Posts
850
Joined
2/19/2015
Location
Los Angeles, CA
US
Edited Date/Time
6/5/2015 5:53am
Alright, so I ordered a wiseco top end kit on eBay from this company called "apex*racing" for my '14 250sx, but now I'm not sure if I got sent a kit for the wrong year or not because this is my first KTM.. I first noticed that the piston is a one ring model. I did a little searching on this and found that this was stock for 250sx's sometime around '05 I think? And the stock piston I pulled out of my bike was a regular two ring. I was just thinking it was the one ring model and would still be alright to use.. The point where I started questioning whether I got the right kit or not came up when I opened up the gasket kit and didn't see any o-rings for the power valve and the gaskets for the PV covers didn't match at all.
Here's some pictures of what all I got:
The base gasket fits, but the outer o ring for the head was as big as the entire diameter of the top of the cylinder and I couldn't make it fit on there at all.
And another thing that's adding to the confusion is the labeling on the boxes.. The model years on the box for the piston say 03-15 for the SX, but the box that holds everything has "2003-200" with the last number cut off.
So, obviously I either got the wrong gasket set or the entire kit is the wrong year, I have no idea. If someone could clear this up for me I'd really appreciate it so I can contact the company and see if I can do some returning/swapping. If the piston is good, I'll keep it and use it, but I definitely need the correct gasket set because the one I have now is not right at all.
Here's some pictures of what all I got:
The base gasket fits, but the outer o ring for the head was as big as the entire diameter of the top of the cylinder and I couldn't make it fit on there at all.
And another thing that's adding to the confusion is the labeling on the boxes.. The model years on the box for the piston say 03-15 for the SX, but the box that holds everything has "2003-200" with the last number cut off.
So, obviously I either got the wrong gasket set or the entire kit is the wrong year, I have no idea. If someone could clear this up for me I'd really appreciate it so I can contact the company and see if I can do some returning/swapping. If the piston is good, I'll keep it and use it, but I definitely need the correct gasket set because the one I have now is not right at all.
That kit looks like it is from 03-05 looking at those PV gaskets although the motor was relatively the same from 03 to current. Do yourself a favor, send that single ring piece of junk back because it'll wear out in half the time!
Ktm part number for the kit you will be looking for is : 00050000011 (1) ! Retail for that kit is $233.99, and I'm sure you can find it much cheaper online! Just remember, stock is trick!
And if you do decide to keep that kit, make sure you measure the ring end gap before you install it. And expect to replace the ring in about half the time you normally would simply because it is a single ring! It will rev quicker, but wear out quicker as well..
Johnboy
The Shop
-The model year on the box probably meant to say: 2003-2008. I know the engine has basically been the same since 2003 but for some reason a lot of parts are split up between 2003-2008 and 2009-2015.
-I would not trust Wiseco pistons on my bike. I had HUGE problems with them in my previous KTM. The measurement for their "A" size piston was way off, and was close to a C-size in Vertex pistons. The added compression lead to extreme detonation which melted the spark plug tip and destroyed 2 cylinder head. Fun times. KTM OEM pistons are actually Vertex, but they will cost $20-$30 more if you want them in an orange box instead of the grey (Vertex) one
And about wiseco, that really blows that you had all of those problems! I like going with wiseco because their pistons are forged and pretty much can't be shattered and last longer. But maybe if I get my money back instead of a swap like I was going to do when I realized I got the wrong kit originally, I'll look into the vertex kit. I bought my bike used and it was a demo bike, so the stock piston was in there for all this time and it seemed to hold up well.
Since I've learned a big portion of what I know about bikes from forums and searching threads, might as well leave a little advice to anyone with a 250sx close to the 2014 model that's looking for info about pistons: The correct code for the piston kit you need if you're going to order from Wiseco is PK1883 (racer's choice is PK1884), the gasket kit is W6622, and the top end bearing has been the same for a long time and is B1037. And QUADRUPLE CHECK BEFORE ORDERING IMPORTANT ENGINE PARTS ON EBAY.
I can list (dis)advantages for both cast and forged but I don't see the point. All I'll say is I had a Wiseco size A (stamped on the piston), that was almost 2 sizes larger than what it should have been.
Also, I'm talking strictly 2-strokes. I have zero experience with anything 4-stroke related.
Pit Row
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