Timing adjustment on 92 70 hp Force

[5string]

I read that you need to install the proper test prop to check WOT timing, would it work to just tie off to the dock and do a quick check with the regular prop? Also, to check static timing it says remove prop and use spark plug testers, would it hurt anything to just pull the plug wires completely off and check static timing?

5string

 

[pnwboat]

Re: Timing adjustment on 92 70 hp Force

Tying off at a dock and going to WOT is not a very safe. If a cleat were to let go, or the rope break, who knows what will happen. Even cruising out on the lake and going WOT to check timing is not safe either. You may hit a wake/wave and get thrown into the spinning flywheel.

For static checking, the reason they say to use a spark tester, is to prevent damage to the switch box or CD units. You have to discharge the spark that is being generated. Just disconnecting the plug wires and leaving them dangling while cranking the motor may cause damage. You have to either hook up a spark checker, or ground the spark plug wires. They say to remove the prop probably to prevent accidental injury from the spinning prop. I just make sure I'm not close to the prop, or keep anyone around away.

 

[jerryjerry05]

Re: Timing adjustment on 92 70 hp Force

You can't get a good WOT tied off at the dock.Damage to the packs might happen.J

 

[5string]

Re: Timing adjustment on 92 70 hp Force

What about putting on a test prop, what is that all about? Is it because running wot it can displace the water in a test tank? I mean can I just put it in a tank and keep it hooked to my truck and do the test with the regular prop? I can't imagine running it more than 30 or 40 seconds at wot to get a reading.

5string

 

[F.O.R.C.E.]

Re: Timing adjustment on 92 70 hp Force

I,m trying to figure this out too.
If you use a tank , it would have to be very large or a special design to keep the prop from blowing all the water out http://www.specialtymotorsmfg.com/outboard_testtanks.htm
Test props or test wheels are designed to put a load on the motor , but are fairly costly, and in my case hard to find.
Good luck and tell us how you do.

 

[Frank Acampora]

Re: Timing adjustment on 92 70 hp Force

Just leave it on the trailer with the tie-downs left attached. Dunk it at the ramp when there is no traffic set the emenrgency brake hard, and fire it up. At 3/4 to full throttle, timing will not change with load. So run it full throttle on the trailer and check your timing--that couple of seconds needed will not hurt anythin unless your ramp has loose mud that will be stirred up and sucked into the water pump.

A test wheel is a special wheel shaped device that fits in place of a prop. It is sized for a specific horsepower engine, just like a prop. The internal spokes or vanes displace water to the rim while running and do not throw it back as a prop does. This still loads the engine as if it were running on the water.