2013 yz125 help!!!!! Very slow

luis97
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luis97
Edited Date/Time 3/26/2018 11:57am
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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kb228
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kb228 2/13/2018 11:12am
2/13/2018 11:12am
Rebuild your top end. Your headgasket is leaking
luis97
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luis97 2/13/2018 12:06pm
2/13/2018 12:06pm
Top end was just done. By the Yamaha dealership
TrailDigger 2/13/2018 12:38pm
2/13/2018 12:38pm
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.
JWACK
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JWACK 2/13/2018 1:56pm
2/13/2018 1:56pm Edited Date/Time 2/13/2018 1:57pm
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...
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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kb228
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kb228 2/13/2018 2:48pm
2/13/2018 2:48pm
luis97 wrote:
Top end was just done. By the Yamaha dealership
Rule #1, dont let a dealership do your work.
TrailDigger 2/13/2018 3:01pm
2/13/2018 3:01pm
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...
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?! :laugh: I never...
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.
luis97
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luis97 2/13/2018 3:48pm
2/13/2018 3:48pm
Thank you very much guys. I will be dissembling the top end and checking it out.
Harry Backmon 3/26/2018 6:23am
3/26/2018 6:23am
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
Caseclosed713 3/26/2018 6:38am
3/26/2018 6:38am Edited Date/Time 3/26/2018 6:46am
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.
slipdog
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slipdog 3/26/2018 7:11am
3/26/2018 7:11am
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...
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?





kzizok
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kzizok 3/26/2018 11:57am
3/26/2018 11:57am
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...
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? [img]https://p.vitalmx.com/photos/forums/2018/03/26/251905/s1200_Screenshot_2018_03_26_at_7.05.43_AM.jpg[/img]
I have my sag at 4", do I need to worry about bottom end bog?





The dreaded bottom end sag will get you every time!

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