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Extreme carbon build up???

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20190930_231103.thumb.jpg.83ffca126433a7d24eb291b235076eac.jpg20190930_230238.thumb.jpg.b85ef5a26d51f0cd185e9da22ada3d9e.jpgNear the end of this season my klx125 started to smoke a bit. I just took apart the top end to find an excesive amount of carbon build up on the top of the piston and head. I was surprised as the bike runs fine besides the small amount of smoke. Bought the bike used last year and this is the first time I've had the top end apart. Any ideas of what could cause this build up???

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Whar year bike ?    Looks like it has been burning oil for a while ...    install rings in cyl. And check end gap .... could have been just  re ringed ?  Mic. Cyl. Bore ......   new to you ?  Or  original owner  ...

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9 hours ago, bweighmaster said:

Whar year bike ?    Looks like it has been burning oil for a while ...    install rings in cyl. And check end gap .... could have been just  re ringed ?  Mic. Cyl. Bore ......   new to you ?  Or  original owner  ...

Bike is from 2004, just got it at the start of summer so yeah for all I know it could be 15 years of run time on that piston. I'm gonna measure everything today and see if anything is way out on it. Keep ya updated!

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Worn / damaged piston rings and/or cylinder

or, a bad intake valve stem seal.

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Looks like there is adequate valve to piston clearance.  No crescents from the edge of the valves protruding into the carbon.  My guess would be valve stem seals as well.

Edited by donwann

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12 minutes ago, Eric@ScottsPerformance said:

I am confused.... says he has a 2 stroke but shows a 4 stroke?

 

I think you're thinking of a KX125. And he's in the wrong forum.

Edited by Rickf92592

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2 minutes ago, Rickf92592 said:

I think you're thinking of a KX125.

 

He did post it in the Kawi 2 stroke section. I bet he is runnin pre-mix thinking that his bike is a two stroke.

Edited by woods-rider
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On 10/1/2019 at 2:38 PM, Damon367 said:

20190930_231103.thumb.jpg.83ffca126433a7d24eb291b235076eac.jpg20190930_230238.thumb.jpg.b85ef5a26d51f0cd185e9da22ada3d9e.jpgNear the end of this season my klx125 started to smoke a bit. I just took apart the top end to find an excesive amount of carbon build up on the top of the piston and head. I was surprised as the bike runs fine besides the small amount of smoke. Bought the bike used last year and this is the first time I've had the top end apart. Any ideas of what could cause this build up???

 

12417560_1022076201216751_4947551337231908144_n.jpg

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17 hours ago, Eric@ScottsPerformance said:

I am confused.... says he has a 2 stroke but shows a 4 stroke?

 

Never said it was a 2 stroke

Just now, Damon367 said:

Never said it was a 2 stroke

My apologies I see where the confusion was, my bad

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17 hours ago, Rickf92592 said:

You know you don't need premix in that bike, right?

Yeah I know lol I've always just put regular pump gas in her, cant say what buddy before me was doing though

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2 hours ago, Damon367 said:

Never said it was a 2 stroke

My apologies I see where the confusion was, my bad

Its ok- I am simple!

 Does the bike use oil? It might very well be a bad valve seal.

 

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No matter what engine it is it has a really bad score mark on the side of the piston. 

You might want to check that out. 

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11 hours ago, shrubitup said:

Interesting power valve linkage on the left 

You mean yours don't have that ??

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