Chainsaw Repair
Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Stihl => Topic started by: aclarke on September 11, 2014, 05:30:04 pm
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Picked up a ms261c the other day and pulled the carb (C1Q s229) off to get an idea of how the fuel is being metered. Thought it had a Throttle position sensor but the position sensor is hooked up to the choke shaft. There is a small electronic metering device the us fe via two feeder holes under the metering diaphragm. Looks like the metering unit regulates high speed and low speed, although there is a fixed brass inlet orifice leading from the metering unit to the low speed Welch cavity. I'll put a multimeter on the choke shaft position sensor and check if its varying current to the fuel regulator or if it's simply an on/off swith for the metering unit.
Anyone else get a grasp on this carb yet? Seems pretty simple so far