Chris Wilson
Cadet
- Joined
- Jul 7, 2002
- Messages
- 20
We are in the process of breaking in a requilt powerhead and, although the engine is performing well so far at low speeds, I am concerned that a lean fuel mixture on my upper carb may have contributerd to the failure of the original head.<br /><br />We used to have a VRO (the other thing we suspect might have caused the failure) but have bypassed it and are mixing the oil into the fuel (currently 25:1 for for 12 gal for the breakin). <br /><br />However, in some earlier forum responses I received, a number of you indicated that one carb running lean could have caused one of the cylinders to wear out or fail prematurely. There was also metal missing on the edge of the piston.<br /><br />If this is symptomatic of a lean mixture I assume this means that one carb is not carrying its weight and therfore causing excessive wear and incorrect ignition for the cylinder it supports.<br /><br />Anyway, how does one go about determining that the fuel/air proportions provided by two carburators are the same over the same RPM range?<br /><br />Hope you can help.