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2008 125 hard shifting

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hey guys, i got to ride my new 125 last weekend and had a blast! only problem is, its hard to shift. the gear box seems notchy. Like when I pull the shifter up to change gears, i pull it all the way up (like your supposed to) but sometimes it refuses to go to the next gear. down shifting is fine. just up shifting.I've tried using the clutch to down shift and up shift. and just downshift. however it seems when i'm WFO and dont use the clutch to up shift it works a little better but still misses gears often. i tried moving the shifter and that had no effect. I'm thinking that maybe the trans could have some wear because of how hard the bike was ridden at Loretta's and mini O's by the PO. The bike has exactly 52 hours on it total, so would that be a concern? I guess the main reason that i'm so worried about it is because im riding a track tomorrow that is nothing but 100 foot triple after 100 foot triple and don't want to have a transmission failure 30 feet in the air.

Edited by lilcane88

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I thought you were supposed to use the clutch when UPSHIFTING:bonk:? This is when there is a load on the tranny. You can skip the clutch part on downshifting without worry. I am almost positive this is what Gary Semics explained in the MX Racing forum here.

This may not be the solution to your problem but it might be the cause??? How long have you had the bike?

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I thought you were supposed to use the clutch when UPSHIFTING:bonk:? This is when there is a load on the tranny. You can skip the clutch part on downshifting without worry. I am almost positive this is what Gary Semics explained in the MX Racing forum here.

This may not be the solution to your problem but it might be the cause??? How long have you had the bike?

i've tried using the clutch when upshifting too with no luck. and i've put 40 minutes on the bike. noticed the problem since minute 1. with all of the other bikes ive owned i've always used the clutch to up and down shift. got this one and started out using the clutch for both with no luck so i started just using it when down shifting and it seemed to work better that way.

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Hmmm...my bike was bought used as well and had been ridden at Loretta's too by the PO. It had 54 hours on it when I bought it. However, they changed the clutch plates right before selling it to me and I don't experience your problem. I hate to say it, but, you need to check out your clutch or just go ahead and get the rebuild kit and do it. The good news is that it's not too expensive and not too hard to do. The bad news is...be careful when you ride until it is done. I don't think you will do any damage to the tranny by riding it but you might crash and hurt yourself.

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Hmmm...my bike was bought used as well and had been ridden at Loretta's too by the PO. It had 54 hours on it when I bought it. However, they changed the clutch plates right before selling it to me and I don't experience your problem. I hate to say it, but, you need to check out your clutch or just go ahead and get the rebuild kit and do it. The good news is that it's not too expensive and not too hard to do. The bad news is...be careful when you ride until it is done. I don't think you will do any damage to the tranny by riding it but you might crash and hurt yourself.

I agree that the clutch plate replacement job isn't very hard to do. One thing that is very helpful when replacing the clutch plates, or basket either one, is to purchase one of those Motion Pro clutch/flywheel holders to prevent the clutch hub from spinning when loosening/tightening the fasteners. They work really well and make the process go a little smoother.

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so you guys think its the plates? hmm. okay. i could see that. I guess i kinda jumped to conclusions and assumed it was something more major. but then again, the clutch feels fine. it works smoothly. what i'm feeling is in the shifter. very very notchy and sometimes hard to find neutral.

and thanks guys for the response. i'm only 14 but i work on bikes for myself and other people. next year my local shop said they would hire me to do an apprenticeship program and all. I guess i've been lucky though. this is my 6th motocross bike that has been ridden hard and my first transmission problem other than replacing clutch plates for peace of mind. I must be doing something right? :thumbsup:

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Hmmm...my bike was bought used as well and had been ridden at Loretta's too by the PO. It had 54 hours on it when I bought it. However, they changed the clutch plates right before selling it to me and I don't experience your problem. I hate to say it, but, you need to check out your clutch or just go ahead and get the rebuild kit and do it. The good news is that it's not too expensive and not too hard to do. The bad news is...be careful when you ride until it is done. I don't think you will do any damage to the tranny by riding it but you might crash and hurt yourself.

sweet man. who's bike was it? mine was Seth Caldwell's. he won the schoolboy class on it on 08. I don't mind replacing clutch plates at all. very simple job. i just fear something more serious. i guess i'm kind of paranoid haha

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Mine was raced in Aug. 2007 by Mitchell Hough...didn't win his class by the way. The bike was built by ProCircuit.

Back to you, though....so you are feeling like the problem is in the lever you shift with your foot? Have you checked to make sure the shifter is tight on the spindle and that the splines are all still in tact? If that is all ok, yeah, I just think you need to change out the plates and check the basket and shift forks. Your bike has really strong reliability in all areas except the plates, which are wear and tear anyway.

:thumbsup:

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This is not to imply you haven't changed your oil, but YZs shift poorly when their gearbox oil gets old/dirty.

Just saying "try the easy fix first". :thumbsup:

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This is not to imply you haven't changed your oil, but YZs shift poorly when their gearbox oil gets old/dirty.

Just saying "try the easy fix first". :thumbsup:

Duh...that's so true! So simple i didn't even think of it. I bet the oil is cooked from racing. Definetely, change the oil, ride it hard for 30 minutes and then change it again. Let us know what you find.

-good call capt

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This is not to imply you haven't changed your oil, but YZs shift poorly when their gearbox oil gets old/dirty.

Just saying "try the easy fix first". :thumbsup:

That's been my experience as well. My YZ250 definitely shifts a lot easier and smoother right after an oil change. I usually change the oil in both my YZ125 and YZ250 after three rides max.

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the oil isn't any older than 45 minutes of ride time, but i'll definitely change it before I ride today. will post back this evening with results.

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the oil isn't any older than 45 minutes of ride time, but i'll definitely change it before I ride today. will post back this evening with results.

If your transmission oil only had 45 minutes of actual ride time on it, then that wouldn't be the problem.

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If your transmission oil only had 45 minutes of actual ride time on it, then that wouldn't be the problem.

if he really did change all of the fluids before i came to pick it up, then yes it has 45 minutes of ride time on it. if he "forgot" to change the transmission oil, there could be numerous hours on it.

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I would pull the clutch plates and check to see if they are with-in spec. While your there pull the clutch basket out, use a flash light and check the condition of your shift stopper. I know the shift stopper was a problem with the '06 and '07 but, I'm unsure about the '08. It couldn't hurt to have a look though.

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changed the oil.. its seemed pretty dirty. put fresh in and the bike shifted like a dream. its amazing how big of a difference fresh oil makes on this bike.

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Don't forget to change it again asap so all the crap that might be in there is out. This is necessary because of how hard it was run by the PO...unless u ride it like he did, you won't have to do the double oil change again. I think you should go ahead and change the brake fluid out as well, just for good measure:thumbsup:

Glad to see it is shifting as it should.

BTW: don't worry about the shift stopper, it was only on the 2005 & 2006 years that had a potential problem.

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thanks Doug. will do. I still can't believe the most simple thing slipped my mind. I guess i'm used to 4-pokes where every little problem you can expect to break out the big bucks :thumbsup:

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Speaking of hard or "notchy" shifting issues with a YZ125, check out the comparison pictures below of the shift stopper that I removed from my '05 model today and a brand new '07 model shift stopper part. I think that this would explain the shifting issues that I have noticed as of late.

2005YZ125shiftstoppercomparison-1.jpg

2005YZ125shiftstoppercomparison-2.jpg

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