Starting Issue

Information relating to the Matchless G2 or AJS Model 14 250cc Lightweight
SPRIDDLER
Member
Posts: 8542
Joined: Wed Sep 01, 2004 1:00 am
Location: WEST SUSSEX UK

Re: Starting Issue

Post by SPRIDDLER »

dada wrote:I filled up the float camber with a siringe from bleeding valve.........
Not sure where you found the 'bleeding valve'. Are you referring to the float tickler?
You mentioned filling the float bowl with a syringe. Was there no fuel getting there already?
Also check that after the rebuild you have set up the valve timing correctly.
If you place your hand over the carb mouth you should feel suction on the inlet stroke.

EDIT: (Wrong link given - now deleted :oops: )
Last edited by SPRIDDLER on Thu May 02, 2019 2:39 pm, edited 2 times in total.
'There is a tide in the affairs of men
Which taken at the flood............'
Mick D
Posts: 2886
Joined: Mon Mar 24, 2014 5:44 pm
Location: Aberdeenshire

Re: Starting Issue

Post by Mick D »

Hi

If you have a syringe try opening the throttle slide and dripping five drops of fuel into the carb near the needle valve, (but not down the needle jet), almost close the throttle slide and kick the engine over - did it fire?

If yes you probably have a fuel blockage - undo the carb banjo with the fuel selected on - does fuel leak out? Yes - blockage is in the carb

If not repeat the process a couple of times more - did it fire? - Yes see above.

If not confirm you have a spark and that the plug is now wet.

Plug dry - check for blockage in the tank system, (tap strainer / tap / fuel pipe).

No spark - fault find ignition system

If yes to both you most probably have a timing issue. It is easier to check the ignition timing than valve so go there first.

When setting the ignition timing ensure you are on the compression stroke.

Have fun getting to know the bike, all good experience for if/when it breaks down on a run ;)

Regards Mick
dada
Posts: 99
Joined: Tue Apr 10, 2018 10:43 pm
Location: Malta

Re: Starting Issue

Post by dada »

Thanks to all for assistance will try and keep you posted
dada
Posts: 99
Joined: Tue Apr 10, 2018 10:43 pm
Location: Malta

Re: Starting Issue

Post by dada »

Can I use that timing guide for lightweight as it is for heavy weight
Mick D
Posts: 2886
Joined: Mon Mar 24, 2014 5:44 pm
Location: Aberdeenshire

Re: Starting Issue

Post by Mick D »

Hi

LW ignition timing is detailed on pg 40 of the 57-64 Workshop Instruction Manual, valve timing pg 41.

Regards Mick
User avatar
Ozmadman
Posts: 2651
Joined: Wed Dec 14, 2011 1:02 am
Location: ESSEX UK

Re: Starting Issue

Post by Ozmadman »

dada wrote:Can I use that timing guide for lightweight as it is for heavy weight
Easy way to do the timing.. Get a piece of thickish wire and put a small bend in the top (so it won't drop down the plug hole!) set the engine a TDC (comp stroke both valves closed so the rods are loose) put the wire into the plug hole until it touches the top of the piston and mark it. Take it out and measure one quarter of an inch ABOVE your first mark and make a second mark, this will indicate 1/4" BTDC. Wind the engine back a bit and then forward again to bring the piston up to 1/4" BTDC using the upper mark on your wire. Turn the ADV/RTD unit fully advanced and wedge it open with something then adjust your points until they are just open (I use a multi-meter with a buzzer on it set to continuity which will stop buzzing as soon as the points open) better than a fag paper. Don't forget to remove the wedge from the ADV/RTD unit.
Paul
1960 Model 8
1974 Yamaha RD250B US Model 6 speed
SPRIDDLER
Member
Posts: 8542
Joined: Wed Sep 01, 2004 1:00 am
Location: WEST SUSSEX UK

Re: Starting Issue

Post by SPRIDDLER »

dada wrote:Can I use that timing guide for lightweight as it is for heavy weight
:oops: No. (Apologies. My brain automatically thinks Heavyweight engines).
'There is a tide in the affairs of men
Which taken at the flood............'
dada
Posts: 99
Joined: Tue Apr 10, 2018 10:43 pm
Location: Malta

Re: Starting Issue

Post by dada »

Will do after I check carb
dada
Posts: 99
Joined: Tue Apr 10, 2018 10:43 pm
Location: Malta

Re: Starting Issue

Post by dada »

Which product best to clean carb ?
User avatar
Ozmadman
Posts: 2651
Joined: Wed Dec 14, 2011 1:02 am
Location: ESSEX UK

Re: Starting Issue

Post by Ozmadman »

dada wrote:Which product best to clean carb ?
Probably best to dismantle it and clean it properly to make sure every tiny hole is clear. Other than that there are a variety of spray "carb cleaners" on the market, can't see there would be much to choose between them
Paul
1960 Model 8
1974 Yamaha RD250B US Model 6 speed
Locked