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Discussion Starter #1
Hey I have Sx 65 2017
The bike burning spark plug I put new spark plug after an hour he burned The brand of the spark plug ngk lr8b . And I'm me using 2% oil
The engine Did Only 41 hours.
Thank you for your help
 

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Dirt Wizard
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Welcome to the forum, I just moved your post to a better area where you will probably get more responses.
Can you post up a picture of the buggered plug so we can have a look at the burn?
 

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Yes, a picture of plug would be good.

2% (50:1) oil ratio is good. Just make sure you use good quality 2 stroke oil.

Is the 41 hours of use since the bike was new? Has the bike had a new piston at any time in those 41 hours?
 

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We have been riding 2 stroke KTM's now for 12 years. As you go on you tend to learn stuff, and we have learnt that to keep the engines crisp they need new pistons and rings. Top riders fit new pistons at 12 hour of use. We feel that only 12 hours for a piston is a fraction short for us. So we do them at 40 hours and at 20 hours we fit a new ring.

Your spark plug does not look too bad. But perhaps fit a higher temp rated plug. This normally seems to sort the problem.
 
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