Help please

govolsdeep1983
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govolsdeep1983
Edited Date/Time 5/23/2021 4:05am
So I just did the top end on my 17 ktm 350 sxf.this is my first time doing it i've built several cars back in the day.i've got it back together starts great but whenever it first starts it's smokes a good amount and then once it warms up it goes away I put a B piston in it and it was .001 mm out of Maximum spec? could that be the cause or do you think the new valve seals are leaking it was a moose racing gasket kit and I am very puzzled at what's going on thanks for the help let me also state I am no professional by any means I felt like I messed around with that piston getting it to go in the cylinder for a little over an hour should I have maybe put the piston in the cylinder using the tool first instead of doing it from the bottom I also put assembly lube around the cylinder wall. Thanks for the help
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526
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526 5/13/2021 4:42am
5/13/2021 4:42am
If you were struggling to get the piston in did damage the oil scraper rings? they are very fragile and can get damaged easy. How did the oil pattern look on the cylinder wall when you cycled the piston up and down before installing the head?
davis224
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davis224 5/13/2021 5:17am
5/13/2021 5:17am
Find someone with a leak down tester
LungButter
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LungButter 5/13/2021 5:31am
5/13/2021 5:31am
Y’all dudes that do 4 stroke motor work on your own with little to no experience got balls of steel!

Respect.
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Factor E
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Factor E 5/13/2021 5:35am
5/13/2021 5:35am
Did you stagger the openings of the piston rings?
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Thisusernameisavailable 5/13/2021 6:03am
5/13/2021 6:03am
The oil rings on those are particularly fiddly.

Did you fit genuine parts (I’ve had trouble with vertex in a 350..)

I now only fit genuine pistons in any KTM 4 stroke.

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govolsdeep1983
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govolsdeep1983 5/13/2021 6:03am
5/13/2021 6:03am
Factor E wrote:
Did you stagger the openings of the piston rings?
Yes i did stagger the end gaps.I didn't even think to cycle the piston up and down without the head on. If I damage the oil ring would it not smoke all that time?after it warms up it stop smoking as you can see in the video thats whats got me puzzled
govolsdeep1983
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govolsdeep1983 5/13/2021 6:14am
5/13/2021 6:14am
LungButter wrote:
Y’all dudes that do 4 stroke motor work on your own with little to no experience got balls of steel!

Respect.
It's really just more terrifying than anything lol really isn't too bad then again here I am having a problem haha
526
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526 5/13/2021 7:41am
5/13/2021 7:41am
Thisusernameisavailable wrote:
Oh and I always fit the piston in the cylinder before putting the piston on the rod- it’s much easier than trying to get the rings...
Oh and I always fit the piston in the cylinder before putting the piston on the rod- it’s much easier than trying to get the rings in the bore with it on.
Don't you struggle getting the wrist pin clip in with the cylinder in the way?
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govolsdeep1983
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govolsdeep1983 5/13/2021 7:41am
5/13/2021 7:41am
Think im gonna take a borescope and look down and see if I see any oil city on top of the cylinder
526
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526 5/13/2021 8:40am
5/13/2021 8:40am
Factor E wrote:
Did you stagger the openings of the piston rings?
govolsdeep1983 wrote:
Yes i did stagger the end gaps.I didn't even think to cycle the piston up and down without the head on. If I damage the oil...
Yes i did stagger the end gaps.I didn't even think to cycle the piston up and down without the head on. If I damage the oil ring would it not smoke all that time?after it warms up it stop smoking as you can see in the video thats whats got me puzzled
Yes it would smoke all the time and bore would be scorn.
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Falcon 5/13/2021 10:50am
5/13/2021 10:50am
LungButter wrote:
Y’all dudes that do 4 stroke motor work on your own with little to no experience got balls of steel!

Respect.
govolsdeep1983 wrote:
It's really just more terrifying than anything lol really isn't too bad then again here I am having a problem haha
I'm with Lung Butter. I'd be scared that the flux capacitor wouldn't mate up with the oil journals on the thingamabump, and then the rohipnovator would seize against the pistonifier before the thing even warmed up.
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murph783
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murph783 5/13/2021 10:52am
5/13/2021 10:52am
LungButter wrote:
Y’all dudes that do 4 stroke motor work on your own with little to no experience got balls of steel!

Respect.
Gotta learn somehow
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lostboy819
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lostboy819 5/13/2021 12:04pm
5/13/2021 12:04pm
Cant tell from the video, is it blue smoke like oil or a whiter smoke? Can you smell oil or is it a sweet smell like coolant ? Could be raw fuel also
govolsdeep1983
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govolsdeep1983 5/13/2021 12:18pm
5/13/2021 12:18pm
lostboy819 wrote:
Cant tell from the video, is it blue smoke like oil or a whiter smoke? Can you smell oil or is it a sweet smell like...
Cant tell from the video, is it blue smoke like oil or a whiter smoke? Can you smell oil or is it a sweet smell like coolant ? Could be raw fuel also
Its 100% oil
lostboy819
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lostboy819 5/13/2021 1:02pm
5/13/2021 1:02pm
lostboy819 wrote:
Cant tell from the video, is it blue smoke like oil or a whiter smoke? Can you smell oil or is it a sweet smell like...
Cant tell from the video, is it blue smoke like oil or a whiter smoke? Can you smell oil or is it a sweet smell like coolant ? Could be raw fuel also
govolsdeep1983 wrote:
Its 100% oil
Bummer, the other two can be a easy fix. hope it does not turn out to be a high dollar repair.

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govolsdeep1983
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govolsdeep1983 5/13/2021 7:55pm
5/13/2021 7:55pm
I could be wrong but it looks like the valve stem seals are leaking on the exhaust side
WEAL
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WEAL 5/14/2021 2:22pm
5/14/2021 2:22pm
take it apart again and check the oil scraper - the valve guides are not leaking as the stems are dry and all the oil in the exhaust track is blown up from the combustion chamber. If you lift the head you will find all four valve pockets partly filled with oil. On austrian bikes it is the easy way to fit the piston to barrel and then onto the conrod. The piston pin clip has a hook on one end and is thus very easy to fit if you have the correct tool.
govolsdeep1983
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govolsdeep1983 5/14/2021 2:30pm
5/14/2021 2:30pm
OK thanks for the info I'm going to terret apart this weekend I went ahead and ordered hey cylinder works kit before I put the Piston in the cylinder would you recommend she put all around the piston and cylinder wall or do it dry thanks for the info
Richy
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Richy 5/15/2021 1:49am
5/15/2021 1:49am
Thisusernameisavailable wrote:
The oil rings on those are particularly fiddly. Did you fit genuine parts (I’ve had trouble with vertex in a 350..) I now only fit genuine...
The oil rings on those are particularly fiddly.

Did you fit genuine parts (I’ve had trouble with vertex in a 350..)

I now only fit genuine pistons in any KTM 4 stroke.

You know KTM use Vertex from the factory right, the OEM piston is Vertex?

Had one in a 350, installed properly, and no drama.
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T-Fish
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T-Fish 5/15/2021 2:37am
5/15/2021 2:37am
Thisusernameisavailable wrote:
The oil rings on those are particularly fiddly. Did you fit genuine parts (I’ve had trouble with vertex in a 350..) I now only fit genuine...
The oil rings on those are particularly fiddly.

Did you fit genuine parts (I’ve had trouble with vertex in a 350..)

I now only fit genuine pistons in any KTM 4 stroke.

Richy wrote:
You know KTM use Vertex from the factory right, the OEM piston is Vertex?

Had one in a 350, installed properly, and no drama.
Beat me to it.
MKMX
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MKMX 5/15/2021 3:23am
5/15/2021 3:23am Edited Date/Time 5/15/2021 3:26am
Thisusernameisavailable wrote:
The oil rings on those are particularly fiddly. Did you fit genuine parts (I’ve had trouble with vertex in a 350..) I now only fit genuine...
The oil rings on those are particularly fiddly.

Did you fit genuine parts (I’ve had trouble with vertex in a 350..)

I now only fit genuine pistons in any KTM 4 stroke.

Richy wrote:
You know KTM use Vertex from the factory right, the OEM piston is Vertex?

Had one in a 350, installed properly, and no drama.
T-Fish wrote:
Beat me to it.
CP Carrillo make all the 4 stroke pistons. Which is tied in with pankl.
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govolsdeep1983
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govolsdeep1983 5/15/2021 6:57pm
5/15/2021 6:57pm
Richy wrote:
You know KTM use Vertex from the factory right, the OEM piston is Vertex?

Had one in a 350, installed properly, and no drama.
T-Fish wrote:
Beat me to it.
MKMX wrote:
CP Carrillo make all the 4 stroke pistons. Which is tied in with pankl.
Thats what i though but my oe piston was a vertex also
govolsdeep1983
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govolsdeep1983 5/17/2021 2:50pm
5/17/2021 2:50pm
Just wanted to say thanks for everyones help after putting a cylinder works kit on it everything is golden
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526
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526 5/20/2021 12:19pm
5/20/2021 12:19pm
govolsdeep1983 wrote:
Just wanted to say thanks for everyones help after putting a cylinder works kit on it everything is golden
Did you find a smoking gun though?

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