KX Riders
Maintenance & Technical => KX250 / KX125 => Topic started by: mbrouk on May 26, 2013, 10:55:33 PM
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I have an 07 kx250 if shifts smooth through every gear and screams, except for 5th, why would this be happening?
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What happens when you try to shift into 5th?
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I lift the shifter and that's it it doesn't go anywhere. It feels like it only has 4 gears I don't get it. I bought it like this so I don't know what the previous owner did to it. I'd just like to know what the heck could be causing it.
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Maybe they removed 5th to save weight :roll: Sound like a bent fork to me.
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Bent or worn shifting forks, worn pins, worn drum, broken trans shaft snap ring.... I'm sure there are probably others...
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Well not quite sure where the shifting forks are but Im taking the bike apart now to see if I can find them. Thanks for the info guys!! I'll do some research to help me get through the work!
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Oh, do yourself a huge favor and get a Clymer manual.
It has a wealth of info in it that you will need.
Don't feel bashful about posting your progress or questions..
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I have an OEM manual will this be any help? Thanks again I'll keep you posted, so far I only have the plastics, subframe, shock, swingarm, and air box out of the way. Trying to decide how the hell I'm going to get this engine casing out of the frame. You don't happen to know if I have to take the head off first do you?
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I have an OEM manual will this be any help? Thanks again I'll keep you posted, so far I only have the plastics, subframe, shock, swingarm, and air box out of the way. Trying to decide how the hell I'm going to get this engine casing out of the frame. You don't happen to know if I have to take the head off first do you?
to take out the complete engine out of the frame,1. pull the swingarm as much as possible to the rear.
2. now you have to lift up the engine and a little bit more on the gear box. 3. turn i t with the gearbox first to the right side out of the frame ...but watch out, that it not slip out of your hands...
to install the engine, take these steps back... :-)
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While I'm in the middle of all of this do you think it'd be a bad idea to get my frame dipped in chrome??
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All depends on the look you are going for and why you want it chromed.
Remember that chrome is porous which is bad on a dirt bike considering the usage.
If you want a deep luster and to be more corrosion resistant then you need to get it copper plated, then Nickel plated and then chromed.
If you don't get it copper plated first you are asking for a rust problem on a dirt bike.
If you don't nickle plate it you won't get that deep luster most people want.
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Thanks alot sand, I had no idea. I was actually just wanting to sand blast it and paint it something that wouldn't wear off easily or rust thats why I was considering chrome but I didn't realize I needed to have it copper plated and then nickel plated to change its oxidation properties. What do most people refinish there frames with?
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most frame's are nickle plated. not crome. (old race frames etc.)
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most frame's are nickle plated. not crome. (old race frames etc.)
the frame of my 2000 gasgas ec300 were chromed and alu-subframe... very nice look but chrome has more weight than just paint and in case of weldings you have to rechrome the whole frame for an good look again...
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Going to try and have the gearbox opened tonight.... question , wwhen I had my clutch replaced the guy said the basket was severely worn... would this cause problems?
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And when I say problems I mean the issue with me not being able to shift into 5th, also while I have everything pulled off I may sandblast the frame and have it powder coated if its not too pricey. After seeing all this money I'm going to be putting into it I feel like selling it and buying a new 4 stroke! :(
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Everythings pulled off the bike I have the casing split now I need to figure out what size socket I need to get my clutch basket off, the biggest I have is 24mm. Once I get the clutch basket off I guess I'll be able to see the shift forks and determine what's causing my shifting issue.
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I appreciate everyone's input so far, hopefully you guys are leading me in the right direction lol
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Everythings pulled off the bike I have the casing split now I need to figure out what size socket I need to get my clutch basket off, the biggest I have is 24mm. Once I get the clutch basket off I guess I'll be able to see the shift forks and determine what's causing my shifting issue.
nut size 27 mm or 30 mm
a worn clutch is never the cause of shifting problems . a clutch gives grip or slip to the secondary drive, but you can always shift all 5 gears.
maybe the output-gear of first gear is removed and replaced with a bushing?? and another drum installed?? i know some mx- gp-worldchampionship-teams made something like that... cause of never using first gear and get less weight to the bike.
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I have the clutch basket off I can see the shift forks and everything but I'm not too familar with what is considered worn or what's considered good. I'll try and post some pictures of it and see if any of you can identify my issue.
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Some pics and questions, is my piston bad? I'm getting a motorcycle mechanic to look at my case tomorrow. I have no experience with this stuff so I need someone to diagnose my issue. I'll let you guys know what he finds.
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Some pics and questions, is my piston bad? I'm getting a motorcycle mechanic to look at my case tomorrow. I have no experience with this stuff so I need someone to diagnose my issue. I'll let you guys know what he finds.
detonation
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Does that mean my piston is bad? Lol
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Also... how do I know how big of a piston I need. I searched on eBay for pistons but it seems like they're all different mm. They close in size but still different mm.
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You will need to measure your cylinder.
If you don't know how or have the tools, take it to your nearest Kawi dealer and have them measure it for you.
Clean the inside of the cylinder really good so they can look at it for you and make sure it is still usable.
If I saw detonation like your piston shows I would get a new one.
While you have the top end off you should measure the rod to crank clearance..
And, after all that you need to figure out why you are having a detonation problem.
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What normally causes detonation problems? Running too lean or to rich?
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Took it to a Kawasaki dealer to have him look at the inside of my case... he says everything looks ok...but i think hes full of s**t. He seemed kinda irritated when I said I just wanted his advice and I was going to do the work myself. Anyway, I'll post pics of my shift forks in a couple minutes and see what you guys think. the pins are very straight and dont seem to have much wear if any on them. the drum may be slightly worn but not much. I'm so confused.
Please somebody help me.