SOHC.co.uk Forums > CB500/550

Cold misfire

<< < (3/3)

Johnny4428:
That’s interesting Nigel, and might go a little way towards the explaining zero resistance on old plug caps. I had two on the 750 but the bike definitely wasn’t running on two cylinders only. This was prior to replacing plug caps and refurbing old coils.

K2-K6:
Yes, interesting that they'll "work" with significant problems in them.

Of course if you check resistance at low voltage through the cap it will often show toward open circuit if compromised inside. The HT will just jump that gap though when in use without real problem, as long as it can't escape to earth on the way to the plug then it may not be apparent in use under many circumstances.

Obvious here is the car system of distributor where the rotor arm to distributor cap transmission is made on the fly as it rotates, with a gap between the two as well. It's really not a significant problem in the grand scheme of things, although you'd not check a car system through that cap/rotor joint but just the descreet leads to assess resistance of each component. Given a little condensate inside the cap though, and it'll be tracking all over the place.

It's not commonly considered, but the spark duration shifts constantly based on the conductivity of the combustion atmosphere and compression effects etc. There's interaction with this aspect and HTsystem resistance that affects combustion, but not a topic for discussion on thus forum  :)

Navigation

[0] Message Index

[*] Previous page