Screwed Again Looper 120 won't run (fixed)

[alden135]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

Does it just bog and die or does it shut off like you turned the key off? (Harker & Jtexas may be on to something)

Have you tried reving it up with just the carbs? Just advance the roller by hand. If that works then disconnect the linkage and while it's ideling advance the timer base by itself.

It bogs and dies when I advance the throttle. It will not go past slow idle speed without stalling. It will the restart right back up.

I have not tried disconnecting the throttle linkage, but I can observe everything moving like it should with the cable etc.

The motor will rev up fine in neutral, just not in gear under load.

 

[Dhadley]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

So it revs up fine as long as its not in gear, right?

 

[xtraham]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

I do not know much about this 120 but I had the same problem with a 70hp looks loke you have check everything but any way here is my in-put, I had to use torch tip cleaners in the all passages before my carbs would respond at all, it would idle but stall as soon as I put it in any gear this was the 3rd time I went through the carbs, then the motor would bogg when I finaly did get it to respond I found 2 reeds that were not seated now it ran great until I installed the air box, with the air box on it went back to bogging then I found that the air box snout was pinching off the bottom carb fuel line, runs great now, dont get discuraged, could very well be something simple like mine,, good luck

 

[jtexas]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

Have you tried it in gear on the muffs, with no load? Don't rev it too much, just past idle. Long shot, I know...

It's at the mooring so I raised the engine just high enough so it would still get water and had the same problem.

So...it dies with no load on the prop...now we're getting somewhere...take the kill wire (black/yellow) off the pack and try it, to rule out a short in the harness. Then start testing the wires coming off the timer base & stator for broke wire inside the insulation.

 

[alden135]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

I'm going back up tomorrow. I guess I should start checking things in this order.

1) Troubleshoot primer solenoid to make sure it isn't stuck open.
2) Remove kill wire and try. Check wires again. (BTW the timer base is new last summer).
3) Remove carbs and clean along with recirc. valves.

 

[alden135]

Re: Screwed Again Looper 120 won't run (updated again)

Re: Screwed Again Looper 120 won't run (updated again)

Checked above this weekend. All checks out ok. I removed the carbs and checked those also, no dirt at all.

Same problems as before. It will start ok, but when I put it in gear and apply any throttle at all above idle, it bogs and dies. I have the test prop on it now at the mooring.

Any possibility the new timer base is shot?

I can rev up it in neutral, but sometimes it will stall after a few minutes.

I rechecked the compression again to be sure. 125 125 126 125.

 

[xtraham]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

have you tried running a stiff wire through all the carb passages jets ect from inside out and outside in and blowing with compressed air im not an expert on o/b's but thats what it took for me to solve almost the same problem, I soaked and used compressed air twice and I was sure it was not the carbs but I finaly used the wire (torch tip cleaners) problem solved not saying this is your problem but if you have not tried wire through the passages its easy and worth a try. good luck..

 

[alden135]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

Thanks xtraham. My carbs are actually quite simple to clean. They're plastic, so I can't soak them. They are spotless though.

 

[rickdb1boat]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

With the throttle cable disconnected at the motor, can you shift into forward gear from the remote without it dying? Then can you manually push the timer/throttle open and see if it dies? Of course, you would have to be moving on the water or tied securely to the dock. If this works, you can 99% bet it's in the throttle control(Short) or in related wiring on the way back to the motor...

 

[alden135]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

With the throttle cable disconnected at the motor, can you shift into forward gear from the remote without it dying? Then can you manually push the timer/throttle open and see if it dies? Of course, you would have to be moving on the water or tied securely to the dock. If this works, you can 99% bet it's in the throttle control(Short) or in related wiring on the way back to the motor...

Are you trying to troubleshoot my start in gear protection? If so, it's not connected at the concealed mount control. I never hooked those wires up when I replaced the controls last spring. one of those things I was about to get to when this latest round of problems started.

I have the test prop on it, so I could try your idea at the mooring.

 

[DHPMARINE]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

Sounds like everything going into the engine is decent. Has the exhaust been checked to see if all this can get out ? A motor is similar to an air pump.If fuel/air can't get in,it won't work,if fue/air can't get out,it won't work.

Just wondering ...... has the gearcase been apart prior to this problem ?

DHP

 

[alden135]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

Hey there DHP, long timed

I changed the impeller this spring and got the motor running great for a whole month. Other than that, I have not touched the gearcase.

What could go wrong with the exhaust?

 

[Walker]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

You can soak those carbs and I suggest you do soak them and give them one more good cleaning.
I soak them all the time in Berryman Chemtool with no ill effects.

 

[Walker]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

You can soak those carbs and I suggest you do soak them and give them one more good cleaning.
I soak them all the time in Berryman Chemtool with no ill effects.
I chased a problem on my 120 for 2 years before I figured it out. Mine started after a decarb and the port from the recirculation system to the upper crank bearing got stopped up. Fixed that then got an air leak around the crankcase cap.

 

[rickdb1boat]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

What I was trying to narrow down is the stalling when you put it in forward. Ok, lets try this. Disconnect both the throttle and the shift cable at the engine. Then with the motor running, shift into forward. See if it dies. If not, try manually throttling up using the timer arm so that you are also advancing the timing(Not just the carb linkage). See if it will go. This will eliminate any problem coming from the remote control on back to the engine. Also, if you can, take a look at the throttle plates and make sure they are all fully open(Horizontal) when the throttle is wide open and that they are fully closed when you close the throttle.

 

[DHPMARINE]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

Darned if I can find my post so I'll try again.

Is the exhaust able to get out of the engine?

Sounds like it is blocked.

DHP

 

[alden135]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

What I was trying to narrow down is the stalling when you put it in forward. Ok, lets try this. Disconnect both the throttle and the shift cable at the engine. Then with the motor running, shift into forward. See if it dies. If not, try manually throttling up using the timer arm so that you are also advancing the timing(Not just the carb linkage). See if it will go. This will eliminate any problem coming from the remote control on back to the engine. Also, if you can, take a look at the throttle plates and make sure they are all fully open(Horizontal) when the throttle is wide open and that they are fully closed when you close the throttle.

I did check the throttle plates, and they open and close fully like they should. I can stand at the helm and advance the throttle and see the linkage working. The throttle advances the timer base like it is supposed to.

I'm wondering now if there is some problem with the timer base internally.

So to recap what I've done:

cleaned carbs
linc/sync
checked timer advance
checked spark-jumps 1/2 gap on spark tester
checked compression
replaced cracked fuel pump and replaced with fuel only pump
tried remote tank
cleaned recirc valves
checked leaf plates
put old pp back on
pulled flywheel, checked for sheared key, inspected stator
checked all fuel lines
decarbed
bulb works
checked primer solenoid
inspected wiring on timer base
choked while running-stalls
squeeze bulb while running-no effect, stays firm between stalls
swore at motor

 

[DHPMARINE]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

I've seen the bearing carrier installed upside down,and have had 'critters' move in and make a nest.If the exhaust can't get out ....... about the same as fuel/air not getting in.Just something ya might want to look at.

DHP

 

[alden135]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

It was running for a few weeks before this latest breakdown. I don't think the gearcase was ever taken apart.

 

[DHPMARINE]

Re: Screwed Again Looper 120 won't run (update)

Re: Screwed Again Looper 120 won't run (update)

Well I sure didn't swim up ....... well you know what I mean .

What actually happned in those two weeks ?

Something went south,and we are not finding it.

I think (still) the problem may be in the exhaust not being able to get out of the engine.

DHP