'01 426 Gearbox issues

Max Factor

Sponsoring Member

Oct 18, 2000

155

0

• May 9, 2002

• #1

My brothers just bought a second hand 2001 YZ426 and it seems to "jump out" of 5th gear. It happens anytime after shifting into top, it jumps out of gear resonably violently, the motor instantly free revs and then it re-engages. It continues this cycle till down shifting.

Has anyone else had / heard of this problem with the 426?

It seems to me like an issue with the selector dog or pawl not holding engagement?

 

S

skthom2320

Member

Oct 11, 2001

27

0

• May 19, 2002

• #2

Do a search on www.thumpertalk.com. There have been some 4th gear problems on '01 bikes. I have 100 hours on mine and it is still fine ...


Here is a link to one of the threads:

http://www.thumpertalk.com/bike/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=6&t=003829&p=

 

SFO

LIFETIME SPONSOR

Feb 16, 2001

2,001

1

• May 19, 2002

• #3

The '02 yz-f's have different part #'s for some of the gears and the shift forks.
My wr does it too.
I will be putting the new stuff in it soon.

 

G

gonads

Member

Apr 24, 2002

1

0

• May 27, 2002

• #4

Whilst this problem occurs ocasionally, it is not a common problem.
It certainly sounds like the pawl may be bent.
I suggest a complete gearbox rebuild. Whilst rebuilding the box, perhaps you may want to utilise the rest of the bike.
May I suggest keeping the bike as spare parts for any friends you may have that ride similar models, or maybe considering a similar purchase
Gonads "Hans" Off ma KTM520

 

Max Factor

Sponsoring Member

Oct 18, 2000

155

0

• May 27, 2002

• Thread starter
• #5

It turned out to be worn / rounded dogs between gears. Needed 3, 4, 5th gear sets. One shift pawl was slightly bent and quite grooved. All new parts coming. (piston also was up for a change)

The dealer said 426 gearboxes were becoming 'suprinsingly regular'. He just re-built an '02 model that was 3 months old.