Inky

<p>Hi Hugh, there are a few thing that could cause this sort if issue, one is an air leak leaning the mix down. Generally you would get a poor idle, poor pickup and soaring high revs with an air leak.</p>

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<p>An overly lean L screw can mess up your mid range pickup and it is easy to try turning it 1/4 turn anti clockwise.</p>

<p>Air leaks can be caused by split inlet boot, holed impulse line or bad crank seals.</p>

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<p>Lastly, the symptoms are close to those of a bad accelerator pump in the carb.</p>

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<p>If you get stuck, I can give you a price to sort it!</p>

<p>Cheers</p>

<p>Steve</p>