SOHC.co.uk Forums > CB750

jumping ...missing and backfiring

<< < (3/8) > >>

Johnwebley:
I recently replaced the plug caps on my 500,as the resistance had increase to sky high rating,

 age and use does cause the caps to burn out,

for less then £20 a set,worth getting new,

mike the bike:
Think of a coil like a transformer; it has 2 coils,a primary and a secondary..
The primary (yellow to black white and blue to black white for the other coil) is around 5 ohms.
The secondary (from one HT lead to the other) is around 15k.
There should be no resistance between yellow and a Ht lead, they're not connected at all.

Bryanj:
The vid is probably a single output coil where the other end of the HT is earth or frequently the points side of the LT side. The Honda twin output coils have LT and HT as two seperate insulated windings so second test needs to be between the two HT leads on the same coil.

Weak spark is common if cap is going high resistance ALSO id resistor plugs are used with reietor caps

billy192:
New ngk caps but thanks I will do new checks this Friday


Sent from my iPhone using Tapatalk

Sparrow1:
Hi Billy,
  I would look very closely at potential air leaks. These are very similar symptoms on my 750 and found the inlet tube/s weren't sealed properly. They were, in fact, the wrong ones!! Lower the demand on the engine the poorer it ran. Particularly around town. I sprayed a soapy liquid onto the tubes and area it which should be sealed and the engine picked up and ran sweetly for a second or two on no's 1/2. Those tubes were incorrect and one was split.
   I hope this may be a more simple solution and fingers crossed for you.
    Nige.

Navigation

[0] Message Index

[#] Next page

[*] Previous page