Wspcl stutters and dies mid throttle

Having problems with a Seagull? - ask an expert here

Moderators: John@sos, charlesp, Charles uk, RickUK, Petergalileo

bay_cloud
Posts: 11
Joined: Mon Jun 12, 2017 6:06 am
Location: San Francisco Bay

Wspcl stutters and dies mid throttle

Postby bay_cloud » Sun Aug 06, 2017 7:56 pm

Hey all, i have a saltwater seagull. Starts up decently well, but unless i give it 2/3rds to full blast without choke it dies. It can do a slow idle fine.

Is this anything other than a carb clean or adjustment? Can fuel mixture cause this?
Last edited by bay_cloud on Thu Aug 10, 2017 6:38 am, edited 2 times in total.

User avatar
seagull101
Posts: 372
Joined: Mon Jan 23, 2017 10:30 pm
Location: Scottish islands

Re: Wsplc stutters and dies mid throttle

Postby seagull101 » Sun Aug 06, 2017 10:06 pm

It will more than likely be a fuel problem, is it a amal 416 or a amal 2 jet?
For the 2 jet:
Remove the banjo bolt on the bottom of the carb and clean the filter thats inside the bolt, you may as well dismantle and clean the whole fuel system while you are at it!

For the 416:
Unscrew the screw that holds on the fuel line, remove the filter and clean, you also probably should clean the whole fuel system as well.
Also for the 416 you should unscrew the float bowl and clean.

Check and double check that you can clearly see daylight looking through the jets in your carb, just one on the 416 and 2 jets on the 2 jet/46n, hence the name 2 jet!

For the mixture on the 2 jet:
Size 45 jet is 10:1
Size 40 or no number is 25:1

For the mixture on the 416:
Size 95 is 25:1
Size 100 is 10:1

Hope this helps you.

Jacob

User avatar
Charles uk
Posts: 4326
Joined: Wed Feb 27, 2008 4:38 pm
Location: Maidenhead Berks UK

Re: Wsplc stutters and dies mid throttle

Postby Charles uk » Sun Aug 06, 2017 11:43 pm

Jacob there is no 10:1 jet for the 416, If you read the owners manual the 100 jet was used in a 418 on a Curlew!

It wouldn't hurt to check the filter is clean on the fuel tap.
Make it idiot proof and someone will make a better idiot.

bay_cloud
Posts: 11
Joined: Mon Jun 12, 2017 6:06 am
Location: San Francisco Bay

Re: Wsplc stutters and dies mid throttle

Postby bay_cloud » Mon Aug 07, 2017 2:01 am

Ok, probably time to pull it from the boat. It's the 10 to 1 carb.

red42hj
Posts: 48
Joined: Sun Oct 16, 2016 1:31 pm
Location: wiltshire

Re: Wspcl stutters and dies mid throttle

Postby red42hj » Wed Sep 06, 2017 8:19 am

Hi Bay Cloud, did you solve the problem? Idling ok but erratic open throttle sounds like the jets.

bay_cloud
Posts: 11
Joined: Mon Jun 12, 2017 6:06 am
Location: San Francisco Bay

Re: Wspcl stutters and dies mid throttle

Postby bay_cloud » Sun Dec 17, 2017 4:22 am

Sorry for the lack of followup. Finally got a chance to totally clean the carb. Don't have carb needle tools though so while i have an Amal carb, i dont know if a previous owner changed needles. It does have an autolite d9 equivalent spark plug...will test a d21 tomorrow which is my spare.

It runs about the same, and better on a super low oil mix (25 to 1). Sure doesnt seem to have any leaks, everything is tightened down well amd hose looks in very good condition.

bay_cloud
Posts: 11
Joined: Mon Jun 12, 2017 6:06 am
Location: San Francisco Bay

Re: Wspcl stutters and dies mid throttle

Postby bay_cloud » Sun Dec 17, 2017 4:24 am

20171216_191325.jpg
Plug pic
You do not have the required permissions to view the files attached to this post.

Adrian Dale
Posts: 758
Joined: Wed Apr 16, 2014 7:58 am
Location: Tasmania, Australia

Re: Wspcl stutters and dies mid throttle

Postby Adrian Dale » Thu Dec 21, 2017 10:51 am

Looks to me like you are running too rich, perhaps at 25 to 1 without the correct needle. If you want to run at 25-1 get the correct needle from John otherwise run with a correct mix of 8 to 1 which will give correct fuel to air ratio in the combustion chamber. The wet on the plug is not oil, but unatomised fuel. Then give her a good hard run she will thank you for it. I never change the design fuel mix on any of my engines. if you are into racing you will want to try a richer mix, but if not stick with BS recommendations. The fuel to air mass ratio will be correct resulting in good atomisation, the correct air fuel mass ratio is critical best regards, for xmas AJ

User avatar
Charles uk
Posts: 4326
Joined: Wed Feb 27, 2008 4:38 pm
Location: Maidenhead Berks UK

Re: Wspcl stutters and dies mid throttle

Postby Charles uk » Thu Dec 21, 2017 1:35 pm

Bay-cloud after giving your carb a real good spring clean, why not take it into Sean (415-861-6124), he must be only be up the road from you, he will be able to tell you which jets your carb has & what fuel mix it's setup for.

A very nice man, I met him the year his son was born, give him my regards, he knows his stuff, he's local & can supply you with a new spark plug.
Make it idiot proof and someone will make a better idiot.

Adrian Dale
Posts: 758
Joined: Wed Apr 16, 2014 7:58 am
Location: Tasmania, Australia

Re: Wspcl stutters and dies mid throttle

Postby Adrian Dale » Sat Dec 23, 2017 6:30 am

sage advice Charles

bay_cloud
Posts: 11
Joined: Mon Jun 12, 2017 6:06 am
Location: San Francisco Bay

Re: Wspcl stutters and dies mid throttle

Postby bay_cloud » Sat Dec 23, 2017 8:15 am

Alright so I was able to figure it out! Apparently a deep skinny 5.5 mm socket will undo the jets. So I have a 25 and a 45 I believe (amal 2 jet). I tried running it on 10 to 1 and what I noticed was that it needs choke for sure to start, and then when I take the choke off it starts to die. However if I increase the throttle then it easily catches on again. So basically idling with and without choke requires two different throttle settings.

The needles and everything else appears to be in good condition anyway. Am going to test it tomorrow

bay_cloud
Posts: 11
Joined: Mon Jun 12, 2017 6:06 am
Location: San Francisco Bay

Re: Wspcl stutters and dies mid throttle

Postby bay_cloud » Sat Dec 23, 2017 10:20 pm

Ok well after actually taking it out on the water the update is that it runs great at idle with choke all day. But when I take the choke off and give it any kind of throttle it sneezes almost immediately after rising in revs. It will keep puffing popping or sneezing until it dies without choke.

User avatar
Charles uk
Posts: 4326
Joined: Wed Feb 27, 2008 4:38 pm
Location: Maidenhead Berks UK

Re: Wspcl stutters and dies mid throttle

Postby Charles uk » Sat Dec 23, 2017 10:25 pm

It doesn't sound like you cleaned it very well, somewhere you've got a fuel restriction, clean everything right back to the fuel in the fuel tank!
Make it idiot proof and someone will make a better idiot.

bay_cloud
Posts: 11
Joined: Mon Jun 12, 2017 6:06 am
Location: San Francisco Bay

Re: Wspcl stutters and dies mid throttle

Postby bay_cloud » Sun Dec 24, 2017 1:04 am

Aaaand the last update is that my champion d21 spark plug is either the wrong type or broken. The autolite 373 ran almost totally fine (still finicky going from choke to no choke - i have to get in gear with choke). Almost there!


Return to “Help”

Who is online

Users browsing this forum: No registered users and 8 guests