Testing for fuel to cylinders

[Capcor38]

After blowing a hole in engine number one, cylinder #1, I have no intention of throwing another engine away.I have a completely rebuilt 1988 90 HP VRO with the oil pump disabled (pre-mixed fuel in tank). Having gone through one engine already, I am looking for advice to ensure that I have fuel at all cylinders. Do wet plugs mean I have good fuel delivery when firing without sparkplug wires connected? Cylinder #1 would appear to have a dry plug while the others are wet. It was a 6,000.00 dollar mistake the last time and do not want the inconvenience again. Suggestions?

 

[wilde1j]

Re: Testing for fuel to cylinders

If the cause of the first failure wasn't nailed and corrected, I can guarantee it will happen again. Were the carbs cleaned by soaking and rebuilt?

 

[Capcor38]

Re: Testing for fuel to cylinders

Blew the first motor and tossed it. The new one is completely rebuilt top to bottom. Just don't want to end up with the same problem as the last time.

Besides rebuilding carbs, etc. is there a surefire way to know if fuel is getting to all cylinders? Have heard that wet plugs does not always tell the tale.

 

[wilde1j]

Re: Testing for fuel to cylinders

First, what did rebuilder tell you was the cause of one hole failing (if they told you VRO, I wouldn't believe it ... the oiling doesn't discriminate by cylinder)?

When idling if you pull the plug boots off one at a time using special insulated pliers for the task, do you get a big RPM drop for every cylinder?

Does motor turn 5500 to 6000 RPM @ WOT?

Does spraying premix into each carb throat, one at a time, result in a significant RPM gain?

If question was "the VRO did it", I would just rebuild the carbs, after eliminating any possible air leaks in the crankcase as another possible lean cause (upper and lower crank seals, etc.)

Did any parts from the old motor (carbs) end up on the rebuilt?