Alf Stewart wrote:Got all the jets clear, reinstalled and assembled. It lives!!!
Alf Stewart wrote:I may or may not have tweeked the idle setting a tad but a fraction of a turn at most. Better not have sucked some shit into the pilots haha.
My guess is your settings are pretty close.
Shit getting back into the carbys is a risk. Can you see any rust in the tank?
Alf Stewart wrote:I'm thinking I may need to adjust the pilot screws on the carbs? I reset them all to 2 turns out as per manual. I checked the, before setting and they varied from 2 through to 2 and a 1/4 turns out. Possible this is my issue?
If you can get it to start and run fairly smooth then the settings are good enough to start with.
Cutting out may be a fuel feed issue. This can be split into 2 different areas. You can have a tank venting issue. On a gravity fuel feed the air has to get into the tank to let the fuel out. The fuel can flow ok for a while as engine heat makes the air and fuel in the tank expand and make a bit of pressure but after a while that is not enough. I had to fiddle a bit with the venting valves in the fuel cap of the Resurrection GPX after it cut out a couple of times on the road.
If you have a tank venting issue then if you leave the tank cap open then the problem should go away.
If rust or stale fuel shit is clogging the tank pickup or filter or (in your case) the fuel pump, or the T-piece where the fuel hose meets the carby bank, then that is something else.
This where seeing the float level can help. You would see the float level drop before it cuts out.
Also depends on how it cuts out. Does it feel like it is running out of fuel or does it stop dead like you turned the switch off?
If it is a sudden stop then electrical issues may be at play e.g. a CDI unit heating up and cutting spark.
Alf Stewart wrote:How do I determine if it is running rich or lean?
The old old school way (and cheap) is to look at the colour of the deposits on the spark plugs, although on a bike there is a time cost if you have to piss about taking the tank off.
The not quite as cheap old school way is to use a Colortune spark plug with suitable adapter. It is basically a glass spark plug that lets you see the colour of the combustion. I have a couple that I have had for about 30 years. They came in handy setting up SU's on modified Minis.
Alf Stewart wrote:Little stumped as to why it revved great, then not at all.
Ah, well, if we knew that we could tell you what to fix.