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have a 1977 tnt everest w/ 399 twin want to get an adapter to switch from a tilliston hr carb to a mikuni any info would be great thanks.
 

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have a 1977 tnt everest w/ 399 twin want to get an adapter to switch from a tilliston hr carb to a mikuni any info would be great thanks.[/b]
If you switch to aMikuni, you'll also need to install a fuel pump on the sled. Tillotson pumps are part of the carb, Mik's aren't.
 

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have a 1977 tnt everest w/ 399 twin want to get an adapter to switch from a tilliston hr carb to a mikuni any info would be great thanks.[/b]
You'll need an adapter to fit the mikuni to the tillotson bolt spacing on the manifold. You'll need a fuel pump, and different throttle and choke cables to fit the mic. You'll need a large assortment of jets, a box of spark plugs, and several hours of spare time to dial it in. Dennis Kirk should have everything. Why change?
 
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