Pinking (pinging)

[orabanda]

For my rigid AND plunger framed engines, we found on the dyno runs, that a B7Hs in the left cylinder and B6HS in the right cylinder, was the best combination. The hotter plug in the RH side helped correct the richness on that side that all of my A10's seem to have. An induction bias (tapered) spacer between the carb and head also helped. Both of these actions helped to even up the mixture in both pots.
Richard

[trevinoz]

Richard,
             Have you thought about having a head gas flowed to see what is happening?
Possibly a little work on the ports may cure the induction bias.

     Trev.

[orabanda]

Hi Trevor,
You have raised this very good point before, but I will not bother unless I have to remove the heads from the engines.
However, I will go to the trouble next engine I re-build.
Thanks for the tip,
Richard

[muskrat]

I agree t20, our bikes do run better on colder plugs with the modern wee water. The only down side is they can be a little harder to start when cold, and when started must be run up to temp. If started and stopped as soon as the choke is off plugs will foul.
 I'm running 9's in mine and backed off the timing to 28 degrees as well as a super rich mix and it still pings. I do as Rich and throw her back a gear or two.
Cheers