No Acceleration when put into forward gear

[stephan]

Can anyone please give me an idea why my Johnson 65 has no acceleration when i put into gear, the engine idles ok but dies when throttling forward. Thank you

 

[DJ]

Re: No Acceleration when put into forward gear

Need more information. Year? Three or four cylinder.

 

[stephan]

Re: No Acceleration when put into forward gear

Need more information. Year? Three or four cylinder.

Thank you for your reply.
it's a 3 cylinder engine, other markings on the engine cover is POWERSHIFT II. i am unable to find out what year it is but i have been told it's in the mid 70's. i do have an email address which shows the same engine. http://www.smalloutboards.com/j6573.htm

i tried the engine today for the first time in the river, it starts and idles but cuts out when you try to accelerate.

 

[DJ]

Re: No Acceleration when put into forward gear

That is a 1973.

Most likely, it is only running on one or two cylinders. (They will idle fine that way).

With the engine running, in nuetral, unplug (use insulated pliers) one spark plug wire at a time. That will tell you which cylinders are working. While doing that, you will be able to tell if you have spark on all three.

Let us know what you find.

 

[tashasdaddy]

Re: No Acceleration when put into forward gear

then check compression, take plugs out, throttle to wot, jump solenoid to turn engine over 4 times on each cylinder, should be over 100 psi, and within 10% of each other, not 10 psi. post readings. if spark and compression is good, could be dirty carbs, fuel delivery, if this engine is new to you read this link.
http://forums.iboats.com/bbBoard.cgi?a=viewthread;fid=36;gtid=1035575

 

[steelespike]

Re: No Acceleration when put into forward gear

See if the choke helps when you try to accelerate.
If it does that would indicate a fuel supply problem.
If it hadn't been run in a long time the fuel system should be checked from tank to carb with special attention to cleaning.

 

[stephan]

Re: No Acceleration when put into forward gear

That is a 1973.

Most likely, it is only running on one or two cylinders. (They will idle fine that way).

With the engine running, in nuetral, unplug (use insulated pliers) one spark plug wire at a time. That will tell you which cylinders are working. While doing that, you will be able to tell if you have spark on all three.

Let us know what you find.

Hello
I worked on the engine today and that part of it was ok.
i have come to the conclusion that it's the forward and reverse controll mechanism on the boat.
the controll mechanism when put into forward or reverse puts the engine into gear but does not move the throttle cable correctly.

If anyone has a set-up manual for a Johnson POWERSHIFT II controller or can explain in anyway, it would be gratefull

 

[stephan]

Re: No Acceleration when put into forward gear

See if the choke helps when you try to accelerate.
If it does that would indicate a fuel supply problem.
If it hadn't been run in a long time the fuel system should be checked from tank to carb with special attention to cleaning.

I have a manual but i needed help and idears. too many links and levers

 

[stephan]

Re: No Acceleration when put into forward gear

then check compression, take plugs out, throttle to wot, jump solenoid to turn engine over 4 times on each cylinder, should be over 100 psi, and within 10% of each other, not 10 psi. post readings. if spark and compression is good, could be dirty carbs, fuel delivery, if this engine is new to you read this link.
http://forums.iboats.com/bbBoard.cgi?a=viewthread;fid=36;gtid=1035575

Cheers for your help but i have come yo the conclusion that it's the forward and reverse controll box as i have explained to another helper.

 

[tashasdaddy]

Re: No Acceleration when put into forward gear

is this an electric shift or standard shift.

 

[stephan]

Re: No Acceleration when put into forward gear

See if the choke helps when you try to accelerate.
If it does that would indicate a fuel supply problem.
If it hadn't been run in a long time the fuel system should be checked from tank to carb with special attention to cleaning.

I have a manual for the engine but not controller mechanism. i needed help and idears. too many links and levers

 

[tashasdaddy]

Re: No Acceleration when put into forward gear

disconnect the throttle cable at the engine, run it on muffs, and see if it will accelerate with you moving the linkage. if it does you need a new throttle cable.

 

[stephan]

Re: No Acceleration when put into forward gear

disconnect the throttle cable at the engine, run it on muffs, and see if it will accelerate with you moving the linkage. if it does you need a new throttle cable.

Thanks for your suggestion but i have tried that and other ways too.
both cables work ok.
what i am experiencing is that when you move the controll shifter forward the engine engages into gear but no acceleration on the engine thus the engine stalls. you have to move the shifter full travel foward and the same for reverse for the slightest movement of the throttle on the engine.
when i had a look inside the control shifter i noticed that the throttle linkage arm moved only a small amount when the lever was fully forward or in full reverse, further investigation into the control shifter i noticed there is a plastic sort of cam
where the throttle lever runs in.
this cam has a slot which to me looks 1/2 inch to long either side, my opinion if the slot was shorter then the throttle linkage arm would move earlier than full forward or reverse.

any more idears or shall i use a hammer on this control shifter

:'(

 

[michiganmarty]

Re: No Acceleration when put into forward gear

Stephen,

I have a 1988 28hp SPL with remote controls
(single lever).

Mine works the same way and there are NO
worn out parts. It uses about 80% of lever throw
to increase the throttle a small bit, but increases the
timing steadily. Then the last 20% of lever throw,
the throttle really begins to crack open while the
advance plate pretty much stays in one spot.

Does your Throttle cable connect to a lever in the
forward portion of the box, with a nylon slide in the
rear portion of the box traveling in an arc?
If so - the slide is there to keep the cable straight
and perpendicular to the exerted force from the
lever to keep it from kinking and wearing.

I am in the same predicament as you, we shouldn't
have this 80/20 stuff. I would think it would steadily
increase power as you increase throw on the lever.
Also my manual shows nothing about the control box,
and, vague as it is, the motor sync is set correctly.

I suspect some of these old controls just plain work
that way. No offense to anyone here, Lord knows
you can't do better than this forum for help, but
no one has yet to offer an explaination,
so it must be just the way it is. :'(

 

[dungY]

Re: No Acceleration when put into forward gear

you may possibly need to tighten one of the screws on the cable, a small allen i think it's 3/8 located on the cable inside the control box it tightens a steel needle which moves the actual throttle cable..

give that a shot

 

[michiganmarty]

Re: No Acceleration when put into forward gear

dungY,

What needle are you referring to and what 3/8 allen?
I have had my control box completely apart and there is no needle or 3/8 allen anywhere...?

:$

 

[freddyray21]

Re: No Acceleration when put into forward gear

on the end of the cable on both ends there is a black tube that slips over the cable. The cable has a hard steel rod in the middle. There is an allen or sometimes a square screw that tightens against this rod to keep the cable in place. Your's might have some loose.

 

[dungY]

Re: No Acceleration when put into forward gear

That would be the one freddyray21
This had happened to me once I couldn't get the boat into gear but it seemed none of the cables worked incorrectly, I just put it in neutral and the gear into neutral, tightened it and voila

 

[itstippy]

Re: No Acceleration when put into forward gear

You SHOULD be able to shift into Forward, at idle, without stalling the motor. All outboards work that way. Any other setup would be very dangerous and would munch your gears in no time. If simply putting it into gear at idle causes a stall-out because it can't take the load then either you're ideling at too low an RPM or your outboard is lacking torque due to bad compression, dropped cylinder, gummed carb, etc etc.