nsr125 breadown any ideas

[adamsewell]

got a little crack on my exhaust near the manifold and rode it tonight and spluttered its tits off and rev counter was flickerin like mad would not let me go over 25mph then just cut gradually out and now not firing up at all any ideas wot you guys think ??

many thanks
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A . Sewell

[Jayy]

I'm not a mechanic or know allot about engines but when I had my RS125 I had a similar problem and it did pretty much what you just described.

Truned out the catalyst had come loose inside the exhaust and was getting sucked back into the engine an basically fucked the barrel and piston.

[adamsewell]

thats what my mate basically said might be piston or cracked a ring
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A . Sewell

[adamsewell]

i been also told to change spark plug as it could overheat it done this because cheapest version first and no spark any ideas?
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A . Sewell

[That_Hornet]

Try the workshop section