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1/6/2018
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CA
I have a 2018 yz125 with about 20 hours. Roasted my clutch first moto today, it was on its way out either way. I installed new fibers and on the last lap of my final moto the lever locked up. Clutch was slipping and cable was adjusted all the way out but I would not pull the lever into the bars. Bike would still move forward but the lever was rock hard.
I run rotella t4 and have on many bikes so I don't believe this is the problem. I abuse the clutch slightly as I am a pretty quick rider but have never roasted one in three motos. Any idea if oil or something may be an issue? I have never encountered a locked up lever from a burnt out clutch and hope it isnt a bigger issue.
I run rotella t4 and have on many bikes so I don't believe this is the problem. I abuse the clutch slightly as I am a pretty quick rider but have never roasted one in three motos. Any idea if oil or something may be an issue? I have never encountered a locked up lever from a burnt out clutch and hope it isnt a bigger issue.
I have seen guys rost clutches in 10 min in mud
Dont think its the oil
I agree that its not the oil as i have ran rotella for years.
The first thing to check is the cable. Disconnect at the lever and you should be able to work the cable in the outer by hand. Look inside the ign cover, check that everything is clear around the actuating arm.
The steel drive plates have to be able to slide along the rails inside the hub. Same with the fingers on the fibers inside the basket. If you have bad grooving of those parts, you might stick the clutch.
Behind the push cap, there is a rod and ball. I can't think of why these parts would have got hung up.
You've got to work your way from the outside in: lever, cable, actuating arm, hub, basket, cap, rod. Hopefully you turn up some damage or interference before you have to go further than the rod and ball.
The Shop
Redduk do you have a yz125? if so what clutch packs do you find best? Will probably go OEM, but I am a college student so riding budget is tight, but cheap internals usually cost more in the long run...
Edit: Appears pro circuit only make springs for the 250 and four stroke yamahas. Any other quality aftermarket springs?
Lots of info if you search it.
Good luck
You might also look into some clutch hub mods. You might 'port' the OEM hub to get a bit more oil into the pack. There will be threads about this on vital and/or thumpertalk.
Belray and Maxima have excellent dedicated 2-stroke trans oil which is better than the current Rotella formula.
I bought my KTM used at 20 hours and the trans oil was burned pretty badly. I've replaced the oil three or four times and I'm still getting a slight burning smell on the oil. I also need to check that my clutch is not slipping due to sacked out springs.
I usually replace my oil as soon as I have any clutch fade or not longer than 10 hours. My hydro clutch is auto-adjusting, so it's hard to tell, so I usually run 5-10hours. If I boil the coolant, that's another sign that I should swap the oil.
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