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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Posted on Jan 02, 2017

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Hi,
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....
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Hope that helps you out!

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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.

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Look at ?

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1 Answer

Mis fire at mid range


Hi,

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.

Cheers

Jon

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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

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