REBUILDING 2004 KTM 125sx engine
Posted February 27, 2010 - 09:47 PM
What I want to ask of you is whether or not I should try to tackle this job myself because I'm worried about the complexity of the bottom end and whether or not I can do a high quality job. If I should, what kit is the highest quality/most recommended?
If you recommend I not do it this time around does anybody know reliable rebuilder around the Tulsa, OK area?
Posted February 28, 2010 - 07:12 AM
Search "top end" in this forum and you should find one of my pictorial threads on my top end rebuild. My PV pictorial is in the FAQ, that should help you with that.
Moose makes a good gasket kit. Any of the top brand piston kits will work well. Vertex, Weisco, Wossner.
I am on my second Weisco, 200+ hrs on the first.
Posted February 28, 2010 - 09:37 AM
What is involved in a bottom end rebuild? Things such as crankshaft bearing?
Posted February 28, 2010 - 10:57 AM
Posted February 28, 2010 - 11:01 AM
Posted February 28, 2010 - 03:53 PM
BTW I plan on doing mostly trail riding but maybe try to enter a couple motorcross events and see how I like it.
Posted February 28, 2010 - 05:05 PM
Posted March 01, 2010 - 10:58 AM
Posted March 01, 2010 - 12:01 PM
Posted March 01, 2010 - 07:08 PM
Posted March 02, 2010 - 07:52 AM
Posted March 02, 2010 - 08:15 AM
What did you pay for your 04 ktm? I"m looking at buying an 04 125sx atm.
I paid $1400 for mine last May. I think I got a great deal.
Posted March 02, 2010 - 10:24 AM
Also I have a brand new SXS head with the three inserts for this bike if you are interested.
Im sorry I should have said we lost the lower rod bearing.
Edited by Tom_Kramer, March 04, 2010 - 04:44 PM.
Posted March 02, 2010 - 11:35 AM
KTM sizes their cylinders after they are produced, a number I or number II, they sell pistons to match. These are only a few thousands off. It is common proceedure to use a number II piston in a number I cyl after the first piston is worn out. This makes the piston tight in the bore again. Its OK to do this cuz they are so close anyway and the number I is now worn nice n smooth and a liitle larger. So it may be a similar issue with the Weisco, tho I didnt look at your link.
My cylinder is a #1, I installed a #2 piston, which are what all the Weisco's are I believe, or what I was told, that are 64mm. My ring gap was perfect.
Posted March 02, 2010 - 07:51 PM
Posted March 03, 2010 - 09:15 AM