Honda Spree and Elite 50 Forums

So I did the first plug chop with the 48mm BBK on the 86 spree. I'm running stock oil pump and 40 to 1 in the tank. I have 4 1'' holes in the stock air box with a freshly oiled stock filter. Running a 100 main jet. Looks lean to me. Runs great at 3/4 throttle, not so great at full. Ran for about 30 seconds at full bore on a fresh plug. Below are the results. What do ya'll think?
Larry

Looks lean to me too. You need to mark the plug so you know which way it is facing in the cylinder. So we can determine what the plug is tell us overall.

step up a jet and do another chop

which way exactaly should the plug face

nitroelite419 wrote:which way exactaly should the plug face

It doesn't matter for operation (at least in street engine operation) but for you to know what side faces the exhaust port. Then the side that is colored will let us know what is happening in the cylinder during combustion.