Leaky petrol taps.

Information relating to the Matchless G12 or AJS Model 31 650cc twin
Member
Posts: 45
Joined: Sat Apr 06, 2019 10:52 pm
Location: Perthshire UK

Leaky petrol taps.

Postby Mollbhan » Tue Mar 24, 2020 5:17 pm

Hi all, I have a 61 G12, bike tends to sit for a few weeks at a time so when I turn on the petrol the corks in the tap have dried out and petrol pisses out. I want to change the taps for lever type taps, not sure about size, are they 1/4 BSP?

Member
Posts: 92
Joined: Wed May 08, 2019 6:41 pm
Location: UK

Re: Leaky petrol taps.

Postby electrajohnt » Tue Mar 24, 2020 6:15 pm

Stick with what you have got and boil the forks or put new ones in.
JohnT

Member
User avatar
Posts: 2138
Joined: Mon Jan 01, 1990 12:00 am
Location: LANCASHIRE UK

Re: Leaky petrol taps.

Postby dave16mct » Tue Mar 24, 2020 6:15 pm

Usually 1/8 BSP.
I'd try dunking em in a cup of boiling water first. Then soak in oil overnight and put back in the taps. Also us a Dowty washer when putting back in the tank. If that doesn't work get new corks. I hate those taper taps, they either work or leak but always too stiff. I haven't tried the taps with neoprene 'O' rings, perhaps someone else may coomment?
Dave.

Member
Posts: 520
Joined: Thu Mar 31, 2005 12:00 am
Location: BERKS UK

Re: Leaky petrol taps.

Postby Andy51 » Tue Mar 24, 2020 6:37 pm

I used the Enots brass push slide for on taps ("hexagON") with neoprene washers and the slide got progressively stiffer - to the point of being almost impossible to move - but no leaks. Changed for cork washers, slide works freely and no leaks either. So, as Electrohnt says, put in new corks and it should solve your problems. Cheers, Andy

Member
Posts: 401
Joined: Tue Oct 24, 2017 11:05 am
Location: DEVON UK

Re: Leaky petrol taps.

Postby MalcW » Wed Mar 25, 2020 9:25 am

electrajohnt wrote:Stick with what you have got and boil the forks or put new ones in.


How does boiling the forks help? :D

Malc

Member
Posts: 6607
Joined: Wed Sep 01, 2004 12:00 am
Location: WEST SUSSEX UK

Re: Leaky petrol taps.

Postby SPRIDDLER » Wed Mar 25, 2020 9:30 am

MalcW wrote:
electrajohnt wrote:Stick with what you have got and boil the forks or put new ones in.


How does boiling the forks help?

I think it softens 'em, Malc.

(Jeez, I must be bored as I'm reading topics about Twins :roll: )
I poke badgers with spoons.

Member
Posts: 1093
Joined: Wed Oct 12, 2005 9:45 pm
Location: KENT UK

Re: Leaky petrol taps.

Postby alanengineer » Wed Mar 25, 2020 9:47 am

Sprid, its day two, only 19 days left. Boris wont let us down, then we can go on a long earnt ride.

Member
Posts: 45
Joined: Sat Apr 06, 2019 10:52 pm
Location: Perthshire UK

Re: Leaky petrol taps.

Postby Mollbhan » Wed Mar 25, 2020 11:49 am

Thanks for the response everybody, I took the taps apart found they are the type with flat corks top and bottom and the slider in between, corks were completely knackered so have ordered new ones. Didn't try boiling the forks as I don't have a big enough pan but thanks anyway.

Member
User avatar
Posts: 870
Joined: Thu Nov 12, 2015 2:22 pm
Location: Florida, USA

Re: Leaky petrol taps.

Postby Expat » Wed Mar 25, 2020 1:58 pm

MalcW wrote:
electrajohnt wrote:Stick with what you have got and boil the forks or put new ones in.


How does boiling the forks help? :D

Malc


He meant boil the forking corks :D
Keep shiny side up.

These are my principles, if you don’t like them, I have others. (Groucho Marx)

Member
Posts: 306
Joined: Tue May 27, 2003 12:00 am
Location: SHROPSHIRE UK

Re: Leaky petrol taps.

Postby bitza » Wed Mar 25, 2020 3:44 pm

On rebuilding the taps do not overtighten the tap body to the ends if they are brass it's easy to split them, same when screwing them into the tank , don't use a spanner on the body, use a thin spanner on end nearest tank,

Next

Return to G12 / AJS Model 31

Who is online

Users browsing this forum: Duncan, StewartR and 4 guests