I hope this isn't too far off topic. Have inherited a lawnmower with Briggs & Stratton Quantum 1cyl petrol engine. Engine has an oil dip stick and oil filler. Plate on mower (not engine) says 2 stroke. I've never before come across a 2 stroke petrol with circulated oil lubrication before. Do I use 2 stroke fuel or neat petrol? Thanks Nick.
Not car related but to do with 2 stroke engine
Jun 03, 2007
14 Replies
"Nick" wrote
Hi Nick, how old would you say this lawn mower was? IME, most lawnmowers have a 2-stroke engine but run on neat petrol, using a "flicker spoon" mounted on the main bearing cap to splash oil around the cylinder wall from below, rather than mixing oil with the petrol.
B& S use a thinly disguised version of the Suffolk engine so I doubt if it is radically different.
two stroke , the filler and dipstick may well be lubing other areas of the machine
most mowers are now 4 stroke , the suffolk my dad had was 4 stroke (early seventies) the briggs on my old mower was 4 stroke
I'd be tempted to go down to your nearest lanmower sales place and have a look at similar engines. I've only come across 4 stroke B&S engines before so I'd be wary of the plate information.
You could just fire it up and listen to it. 2 & 4 stroke engines sound quite different.
Tim
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Has it got valves?
The message from Boris The Spider contains these words:
If it's an L-head it's not always easy to tell at a glance.
Mine's 4 stroke and has a separate dipstick/filler for the transmission oil.
nick i worked on a golf course for a long time using same kind of 2 stroke mowers there is no need to mix oil with fuel just carry on using it with no mix may need to add a lead replacement every now and agin though in the fuel
hope this helps
And the lead replacement would be for what exactly?
Somehow I doubt it...
Chris
DONT!!!
You will knacker it. What did you base your advice on?
Perhaps on the fact that maybe his mowers are actually 4 stroke (in which case the advice would make some sense).
Tim
The message from "Matt" contains these words:
Not having to pay for the repairs, I suspect.
If it really is two-stroke, which I doubt if it's a Briggs and Stratton engine then it'll either have an auto-oiler tank which you fill and it doses the inlet for you, or you have to use premix. Failing to do at least something about the oil will kill a 2-stroke very rapidly.
But he's giving incorrect advice based on 2 Stroke.
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