Edward R. Cozzi

Sounds more and more like the slower engine is down on power. Pull the plugs and do a compression and leak-down test. Could be something as little as a broken valve spring.

Turbojack

Once you done this & all checks out OK, then next place to look is ignition

Carder

thanks for the suggestions, I was also wondering if it could be a fuel delivery problem,.. pinched line, carb jets, fuel pump,
whatever. Carder

Turbojack

Might be fuel but you are saying problem is even down low. That does not sound like fuel to me. Most times if it is fuel it is in the upper rpms (4000+) But I have seen stranger things. It sounds to me like you are only running on 7 instead of 8

JJONES

check plug wires,#5and #7, can be crossed and not very noticeable until under a load,also check your total advance1

satisfactionII

contact the engine builder before you do something you shouldn't.

Carder

Thanks for the suggestions... 3 brand new plugs were fouled on stbd side. rechecked advance: 35 degrees as set.
checked carbs: both jetted as dynoed.
fuel volume was also equal on each engine.
fine tuned the throttle adjustments, put in new plugs and now it runs within 100 rpms of each other... who knows how accurate the gauges are.
Anywho...I am back terrorizing Saginaw Bay as of tomorrow.
Carder

Edward R. Cozzi

Most tachometer manufacturers claim that their tachs are accurate + or - 150 rpms. A photo tach will tell you how you're doing.

I'd say three fouled spark plugs would definitely make that engine down on power. Did you find the cause of the fouling? Did you take a compression test?

Carder

NO. and now the alarms are going off as soon as it gets warmed up.. no pressure issues or heat issues on the gauges, the resevoirs are full enough. I cant boat due to the incessant alarm noise that is ongoing after the engines have been run for 15 minutes.

Edward R. Cozzi

Are the alarms going off on BOTH engines?