Kx125 won’t fire

Paw Paw 271
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Paw Paw 271 7/31/2018 8:35am
7/31/2018 8:35am
Poor ring and piston fit to the cylinder will cause the blow by. Your photos show that the engine has been run, however. I did not see the ring photo, but if not properly seated when installed it will get screwed up.
The bottom side of the piston also shows a leaking crank seal on the clutch side.

Paw Paw
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ObiThaMonster
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ObiThaMonster 7/31/2018 9:08am
7/31/2018 9:08am
Paw Paw 271 wrote:
Poor ring and piston fit to the cylinder will cause the blow by. Your photos show that the engine has been run, however. I did not...
Poor ring and piston fit to the cylinder will cause the blow by. Your photos show that the engine has been run, however. I did not see the ring photo, but if not properly seated when installed it will get screwed up.
The bottom side of the piston also shows a leaking crank seal on the clutch side.

Paw Paw
Ring is the very last photo.....as far as crank seal.....please tell me I don’t have to slip the case lol
kb228
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kb228 7/31/2018 9:11am
7/31/2018 9:11am
Paw Paw 271 wrote:
Poor ring and piston fit to the cylinder will cause the blow by. Your photos show that the engine has been run, however. I did not...
Poor ring and piston fit to the cylinder will cause the blow by. Your photos show that the engine has been run, however. I did not see the ring photo, but if not properly seated when installed it will get screwed up.
The bottom side of the piston also shows a leaking crank seal on the clutch side.

Paw Paw
ObiThaMonster wrote:
Ring is the very last photo.....as far as crank seal.....please tell me I don’t have to slip the case lol
On kawis the crank seals are inside the cases. So yes you have to split
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ObiThaMonster
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ObiThaMonster 7/31/2018 9:56am
7/31/2018 9:56am
Dammit! Lol was hoping to avoid this until the fall

The Shop

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Paw Paw 271
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Paw Paw 271 7/31/2018 10:36am
7/31/2018 10:36am
The ring was not properly seated when installed, from photo.

Paw Paw
ObiThaMonster
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ObiThaMonster 8/1/2018 6:10am
8/1/2018 6:10am
Spent a few hours last night scraping and scrubbing 20 year old mud, oil, gunk, and god knows what else off the outter engine case......it looks pretty decent....will put in a lil more work today as I’m waiting for my piston and gaskets to be delivered ....actually was kinda stoked because the kid I bought the bike from spray painted everything......EVERYTHING....and what ever he didn’t paint has some kinda over spray lol.....but I was going over parts with a wire brush and it’s pulling the spray paint off so effortlessly I just said eff it and went to town lol.....

I do wanna know if I can use the wire brush in the surfaces where the gaskets sit....trying to get up as much of the old gasket as possible in the most efficient manner possible.....


Thanks for your continuous help guys!
lcgordon711
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lcgordon711 8/1/2018 6:17am
8/1/2018 6:17am
Use a razor blade or a gasket scraper where the gasket sits. Don't use a wire brush. Even be careful with a razor blade.
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ObiThaMonster
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ObiThaMonster 8/1/2018 11:51am
8/1/2018 11:51am
About halfway through installing the new piston and top end gaskets I’m starting to believe 80% of the problem was the piston.....the old one slid in and out fairly easily this new one is noticeably tighter even without the ring installed....bout to finish up and update u guys a lil later
ObiThaMonster
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ObiThaMonster 8/1/2018 11:52am
8/1/2018 11:52am Edited Date/Time 8/1/2018 11:53am
Oh real quick....wat are these for?
kb228
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kb228 8/1/2018 12:36pm
8/1/2018 12:36pm
ObiThaMonster wrote:
Oh real quick....wat are these for? [img]https://p.vitalmx.com/photos/forums/2018/08/01/278157/s1200_image.jpg[/img]
Oh real quick....wat are these for?
They go on your expansion chamber where it meets the cylinder. They aid the copper gasket in sealing.
ObiThaMonster
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ObiThaMonster 8/3/2018 8:45am
8/3/2018 8:45am
Is it safe to use rv coolant in my bike? If so is the usual 50/50 ok?
Hondas4Life3
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Hondas4Life3 8/3/2018 8:52am
8/3/2018 8:52am Edited Date/Time 8/3/2018 8:52am
ObiThaMonster wrote:
Is it safe to use rv coolant in my bike? If so is the usual 50/50 ok?
Yeah regular coolant is fine. If your mixing it yourself use distilled water not tap water. Tap water will corrode the aluminum over time. If your buying the 50/50 already mixed solution just pour it strait in
ObiThaMonster
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ObiThaMonster 8/3/2018 9:54am
8/3/2018 9:54am
Actually nvm it says not for use in automotive radiators
ObiThaMonster
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ObiThaMonster 8/6/2018 4:32pm
8/6/2018 4:32pm
new issue....Sunday I went out to ride with a couple of buddies and realized that in 1st gear WOT I get about 1/4 of the power I should get.....bike bogs a little then revs but never really “bites” and the powerband never kicks in.....upshift to second it bogs a little but starts to get some power, but right before the band kicks it sputters, (so what I attempted to do was avoid the powerband and upshift just a little sooner while I’m still getting decent power but then the bike bogs out but I guess since I’m in 3rd a little sooner the bike opens up and is about 60% of what she should be but from here through 6th gear it maintains steady power and you can tell it performs way better in the top end.



so today I tear her down to clean the carb, like a buddy suggested I do and that’s when I discovere it......or the lack there of.



my pilot jet is broken...I guess the previous owner “forgot” to tell me he’d broken it so it was never laying in the float bowl or I would have known. Only half of the head of the jet remains the threaded part is still inside carb....what can I do short of drilling it out?
Paul_Pitzonka
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Paul_Pitzonka 8/6/2018 4:41pm
8/6/2018 4:41pm
Very carefully with a small left handed drill bit or an easy out is probably your best bet

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BobPA
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BobPA 8/6/2018 5:28pm
8/6/2018 5:28pm
Paw Paw 271 wrote:
Poor ring and piston fit to the cylinder will cause the blow by. Your photos show that the engine has been run, however. I did not...
Poor ring and piston fit to the cylinder will cause the blow by. Your photos show that the engine has been run, however. I did not see the ring photo, but if not properly seated when installed it will get screwed up.
The bottom side of the piston also shows a leaking crank seal on the clutch side.

Paw Paw
ObiThaMonster wrote:
Ring is the very last photo.....as far as crank seal.....please tell me I don’t have to slip the case lol
kb228 wrote:
On kawis the crank seals are inside the cases. So yes you have to split
That is only for the 250’s. 125’s can be replaced without splitting.
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ObiThaMonster
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ObiThaMonster 8/6/2018 5:37pm
8/6/2018 5:37pm
ObiThaMonster wrote:
Ring is the very last photo.....as far as crank seal.....please tell me I don’t have to slip the case lol
kb228 wrote:
On kawis the crank seals are inside the cases. So yes you have to split
BobPA wrote:
That is only for the 250’s. 125’s can be replaced without splitting.
????? goodness
ObiThaMonster
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ObiThaMonster 8/7/2018 8:48am
8/7/2018 8:48am
If you look closely u can see there’s pretty much nothing for me to grab on to......



Anyone know what this part is called or if I can even buy it separate from the carb?


kb228
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kb228 8/7/2018 10:20am
8/7/2018 10:20am
ObiThaMonster wrote:
Ring is the very last photo.....as far as crank seal.....please tell me I don’t have to slip the case lol
kb228 wrote:
On kawis the crank seals are inside the cases. So yes you have to split
BobPA wrote:
That is only for the 250’s. 125’s can be replaced without splitting.
Good call. Could have sworn my old one was on the inside. Confirmed by looking at the microfiche. My bad
kb228
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kb228 8/7/2018 10:23am
8/7/2018 10:23am
ObiThaMonster wrote:
If you look closely u can see there’s pretty much nothing for me to grab on to...... [img]https://p.vitalmx.com/photos/forums/2018/08/07/279245/s1200_image.jpg[/img] Anyone know what this part is called or...
If you look closely u can see there’s pretty much nothing for me to grab on to......



Anyone know what this part is called or if I can even buy it separate from the carb?


What you might be able to do is drill it out so that a small long shafted torx bit can be hammered into the hole of the jet. Then use heat to heat up the aluminum and back out the jet with the torx bit.

Only struggle i can think of is finding one small enough.

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