Carb/Starting assistance

[rickd20006]

83 70hp Johnson
had problems throttling up slowly Would bog and stall everytime.To get going I had to put it down fast. Then back off once out of the hole.
So I did the kits on all 3 carbs thinking that woudl do it.
Now I still have the problem as well my motor seems to hesistate more like it has more power to give at WOT but it's being held back. Must be carb related I would think seeing as it didn't do this prior to the kits.
The other issue.
Had trouble starting the motor I would get it going fine and then if for some reason I stalled out it wouldn't turn over again or if it did it was very slow and eratic and then out of the blew it would crank fast and start. I did notice the starter drive would stay engaged at times and then sometimes it would drop. I even bought a brand new 700 deep cycle battery. Didn't work. Battery cable ends replaced and all connections tight. Starter brushes replaced as well.
Ideas much appreiated.
Thanks again guys great to know you're around.

 

[jtexas]

Re: Carb/Starting assistance

To state the obvious, you have an intermittent electrical fault in your starting circuit. Battery to keyswitch to solenoid to starter motor. Could a brush lead be close enough to the housing to sometimes arc and short it out? Or the positive post lead?

When you brought the new battery home did you test it? Believe it or not sometimes they'll sell you a battery that's been on the shelf long enough to self-discharge.

Make sure your carb throttle plates are parallel to each other, also the timer base moves smoothly to its stop without sticking.

 

[rickd20006]

Re: Carb/Starting assistance

Hey thanks for the reply
I'm leaning more toward the key switch.
I changed the brushes because of this problem.
It was doing the exact same thing prior to the change.
The positive lead had a protective sheathing on it
Pretty sure it's not touching. I did however at first forget to replace the washer that separates the terminal
(pos cable)from the housing. (not a good thing)
How would I check the staing circuit?
I should probably just change the solenoid.
The battery was tested 12.65v (good)
Would the solenoid cause the starter to get really hot.
I would only attempt starting for about 4 to 5 seconds. Then stop. Every 30-45 seconds.

Hey thanks again for your help.

Rick

 

[jtexas]

Re: Carb/Starting assistance

I can't think of any way in which solenoid could fail that would result in heating up the starter. If anybody else knows maybe they could jump in here.

The starter will get hot if it has an internal short, or if it's dragging (something preventing it from turning), or if it's engaged for more than, say 20 or 30 seconds at a time, maybe 15, I'm not too sure exactly, let's just say more than normal.

Could be something in the starter other than the brushes...commutator or armature...there are tests for those, see either the seloc manual or the factory manual.

Starter gets 12V and doesn't spin you know it's the starter, but you have to test it while the problem's happening. 12V at the solenoid input post (small post, yellow/red wire) but low volts at starter then you know the solenoid's bad. Low volts at the solenoid, then look at wiring harness, keyswitch, neutral safety switch.

Another possibility not mentioned is an internal engine problem making it hard to turn over...how's the compression?

 

[F_R]

Re: Carb/Starting assistance

Just a guess--Check for water getting in the cylinders. Water doesn't compress. That can overload the starter, causing heat. Also a suspect for poor running.