Question about 2001 KTM SX 250

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As soon as my bike goes to hit powerband it falls on its face ive cleaned carb 3 times cleaned airfilters checked reeds and intake cleaned the whole twin power valve i have an 01 ktm 250sx

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Have you tried the plug and carby setting .. i have a similar issue but cannot tune the carby correct

Posted on Aug 19, 2011


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1 Answer

Why is my bike running lean? I have a 99 FXSTS, running 2into1 V&H, EV27 cam, K&N Airfilter. I changed the intake manifold gaskets, cleaned the carb, checked diaphragm for wholes and float level,...

Try going up a few sizes on the main jets. Because you now have a more free flowing exhaust and more air flow thru the intake with the K&N. It needs to be rejetted.

Aug 08, 2017 | Harley Davidson 1999 Harley Davidson...

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Hello i have a aprillia sr50 and i brought it from brand new i ran the bike in for 300 miles and then i fully de-restricted the bike and placed a de-restricted exhaust on and a bigger jet and had the...

That looks like a REED VALVE leak.
If your 2 stroke kept coming out from the carb air intake and as you say that sometimes a back fire in the exhaust.

Check these....
  • Reed valve
  • Crank oil seal ( there might be air leak in the block )
  • Exhaust pipe ( might be already blocked )

Hope that helps you out!

Aug 29, 2011 | 2011 Aprilia SR 50 R Factory

1 Answer

Bike will not idle. tried adjusting carb but makes no difference. thought there may be water in the fuel so have tried winns dryfuel - no change so far.

Not Idling there are multiple reasons not only carb.
1, Improper Timming 2, Compression leak 3, Bad spark-plug 4, chocked Airfilter.
clean the spark plug and check the firing clean or replace airfilter check timing check for leaking gasket in cylinder and cylinder head check valve seal check all these as I mentioned order it will help.

May 02, 2011 | 2007 Yamaha XT 125 R

3 Answers

Bike boggs down no powerband rm 250

i have a 92 rm 250 an i just had it fully rebuilt an it laggs in power band an splutters an feels guttles

Oct 09, 2009 | 2003 Suzuki RM 250

2 Answers

Ktm 200sx not running right

Is your power valve clean, and moves freely? And don't forget to make sure the air filter is squeaky clean. How does the plug color look?

Aug 09, 2009 | 2003 KTM SX 250

1 Answer

Hello, I have a YZ 80 and i was wondering why my

Look at ?

crank seal (drawing air)

ring wear

main jet (blocked jet's)

fuel starved carb

Jul 15, 2009 | 2003 Yamaha YZ 125

2 Answers

My 2000 KX100 sputters real bad

check your power valve could not be workong

Mar 31, 2009 | 2003 kawasaki KX 125

1 Answer

Mis fire at mid range


I would like a little more detail as to the problem, but here are a few things for you to check.
1. Check the spark plug for a good blue/white spark. The gap should be 0.7mm.
2. Is the jetting correct ? and inspect the position of the needle ( In which groove is the clip. 1 being the top and 5 the bottom).
3. I am presuming that the carb has been cleaned !
4. LONG SHOT ! Is the bike using gear oil?
5. Lastly check the condition of the reed valves.



Mar 09, 2009 | 2002 Honda CR 125 R

2 Answers

Kx 125 1992 wont start

sounds like the rings are fried and needs a new piston and rings.. for an 80 there about 110 bucks for the whole kit

Feb 17, 2009 | 2003 kawasaki KX 125

1 Answer

The motor runs but wont powerband? (yz250)

clean out the entire airbox along with really clean out the air filter, use gas to clean the filter then rinse it out with warm water.iv been doing it for years, dont let anyone tell u otherwise, check the reeds, replace if needed, clean the powervalve. clean the carb. i dont no wat else could be a matter with the bike, unless its in the cylinder like no compression of broken or worn piston rings, who noes. get curious check **** out that away u dont have to waste ur time askin us. u no

Jan 25, 2009 | 2003 Yamaha YZ 250

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