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tope end replacement
Posted: 01:25 pm Apr 24 2008
by midlifemoto
when or what are the tell tale signs this needs to be done? I have a 2006 KDX 200 with about a dozen outings on it. It runs strong but perhaps just a tad off from when I got it. Do you do a compression test? On it's first top end is it usually just rings? I know there's no one easy answer as there are many variables...just trying to get a consensus on when ya'll decided to do your first top end and what led to that decision. thanks!
Posted: 01:30 pm Apr 24 2008
by Indawoods
Wait about 4 years then ask again...
Posted: 02:07 pm Apr 24 2008
by midlifemoto
are they really that durable?
Posted: 02:24 pm Apr 24 2008
by Indawoods
Yes....
Posted: 02:30 pm Apr 24 2008
by 2001kdx
Depends on the rider. The weekend warrior might go 4 years, and the avid woods racer might go just one season. Where are you at?
Posted: 03:03 pm Apr 24 2008
by midlifemoto
I run that bike pretty hard in wide open areas...not much tight techno chuggin' along
Posted: 03:04 pm Apr 24 2008
by scheckaet
2006 KDX 200 with about a dozen outings on it
That's really nothing as long as your jetting is somewhat close to correct
Posted: 03:23 pm Apr 24 2008
by midlifemoto
ok, thanks...I treat it like a cheap prom date...rode hard and put away wet....most of my riding is of the motocross nature, but I'm sure after hearing from folks that I can get thru 2009 season at least before putting new rings in it
Posted: 05:05 pm Apr 24 2008
by Jeb
If you run it hard and often you might consider replacing the rings every season . . . gives you a chance to check tolerances and keep the KIPs in good shape.
Posted: 09:14 pm Apr 24 2008
by Mr. Wibbens
I last did my top end in 2003
It still pulls all 275lbs of me (without gear) up anything little Carvr can go up!
Posted: 10:54 pm Apr 24 2008
by skipro3
That is true! I've seen him without gear. And Carvr is little.
Posted: 10:58 pm Apr 24 2008
by Mr. Wibbens
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skipro3 wrote:That is true! I've seen him without gear. And Carvr is little.
Come to think of it you prolly seen my GEAR!
Posted: 08:43 am Apr 25 2008
by kicknrocks
I might be mistaken, but doesn't midlife want to get the grenade out of there?
Posted: 08:59 am Apr 25 2008
by Indawoods
That's only 220's.... he has a 200.
Posted: 09:12 am Apr 26 2008
by Cturbo
I used to check for compresion and after 12 years waiting for a change I open up the top end. Everything was within specifications but I put a new Wiseco anyway. I gained a little bottom end probably because the Wiseco is lighter.
Posted: 09:47 am Apr 27 2008
by skipro3
I honestly think most trail bike riders change out their pistons/rings way too often, more than necessary. These motors are either designed for the MX world, which we are never going to abuse a motor like, or they are way over built for the riding style, which the KDX motor is for sure. I think it's much more likely to wear the cylinder lining away before the piston is shot.
I pull my pipe and look up in the exhaust port to examine the side of the piston and the back of the cylinder. If they show any wear, I tear down the top end. If they look good, then probably the whole piston and bore are going to look good. Just what I do........