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This is where and why I break my engines in the way I do, this is from the manual that comes with the K&B 3.5cc rear exhaust engines (It's actually a front exhaust engine but we call them rear as the exhaust points rearward) when in a boat. notice the break in procedure. Pic is of the engine...

Oh it's a new engine, new engines blow plugs, just part of the hobby. Do as the manual says for break in. Don't listen to what I am about to say. I don't break my engines in. I run them on the fuel I will use in the engine, I set the needle valve to just a fine hair rich and run them flat out...

I have been using KB and HP plugs for 40 plus years they are robust to say the least. When I do use random OS or other plugs, they get mangled. FOX makes some really good plugs too, I think K&B manufactured FOX plugs too. Mecoa is K&B, Mecoa bought K&B a long time ago. The 3.3 engines have...

here is a link to the mecoa plug page. http://www.mecoa.com/acc/glowplug/glowplug.htm In the pic I supplied the top two plugs are K&B HP plugs, the bottom plugs are K&B idle bar plugs. mecoa has a wealth of general info if you look around the web sight. Plus a wealth of parts too.

In my 4tech 3.3, (Highly modified engine) 12,000 squish band height, timing, opened up boost ports, narrowed con rod, skirted piston, drilled through crank weight "To throw fuel up into the case", stuff like that. Anyways, I ran 30% and 40% FHS Oils Red Max fuel and blew OS max plugs all the...