James Sawyer
ArboristSite Operative
I'm new to the site, learning a lot from this group. I have a 034AV that had some issues , which originally started this project. I've since fixed the original problems (Fuel/ Carb) but at the time I thought it needed rebuild since it was last produced in early 90's. This has evolved into more of an performance upgrade/fun project since I already bought the rebuild parts. It’s the only way to justify the cost of the tooling & additional parts is to turn this into a learning experience. I purchased aftermarket cylinder 48mm to replace the original 46mm stock Stihl. Basically I kept the same cylinder timing, widening the intake and the exhaust to flow match. The ports at the cylinder wall I cleaned up just enough to improve the transfers not opening much more than originally casted. It was surprising how much restriction the exhaust had between the muffler and cylinder. I used the exhaust gasket as template for the end results. My next project is to match the baffle area to the exhaust port cylinder wall area. I order the husky deflector and screen but I think I’m going design a slide plate to adjust the exhaust opening when tuning this to performance. I hoping to a get a back pressure reading so I’d have reference on a ball park value to use on other saws. I have a 034 super…hope this 034AV runs better guess we'll see. Please see the attached photo if interested.