British Seagull 40 Plus Won’t Shut Off

[aquasonic]

I have a British Seagull 40 Plus model that when the accelerator is turned to its lowest setting will not shut off. I’ve tried adjusting the cable, and now it will reluctantly shut off when I choke it, but that’s the only way it will stop.

I don’t know if I’m missing something here. Hoping someone can help. Thank you.

[Robert Rowland]

My 40+ shuts off when I move the throttle position lever toward the

left side of the boat, as far as it will go.

Perhaps you need to adjust the throttle cable.

I too have shut the motor down by closing the choke flap.

I admit the motor always seem to fire once or twice before it quits.

Bob Rowland

 

 

[Tubs]

I’ve never had a British Seagull but have had several
British bikes and I’m familiar with the control.
The inner part of the cable may have broken at one end,
was reattached, and now its too short to get the full
range of movement. If that is the case shortening the
outer part of the cable some may solve your problem.
Tubs

A "Boathouse Repair" is one that done without having tools or the skills to do it properly.

[Monte NZ]

I have two Seagulls, both with Villiers Carbys and assuming you have the  same setup, the first thing I would check for, is to  look through the choke opening to  the throat of the carb behind, and see if the piston, (which is attached to the throttle cable), is going right to the bottom of the throat when you move the throttle lever backwards and forwards. You you should see the piston rising and falling and  if it’s not falling flush with the bottom of the throat the motor will still keep running.

The other thing to check, is that the knurled thumb screw on top of the carb has been screwed down correctly. You will see a little cut away in the top of  the knurled thumb screw  that allows the throttle cable to sit correctly…………it’s very easy to screw that down and trap the little cable fitting.

Hope this helps.

Monte NZ

 

 

 

 

 

 

 

 

[Mumbles]

Can’t get it to shut off?

I’m envious as my experience with Seagulls is trying to get them started!

[aquasonic]

Monte NZ wrote:

I have two Seagulls, both with Villiers Carbys and assuming you have the  same setup, the first thing I would check for, is to  look through the choke opening to  the throat of the carb behind, and see if the piston, (which is attached to the throttle cable), is going right to the bottom of the throat when you move the throttle lever backwards and forwards. You you should see the piston rising and falling and  if it’s not falling flush with the bottom of the throat the motor will still keep running.

The other thing to check, is that the knurled thumb screw on top of the carb has been screwed down correctly. You will see a little cut away in the top of  the knurled thumb screw  that allows the throttle cable to sit correctly…………it’s very easy to screw that down and trap the little cable fitting.

Hope this helps.

Monte NZ

 

 

 

 

 

 

 

 

I sold this motor but would like to help the buyer solve this problem. The brass piston inside the carburetor throat was not closing all the way. Earlier on, the motor was shutting down as it should. I do recall adjusting the location of the throttle on the tiller handle sometime prior to the issue.

After looking through some literature, that was kindly sent to me by cajuncook1, there is a very specific design location and orientation of the throttle, and mine was set too far towards the tiller grip. I’d like to readjust the throttle and see what happens. The cable adjustments didn’t help, and the keyed carburetor cover is positioned correctly. Service sheet no. 7 in a service manual shows the center of the throttle to be only 2 1/8″ from the tiller tilt bolt. I tried to post the manual, but the file is “too big”.

 

[aquasonic]

This not shutting off is still a problem. I am trying to get in touch with Monte NZ, (Monte Jones) but having trouble with sending a message by this website.

I don’t see an email listed for him in the membership directory. If anyone can help, please respond here, and I can contact you by email. Thank you.

[aquasonic]

Finally, the Seagull 40 Plus is working as it should. After reading everything that I could find on the subject, a light finally came on. After taking the carburetor top off for about the sixth time, the whole problem was very simple.

The throttle cable had an end stop on it that protruded well beneath the bottom of the brass cylinder. The protruding end was preventing the cylinder, which takes the place of a butterfly, from completely closing.

The solution was to tape off the needle at the bottom of the brass cylinder for protection. Then, with a small fine flat file, I carefully filed the cable end until it was flush with the bottom of the brass cylinder. This is likely the original cable from the factory.

Hopefully this thread helps others down the line. Special thanks to cajuncook1 and Monte NZ. They pointed me in the right direction. This motor now runs fantastic and shuts down as it should.

[Monte NZ]

Well done Aquasonic! Very pleased that I was able to help you to find the problem.

1 user thanked author for this post.

aquasonic

[cajuncook1]

Well done Aquasonic!!

1 user thanked author for this post.

aquasonic

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