OutdoorKing Repair Forum Forums Repairs and Maintenance Questions On Hand Held Blowers/Vacuums McCulloch Blowers & Vac's Mc culloch blower not starting

My blower is not starting. What maintenance can i do myself to get it going please?


By deezalboy

^ what he said ^

I agree with drjbeam and Joe. So just follow what they have suggested and let us know how you get on.

Thank You. I assume the filter your`e referring to is the felt one under the black cover, how do i clean that please?? The primer bubble is old and is not clear, so i`ll get another one, and the plug is new.

My blower is now starting after doing what you said "new plug- new primer bubble-clean filter". I couldn`t see any fuel in the bubble, should there be? How are the two screws adjusted( photo attached) when required? Thanks


By deezalboy

Should i see fuel in the bubble when i prime it and are the screws for high and low speed??

I don`t dare clean it i might upset it. As long as it works.

In my experience there is normally fuel in the primer bulb. Perhaps you have an air bubble temporarily trapped in it - this may cure itself when you've used it a few times. If you make a note or diagram of the way the screwdriver slots in the jet screws are aligned before you clean the carburettor, then clean it fairly gently with a paintbrush, you can check that they haven't moved (which is unlikely to happen anyway). To tell you which of those screws is slow speed and which is high speed, we would have to know what make and model of carburetor it is - and that would be easier to figure out if it were clean.

The fuel is now in the bubble. I degreased the carby as best i could. A photo is attached so it may not be clear enough. The machine is a MC Culloch Super Airstream iv blower vac
By deezalboy

I have tried to expand the image of your carburetor, in the hope that someone may be able to nominate the manufacturer and model. I don't recognize it - most likely it is some model of Walbro, Tillotson, or Zama. If you have the operator's manual for the equipment it will probably tell you how to adjust the mixture. If it doesn't, it will be in the carburetor manual, which is probably available on this site.

If you can't get this information, you can make a generic tuning adjustment as follows. One of the two screws in the picture will be low speed, the other high speed. The usual approach is to begin by carefully noting the current setting on each screw (that is, you note the angle of the screw slot, then turn the screw clockwise gently until it bottoms, noting how far it rotates. Then you put it back exactly to its current position.) Second step is to run the motor with the throttle set in the start position, and adjust one of the screws (I'd start with the one on the right, but I could be wrong) and find when it runs fastest and most smoothly. Find the leanest (clockwise rotation) and richest (anticlockwise rotation) settings before it starts to run worse, then set it halfway between them. If this adjustment makes hardly any difference, return it carefully to its original position then switch to the other screw - it must have been the slow-running mixture, not the high speed mixture. When you have got it running as well as possible at high speed, release the throttle from the start position, and set the other screw to give the best idle you can get. If you had to adjust the idle screw very much, recheck the fast-running screw afterward.

I emailed Walbro with a photo of the carby and their reply is as follows>>>

Looks like a Walbro

Luis Salas
Program Manager - Aftermarket
Walbro Engine Management
6242-A Garfield Avenue
Cass City, MI 48726
p. 989.872.7322
f. 989.872.1135

terrace,

The carby should be a zama and in your picture you should see the letter 'C' plus others where the throttle control fits to the carby (below the metal lever in the body). Once you have the letters and number we will know what kit you need if any.

Thanks, i had a look for that and the only thing i can make out is "hong kong" near the right screw in my picture. It starts anyway so i`ll play it by ear until i have to go further.

The MC Culloch Corporation Tucson, Arizona website shows the MC Culloch Super Airstream IV blower/vac has a Zama carburretor part 222937-Zama M21, but the numbers may be different here of course. For interest sake i`m attaching a screenshot of the carburettor assembly.

http://img694.imageshack.us/img694/565/carbyretta.jpg