Yz 125 Issues

nadeauracing229
Edited Date/Time 1/25/2012 11:12pm
Well a while back we traded our 03 rm 250 for an 03 yz 125 (and cash) Took it out and rode it ran and rode great then went to the track one day and on the face of a jump it acted like it was in neutral couldn't shift out of it or anything so we took it home split the cases transmission was fine so we figured it was the clutch replaced pretty much everything in the clutch and now it just slips what could be the problem?
|
MX558
Profile picture for user MX558
Posts
1770
Joined
4/1/2008
Location
US
MX558 1/24/2011 2:08pm
1/24/2011 2:08pm
I heard they have an issue with the shift return spring or something like that, not a hard fix.
MX_Andrew83
Profile picture for user MX_Andrew83
Posts
747
Joined
10/6/2010
Location
Morehead city, NC US
MX_Andrew83 1/24/2011 2:08pm
1/24/2011 2:08pm
There is a shifting fork in their that is known for braking, hasn't happened on mine, but I have heard of it happening to others.
PC
Profile picture for user PC
Posts
466
Joined
8/24/2009
Location
GU US
PC 1/24/2011 2:08pm
1/24/2011 2:08pm Edited Date/Time 1/24/2011 2:09pm
I know the 05' and 06 motors had weak bearings for the shift stopper and the fix was to update to the 2007 updated part. Not sure if the pre-05 motors have this issue too, but its very possible.



Just gotta pull the side cover off. No case splitting required, so should be easy to diagnose if this is the issue



http://www.thumpertalk.com/...hlight=yz125+stopper
nadeauracing229 1/24/2011 3:19pm
1/24/2011 3:19pm Edited Date/Time 1/24/2011 3:20pm
Would that cause it to slip? Would the 07 part work? Thanks alot guys!!!

The Shop

See All »
JW381
Profile picture for user JW381
Posts
10642
Joined
7/21/2009
Location
Harrisburg, OR US
JW381 1/24/2011 3:22pm
1/24/2011 3:22pm
Off topic, but I'm fully surprised to find honest answers to your question. I expected nothing but sarcasm lol

Sorry I don't have anything more to contribute than that..
crf250pilot
Profile picture for user crf250pilot
Posts
2080
Joined
4/1/2008
Location
Manning, OR US
crf250pilot 1/24/2011 3:29pm
1/24/2011 3:29pm
MX_Andrew83 wrote:
There is a shifting fork in their that is known for braking, hasn't happened on mine, but I have heard of it happening to others.
Yes, both my 05 and 06 yz125's had a bearing type shift stop, make sure yours is a solid wheel type and replace if it has the bearings with an 07 part. I've seen the bearings ground down to almost nothing at all. Here is good P/N 1c3-18140-10
ky_savage
Profile picture for user ky_savage
Posts
2475
Joined
12/4/2008
Location
Kentucky, KY US
Fantasy
490th
ky_savage 1/24/2011 3:31pm
1/24/2011 3:31pm
JW381 wrote:
Off topic, but I'm fully surprised to find honest answers to your question. I expected nothing but sarcasm lol Sorry I don't have anything more to...
Off topic, but I'm fully surprised to find honest answers to your question. I expected nothing but sarcasm lol

Sorry I don't have anything more to contribute than that..
I think one of the things you were looking for was.......... All that and only one period at the end! Longest sentence ever! Sorry Wink
Ds164
Profile picture for user Ds164
Posts
208
Joined
12/22/2009
Location
Lyman, ME US
Ds164 1/24/2011 3:31pm
1/24/2011 3:31pm
Definitely a common problem. I had 2 of those bikes and was constantly dealing with it.
MX7MX
Profile picture for user MX7MX
Posts
845
Joined
8/28/2007
Location
AL US
MX7MX 1/24/2011 3:38pm
1/24/2011 3:38pm
Ds164 wrote:
Definitely a common problem. I had 2 of those bikes and was constantly dealing with it.
I thought 4 strokes were the unreliable bikes?
SlowOldGuy 1/24/2011 3:49pm
1/24/2011 3:49pm
Ds164 wrote:
Definitely a common problem. I had 2 of those bikes and was constantly dealing with it.
MX7MX wrote:
I thought 4 strokes were the unreliable bikes?
It's an 03. How many 03 4 strokes do you know that still even run?
nadeauracing229 1/24/2011 4:10pm
1/24/2011 4:10pm
That is for the transmission this is a slipping clutch problem and the parts are not the same from the years how could that do it?
Trent179
Profile picture for user Trent179
Posts
1227
Joined
4/3/2010
Location
Princeton, IN US
Trent179 1/24/2011 4:29pm
1/24/2011 4:29pm
What kind of clutch did you put in? Have you ever put plates in before?
Trent179
Profile picture for user Trent179
Posts
1227
Joined
4/3/2010
Location
Princeton, IN US
Trent179 1/24/2011 4:32pm
1/24/2011 4:32pm
You do have some play in the clutch lever right? May sound dumb but I have seen people do this before after putting a clutch in.
nadeauracing229 1/24/2011 4:35pm
1/24/2011 4:35pm
Trent179 wrote:
You do have some play in the clutch lever right? May sound dumb but I have seen people do this before after putting a clutch in.
Yes its really a mystery to us why its like this
Wadded_Up 1/24/2011 5:43pm
1/24/2011 5:43pm
We had an 03 and a 05 and they were the most reliable bikes we ever ran.......

Pit Row

See All »
wet paint
Profile picture for user wet paint
Posts
404
Joined
7/15/2008
Location
Chesnee, SC US
wet paint 1/24/2011 7:11pm
1/24/2011 7:11pm
I could go through a 15 min. write up on the problem but the best thing to do is just add another fiber disc to what you have now. One of the old ones will work fine. If this is the problem it will get you buy for a few months. Save your money and buy a new basket and pressure plate down the road and you should be ok .
toolie
Profile picture for user toolie
Posts
116
Joined
12/28/2008
Location
Simi Valley, CA US
toolie 1/24/2011 10:08pm
1/24/2011 10:08pm
nadeauracing229 wrote:
We cant get the clutch figured out otherwise its awesome
Did you replace the pressure plate and the clutch hub.
And if so was it the right year. It sounds like they are not collapsing tight on to the plates.
Like the pressure plate is worn out.
nadeauracing229 1/24/2011 10:12pm
1/24/2011 10:12pm
nadeauracing229 wrote:
We cant get the clutch figured out otherwise its awesome
toolie wrote:
Did you replace the pressure plate and the clutch hub. And if so was it the right year. It sounds like they are not collapsing tight...
Did you replace the pressure plate and the clutch hub.
And if so was it the right year. It sounds like they are not collapsing tight on to the plates.
Like the pressure plate is worn out.
I guess we will try that how can a pressure plate even go bad? The new one we changed on our last kx looked the same as the old one and made no difference
toolie
Profile picture for user toolie
Posts
116
Joined
12/28/2008
Location
Simi Valley, CA US
toolie 1/24/2011 10:20pm
1/24/2011 10:20pm
nadeauracing229 wrote:
We cant get the clutch figured out otherwise its awesome
toolie wrote:
Did you replace the pressure plate and the clutch hub. And if so was it the right year. It sounds like they are not collapsing tight...
Did you replace the pressure plate and the clutch hub.
And if so was it the right year. It sounds like they are not collapsing tight on to the plates.
Like the pressure plate is worn out.
nadeauracing229 wrote:
I guess we will try that how can a pressure plate even go bad? The new one we changed on our last kx looked the same...
I guess we will try that how can a pressure plate even go bad? The new one we changed on our last kx looked the same as the old one and made no difference
They do wear out if the outer clutch plate picks up some debris and it starts eating up the pressure plate same with the hub, Usually it will be discolored or grooved.
And do change the shift stop roller the other people are talking about , I have repaired two my self. P/N 1c3-18140-10
Dirtysmile56 1/24/2011 10:21pm
1/24/2011 10:21pm
Ds164 wrote:
Definitely a common problem. I had 2 of those bikes and was constantly dealing with it.
MX7MX wrote:
I thought 4 strokes were the unreliable bikes?
SlowOldGuy wrote:
It's an 03. How many 03 4 strokes do you know that still even run?
LMFAO Smile

You do have a point there Smile

However my 03 TTr 125 is still running but very tired and not worth rebuilding. Typical four stroke predicament.
Dirtysmile56 1/24/2011 10:25pm
1/24/2011 10:25pm
Babba Boey on here had his bearing in the shift fork fall apart and down into the tranny and nuke the entire thing, Yamaha forgot to put out a bulletin on this very simple fix. Don't hesitate if that is what the problem is. BTW is your clutch basket in decent shape?

Sometimes if you put a little sawdust in there it will tighten things up. Smile
toolie
Profile picture for user toolie
Posts
116
Joined
12/28/2008
Location
Simi Valley, CA US
toolie 1/24/2011 10:34pm
1/24/2011 10:34pm Edited Date/Time 1/24/2011 10:41pm
nadeauracing229 wrote:
Will the 07 part work in the 03?
not sure
silver753
Profile picture for user silver753
Posts
137
Joined
5/18/2010
Location
Brick, NJ US
silver753 1/24/2011 10:39pm
1/24/2011 10:39pm
On some YZ125 the clutch pressure plate has to be "indexed". That means, the pressure plate aligns with all 5 clutch spring towers, but only fits all the way down on ONE OF THEM. Take the springs out and keep rotating the pressure plate until it fits all the way down on the first fiber plate. If you have it on the correct one, it will make all the difference. Also, make sure to measure the thickness of the pressure plate, if it's worn, you will install a new clutch and it will still slip.
toolie
Profile picture for user toolie
Posts
116
Joined
12/28/2008
Location
Simi Valley, CA US
toolie 1/24/2011 10:41pm
1/24/2011 10:41pm
nadeauracing229 wrote:
Will the 07 part work in the 03?
Scratch that I just looked it up they look totally different. Sorry.
moto138
Profile picture for user moto138
Posts
138
Joined
3/30/2010
Location
Somewhere In Time, OR US
moto138 1/25/2011 12:57pm
1/25/2011 12:57pm
silver753 wrote:
On some YZ125 the clutch pressure plate has to be "indexed". That means, the pressure plate aligns with all 5 clutch spring towers, but only fits...
On some YZ125 the clutch pressure plate has to be "indexed". That means, the pressure plate aligns with all 5 clutch spring towers, but only fits all the way down on ONE OF THEM. Take the springs out and keep rotating the pressure plate until it fits all the way down on the first fiber plate. If you have it on the correct one, it will make all the difference. Also, make sure to measure the thickness of the pressure plate, if it's worn, you will install a new clutch and it will still slip.
i do believe this gentleman has the answer,i ran into this same problem a few years back. this will definitely create the problem you are having with clutch slippage.

Post a reply to: Yz 125 Issues