rev limiter on that motor should be 6200rpm. I ran a 1985 Johnson 120 on an 18ft action craft and had it raised as high as it would go with out a lwp. It spun a 14.5" x 24" raker at 6100. The boat ran in the low to mid 70's. I would raise it as high as you can go with the stock pick ups and run a 24 or 26, raker or chopper. Just my two pennies.

I am using a 24 Trophy Plus on my V-King with a stock 150 OMC, it is turning a bit high at 6,000 but hope to correct that soon with higher pitch Trophy (waiting to install a 27).

I have used the Trophy plus both submerged as surfaced and it does a great job across the board, even with hole shot.

Not sure if they make them though for the V-4 gearcase. If so, dont hesitate to try one out.

Larry S.

Still no luck with tach. New tach and voltage reg installed. Again its an Evinrude V4 140. Any help would be appreciated.

It also is part of the charging system but I have seen just the tach signal go bad, not common but I have seen it. If you have a volt tester there should be a small a/c current on the gray wire, I use a test light with a pos and a ground and it will make the bulb flash but you should see it on a volt meter as well.

Viper, thanks again... If it is the voltage reg what else would be an indication the regulator is bad?

v-king that sounds right 5000-5500 or you could just keep cranking on it till the limiters kick in.

There is a tag on my motor showing the max rpm to be 5500 and max HP at 5000. Viper, thanks for the info. The gray wire comes off the control box below the key at the same spot the temp sending wire enters.. Does that sound right?

77viper wrote:As far as your tach there should be a purple wire to power a black to ground and a gray to the signal post. It could be your voltage regulator is bad the tach signal comes out of that. It's on the tpo of the block between the cyl.

Viper, any idea what max rpm would be on that motor???

As far as your tach there should be a purple wire to power a black to ground and a gray to the signal post. It could be your voltage regulator is bad the tach signal comes out of that. It's on the tpo of the block between the cyl.

Ya gotta start with current rpm's The OMC'c and Mercs are different beasts. As far as the wiring for the tach, maybe someone can chime in that knows OMC's. Once you know the max rpm rating of the motor and rpm's at wot, should be able to make a judgement call on a prop.
Rick.