INFO.

[bassfishindeerhuntin]

Hey guys, need some info on my 1995 150 johnson faststrike. I dont feel i am getting out of it what it can really do. I am turning 4900 rpms at about 58mph gps
it is on a 1995 stratos 284, 18 ft boat. 3 blade ss prop 24, compression is 120 psi each cylinder. The reason is over the last year i have noticed a drop in horse power and top end speed probably about 6 mph, it just seems sluggish, new plugs, new prop, i have a family memeber running a 97 javelin 18 ft same motor and set up and he is running 5800 rpms at bout 68 to 70 mph gps, What can i do to jump up my performance?

[ELGIN]

Welcome to the BBC.

Did you drop any RPM's?

[stratos284]

My 150 intruder is on the same boat and I only get 4900 rpms hits about 59 gps.
pad height on mine is 5 3/4 my motor needs moved up but to move it more than 3/4 inch I'll have to move the motor up on the jackplate. I need to do it just havent had time.

[bassfishindeerhuntin]

Thnks, it has always usually run around 5300 rpm right around in there. i have read alot about how these engines can really get alot out of them, not looking for scary fast you know just enough to be competitve in tournaments

[stratos284]

I would check your pad height if you have always had the same rpms and speed

[stratos284]

It may be something else if you were at 5300 and now your at 4900

[ELGIN]

Check the basics first, compression would be a good start, might want to decarb depending on what oil you are running.

Do you change the gear lube on a regular basis?

Is there any fuel on the outside of the carbs?

[bassfishindeerhuntin]

gear lube changed yearly, use the evinrude/johnson brand oil, compression is 120 psi each, and there is some oil present outside of carbs, not fuel, and i noticed that it uses more oil than it use to,

[bassfishindeerhuntin]

how do check it?

[ELGIN]

Is the oil on the carbs from the bowl gasket surface down?

[bassfishindeerhuntin]

yes, and some on the hoses around carbs.

[ELGIN]

It may be that the carb bowls are leaking and if they are they can suck air.

[bassfishindeerhuntin]

would that cause the lack of power or top end and rpm drop?

[bassfishindeerhuntin]

And how do you decarb? never done that before. do you think i need it done?

[ELGIN]

Get some BRP Engine Tuner and follow the directions, and yes, unless you have been running XD-100 it will need a decarb.

Yes, the carbs leaking can cause the RPM loss and low top end speed.

[bassfishindeerhuntin]

Thanks alot, you may have helped me solve a major problem, are there any add ons or upgrades i can do to add performance?

[ELGIN]

A lighter boat.

[bassfishindeerhuntin]

i heard that! thanks have a good one