motor has miss help

[Troyb56]

I have a 1971 60hp johnson, 3cyl. Motor has trouble with a slow idle as it wants to die, I took it to a mechanic and it will idle a little better it has a miss. He adjusted the points and says that he can pull off plug wire 1 and 3 and it don't make much difference, but when he pulls off #2 motor boggs. All carbs have been cleaned and set, timing adjusted, and all plug wires are getting fire. any help out there

 

[Navigator_Victory]

Re: motor has miss help

mechanic should have done what he needed to do to troubleshoot......I would check the compression next..

 

[Troyb56]

Re: motor has miss help

Compression is around 140 on all 3 cyl. I checked this myself. motor starts great everytime.

 

[archcycle]

Re: motor has miss help

They ought to all make a difference when the plug wires are pulled. Sounds like you need to do a few tests of your own. Buy a spark tester ($5 at auto store) and find out if those cylinders are sparking across a 3/8" gap.

 

[Troyb56]

Re: motor has miss help

The plugs that I bought has no gap. Would the tester let me know if they are fireing properly when the engine is running. Thanks for the help, 3 kids really want to go fishing this weekend

 

[Troyb56]

Re: motor has miss help

anymore help out there

 

[Daviet]

Re: motor has miss help

If the compression is good, you need to use a air gap tester and see if the spark will jump a 7/16" gap and is bright blue. I have never had good success with the surface gap plugs and have converted the center electrode type plugs. You might try squirting some fuel mixture into # 1 & 3 cylinders and see if it will pick up. Did the same mechanic that checked it out overhaul the carbs? If so I would find another mechanic and recheck the carbs, because if he can't trouble shoot your system, he sure can't fix it.

 

[Troyb56]

Re: motor has miss help

I did buy a spark tester and will check that, but I do not see how this motor would even start with 2 out of 3 cyl either not fireing right or a fuel problem, I can adjust the fuel screws on all 3 carbs and make motor idle up, and also adjust to make motor die. The mechanic did check the spark and all three plug wires are fireing, he also said he did a check on the motorola ignition box and it checked out, but when running pulling plug wires off makes no difference in cyl 1 and 3. Also said motor jumped into gear when turned key off, that may or may not help you to help me. Thanks again

 

[Daviet]

Re: motor has miss help

Did you try squirting fuel into carbs 1 & 3 under load? That will tell you if you have a fuel problem, maybe the high speed jets are plugged or restricted.
You have an hydroelectric lower unit, it defaults to forward when voltage is canceled to the lower unit. There is a diode in the control box that is supposed to delay the voltage drop to the lower unit to stop the problem.

 

[Troyb56]

Re: motor has miss help

Thanks, I haven't got to get it under load yet, bought used and when took it out, it wouldn't idle down slow enough to put in gear without dying, it will fast idle perfect, but didn't want to slam into gear. My mechanic seems to think it is still an ignition problem, he took all carbs apart, seen nothing wrong, points where closed he said, he set them. He cannot figure out why motor starts fine, but when pulling off plug wires on 1 and 3 seems not to affect motor, but 2 really does.

 

[jimmieb305]

Re: motor has miss help

my boat is having the same promlem only clynder 2 is the one thats has no affect of removing the spark plug boot. iplease keep me poested on any news u find with tis problem . i just bought the boat and was able to get it on the water and under a load it will run but bogs the whole time and wont wind out.

I have a 1971 60hp johnson, 3cyl. Motor has trouble with a slow idle as it wants to die, I took it to a mechanic and it will idle a little better it has a miss. He adjusted the points and says that he can pull off plug wire 1 and 3 and it don't make much difference, but when he pulls off #2 motor boggs. All carbs have been cleaned and set, timing adjusted, and all plug wires are getting fire. any help out there

 

[joe7305]

Re: motor has miss help

look at top seal ..spray carb cleaner under fly wheel if it runs diffrent ..its bad

 

[Troyb56]

Re: motor has miss help

OK, I got boat back tonight and it does idle with muffs on and down in water tank, still has a problem, it will idle fine for around 15 seconds and then bog down for about 3secs and then back up again, it will do this repeatedly. I dont know how this should sound but when idleing it is pretty loud out the exhaust with series of pops and you can tell water shooting out of prop, as it bogs down, the popping goes away and not so much water coming out of prop. Mechanic still thinks it is an electrical issue

 

[Midnight Krawler]

Re: motor has miss help

Find a new mechanic!!

 

[Daviet]

Re: motor has miss help

Lets start over. All it takes to make your engine run properly is timed spark, compression and fuel delivery. You say you have good compression, 140 on all cylinders, we can eliminate that.
Spark, did you check the spark with an air gap tester, does it jump a 7/16" air gap and is bright blue? If the spark checks outOKk, it only leaves fuel delivery.
Did you convert to center electrode plugs?

 

[Troyb56]

Re: motor has miss help

Mechanic said he did spark test and #2 and 3 was great at gap test and number 1 was not consistent with 2 and 3. He did adjust the points and rebuild all 3 carbs. Motor sounds good execpt the surge in the idle, it will never die just bog down and surge up.

 

[Daviet]

Re: motor has miss help

If you have good spark on # 2 & #3, and not on #1, I would be looking at the dist cap, rotor, plug wires under the flywheel.

 

[JWH0420]

Re: motor has miss help

i agree first on the to do list find a new mechanic, second the spark plugs u are using were designed to stop the plug fouling issue of 2 cycle motors personaly i say throw them out and get OE i tried them once hated how it ran and went right back to the old ones and may just be part of ur issue and based on the "mechanics" lack of accurate diagnosis would not suprise me if he got somthing wrong in the work he performed and personaly i would discredit any repairs he did and conciter them possible problems but it does sound as though u have a fuel delivery problem have u looked for gasket leaks

 

[Troyb56]

Re: motor has miss help

Ok, put boat on the water yesterday and it didn't go well, motor would idle with small surge but when put into gear and try to advance trottle it would die everytime, I did adjust the idle screws to a higher idle and then the throttle would advance without dieing when in gear, but only would go about 15 mph, no matter which position the motor was in. I did take apart the fuel filter screen and clean, no help there.

 

[AlTn]

Re: motor has miss help

have you tried using the search feature for a 1971 60hp. johnson?