A Better Carburetor?

A BETTER CARBURETOR?

FULL INJECTION MAY BE THE wave of the future, but there's life left in carburetors yet. Yoshimura's "Multi Pull-Jet System" is one example, meant to provide some of the benefits of fuel injection without the complication and expense.

The system, which incorporates ideas that have been around for years, uses a standard carburetor body equipped with a thin tube in place of the standard needle. The tube contains 16 tiny holes, and the more the tube is lifted (just as the needle in a standard carb is lifted when the throttle is opened) more of the holes are exposed. Instead of fuel entering the intake tract via a jet uncovered by the rising needle, it enters through the holes in the tube, more of which are re-

vealed as more of the tube is exposed through throttle travel. The theory is that the system should lead to better fuel atomization, and thus more complete and efficient combustion-one of the primary benefits of fuel injection.

Dyno testing of engines using carburetors equipped with the system shows increases of 2 to 3 horsepower across an engine’s entire rev range, according to Suehiro “Nabe” Watanabe, vice president of Yoshimura R&D of America. Watanabe says the Yosh race team has used the new system, developed and manufactured in conjunction with Mikuni, for the last six months, and within the next six months will offer conversion kits to its customers. No price is available yet.

Yasushi Ichikawa