yamagod95

Still having white smoke after piston and gaskets replaced!!! HELP

121 posts in this topic

Posted (edited)

I created a thread a couple weeks ago about having white smoke pouring out of my exhaust after a hard ride and i was told to replace my base gasket and head O rings. While i was in there doing that I threw in a new top end as well. Started the bike for the first time today to break it in and after about 10 minutes of idling i gave her some revs and still have heavy white smoke pouring out under throttle. Any other suggestions? Maybe water pump related?

Bike is an 06 yz125

Edited by yamagod95
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17 minutes ago, yamagod95 said:

Any other suggestions? Maybe water pump related?

Have you tested if your head is warped? 

If waterpump related the water has to cross the oil barrier first and pass another seal. 

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3 minutes ago, arnego2 said:

Have you tested if your head is warped? 

If waterpump related the water has to cross the oil barrier first and pass another seal. 

No i have not. But i think the head is fine it looked perfect and the piston moved smoothly

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Posted (edited)

2 minutes ago, yamagod95 said:

But i think the head is fine it looked perfect and the piston moved smoothly

I can't see a warped head by eye. I need a window to make it visible.

Recognizing a warped head by eye is about the same as testing your compression with your thump.  

Edited by arnego2
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Just now, arnego2 said:

I can't see a warped head by eye. I need a window to make it visible.

Recognicing a warped head by eye is about the same as testing your compression with your thump.  

Gotcha, i just don't think its that. But i could be wrong, hopefully not though

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Just now, yamagod95 said:

But i could be wrong, hopefully not though

Easy to repair, some sandpaper and a straight glass aka window and after 15 min it should be good.  

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Just now, arnego2 said:

Easy to repair, some sandpaper and a straight glass aka window and after 15 min it should be good.  

I briefly sanded it on a block before i reinstalled it but maybe i didnt enough

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Do you see any wash marks on your piston top?  Antifeeze/coolant will steam clean it. Don't go crazy on that head and make sure you are using a plate of glass and not a sanding block.  Are you getting any severe bubbling in the radiator when you run it (cool of course and with the cap off)?.  Check the seal on the water pump.. Are the o-ring seats clean and free of any type of corrosion?  Just a few things to look at.

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11 minutes ago, Northport said:

Do you see any wash marks on your piston top?  Antifeeze/coolant will steam clean it. Don't go crazy on that head and make sure you are using a plate of glass and not a sanding block.  Are you getting any severe bubbling in the radiator when you run it (cool of course and with the cap off)?.  Check the seal on the water pump.. Are the o-ring seats clean and free of any type of corrosion?  Just a few things to look at.

I installed a brand new piston last night. And while i was breaking the top end i let the bike idle for about 10 minutes, then as soon as i gave it a few revs instantly massive white smoke. I did notice a tiny tiny bit of over flow from the radiators. But i was just thinking that could've been just because i just refilled the coolant after the rebuild. 

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What’s your water pump look like? Pretty sure the shafts can wear out and allow coolant by.

If nothing else, buy a new gasket kit for the water pump and reseal it. Gaskets are cheap.

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Just now, Studhaeuser said:

You sure its coolant? Did you pressure test it? 

No im not 100 percent sure its coolant. People have told me white smoke is from coolant so im thinking it could be. Which is why i replaced the base gasket and head O rings. But still same problem

1 minute ago, MaybeMe said:

What’s your water pump look like? Pretty sure the shafts can wear out and allow coolant by.

If nothing else, buy a new gasket kit for the water pump and reseal it. Gaskets are cheap.

Havnt checked my water pump yet. Definitely need too

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White smoke can also be trans fluid. Did you pressure test it?

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Just now, Studhaeuser said:

White smoke can also be trans fluid. Did you pressure test it?

I dont have a pressure tester unfortunately so no.

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2 minutes ago, yamagod95 said:

I dont have a pressure tester unfortunately so no.

I'd start there. Keep an eye on coolant and trans oil levels. A bad water pump seal wont let coolant into the combustion chamber. Theres also the possibility of some oil buildup from trail riding burning off when everything gets hot. Burning coolant smell is pretty distinct but Im assuming youre not familiar. 

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11 minutes ago, Studhaeuser said:

I'd start there. Keep an eye on coolant and trans oil levels. A bad water pump seal wont let coolant into the combustion chamber. Theres also the possibility of some oil buildup from trail riding burning off when everything gets hot. Burning coolant smell is pretty distinct but Im assuming youre not familiar. 

If its coolant doesn't that mean that it's somehow getting into the combustion chamber? The burning smell I get smells like the bike is over heating so to speak. Also how do i check trans oil level? By just removing the bolt?

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Did you clean out the power valve cavity?

what brand and mix ratio oil do you use?

is your silencer packing saturated with oil? 

Is your jetting stock or rich?

Does the engine idle clean after the top end?

a little white oil smoke happens but a ton of smoke is a problem 

Is there a lot of “spooge” running out of the silencer?

 

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Run it with the rad cap off and see if there’s any difference 

wont pressure up that way..

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17 minutes ago, GCannon said:

Did you clean out the power valve cavity?

what brand and mix ratio oil do you use?

is your silencer packing saturated with oil? 

Is your jetting stock or rich?

Does the engine idle clean after the top end?

a little white oil smoke happens but a ton of smoke is a problem 

Is there a lot of “spooge” running out of the silencer?

 

 Cleaned the power valves thoroughly 

I run 36:1 belray h1r

Silencer is new 3 rides on it

jetting is stock

Engine was idling very high at first start after new top end but eventually settled down.

No spooge at all

11 minutes ago, Spartan077 said:

Run it with the rad cap off and see if there’s any difference 

wont pressure up that way..

If that helps. What will that tell me. Somethings telling me its crank seals.

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