I have a 1776 w/ dual Kadrons, 009& Pertronics ignition ... at
3000-3200 RPM's the carbs bacfire, especially when cold. It is not a major backfire, however the engine seems to be starving for gas. If I push down on the accelerator and get above this RPM range it stops. Any suggestions where to start?
Paul, What you are describing is pretty much a standard condition with Kadrons and an 009 distributer. A cold engine is an automatic lean condition. Fuel(gas) will condense out of the fuel/air mix and cling to the sides of the manifolds creating a lean condition. Questions, first. Are you using aluminum or steel manifolds? Aluminum manifolds will transfer heat fron the cylinder heads to them selves quicker than steel and give you a better mixture; remember the heat risers on a stock carb manifold? Are the carbs in good shape? Are the throttle shafts tight in the bushings? An air leak here will also give a lean condition. The 009 diizzy is also advancing too fast to give you a good burn. Contact me (off NG), John C at aircooled.net, or A.J. Sims at lowbugget.com to drill one of your carbs for a vacuum port and use a SVDA(single vacuum dual advance) dizzy. In the meantime, do what I do; keep your foot out of it untill it warms up.
El Paso Bob
71 1776 Baja w/dual Kads and vac dizzy 21.9 MPG around townMotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.