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2016 kx450 smoke 15 hours

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So the deal is I have a 2016 kx450 that started smoking at 15 hours . Mostly does it when cold but sometimes a little bit when warmed up although it seems to be intermittent and color appears to be blue from what I can see . Bike never smoked all the way until now I've owned it since new, always did maintenance as I should I've had a lot of bikes never really had a four stroke that smoked. 

Took bike to dealer I bought it from because I thought smoke was strange on a bike with 16 hours. They confirmed my 16 hours on the bike and did a leak down test . Said bike needed a top end and put camera in cylinder and said inside cylinder has light scratches . None of that sounds right to me at all . Bike has never seen the rev limiter. I just ride practice days at the tracks. Sorry for the long post 

bike still starts second kick and runs and rides great. 

 

anybody have any input ? Thanks 

 

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maybe that workshop is bored and got nothing to do ?

I'd ignore it... 16hrs is nothing...probably never needed valve shimming and just let it smoke every now and then..

did they say why it needs a topend rebuild ?

they probably did the leak down test with exhaust cam on decompression...

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Yes they said it needed a top end and a cylinder because the scratches they said they saw in there and said it didn't pass leak down test. Everything else was in spec valve wise they said. I personally wouldn't even think about the top end until 30-35 hours on my crf450 I had, but this thing does smoke once in a while not crazy but you can see It if you look, just didn't know if this was a kawi trait. My cr250 smokes but I didn't think my 450 should lol shops very busy couldn't even get me in for 3 weeks. 

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ok... here my experience with a 13 model.. bought it with maybe 30 hours on it.. total run down.. never cleaned the airfilter... or checked valves.. intake valves started to move at 70 hours..rebuild after a total of 110hours.. new pisiton, rings and valves..

maybe ask about the scratches in the cylinder, can be a broken piston ring (from day one..), did they say where it leaked ? through valves or piston ?

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Yeah they said the rings are worn. Just seems hard to believe at 15 hours. Just funny you look in the owners manual an it says piston and rings at 15 hrs.  I think I'll get a look in the cylinder myself an know for sure . 

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The way I see it they just wanted to do top end and cylinder as a way to say "well it's fixed"  I haven't taken it back to the track since the day it smoked , but I've rode it in my drive way about 6 times since then trying to duplicate the smoke to No avail . Beats me lol just runs to good to need a top end just weird it smokes once in a while ? The bike is for sale currently I just wanted to make sure nothing's wrong with it first . Going back to the 2 stroke world.

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i have a 17 when i run the black chip if i leave the cold start pulled out for a long time, when i rev it it smokes quite a bit but it clears up , mines got 52 hr on it and i woundt even consider doing  top end , not till 70-80 hrs, the only way yours could be doing that is if dirt got in there, oil  and gas dont score the cylinder, dirt does

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Yeah I agree could only be dirt but I'm really good about my air filters an I've never seen a spec of anything in my air boot ever or inside of filter. I think the dealer is full of it! Although they are a big name dealer they give gared steinke a ride an a few other big guys. The smoke really only concerned me the one time ever since  I haven't really noticed it . Im not gonna worry about it anymore the thing still rips ! 

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I think you mean white smoke. Blue smoke is oil .black is fuel. But my bike hasn't smoked since the one time must have been fuel issue. It's for sale now though I've been riding my cr250. 

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On 9/6/2017 at 6:18 PM, Pnw117 said:

So the deal is I have a 2016 kx450 that started smoking at 15 hours . Mostly does it when cold but sometimes a little bit when warmed up although it seems to be intermittent and color appears to be blue from what I can see . Bike never smoked all the way until now I've owned it since new, always did maintenance as I should I've had a lot of bikes never really had a four stroke that smoked. 

Took bike to dealer I bought it from because I thought smoke was strange on a bike with 16 hours. They confirmed my 16 hours on the bike and did a leak down test . Said bike needed a top end and put camera in cylinder and said inside cylinder has light scratches . None of that sounds right to me at all . Bike has never seen the rev limiter. I just ride practice days at the tracks. Sorry for the long post 

bike still starts second kick and runs and rides great. 

 

anybody have any input ? Thanks 

 

Do you warm up your engine the proper way?

Chek your manual if you are not sure.

Leave the throttle for the first 45-60 secons

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On 9/7/2017 at 5:52 AM, Bernie Nottelling said:

ok... here my experience with a 13 model.. bought it with maybe 30 hours on it.. total run down.. never cleaned the airfilter... or checked valves.. intake valves started to move at 70 hours..rebuild after a total of 110hours.. new pisiton, rings and valves..

maybe ask about the scratches in the cylinder, can be a broken piston ring (from day one..), did they say where it leaked ? through valves or piston ?

you ride it on trails or MX track !?

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