SOURCE: How to adjust the carb on a McCulloch super
There is no set adjustment on any blower or chain saw. If it were that simple there would be no need for adjustments. The problem is that most equipment manufactured in the past 10 years can not be adjusted by the user. Carburetors are now equipped with either adjustment limiters which limit the adjustment to less than half a turn or with adjustment screws that require a special tool to make the
adjustment. More than likely you will have to take it to an authorized dealer for those adjustments.
If you do have an adjustable carburetor, then gently close both needles and open each on 1 full turn. This should allow the engine to start and the final adjustments can be made at that point. If it still will not start then open each needle 1/8 to 1/4 turn and try again. If this still does not work then most likely your carburetor needs a good cleaning and a rebuild kit.
SOURCE: need tool to adjust small
Sellers on Ebay have the tool. Of course you have to register as a member to buy. The tool is not readily available at small engine repair shops or hardware stores as the manufacturers don't want us to mess with the "lean" settings required per EPA emissions rules (esp. in California). If you don't use Ebay, there are other ways to "turn" those little splined mixture screws. I use wire plastic wire terminal connectors (ring type and splice-connecting type). I tap the ends of the wire connectors (not wire nuts, mind you) over the heads of the screws until tight and proceed from there. The wire connectors I use I think fit 22 gauge wire. If you take them out, cut slots in the heads so they can be turned with a conventional screwdriver. This is a very, very cheap alternative to buying a tool. Small, soft brass or aluminum tubing (found at hardware stores and big box stores) can also be forced down over the heads of the screws. I will include a link to the tools on Ebay and a link on how to adjust the carburetor using the 2 (L and H) adjusting needles.
Ebay Link: http://tinyurl.com/3yuybuf
Carburetor Link: http://www.zamacarb.com/tipspage.html
SOURCE: McCulloch 28cc Gas Blower MB3200,
The primer should pull fuel out of the carb, into the bulb and dump it back to the tank, if the fuel filter in the tank is blocked, or the fuel hose is split no fuel will enter the carb, so the primer will not fill, replace the filter and the fuel hose.
SOURCE: ECHO PB-250 blower new used one time carb.needs
Your machine has a rotary-valve diaphragm type carburetor. These carburetors typically only have an adjustment for the IDLE speed with an available option to control the main jet with an adjustable mixture needle.
http://www.echo-usa.com/Products/Blowers/PB-250
Here is the info on the Zama rotary-valve diaphragm carburetor.
http://www.zamacarb.com/prodlist.html#RB
Some have a small adjustment needle in the center pivot of the rotory part, under a brass plug...but most have nothing. Many end users and techs are complaining about the non-adjustable carbs. They are made this way to meet the more stringent EPA emissions codes that are getting tougher each year.
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