Premix debate?
I recently bought and ran a tank of fuel through an Ebay 58cc brush cutter.
The Chinese instructions call for a 25:1 premix. I've never run any two cycle engine I've owned that rich but the instructions
called for it.
I've had several two cycle dirt bikes and I run 40:1 in my Indian built moped; have for years. No saw, weed whacker, or anything I've owned or used has ever gotten 25:1 put in it. I've used the $1,000+ Stihl brush cutters but can't justify that cost for home use so bought this Chinese thing. All I have are ~25cc trimmers at home and they don't have enough power for the thick stuff even though I run a dado blade on one but it take some finesse and will stall in the thicker stuff. That's a total home brew contraption.
I don't know about the claimed 58cc but for the price it's a beast. It felt a little weak at first but after a tank of fuel it loosened up. Most of the plastic on it is very cheap but the engine is strong. Like a proper brush cutter, boots, pants, gloves, and a face shield are needed or it'll draw blood (already has). I bought some .105 line for it today but I think it came with something larger. My digital caliper battery was dead and I couldn't measure the line it came with. Nothing in the instructions or on the two trimmer heads it came with say anything about line size. It came with two different style blades but I have a tractor and brush cutter for any mess like that so I'm keeping the line trimmer head on it for now.
So, about fuel premix, I'm running a large line trimmer head. That's sustained RPM and not blipping through tree saplings or a whole lot of woody stuff. I've got a pole saw for that if not wanting to fire up the tractor. I bought this for very thick grass and weeds, like ditches and pond banks I haven't touched in a month. During the summer which is always above 90 degrees and high humidity so I get out in early morning with the grass still wet with dew.
The thing just splooges out the muffler with the current mix and pours smoke. I use VP synthetic oil and that premix seems very wrong for modern synthetic oil.
I'm going to run 32:1 after I use up what I've already mixed.
Has anyone else bought and used one of these brush cutters for an extended time and used a different premix?
I don't plan on using 50:1 but 40:1 may actually be alright with modern synthetic oil when really working the cutter hard.
?