1975 25hp Evinrude

Start off by saying i feel really stupid because i dont know what some things are called I got a 1975 25hp evinrude the thing under flywheel were throttle hooks and goes over to the other thing on the shifter that wont let u run full throttle i think when u put in gear it binds up and kicks back or slips can someone please tell me what might be wrong I have put all kinds of new parts on this motor because it would not run at high speed it runs great at idle but will not go any faster I have put all new coils ,points and condensors and even rebuilt carb. took lower unit apart it was all good now i see this throttle thing is sliping or something THANKS for any help

Re: 1975 25hp Evinrude

Howdy, FLKRACKER.

Welcome to iboats.

Under the flywheel is the stator plate, which adjusts ignition timing. It is operated by your throttle control and is linked to the carburetor, so the spark timing and carb throttle advance together.

I think on that model the shift linkage limits the stator to low speeds when in Neutral or Reverse. My wild guess is that the parts of the shift linkage that limit speed in N and R have slipped out of adjustment or are damaged, but your description is not clear enough yet.

Please give us the model number and tell us whether it is electric start or rope start.

Good luck.

Re: 1975 25hp Evinrude

When underway, does the motor jump, like you hit as log or other underwater object?

Re: 1975 25hp Evinrude

You may want to try a link and sync(its in the top secret files). Have you cleaned your carb? And does your butterfly open completely horizontal when in gear at full throttle? What may help is if you can take a picture of what your talking about, or a short video.

Re: 1975 25hp Evinrude

outlawfox13 said:

You may want to try a link and sync(its in the top secret files). Have you cleaned your carb? And does your butterfly open completely horizontal when in gear at full throttle? What may help is if you can take a picture of what your talking about, or a short video.

Click to expand...

I took some pics but i think i fixed it when i took it all apart i made sure to put it back the wAY IT WAS I guess somebody before me put the copper color lookin plate upside down but now it wont idle im thinking maybe the reeds i hope. It would run great before but now i had to adjust the screw out about 8 turns to make it run and it is still [ lean poping] i think its called and will not idle i rebuilt carb a few weeks ago and now its doing this so i went back through carb and it all looks good i had motor laying in back of truck for a few days driving around could this be the reeds like i said it idle and runned great before is there a way it could have got out of timming THANKS for the help glad i found this place alot of good info and good people on here

Re: 1975 25hp Evinrude

Flkracker; There are several replys to a post by,

1976 25 hp Points question


Started by 69 Alumacraft‎, November 25th, 2011 11:13 PM

that deals with the problems you are having in this section farther down. If you go to his post here you will find just about every answer to the problem you are having with your motor. The replys will go into some detail as how to fix most all the electrical and fuel systems troubles. Your motor should be the same as a Johnson 25hp made in 1976. First make sure your Module# and serial # are for a 1975 year of motor.
If the stator plate is jumping around you might have the coils set out to close to the flywheel, or the bearing ring under the stator might cause trouble also. Those motors are great runners when tuned up properly.
I don't think you have any thing wrong with the reeds as it would start and run before. Your trouble will be in the carb, tuneup, or linkage synic timming of the motor.

Let us know what you find out with the Mod# and SR# and we will help all we can to get you back on the water.

Oldman570