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2011 Yzf450 starting issues

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I recently bought a '11 model yzf450 with a genuine 14hrs (came with power tuner), and since swapping the stock exhaust to a full yoshimura system I have only managed to start it twice (both straight after exhaust swap) and now I can't get it to start at all.

I have checked all electrical connections, and cleaned them with electrical cleaner to make sure, put a clean air filter in (old one was a little dusty) spark plug is good, fuel line is good, fuel filter is good, power tuner doesn't show any errors. Bloody thing just WON'T START!!!

Even rang 2 different local yamaha dealers and they have no idea what it could be.

If anyone has any thoughts please share them, I just want to go riding....

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