• 4 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     TE = 4st Enduro & TC = 4st Cross

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

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2012 TXC smokes

motohio

motohio

Husqvarna
AA Class
I have a TXC 250 with about 4 hours on it that smokes pretty good. It doesnt smoke when you are riding it or when the revs are stedaly above idle. If you let it idle for 10 seconds or so and then crack the throttle it blows a big cloud of blue smoke. Any ideas? I'm trying to figure out if this sympton is more likely for the valve seats/seals to be bad or the rings on the piston need replaced. It starts up fine and makes good power. Any thoughts or suggestions would be greatly appreciated.

Thanks, Kirk
 
My 2006 TE250 does the same thing if it has too much oil in it... that is a different motor, but maybe?
 
I bet the rings just need some time to bed in. My 449 used to smoke slightly on start until it had about 500 miles on it. I say just keep ridin'
 
crank breather check is also in order. as you all know blue smoke is oil burning. oil from air filter, oil from crank breather into intake tract, from ring seal leak, from valve stem/seal leak, over fill, those are about the only way you are getting cumbustion chamber oil, unless you used the premix fuel can by accident.
 
Tinken said:
Maybe it needs Nicoderm CQ?
Click to expand...

HAHA.

I rode a hard 30 min moto last night, and came up with a few observations. It does'nt smoke when I'm riding as I had some people watching. When I stop and blip the throttle is when I get puffs of blue smoke.. So here is the interesting part about it all, If I leave it on the kick stand it doesnt smoke at all. If I stand it up straight or lean it to the right side is when the smoke comes back. I'm thinking that it is a valve seal on the right side of the head, does this make since? Im planning on tearing it down in a few days and will get to the bottom of it.
 
If it's your rings, under throttle, the pressure forces the rings outward against the cylinder walls. Your engine will smoke and burn small amounts of oil for 20 hours. The rings will eventually seat and oil burning will seize. I suggest you change your oil around the first 100 miles and use synthetic.

Is this a new bike or rebuilt?
 
motohio said:
...If I leave it on the kick stand it doesnt smoke at all. If I stand it up straight or lean it to the right side is when the smoke comes back....
Click to expand...
My crank breather pipe/tube is on the right hand side, and it does the same thing if there is too much oil in it..
 
Tinken said:
If it's your rings, under throttle, the pressure forces the rings outward against the cylinder walls. Your engine will smoke and burn small amounts of oil for 20 hours. The rings will eventually seat and oil burning will seize. I suggest you change your oil around the first 100 miles and use synthetic.

Is this a new bike or rebuilt?
Click to expand...


This is a new bike,with about 4 hours on it, that starts up fine and runs good. The oil level is correct, and the breather off the valve cover is clear. I tore it down yesterday and dont see any issues, other than alot of oil in the cylinder and alot of carbon on the valves and ports, even the intake valves. This motor is burning more oil than normal. The valve seals appear to be good, and the rings have the correct amount of gap. The cylinder looks very fresh with out any damadge. The piston seems to be egg shaped but when measured front to back it is in spec. Going to inspect more today.

Thanks for all the suggestions.
 
The oil was at the bottom of the sight glass cold? Sounds to me like a new bike just needing to break in. Happy riding. :)
 
Ok, so yesterday was the first time that I could get out to ride it. It is still smoking, dangit :banghead:. It's got me stumped, I dont get why it would not smoke when sitting on the side stand? Here is everything that I have done. Replaced all valve seals, Replaced all piston rings, Changed oil with synth oil and have a low amount in the bike. Removed breather line from valve cover back to airbox and routed the line straight down from the valve cover like the TC models. I think it might just get rode as is, as I dont know what else to do. Any suggestions?

Kirk.
 
Food for thought. I built 70 gto years ago. I fired the motor with synthetic/ and EOS GM supplement. Couldn't get the darn thing from smoking/using oil. I ended up running it with regular oil. I had the oil so slick that engine wouldn't break in. Then went synthetic/zinc oil additive.

Is your breather hose plugged anywhere? Sure it's oil not antifreeze? you could loosen your cap to see what happens if it doesn't build pressure? Just thoughts? Maybe dealer could do some sort of leak down test?
 
dartyppyt said:
Is your breather hose plugged anywhere? Crank seal? Center case gasket? Any oil you notice in bottom of crank? Could of been casting pit in cases that sucks oil in crank? Just thoughts? Maybe dealer could do some sort of leak down test?
Click to expand...
I believe he is talking about a TXC250 four stroke.
But yes, I do believe it just needs to have the rings seat. I would recommend staying with synthetic oil and letting the rings seat slowly and safely, doesn't matter if it smokes a little for awhile right? Kind of like a 007 smoke screen... :cool:
 
Thanks for the replies! Yes, its a 4t TXC250. It's oil smoke, as it has lowered the oil level in the sight glass from burning, no signs of coolant usage and no smell. I believe it has good piston compression as it starts up instantly! The plan right now is to ride it and see if the piston rings seat after a few hours. I will update this with any changes.
 
motohio said:
Thanks for the replies! Yes, its a 4t TXC250. It's oil smoke, as it has lowered the oil level in the sight glass from burning, no signs of coolant usage and no smell. I believe it has good piston compression as it starts up instantly! The plan right now is to ride it and see if the piston rings seat after a few hours. I will update this with any changes.
Click to expand...

I will be @ Hall's tomorrow. I will ask Jay or the mechanics.
 
This might be worth a phone call. Call and speak to Jay Hall @ Hall's in Springfield, IL

I asked him about your bike. He said that they are lowering some oil levels. Pretty sure he said they are dropping to 800, 850 cc (it's like 1/4 way up on sight glass. I would feel more comfortable having you call him and don't do anything till you talk to him. Another guy there is using a high compression piston and it was doing the same thing. Let us know how it comes out/your findings.
 
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