Phew!
Lawnmower
- Thread starter wozz
- Start date
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sidewinder, we use plugs at almost
I realise the cost of race plugs mate, but for a B&S agricultural engine!
TBH the bloke was helpful with and the shop doesnt look like it earns a great deal, he gave me a fair bit of helpful advice and was also the same when my dad used to go in there after breaking various things, so wasnt worried about a few quid here and there. His words echoed M107s earlier in the thread nearly word for word!
Sorry to keep picking your brains lads but...
Today started it from cold, started first time well happy. Problem is it seems to run flat out for about two minutes very noisy, then all of a sudden drops to a idle that seems a bit slow, I havnt tried cutting grass yet but a bit worried it may stall when cutting grass the choke has no effect as the govenor acts on the same thing but overrides it.
I can live with it if it can cut grass but surely cant be too good for it running flat out from cold! any ideas?
Today started it from cold, started first time well happy. Problem is it seems to run flat out for about two minutes very noisy, then all of a sudden drops to a idle that seems a bit slow, I havnt tried cutting grass yet but a bit worried it may stall when cutting grass the choke has no effect as the govenor acts on the same thing but overrides it.
I can live with it if it can cut grass but surely cant be too good for it running flat out from cold! any ideas?
again, try it without an air filter, it should want to make it race, if it doesnt want to pick up revs then its a flooding issue.
no air filter=leaner mixture(fuel/air should be about 1/16).
still sounds like a carburation problem though, and a fuel starvation after it has depleted the carbs,
did you take them apart and clean them? not with the aerosol junk mind.
dunno, not big up on these engines these days. sorry,
no air filter=leaner mixture(fuel/air should be about 1/16).
still sounds like a carburation problem though, and a fuel starvation after it has depleted the carbs,
did you take them apart and clean them? not with the aerosol junk mind.
dunno, not big up on these engines these days. sorry,
Wozz,
Almost definitely a governor or carburation issue, I had one in bits the weekend before last!
Please post the mower make and model here and if you can the engine type etc.
Is it a B&S vertical crank?
Pics would help too.
We can talk you through this trust me, Patch is a vet!
Almost definitely a governor or carburation issue, I had one in bits the weekend before last!
Please post the mower make and model here and if you can the engine type etc.
Is it a B&S vertical crank?
Pics would help too.
We can talk you through this trust me, Patch is a vet!
Thanks for the replies. I shall start it up let it die down then take the air filter off to see if it picks up.
Yes i had the carb and the tank off and cleaned them with carb cleaner. Whats better than carb cleaner? I also cleaned the fuel filter just a mesh thing.
The engine is a briggs Q45 i think its the sprint model although i think the sprint and classic are the same just with a engine cover, all the mower bloke asked was does it have a red primer which it does. There is a exploded veiw on the 1st page sidewinder.
If someone would be so kind to let me know what a govenor actually does?
Yes i had the carb and the tank off and cleaned them with carb cleaner. Whats better than carb cleaner? I also cleaned the fuel filter just a mesh thing.
The engine is a briggs Q45 i think its the sprint model although i think the sprint and classic are the same just with a engine cover, all the mower bloke asked was does it have a red primer which it does. There is a exploded veiw on the 1st page sidewinder.
If someone would be so kind to let me know what a govenor actually does?
Oh Woz, I just wrote a thesis on this for you and the damn web connection droppped.
A governor keeps engine speed constant by closing the throttle when the engine speeds up and opening it when it sows down, is the summary!!!
A governor keeps engine speed constant by closing the throttle when the engine speeds up and opening it when it sows down, is the summary!!!
BTW, B&S is the engine maker not the mower.
What is the mower, also the engine should have 3 sets of numbers to identify it, B&S manuals are free on the web from them.
Also I can't find any piccies!
What is the mower, also the engine should have 3 sets of numbers to identify it, B&S manuals are free on the web from them.
Also I can't find any piccies!
Wozz, the governor should be spring loaded, you could try pushing it over by hand, see if it will actually take the revs or not.
if it wont take the revs prob because its getting too much fuel, the governor (usually opens the slide/butterfly=more air), if it takes the revs, but stutters, then fuel starvation, which is what im inclined to say at this stage, kinda hard to say without hearing it TBH.
the more I think about this, the more Im on a fuelling issue.
normal carb cleaner isnt worth the can it comes in IMHO,.
isopropyl alcohol, is my cleaner of choice,
but keep it away from rubber seals/diaphragms etc, even diesel would be better, but kepp it even further away from the seals etc.
the problem with stale petrol is the same with aerosols, they have some sort of substance that gums up, and the aerosol stuff will only clean out the bits that are still clean enough to flow, so if you have something totally gummed up then the aerosol will just make it more gummed up.
does that make sense.?
its getting late...
if it wont take the revs prob because its getting too much fuel, the governor (usually opens the slide/butterfly=more air), if it takes the revs, but stutters, then fuel starvation, which is what im inclined to say at this stage, kinda hard to say without hearing it TBH.
the more I think about this, the more Im on a fuelling issue.
normal carb cleaner isnt worth the can it comes in IMHO,.
isopropyl alcohol, is my cleaner of choice,
but keep it away from rubber seals/diaphragms etc, even diesel would be better, but kepp it even further away from the seals etc.
the problem with stale petrol is the same with aerosols, they have some sort of substance that gums up, and the aerosol stuff will only clean out the bits that are still clean enough to flow, so if you have something totally gummed up then the aerosol will just make it more gummed up.
does that make sense.?
its getting late...
