Rochester 4 bbl, hesitating at WOT

[Evinrude Boater]

Re: Rochester 4 bbl, hesitating at WOT

Sometimes the timing being off a hair will cause a little pop.. A vacuum gauge will tell you alot about a sick engine

The gas line is fixed. Warmed it up and checked the timing at an idle; it was about 6 degrees before TDC, supposed to be 8. I guess it's a place to start adjusting.

 

[Evinrude Boater]

Re: Rochester 4 bbl, hesitating at WOT

Maybe the spring tension is too high? Mine was at one time and the butterflies would not open full and I had popping at WOT. So at WOT I pushed the butterflies to full open and the popping went away and RPMs went up to specs. Lowered tension on spring which is on the starboard side of carb.

I measured the force required to open the secondaries and it was bang on spec, 40 grams.