2013 yz125 help!!!!! Very slow

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2/13/2018 10:48 AM

Hey guys, I have a problem with my 2013 yz125. It's smokes a lot even when warmed up. Also it bogs heavy in tight corners and will die out. Last time I rode it I kept it on the throttle but it feels slow and smokes a lot. I have the bike mixed 32:1 and I have a lectron carb. That is well jetted. Would it be a powervalves problem or maybe the crankseals are bad. When I took of the top end it has a lot of milky sponge in the powervalves. Any help would be greatly appreciated. Also if anymore info is needed please comment. Thanks!!!

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2/13/2018 11:12 AM

Rebuild your top end. Your headgasket is leaking

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2/13/2018 12:06 PM

Top end was just done. By the Yamaha dealership

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2/13/2018 12:38 PM

luis97 wrote:

Top end was just done. By the Yamaha dealership

Head gasket. Drain the engine oil and if it’s any shade of grey or milky, water is getting in. I bet it needs a head gasket before it blows it.

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If you're not mixing gas, you're not haulin ass.

2/13/2018 1:56 PM
Edited Date/Time: 2/13/2018 1:57 PM

luis97 wrote:

Top end was just done. By the Yamaha dealership

TrailDigger wrote:

Head gasket. Drain the engine oil and if it’s any shade of grey or milky, water is getting in. I bet it needs a head gasket before it blows it.

So your telling me that If you blow a head gasket on a 2 stroke you will get coolant in the tranny fluid?! laughing I never knew. Or are you thinking that the head gasket and clutch side crank seal went at the same time?

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2/13/2018 2:48 PM

luis97 wrote:

Top end was just done. By the Yamaha dealership

Rule #1, dont let a dealership do your work.

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2/13/2018 3:01 PM

luis97 wrote:

Top end was just done. By the Yamaha dealership

TrailDigger wrote:

Head gasket. Drain the engine oil and if it’s any shade of grey or milky, water is getting in. I bet it needs a head gasket before it blows it.

JWACK wrote:

So your telling me that If you blow a head gasket on a 2 stroke you will get coolant in the tranny fluid?! laughing I never knew. Or are you thinking that the head gasket and clutch side crank seal went at the same time?

Had it happen on a CR125. PO had rebuilt the top end with a namura piston and had the head milled down. It blew out the head gasket and no idea how, but roasted the water pump seals. Either that or the seals were done before, but I had it happen.

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If you're not mixing gas, you're not haulin ass.

2/13/2018 3:48 PM

Thank you very much guys. I will be dissembling the top end and checking it out.

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3/26/2018 6:23 AM

You've been working this problem a long time. You've got other threads about it. In one of those threads it sounds like you've replaced everything but the transmission. Try setting the sag. That should do it.

Much ty

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3/26/2018 6:38 AM
Edited Date/Time: 3/26/2018 6:46 AM

If theres milky oil in the powervalve thats coolant from a bad head gasket. Did you notice a different smell from the exhaust smoke? Burning coolant is very white and gives off a sort of sweet smell.

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3/26/2018 7:11 AM

Harry Backmon wrote:

You've been working this problem a long time. You've got other threads about it. In one of those threads it sounds like you've replaced everything but the transmission. Try setting the sag. That should do it.

Much ty

I have my sag at 4", do I need to worry about bottom end bog?



Photo

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3/26/2018 11:57 AM

Harry Backmon wrote:

You've been working this problem a long time. You've got other threads about it. In one of those threads it sounds like you've replaced everything but the transmission. Try setting the sag. That should do it.

Much ty

slipdog wrote:

I have my sag at 4", do I need to worry about bottom end bog?



Photo

The dreaded bottom end sag will get you every time!

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much ty. How to spot a paid forum poster/artificial forum traffic producer (see list of actions/phrases below):

Copius pattern amounts of phrases like “Anyone have”..., “Anybody know?”.... and their variations.

Thoughts?
Any help is appreciated!
Thanks in advance!