Non starting G2 - New owner seeks help.

Information relating to the Matchless G2 or AJS Model 14 250cc Lightweight
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Non starting G2 - New owner seeks help.

Postby mn757 » Sun Mar 22, 2009 10:25 am

Hi,

I've just bought my first classic bike and its ground to a halt after two days of trouble free riding. It miss-fired a couple of times and then refused to start. I pushed it home and noticed that the bolt the goes through the points cam had come loose. I wondered if this was stopping the points opening / closing but they seemed ok. I have a nice spark at the plugs after checking the points gap, I have fuel getting to cylinder but still it refuses to go.

The two screws that secure / adjust the timing seems to be tight so I dont think the timings out, I did wonder if the points cam had moved out of position (I notice it can fit two ways round) but it seems ok. I'm running out of ideas now and wondered if anyone could offer suggestions.

I have a nice 6 volts at the lead which connects to the points, and the points look healthy (no pitting) and I have swapped the condensor to no avail.

It's a great bike and I cant wait to get out on it again.

Any help greatly appreciated,

thanks

Martin.

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Non starting G2 - New owner seeks help.

Postby chris kelly » Sun Mar 22, 2009 11:26 am


Hi Martin,
Welcome. What year is your G2 please?

Also what spark plug are you using....I know that you are getting a good spark...I am just thinking of a situation I had on my AJS14, 1966 Model.

Best wishes,
Chris.
'My cat can beat up your cat!'

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Non starting G2 - New owner seeks help.

Postby itma » Sun Mar 22, 2009 1:37 pm

If the centre bolt has come out I think you can take it as read that the timing has also gone up the swannee.
re time it and try again

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Non starting G2 - New owner seeks help.

Postby mn757 » Sun Mar 22, 2009 4:06 pm

Hi, thanks for replies. It's a 1960 model. I'm using a BP7S spark plug from memory. I was hoping the timing wasn't going to need resetting, it looks a bit awkward. Does the central bolt do anything other than hold the points cam ?

many thanks

Martin.

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Non starting G2 - New owner seeks help.

Postby davehutch » Sun Mar 22, 2009 5:32 pm

quote:

Hi, thanks for replies. It's a 1960 model. I'm using a BP7S spark plug from memory. I was hoping the timing wasn't going to need resetting, it looks a bit awkward. Does the central bolt do anything other than hold the points cam ?

many thanks

Martin.


It just holds the point cam
----Only a biker knows why a dog sticks his head out of a car window.

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Non starting G2 - New owner seeks help.

Postby chris kelly » Mon Mar 23, 2009 9:38 am


Hi,

Okay, I had just thought your bike might have been a later CSR.


Presume you have access to manual....and withdrawal bolt part number 042247 if you intend to remove the unit to reset ignition timing.

Just noticed a ''note '', in my literature, ''The contact breaker cam is detachable and if it is inadvertently removed, the timing should be rechecked after refitting the cam, before attempting to start the engine''

So, it looks like Ken was correct first time !

Chris.
'My cat can beat up your cat!'

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Non starting G2 - New owner seeks help.

Postby Wavy » Mon Mar 23, 2009 8:04 pm

It may be a coincidence but have you cleaned the point contacts thoroughly?

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Non starting G2 - New owner seeks help.

Postby Branston » Mon Mar 23, 2009 9:05 pm

Assuming ignition side is OK, have you checked the carb jets? maybe a foreign body has blocked one of them, (usually the pilot jet). Also its worth draining the carb carefully into a cup and checking for water. Sometimes a small globule of water will be enough to block the jets.(But if you find any water in there you will need to drain the tank and dry it out.)
Good luck
RJG

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Non starting G2 - New owner seeks help.

Postby mn757 » Tue Mar 24, 2009 12:18 pm

Thanks for the suggestions. I'm have ordered a workshop manual and also a new set of points, plug, coil, condenser.

I suspect it's a timing issue, or fueling issue. The plug is getting very wet with fuel so I wonder if its too rich for some reason. Had the float chamber apart and the fuel looks ok.

What I havent worked out yet (in the absence of the manual) is how to set the timing. I can see that the base plate is adjustable on the screws at the side, but the handbook mentions you have to insert a screwdriver into the 5/16th hole to seperate the bob weights.

It also says you need to remove the 'assembly' using a separate tool/bolt - but I cant see why this is needed. I'll have a good read of the book when it arrives and hopefully that will reveal all.

many thanks

Martin.


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Non starting G2 - New owner seeks help.

Postby davehutch » Tue Mar 24, 2009 5:05 pm

Hi mn757,
I also have a 1960 g2, You need to set the timing 1/4 in B.T.D.C Put a wire through the spark plug hole then turn the engine to find T.D.C., Then make a mark on the wire then take it out make a mark 1/4 in above that mark. Put it back in and turn the engine backwards untill 1/4 in mark. If you put a small screwdriver through the hole in the bottom right of the base plate and open the 2 bob weights the poins should just open. If they don't move the back plate untill they do . Hope this is of help cheers Dave
----Only a biker knows why a dog sticks his head out of a car window.

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