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Anyone Good With Carbs? (Mikuni Vm26-8074 Carb)

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Have previously posted a topic asking about the possible setup for a Mikuni carb. fitted to a 1982 Montesa Cota 349.

On further investigation I am more confused than ever!

It seems that the original spec for this carb. would have included a 5F21 needle and a 2.0 slide.

The setup on my bike has a 5F3 needle with a 2.5 slide.

Has anyone the knowhow to tell me what the effect of this change will have to the fuelling on my Montesa?

All help much appreciated.

its almost impossible to tune a carb on the internet.

Birkett rode montesas and hes not far from you, support your local dealer?

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