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May 16th, 2019, 01:40 AM   #11
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Damn :/ Sorry to hear that
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May 16th, 2019, 01:46 AM   #12
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I'm missing something here. How does a valve stem seal find its way into the cylinder?

Any pictures of the remains?

Cheers... Paul
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May 16th, 2019, 03:19 AM   #13
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Originally Posted by tinwelp View Post
I'm missing something here. How does a valve stem seal find its way into the cylinder?

Any pictures of the remains?

Cheers... Paul
I was having the same thoughts? Maybe he meant the valve seat, but i cannot see how a stem seal would get in there unsless someone assembled the engine with it in the cylinder....
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May 16th, 2019, 04:35 AM   #14
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Just going by what the manual calls it.. its the metal cone looking piece at the bottom of the intake valve stem.. its a 10 dollar piece.. got shattered, valve opened, pieces fell in. Al i can think of.. also habe pics but havent sprted out how to post em here.. either way.. anyone wanna buy a parts bike.. lol gonna cost me 2500 cdn for new parts.. i will just buy a new bike at that point.
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May 16th, 2019, 07:27 AM   #15
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Curious. The stem seal actually fits onto the top of the valve guide... and the top of the valve guide is inside the valve spring. In other words, the stem seal lives in the same section of the engine as the camshaft. Its purpose is to stop oil from the cambox leaking into the intake. There's no way the seal itself can gain access to the inlet port.

Are you sure it's not some other part that's been inhaled by the engine through the intake? Have you recently dismantled any part of the intake or taken the spark plug out, such that some piece may have fallen inside the engine?

Whatever the cause, what a bummer... and particularly so on a new bike.

Cheers... Paul

Last edited by tinwelp; May 16th, 2019 at 07:37 AM.
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May 16th, 2019, 10:32 AM   #16
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Part number 5 in the valve section of reapair manual. Thas whats missing, and busted up on cylnder head and piston

*edit- also spring retainer was also smashed up top, but still intact.

Last edited by yetman; May 16th, 2019 at 11:12 AM.
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May 17th, 2019, 12:28 AM   #17
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Man I’m sorry to hear this. I don’t remember hearing about this failure in these bikes before :/ Seems like a rare and unlucky occurrence.

In case it’s of interest then I think a rebuild I could be done for less than CAD 2500 in parts. The head might be repairable by a machine shop, or a number of alternate heads can be used - I believe they interchange between the 390/450/570, and then I also think that a number of KTM heads work too if modified a little (tapped for oil return line); see forum posts here. So there should be something used and good out there. Then Wössner and ProX make pistons. These also interchange between the 390 and similar years of the KTM 400. Those ought to be the biggest items right? And finally these motors are rather pleasant to work on, so it could be allright in the end - if you want to go that route.
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May 17th, 2019, 05:49 AM   #18
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2203.00 cdn plus tax.. just got my quote from the ktm dealer, unfortunately i am unable to fork that out after just buying the bike a week ago.. she will gonin storage i spose..thanks for all the help and support to everyone! Ur all legends.. hopefully i will revive her one day
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May 17th, 2019, 06:29 AM   #19
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Dang!! :'(

Out of curiosity, do you have that 2203 CND itemized?
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May 17th, 2019, 06:43 AM   #20
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Yessir! Needs a a new head, full valve kit, piston and cylinder kit, and according gaskets.. plus the ignition cover one as well.

**am at work so dont have the part numbers my friend.. but thats it in a nutshell.. whole entire top end..

Last edited by yetman; May 17th, 2019 at 08:18 AM.
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