I?ve got an Evinrude 140 HP motor I believe to be a 1978 Model but the only number I can find on it is a serial number of: J0002876 I?ve looked all over for a model number but can?t find anything else. It?s the greenish/gold color from top to bottom and a white base decal on the cowling with a red, bark blue and royal blue stripe around it. It also has one of these stripes just above the cavitation plate. It has the inboard power trim vs. the older style that has the hydraulic motor outside the transom frame mount. It also has the "bubble back" exhaust manifold. Any input?
I would also like to know whether the HP on a motor of this vintage is rated from the prop or the engine. If so, what is the difference? Is this a strong motor or one on the weaker side?
I?ve got it on a 22 foot tri-toon pontoon boat with lifting strakes on all three tubes and I?m not satisfied with the top speed of about 30mph with an RPM of 5100 ? 5400 unloaded and a four blade prop from Power-Tech. Outside of the motor being a bit weaker because of age, would a newer 150 HP such as a mid 90?s Fast Strike make enough difference to justify replacing it?
I?ve got a power head for this motor that the previous owner changed out back in the 80?s and I was wondering about building it up with a bit more HP? Is this easily done or am I asking for trouble?
Thanks
I would also like to know whether the HP on a motor of this vintage is rated from the prop or the engine. If so, what is the difference? Is this a strong motor or one on the weaker side?
I?ve got it on a 22 foot tri-toon pontoon boat with lifting strakes on all three tubes and I?m not satisfied with the top speed of about 30mph with an RPM of 5100 ? 5400 unloaded and a four blade prop from Power-Tech. Outside of the motor being a bit weaker because of age, would a newer 150 HP such as a mid 90?s Fast Strike make enough difference to justify replacing it?
I?ve got a power head for this motor that the previous owner changed out back in the 80?s and I was wondering about building it up with a bit more HP? Is this easily done or am I asking for trouble?
Thanks