Cutting out in 5th gear only

8 replies to this topic
  • TigcraftYamaha

Posted August 18, 2005 - 06:21 PM


Hello all,
I have a 2001 YZ426 engine in a roadracing (Tigcraft) frame. It's been bored, stroked, hot cams, ported. My problem is the engine cuts out horribly in 5th. But 5th only. The cutting out seems in no way related to rpm. It cuts out instantly when I shift into fifth and will cut out no matter the rpm. It does not cut out in any other gear. I've disconnected the neutral switch and the other wires with it, I put in a new stator, checked all the wiring and connections; the carb seems fine except I have to use a 135 main jet. (I tried re-jetting from 135 to 165 but nothing helps the 5th gear problem.)

I don't see how since I diconnected the wire at the neutral switch, but could it be the CDI?

Any knowledge, insight, hunches, best guesses would be greatly appreciated.

I'm leaving for the track early Friday morning, Aug. 19, so I won't be able to respond until Monday, but thanks in advance for any help.

  • grayracer513

Posted August 18, 2005 - 09:23 PM


Trans problem:

  • Daz_426_02

Posted August 19, 2005 - 12:46 AM


Grayracer, there seems to be quite a lot of these 5th gear problems. Is this a manufacturing fault or is it simply a case of the gears being abused? My 02 426 runs fine but obviously if there is something that can be done to avoid these problems then that's better than fixing it.

Prevention is better than cure...

  • grayracer513

Posted August 19, 2005 - 07:26 AM


I think it's a mix of things. First, I don't think the gears were as hard at the locking dogs as they should have been. Beyond that, slow, lazy, imprecise shifting that allows the dogs to "grind" over each other won't help matters.

I know people with really old 426's that have never had this problem, so the rider probably has something to do with it. Shift crisply and positively. Should help the gears live longer.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • TigcraftYamaha

Posted August 19, 2005 - 07:42 AM


Thanks a lot for the reply. (I didn't make it to the track.)
I thought about a transmission problem, but if
it were that wouldn't I hear/feel grinding or something? What I hear is the engine stumbling. I'll be going down the straight (roadrace track) in 5th and the engine just
never clears up.

I had the bike on a dyno. I can rev it up in 4th and it's
smooth as silk up to 11,000, but in 5th the engine cuts-
out no matter the rpm.

Thanks again,

  • Team_Oatmeal_Pie

Posted August 19, 2005 - 04:12 PM


Thats dead on for a tranny. Mine did the same in 3rd. messed around with it until 4th went too. Take a look down stairs, see whats up

  • 02YZ426

Posted August 19, 2005 - 05:55 PM


Mine did the same thing.. In fifth it would almost be like the rev limiter would come on too early or the clutch was jumping in and out but in fact it was the tranny. It ran fine in all the other gears so I knew then it wasnt the engine. I needed to replace 3rd, 5th and the shift fork.

  • Dan_Lorenze

Posted August 20, 2005 - 11:37 AM


Happened to me twice... 5th gear cracked.. No wonder they went to a 4 speed.. :D

  • TigcraftYamaha

Posted August 21, 2005 - 10:51 AM


Thanks to everyone for the advise. I certainly wasn't
thinking seriously about it being the transmission. I'm
going to check it out.
Thanks again,

Related Content


Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies

James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies

Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On January 15, 2017
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

05 yz450f not fast enough by RedeyeYZ

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  38 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.