Misfiring problem *SOLVED*

[BoYSiE]

Hi, i have recently put a bore kit in my ped, and when it pulls away in the high revs it seems to misfire, also, when im flat out it starts to misfire, its only when i hit 10k+ Rpm, below that its fine. It said in my bore kit manual to use a longer threaded spark plug? which i havent done, could this be the solution?
Thanks.

[pipnet11]

Try it. If you bugger about with timing and things only to find out its a simple plug problem you'll be kicking yourself. Plugs dont cost much, and are a doddle to change, it would be the first thing Id try.
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I love the girls that do, I hate the girls that dont, I hate the girls who say they will and then they say they wont, but the girl I like most of all and I think youll say Im right, is the girl who says she never has but looks as though she might. - Max Bygraves

[stinkwheel]

Using a longer or shorter threaded plug in a small engine will significantly alter the compression ratio. Two strokes are a delicate balance of pressures so I would try the longer plug in. This will bump up the compression ratio. Take the plug out after a few miles and 'read' the colour according to the following guide:

https://www.bikechatforums.com/viewtopic.php?t=37506
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[BoYSiE]

Ok, i thought i would post my results, i bought a hotter spark plug (racing spark plug) and now i no longer have misfiring at high revs.
Jon.