Annoying problem with my YZ, help

R

Ryan314

Member

Feb 4, 2007

145

0

• Apr 13, 2007

• #1

Is it normal for the bike to jerk forward a little bit when you shift into first gear? My '97 YZ 125 does this and sometimes it stalls out on me if I don't give it any gas while shifting into first gear... It also makes a "clack" sound when I shift into first. I also noticed that when I do shift into first gear, the idle speed changes (idles lower then when in neutral). I just changed my tranny fluid and I was hoping maybe that would help, but it still does the same thing.

Is this normal? If not, what needs to be done to fix this? I can't possibly see how this can be normal... if you're holding in the clutch and you shift into any gear, it should not jerk whatsoever.... maybe I'm wrong.

Help!

 

M

mandark1967

Member

Mar 12, 2007

246

0

• Apr 13, 2007

• #2

Sounds like you have a clutch issue.

I'd buy the following:

Clymer Manual for your bike
Clutch plate kit (around $80-$100)
New clutch cover gasket (around $15)
New clutch springs and screws (around $20)
New Clutch Cable (around $14)
New clutch bearings (around $20)

When you pull your clutch apart to replace the plates, take a good hard look at your clutch basket and boss clutch. There will very likely be ridges worn into them given the age of your bike.

Place the basket in a vice (wrapped in a towel or something to prevent damaging it) and use a flat file to file down the ridges if they aren't too big. If the ridges are too deep, you'll need a new basket and boss clutch.

Make sure you follow the directions in the clymer manual when rebuilding the clutch and you'll be back up in no time.

 

R

Ryan314

Member

Feb 4, 2007

145

0

• Apr 13, 2007

• Thread starter
• #3

Ok well I have a Clymer manual, and I see that it requires a special tool to remove the clutch basket... is this neccassary? What else could I use to remove it?

 

M

mandark1967

Member

Mar 12, 2007

246

0

• Apr 13, 2007

• #4

Ryan314 said:

Ok well I have a Clymer manual, and I see that it requires a special tool to remove the clutch basket... is this neccassary? What else could I use to remove it?

Click to expand...

I just did all that stuff last weekend. You "can" use a clutch holder, or you can make one with a piece of 2"x2" wood and a couple drill bits and sockets.

Measure the length of wood and cut it and then measure how far apart the screw mounts are apart and drill a bit of the wood out and insert a socket so they fit around the clutch spring screw mounts.

 

C

Chili

Lifetime Sponsor - Photog Moderator

Apr 9, 2002

8,062

17

• Apr 13, 2007

• #5

mandark1967 said:

Sounds like you have a clutch issue.

I'd buy the following:

Clymer Manual for your bike
Clutch plate kit (around $80-$100)
New clutch cover gasket (around $15)
New clutch springs and screws (around $20)
New Clutch Cable (around $14)
New clutch bearings (around $20)

When you pull your clutch apart to replace the plates, take a good hard look at your clutch basket and boss clutch. There will very likely be ridges worn into them given the age of your bike.

Place the basket in a vice (wrapped in a towel or something to prevent damaging it) and use a flat file to file down the ridges if they aren't too big. If the ridges are too deep, you'll need a new basket and boss clutch.

Make sure you follow the directions in the clymer manual when rebuilding the clutch and you'll be back up in no time.

Click to expand...

Nice except I'd try adjusting the clutch cable first. As far as a clutch holder you don't need one if you have an impact gun to take it apart, or you can jam a rag between the basket and the case and use a breaker bar to loosen the nut. There is obviously some risk of damage if you use the rag/breaker bar approach and go too far.

 

R

Ryan314

Member

Feb 4, 2007

145

0

• Apr 14, 2007

• Thread starter
• #6

mandark1967 said:

Sounds like you have a clutch issue.

I'd buy the following:

Clymer Manual for your bike
Clutch plate kit (around $80-$100)
New clutch cover gasket (around $15)
New clutch springs and screws (around $20)
New Clutch Cable (around $14)
New clutch bearings (around $20)

When you pull your clutch apart to replace the plates, take a good hard look at your clutch basket and boss clutch. There will very likely be ridges worn into them given the age of your bike.

Place the basket in a vice (wrapped in a towel or something to prevent damaging it) and use a flat file to file down the ridges if they aren't too big. If the ridges are too deep, you'll need a new basket and boss clutch.

Make sure you follow the directions in the clymer manual when rebuilding the clutch and you'll be back up in no time.

Click to expand...

Well I took a look at my clutch basket/clutch boss today and they both looked perfectly fine... no signs of wear whatsoever... they almost looked brand new!

So, what else could it be?

 

Z

ZoomByU

Member

Mar 28, 2007

11

0

• Apr 14, 2007

• #7

Chili said:

Nice except I'd try adjusting the clutch cable first.

Click to expand...

Try this

 

C

Chili

Lifetime Sponsor - Photog Moderator

Apr 9, 2002

8,062

17

• Apr 14, 2007

• #8

There are several reasons a clutch will get jumpy like that, the most common are as follows, if there is not enough freeplay in the cable. You should have about a nickel width or slightly more play between the lever and the perch. Next I'd check the basket and hub, in checking those I'll assume you removed all the plates from the clutch? If not you will not see the notching on the basket and hub. And sometimes it's just time for new plates and springs.

 

B

butters

Member

Mar 9, 2007

22

0

• Apr 14, 2007

• #9

or the main reason may be because the gear lube is still cold and when you put it into first gear the friction of the cold lube slows the motor down.... what viscocity lube you run?

every bike i got is like that, till it warms up.



the plates "stick" together after it sits and cools down.

 

whenfoxforks-ruled

Old MX Racer

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Oct 19, 2006

8,129

2

Merrillville,Indiana

• Apr 14, 2007

• #10

If the plates are warped it will cause the clutch to not fully disengage.Using crappy trans fluid will do this also.

 

F

friar tuck

Member

Feb 9, 2006

190

0

• Apr 14, 2007

• #11

(whew) I thought I was the only person with a bike that did for a minute there. :-D

 

R

Ryan314

Member

Feb 4, 2007

145

0

• Apr 15, 2007

• Thread starter
• #12

Thanks for all the help... Next time I'll let it warm up longer... and I'm using Yamalube 10w-30w