loosing power at wot

[johnboy2b]

i have 1994 175hp johnson. once the the gets up to temp and running at wot the motor looses rpm and speed. the tach only reads 4800 at wot hot or cold
i have been told it is reg/rectifier or power pak. i have new plugs, wires, and coils. please help if any one can

 

[jonesg]

Re: loosing power at wot

I don't think the rect/regulator has anything to do with the ignition at all.
You need to run some tests, per the manual.
Do you have Champion QL78YC plugs?

http://www.maxrules.com/fixomcoisignition.html

Have you checked that the timing linkage is advancing all the way at WOT?

 

[Fl_Richard]

Re: loosing power at wot

I have a 1995 150 rebuilt all 6 carbs last year and it has had WOT RPM similar to what you stated. Swore the carbs were perfect. Worked on it for countless hours before checking them again. Removed the bowls and found a chunk of crap in them. They were evidently clean but the hose had crap in it.

Check your carbs!

 

[johnboy2b]

Re: loosing power at wot

thanks i'll check them again and check over wiring. but the tach issue still bugs me. it works fine until it gets to 4800. once and awhile it will rise a couple hundred rpms. not often though. checked all grounds and connections at battery. this is the third tach. the others just quit working. i not knowing that there may be another issue.