They notch cooling fins on Harleys and most all big bikes I know of...
And well come to think of it, it would look neat, especially on a painted jug.
What does everyone think?
Hi Fellow ZOnie.
How about our AZ Card's ehh?
3-0 with a 2 game lead in our division.
Anyway, slots in your cylinder fins won't hurt anything nor will they help any.
The majority of heat dissipation is done via the head, which is regulated by the heat number on the spark plug.
I am no fan of high compression heads even for $40.
What I do is put in a bit longer NGK spark plug which adds a bit more compression itself and only $10, but you need to get the Heat Index Number right.
It works like this; the higher the middle number in the plug number, the more heat is dissipated from the engine.
The general rule is use the highest number you can run until it runs so cold you foul plugs, it's heat that burns the deposits out and your engine likes running plenty warm.
Heck, I even paint most heads with High Temp black paint which really hampers cooling, but I run NGK 5944 (BPR
7HIX) Iridium spark plugs in all my 2-stroke builds for here in the valley even in summer with no heat issues.
This time of year you may need to warm up to a 6 just keep your engine hot enough to not foul the plug.
I hope that helps you understand how heat is transferred out and the importance of keeping some in.