Ktm 200 no power after top end rebuild. Help please.

[timmah666]

Hi guys as the title says I took my bike to the mechanic and he done a top end rebuild on it. He told me to take it easy on the bike for a full tank or so after that itl be sweet. So today I've done the full tank and it still runs like crap, feels like it has almost no powerband. Defiantly can't pop any wheelies on it now either bugger all power. Not coughing or spluttering, it runs smooth but just no strong hit of powerband like it had before the rebuild.

So I guess my question here is, is this normal? And if so how long do you normally take to run in a 2 stroke after a new top end? Thanks in advance for any advice!! ?

[gimped up]

Power valve issue.

[timmah666]

Ok so this is %100 not normal for the bike after a rebuild? It should still hammer into powerband even with a fresh top end just put in? Thanks!

[Beau 88]

Ok so this is %100 not normal for the bike after a rebuild? It should still hammer into powerband even with a fresh top end just put in? Thanks!

No it's not like ridngslikecrack said the power valve may be stuck or improperly installed . 

[timmah666]

It's a public holiday weekend so I can't take the bike back to the mechanic for 4 days. And I was looking forward to riding this long weekend. So is this something I can just fix myself? Or should I wait and just go to the mechanic?

[Beau 88]

It's a public holiday weekend so I can't take the bike back to the mechanic for 4 days. And I was looking forward to riding this long weekend. So is this something I can just fix myself? Or should I wait and just go to the mechanic?

you can pull the pipe off and feel inside the exhaust port to see if it's stuck , i remove mine and clean them every 20 hrs. or so on my honda , easy to do but idk about the ktm . Sometimes if they have not been cleaned in a while if you push the rod that goes through the valves to one side the carbon buildup will make them stick . This should have been completely torn down and cleaned with new seals while the top end was serviced , some people do it some don't bother. 

[gimped up]

What year 200?

[Mike in OK]

Power valve.

[Still Bill]

I must admit that once on my year 2000 200EXC I did not get the push rod from the case into the slot in the PV rod when I installed the cylinder.    It behaved exactly like you describe.

 

If you paid to get it fixed, I would not ride it anymore or take it apart until you take it back to get fixed right.

[peaceofwork]

this is easy, on the right side of your cylinder their is an inspection cover held on by 2 bolts remove it start the bike have a light handy, while looking in the hole rev the bike and watch for movement you should see some lines come together to make a continued line.

you might see the pv  arm that comes up from the lower case is not hooked to the receving upside down u of your upper lincage  if that's the case lift the cylinder and try again to locate it but clean I if it has not been done.

 check utube or ktm talk, if your mec didn't clean the pv find a new guy

[Mike in Fresno]

look in the FAQ and see the how to do it there

[timmah666]

Ok so it's defiantly the power valve? It's a 2009 model btw. Ill have abit of a look today if its an easy fix ill try it. If not ill just have to wait and take it back to the mechanic.

[peaceofwork]

666 did you get it? I forgot to mention sometimes guys over tighten the side tension on the flapper-from just fealing contact back it out as it all expands when it gets warm

[KTMRider4Life]

666 did you get it? I forgot to mention sometimes guys over tighten the side tension on the flapper-from just fealing contact back it out as it all expands when it gets warm

Your pm's are full POW. Clear some out buddy!

[timmah666]

Yep problem solved. The side tension bolts were to tight. Thanks heaps guys!

[peaceofwork]

crap you better hurrey up and go riding the weekend is about over sorrey I was slow on the over tight bolts thing...

squid I'll get on that tonight

[Mike in Fresno]

for the flapper axles-not side tension bolts-they should be adjusted with the head off. You look in the top of the cylinder and center the flapper in the port with the axle adjustments. Then back it off a little so it doesnt bind.