C15 misfire

[phill]

Hi,
     C15 trouble again - sorry. I am getting a persistent misfire at all revs. I have changed the plug (NGK B7ES 23 thou gap),plug cap, condenser. Points ignition fitted with a regulator/rectifier from Rex Caunt racing. I have set up the points to the correct gap and set the tappet adjustment (although I struggled with getting the piston in the right place). I'm not sure about the ignition timing - I can't see how the procedure described in the manual (knitting needle down plug hole etc) can be very accurate. Any ideas would be gratefully received.


Phil

[Dean Southall]

How old is the fuel?

[ducati2242]

The only thing left is the coil , which can cause a misfire , or the petrol . My guess would be the coil .

[ducati2242]

forgot to ask is it distributer or side points ignition .

[phill]

Hi,
        Distributor ignition, new fuel, bike starts very easily.

[ducati2242]

have you another coil you could try then .

[phill]

no I'm afraid not - I'll see if I can get one

[JulianS]

Is it set too rich?

Is it flooding?

What does the plug look like?

[phill]

No flooding. Plug looks OK

[phill]

Have now fitted new coil but has made no difference. Looking for ideas.
Phil

[DerekAnderson8]

is the ignition timing retarded, if the bike starts easily but doesn't want to rev it may not be correct, does adjusting the timing make any difference to misfiring?

Does the engine idle ok or have you got to keep it going with throtttle?

cheers

derek

[phill]

Hi,
         Idles OK. Altering the timing by turning distributor body makes no difference to misfire. I've uploaded a video to Youtube  - VBO977. I thought this would be better than trying to describe what it's doing.


Phil

[ANDY HIGHAM]

90% of all ignition problems are carb related

[phill]

I've just had the carb off and cleaned it out again. All looks good but no difference.

[ducati2242]

I know you have already changed it but was it the same with the old condenser in . Does sound like the condenser is breaking down on your youtube link.