2005 ktm exc ''no power problems'' Help please

no1keene · 04-29-2010, 03:33 PM

Hi huys i have a 2005 ktm exc and i have no power problem. I have checked loads of the basic things. The bike starts and runs perfect but just has no power. It was running fine until 2 days ago. Can any of you bike wiz kids shine any light on this please. Any help greatly appreicated.

no1keene · 04-29-2010, 04:08 PM

anyone???

bajadog · 04-30-2010, 08:29 AM

How about some more info?

What is it 4 stroke 2 stroke, displacement?

Reason for asking is that every country has different models not
available in other countries.

no1keene · 04-30-2010, 12:38 PM

Hi, thanks for your help, its the 2 stroke model.

bajadog · 04-30-2010, 02:01 PM

A few things to check:

Air filter clean?

What color is the plug?

Did you change oil ratio/gas type (old)?

Have you check for vacuum leaks around the carb (engine at idle with WD40)?

no1keene · 04-30-2010, 03:36 PM

Quote:

Originally Posted by bajadog

A few things to check:

Air filter clean?

What color is the plug?

Did you change oil ratio/gas type (old)?

Have you check for vacuum leaks around the carb (engine at idle with WD40)?

Yes changed air filter. Plug is normal. Oil gas is perfect.
I never checked for vacuum leaks etc. Please explain the WD40 method.
Thanks for ur help bajadog

bajadog · 05-01-2010, 12:50 PM

Start up the bike, let it warm up a bit.
Spray WD40 around the carb both sides of the carb boots.
If the RPMs increase, you have a vacuum leak.

Good luck.

BTW, some one told this method on Thumper talk but said
to use starting fluid. Big scary no no.

no1keene · 05-01-2010, 02:28 PM

Hi bajadog. Tried that but no good. Anymore suggestions??

bajadog · 05-02-2010, 09:50 AM

How about a compression test?

If I remember right, your should have ~170 psi in most two strokes.

rleontiev · 10-07-2010, 03:14 PM

Quote:

Originally Posted by bajadog

Start up the bike, let it warm up a bit.
Spray WD40 around the carb both sides of the carb boots.
If the RPMs increase, you have a vacuum leak.

Good luck.

BTW, some one told this method on Thumper talk but said
to use starting fluid. Big scary no no.

RPM's increase? I have always found RPM's to decrease because the vacuum leak is temporarily "sealed" by the WD40 until it gets sucked into the leak. Is this correct?