is mentioned in other posts on this site.&nbsp;&nbsp;Any further info would be appreciated and I will share anything that I find out as well.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Stacey A. Weston
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; District 14&15 30+A Motocross
 
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#6
I am taking the bike in on Tuesday. They will take another look at it. I will let you know of any new details. The oil change to Yam-R did not seem to help and shaving the part down did not seem to make a change either.
 
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#7
I want to reflect on my 426 problem. It does seem to me that the clutch is defiantly not getting enough oil. After looking at Hinsons literature, one of the features the mention is better oil flow. This could be the reason why the Hinson clutch basket resolves the problem on my friends bike. I am going to try to get Yamaha to fix this problem first, I am finding more people are having this problem locally. I have been asking around to see if others with 426 have this problem. Some are already out of warr so they just accept it. I am finding that more vets and older guys who are not as hard on the clutch buy these things and not as many of the young clutch abusers. This is only an observation but may explain why some don't report it or don't ride the bike long enough during the warr period to figure it out. I may have to buy a new clutch basket but that would put a big negative mark on Yamaha reliability in my book they should buy it. I will just have to see if they take care of the problem. I am curious as to why everyone does not see the problem. Some people on the DRN said they have not seen it and it makes me wonder what is different about their bikes. I bought some Mobil1 to test but have not put it in yet. Another person on DRN states it causes the clutch to slip on a 400. I would welcome more lubrication I would think in my situation so I may try this if Yamaha has no fix.
 

J.B.426

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#8
I have experienced this clutch problem as well. I took the whole clutch apart and found that everthing looked new, except for very minor scratches on the cover side of the pressure plate. I couldn't find any corresponding scratches on the clutch cover either. At the time I took it apart, I had been running Yamalube 4. Since then I have switched to Mobil 1 15w50 and I have not noticed a difference, for better or worse, with the clutch. I do know that if I warm the bike up real well, I get very little if any chattering. I haven't had much, if any, of the grabbiness that I've heard other people have. My bike is long out of warranty, I got it in December, and since the clutch looked pretty much new when I pulled it out, I have been trying to warm it up good and trying not to worry about it. It's funny, I didn't start hearing the chattering sound until the bike was about 2 months old. I'll just take it day by day. Tuner had posted a while back that he heard that Yamaha was recalling the clutch, but I haven't heard anything else about it. Please keep us informed of your findings.
 

penguin

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#9
Anybody remember the 98 YZ400 kickstart levers breaking on the early production bike? because a relief hole was drilled to deep, weakening the part?&nbsp;&nbsp;Sometimes production tolerances on the assembly line can get pretty out of spec before somebody figures out what is happening.&nbsp;&nbsp;It could be one of Yamahas parts suppliers is providing poorly machined or out of spec components and the guys on the assembly line don't know any better and just slap the bike together, and then out in the real world, you and I find out the hard way and then Yamaha catches hell.&nbsp;&nbsp;It has happened before and it will happen again.&nbsp;&nbsp;Thank God for forums like this, that can get the word out , and save someone from a bad experience with an otherwise fine machine.
 
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#10
&nbsp;&nbsp; I too am having clutch problems.
&nbsp;&nbsp; Some of my symptoms were: engine knocking, clutch grabbing and slipping.
I took it to Houston Yamaha and they said the clutch housing was broken. They are getting in touch with Yamaha to see if there is a recall. They have heard of MANY problems with the 426 clutch. I have a couple friends who are experiencing the same symptoms.
&nbsp;&nbsp; I will let you all know what I find out as soon as I hear from them.
If anyone hears anything definitve, could you please e-mail me.
&nbsp;&nbsp;
 
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#11
&nbsp;&nbsp;Today I road for the first time with the Mobil 1. It made a world of difference in my clutch. It wasn't near as grabby as it had been. After it had warmed up it acted like a totally different clutch. I also noticed less noise than before. I still need to fine tune the clutch lever adjuster but thankfully Yamaha put the quick adjust on the YZ426. It makes it a whole lot easier.


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Chip
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If It's Too Loud, You're Too Old!!!
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00 YZ426F (mine, all mine!!)
00 XR70R (my son's)
 
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#12
Update:

The "possible fix" did not work as I posted before. I changed the oil to Yamalube R which seemed to help but did not resolve the problem satisfactorily. My bike was quickly running out of Warr. The next step was to grind the shaft down some more and deepen the spiral grooves which they did but since Ron at Rocky Mountain Cycle (the mechanic in the picture)  had already taken the clutch apart I had him put in the Hinson clutch basket. I rode my bike for a couple hours at the track tonight with no sign of the problem. If someone out there has the problem and does not want to put in a clutch basket like I did then I would say you should grind on the shaft. Worse case you have to buy a new one. Hinson basket is $250 or less with mail order. I would also tell anyone who has this problem to run Yamalube R through a couple oil changes. If it doesn't help try mobile 1. It may help or hinder the problem, I don't know. Since I have had problems I am going to be a sucker and only use Yamalube R. With my discount it is within a dollar of Mobile one. I did talk to a guy at the track today that did not have the problem on his 426. He has only used Yamalube R. My conclusion. His push rod was closer to tolerance thus the clutch got more oil. Yamalube R does fix the problem and I just didn't run it long enough. It could be a weight thing. I am almost 100 lbs heavier than the other guy. The president of our MX association is as thin as a rake and has the problem as well on his 426 but weight would seem to only exacerbate the problem. Hope this helps others out there but it seems for those having the problem the Hinson basket is the only way to go. Pretty crappy on Yamahas part, they got to know this is a problem. Maybe someone will start collecting serial numbers and hand them to a lawyer to start a class action law suit. As much as I hate lawyers and law suits some times it is the only way to make a manufacture live up to a Warr. I hope Honda produces a 4 stroke. If it proves to be solid I will have my name on the waiting list (for the second year model only)Update:

<p align=right>04-28-2000 :Edited
 

Tony Williams

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#13
A local San Diego guy's new 426 has the infamous clutch problem. He claims that he has a Hinson clutch basket on order, and that there is a multi-week back order.

I was in North County Yamaha today, and they have the Hinson basket in stock. :


760-432-9501

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Tony Williams, San Diego, YZ400F
 
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#14
This is weird. I've never experienced this "problem" on any 426 I've ever ridden. I understand your frustration with your problem but you seem to think this is something that affects all the 426s. And then you start making class action law suit noises......whatever.

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#15
&nbsp;&nbsp;I find this situation weird also, because I haven't had this problem on my 426, and I've abused the clutch as if were a two stroke. The dealer I bought it from says they've has no such problems on any of the many 426's they've sold. After trying different oils, I've settled on Castrol Syntec (synthetic blend), which I can buy at the local auto parts store for 2.50 a quart. However, thinking that the problem is related to oil choice is just grasping at straws. Yamaha goofed somewhere, so some of the 426 clutches have problems and some don't. I'm sure Yamaha knows what the problem is, but won't admit to it because they would have angry customers demanding a free fix.
&nbsp;&nbsp;Although my clutch works smoothly, I don't expect to get more than a year out of the plates (the clutch on my CR250 went 2 1/2 years).
 
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