1989mc18r5k wrote:not believed to be problem the mc16 cases...they had undergone preparation before entering the crankshaft upward ... the air correction plumbing is like a stock mc21 and i use mc21 factory settings in the mc18 carbs except the mc18 Emulsion tubes and main jets...
all i want is the power of a completely stock mc21(45hp) i beleve that i can achieve it with my stuff.
thank you again!
Fit 21 emulsion tubes or solder up two of the 4 rows of holes.
MC18 carbs are different to 21 carbs internally. They have an additional air orifice which may be your problem, and that may need to be blocked up when used with the 21 emulsion tubes.