(Their machines actually OEMed from MTD? or is that just in the US?)Īnyway, I'll have a look inside the carb when I get a chance. They like to stress the relationship with Husqvarna but in reality it appears McCulloch have changed hands a few times, and now just sit as a budget brand within the Electrolux group. They used to be one of the "Big Names" in this type of gear, but I think that nowadays they're right at the bottom of the cheap market. The old McCulloch is quite a good bit of kit, if only I could sort out this fuelling issue. We ended up just returning it for a refund, hence soldiering on with the old one. In contrast last year we bought a replacement, and it never ran right - McCulloch wouldn't even provide carburettor settings or any sort of service information, and said we'd need to take it to a dealer in Dundee for them to look at. I haven't been able to find one marketed for the MT320 which as I said is long discontinued.īy the way, is it just me or are McCulloch pretty much a dead loss nowadays? I remember getting assistance from them when we first got this strimmer. I need to find that again, because I think I might have a chance of finding the correct kit by carburettor model. I'm sure I had one, and that the part number given for the carb suggested it was Zama. I cleaned with meths (which is pretty good at removing varnish from petrol), and blew through everything.Īnnoyingly I can't find the parts list now. I took out the needle and spring etc, but I can't remember a gauze filter so I might have missed that. Thanks, that's correct there were two diaphragms in the carb, one under each of the side covers. The machine is no longer supported by McCulloch so I don't know how easy it will be to find a compatible repair kit or replacement carburettor, so I'd like to see if I can understand the issue before searching for bits. I had the carb in bits and I'm pretty sure none of it's passages are blocked, so is it possible that the fault is caused by a leak elsewhere or by a stiffened or distorted diaphragm? My question is about this "H" adjustment, which I believe controls fuel flow at high speed. I can get it to rev properly by unscrewing the "L" screw further, but then it won't tick over so that's clearly wrong.
The "H" screw makes no difference at all whether fully open or fully closed. If I get it running nicely at tick over, it won't rev up properly. I've fitted a new plug as a precaution, and cleaned the air filter before trying to adjust the carb. Recently it's been giving trouble, getting hard to start and not running well. The handbook gives quite clear direction on carburettor adjustments which are the normal idle speed, "L" and "H" screws as found on similar small engines. We have a McCulloch MT320 strimmer, not sure of the age but probably over 10 years old.