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I have one of those cheapy timing lights that is just an in-line connection - no external power supply. So, it performs a dual purpose of doing this test as well, and you can place it where you can see it without standing over the engine (for example, lie it on the panel in front of the windscreen to see it when trying to start the engine).
Those spark indicators are really useful but if its a slight misfire I dont think it will show up on that.
Apparently the vacuum gague test can be really helpful to find a sticking valve or even an ignition problem. You watch the way the needle jumps about and you can tell from that. Not tried it but check this video out http://www.youtube.com/watch?v=NrnzD7PgoHI
Cheers Ian
Have you tried what chris found on you tube
vince
Only in my College days Vince, It make be worth finding a local Garage with a Scope, they should then be able to tell you where the problem is if it's an ignition issue. Like Martin suggested Plugs are cheap start there. just because they are newish means nothing also check the dizzy cap for hair line cracks or signs of tracking.
Ian.
Wise men ignore the advice of fools, but fools ignore the advice of wise men sigpic
For vac gauge test they explain on the video where you should pick up a 'proper' vacuum signal. The best place on the stag is the pipe to the air filter flap. put a tee off in there. Its worth buying a tee pipe adapter so you can leave it there blanked off with a cap. Then connect the vac gauge when you need it. This technique can also be useful for tuning carb mixture (tune for max idle vac).
When I get 'a round tuit' I will do that myself and let you know how I get on.
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