Can't adjust timing, Timer base repalcement?

[FillupD]

Re: Can't adjust timing, Timer base repalcement?

I set the timing with, the throttle in full, spark tester on one plug and jumped the solenoid. Thats when I set it at 4 degree under spec.
I checked the timing at 2500 when it was in the water, on the trailer and running full throttle forward. Thats all it will rev unless I lift it out of water and then it will rev up. I didn't take a RPM reading under no load because I didn't think it was good for the motor to run like that (revving high under no load).

 

[FillupD]

Re: Can't adjust timing, Timer base repalcement?

It looks like everything is in order, I can't find anything on link & sync except to line up cam follower with mark so I am going to go to the next step and replace the timer base and give the brass bushing and derlin ring a cleaning.

Any advice from a Evinrude Guru?

 

[Benny1963]

Re: Can't adjust timing, Timer base repalcement?

not a guru but had several 1972 and 73 models
in the video it appears that the timer base is moveing kinda slow
but i went out to my old beater 50 today 1972 evinelec shift fixing to go thru it comps getting low lots of use .so i onhooked my timer base at the launch and pulled up to 3800 no prop with timer base unhooked .put it back on and pulled up to 4500 it probaly would have pulled up higher unhooked but i didnt want to damage it to were i had to bore any more holes than needed.
sounds like link and sink or still something with carbs ,did you remove
welch plugs on high speed jets .what do your plugs look like .
loaded up dry ? fire it up have you checked spark at rpm with timeing light
to see if ign sys is breaking down . i have some carbs for that motor there free pm me .also the small gasket in the center of carb is there correct
shoot some premix in carb throats and see if it picks up rpm

 

[FillupD]

Re: Can't adjust timing, Timer base repalcement?

Yeah, the center gaskets are in. I believe the carb kit was installed correctly and clean.
My plugs are dry and 1/2 of the outside ring is dark, not really black, black, and the other side of the ring looks clean, a little dark but shiny. So if you are looking at the plug you see the electrode and inside black, really dark brown. And the outside of the plug shiny on one side and dark on the other side.

I'll get it to the lake and try the pre-mix. I have tried it once and it didn't raise the RPM but I'll give it another shot. I shot some gum out in there too and it didn't change anything except it about died until I let off the spray.

It goes from idle to (as far as WOT it will go) smoothly and quickly. It does get my boat up on plane a little bit but I know there is more there.

Thanks, Phil

 

[Randyg123]

Re: Can't adjust timing, Timer base repalcement?

Do you know for sure the rpm's are only 2500?

Is the tach working correctly? If new to this motor, is it set to the right number of poles?

Is the rectifier okay? (That's where the tach signal comes from).

 

[FillupD]

Re: Can't adjust timing, Timer base repalcement?

I have checked the Rpm's with a hand held meter. The idle RPM's are around 800 so I assumed that the meter was working properly. Should I try to get a RPM number from an alternate source?
I also checked the motor when it was dark last night to see maybe if there was stray spark but it looked OK around the plugs.
It still bothers me that no matter where the rubber stopper is, the RPM's are the same. I thought that was for the timing and certainly the sound of the motor would change with the position of the spark advance stopper and timing base position.

 

[Randyg123]

Re: Can't adjust timing, Timer base repalcement?

I looked at that video link you provided earlier and saw something different with that engine compared to mine (a different engine) and was curious it the throttle/timing operation on that engine is correct.

If you watch the video, as the controller is advanced you will see a slight bump on the timing linkage, then no movement. As the controller is continued to be pushed forward you see the throttle cam rotating but no movement in the timing linkage or the throttle valves (Poor link-n-sync?). Then the throttle valves start rotating, then finally the timing link starts moving.

I have no idea if this is normal for that engine. On mine (135HP) the timing advances first, then the cam engages the throttle valves, they both advance until the timing hits the stop and then the rest of the movement is the carbs alone. The reason I asked is because for me, it is very easy to tell the timing advance is working (at least partially) because the engine idles up before the cam engages the throttles on the carbs.

Your engine appears to be the opposite. It throttles up with the carbs first and then with the timing and carbs last. Other out there probably already knew this, I didn't.

 

[FillupD]

Re: Can't adjust timing, Timer base repalcement?

I'll adjust the linkage and see if I can't get it trying a couple of different positions. Thanks for the comparison. Any advice that gets me looking at a solution is always welcome.

 

[FillupD]

Re: Can't adjust timing, Timer base repalcement?

Ok, I just replaced the timer base and the motor acts exactly like your 135 motor. The third paragraph in your reply is what mine is doing to a tee.
I started on the muffs and put it gear and reved just a little and it acts like it may work. But its acted like that before. I'm off to the lake to give it a go and see if the problem was fixed.
I hope my hair comes back all messed up from the wind. Oh, wait a minute, I'm bald. I'll let you know what happened.
Thanks RandyG123

On mine (135HP) the timing advances first, then the cam engages the throttle valves, they both advance until the timing hits the stop and then the rest of the movement is the carbs alone. The reason I asked is because for me, it is very easy to tell the timing advance is working (at least partially) because the engine idles up before the cam engages the throttles on the carbs.

 

[FillupD]

Re: Can't adjust timing, Timer base repalcement?

No such luck for me. Maybe that year has a sensor in it that would only let the motor run 1/2 throttle if it overheated. Mine does not overheat but there may be a sensor bad. I think only the newer ones had those. Any one know for sure?

I can take it to the boat shop tomorrow get it back around the middle of July. (minus a couple of hundred bucks no doubt) I was thinking that is not to desirable but at this point, It will be a shorter time before I get it figured out.

 

[Benny1963]

Re: Can't adjust timing, Timer base repalcement?

you dont hve a sensor stopping it from reving up try the timeing lite at your max rpm see if it breaking down look at the light on every cyl while running it at the point that it stops reving you may ahave a pack breaking down or elec prob in ignition ,time for some of the heavy hitters on here to step up

 

[FillupD]

Re: Can't adjust timing, Timer base repalcement?

I'm not sure about the actual spark plug firing inside the cylinder, but there is 12,000 volts output from each coil at 2500 RPM's. What seems weird is that there is 18,000 volts at 1000 RPM's. I would think the voltage would go up, but I'm not sure about that.

 

[FillupD]

Re: Can't adjust timing, Timer base repalcement?

I talked to the generator guru at work today and was asking him about the coil voltage and it looks like it is OK.
He says that that is the way it is and explained why. He said blah, blah, blah, but I did get , when resistance goes up ,voltage goes down. It is "Ohms Law" and the characteristics of all electrical current.
At least that part is OK now.

 

[FillupD]

Re: Can't adjust timing, Timer base repalcement?

Doe a rectifier on the motor have anything to do with RPM's at WOT? I have been having problems with RPM's at 2500 at WOT and the only thing I have not replaced is the rectifier.
If the rectifier won't fix it I would assume the jets are worn out of the carbs?