November 28, 20169 yr Hi I have a bantam - b175 engine running mikuni carb and electrex world ignition. Starts ok, bottom end is not bad (a little boggy), but the main problem is overrun. Open the throttle and Revs out but when the throttle is shut takes a good 3-4 seconds to drop revs to Tickover - but will Tickover ok. Any thoughts Cheers John
November 28, 20169 yr Author Definitely no leaks from manifold ! Although I may try without the manifold to confirm any theory Cheers John
November 28, 20169 yr Looks like its missing gaskets between the manifold faces, or have you used instant gasket?
November 28, 20169 yr either way bantams are notorious for jetting up a carb.. why did you choose that piece of japenses engineering???
November 28, 20169 yr Sounds like an air leak and ours runs best with an Amal carb. The Mikuni always worked well at one end or other of throttle opening. Added advantage of Amal is you can then run in British bike events !!
November 28, 20169 yr Author The engine came with the mikuni hence used it . I may try without the manifold spacer just to check airl leaks Cheers John
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