4 Stroking definition help

[Scrat]

Could you guys clearly define "4 stroking" in regard to tuning. The term is not clear to me. I just did an exhaust modification to a Husqvarna 334T and adjusted the carb. The Tach says it is running at 13,600 with great throttle response and very smooth at that RPM, no lugging or any issues even with the bar fully burried in a piece of Red Oak. I am posting it in this area because I would like a professional answer. Thanks in advance for your responses

 

[isaaccarlson]

4-stroking is the blurble you hear when you turn the H screw from lean to rich. If you start out lean and richen it up you will hear the rpm drop(sometimes) and the sound will get rough.

 

[Scrat]

So what you are saying is when setting the High speed jet you want to take it just past peek smooth and fatten it just to where it "blurbles" and may loose a few RPM but it will be just a hair on the rich side for safety.

 

[isaaccarlson]

yep
just a bit of burble. it should clean up and get smooth in the cut.

 

[oscar4883]

http://www.youtube.com/user/blsnelling#p/u/113/7jYUotkZorg