OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Briggs & Stratton Engines My four strokes

hey everyone. this is my other collection of mowers after hard rubbish this year. all four are 4 strokes


this ones my favourite, 3.5 hp B&S but it is way overfilled with oil. about 1 and a half over the full limit. i will empt the oil and should i pull it apart and give it a clean inside?


this tecumseh 3.8 hp engine victa is in the best condition of the four, but the exhaust is off when i got it.


this is a B&S charger four 3.5 hp, its really fowled up.


and this one, well someone tried to tinkler around with it i guess, all the parts are in another box which i cleaned up. i will probably use it as parts for my other charger 4.

are all of these engines in the manual area?

cheers

i reckon thats a good idea. is it a good engine?

I like the first and third, I recently done up a rover like the first, all it needed was the rusty water drained from the tank, some oil and a new spark plug.

yoday i drained oil from the rover. its at full now. the amount of oil that stupid person put in was reallu alot. do you think i will need to pull it apart?

Try putting some fuel and a fresh plug in it and see if you need to pull it down or not

Howdy Jam, Nice score mate, i like da rover looks in excellent condition..ps not forgotten about wrench should be on its way friday 19th..Cheers Toroman

Thanks mate. and as i have said your an absolute ledgend

joe i will do that and see how it goes

hey everyone

yesterday i got another mower. masport with a B&S 380 4 stroke engine on it. its stopped running because the air filter is blocked up like you would'nt belive dirt has gotten into the carby but the problem didnt get to a major terminal problem it just stopped working. so i thought maybey i will just run a victa snorkel up to thehandlebars so that this problem wont happen with evry B&S engine i get. i went to the mower shop today and the guy knew what i was talking about. but he said theres a special thing you need to get on the end of the snorkel because with the stock filter there is a screw running through the filter and the carby. dose anyone know what im talking about?

cheers

Yep I have at least one lying about its like a 90 degree pipe bend with a hole that has a screw go through it in to the carby.

can you buy them?

Not really sure, never really looked for one, I would assume so, or maybe you could try using an electrical conduit bend of the right size and drill a hole in it.

hey all. today i have finished with cleaning out the fuel tank and carby on the rover. i have cleaned the outside and she's looking pretty good. i got all the old oil out and i am going to put in some new oil today and also some unleaded. is octane 91 good? it has a new plug also. and before i try and start her up is there annything that i have forgot that i should clean out or check?

i found some dirty oil in the exhaust port. should i be worried about that?

cheers

cheers

Jam,

All sounds good just clean the air filter and make sure that the blade plate is on when you try to start the engine.

hey guys. i started the rover up. it is missfiring ever 2-3 seconds. it also blew alot of smoke. could that just be oil in the exhaust? or is it the rings? and what about the missfiring could that be the cams are coked up? i am very happy though to get a lawnmower off the street and get it running again:)

cheers

If the oil was way overfilled when you got it, chances are that it has filled the exhaust up and the cylinder, if this is the case just use it once or twice to clear it out.

Try having a tinker with the screw on the front of the carby while its running to change the tuning, I have a rover identical to that out on my back lawn at the moment that had that problem among others.

Other problems with my identical rover included, the exhaust valve seat had come out and I had to push it back in and then use a punch around it to clamp the metal against it. Then the exhaust valve wouldnt seal as the seat had worn down over the years, After some quick thinking I pulled the valve out and took a good half mm off the valve stem with the bench grinder and put it back in.

After I had fixed everything I started it up and it runs nice, just TOO BLOODY LOUD, then I found the exhaust laying on the ground next to it where I pulled it off.

haha. well i will play around with it some more.

may i ask what is an exhaust valve seat? with these engines what do you do to take out the cams?

Where the valve seats against to seal it off when the valve is closed.

There is only one cam, to get it out you have to split the block.

To pull the valves out to clean them up, take the head off, exhaust off and that little side plate off.

Then use a flat head screwdriver to push the round disc bit that holds the spring on off to the side so that it will pop out.

To put the valve spring back in, fully compress the spring and hold it compressed with cable ties, put that, the valve and the top disc bit back in, make sure the disc is centered and cut the cable ties.

Please forgive me for insight on my dodgy backyard jobs, where I have los the "proper tools" and just find alternatives that "work" as such.

ok thanks for the help.

well i have started it 4 times now. it runs really rough. i was playing around with the adjustment screw on the carby. at one point it would start really easy and idle fairly smooth. then it went back to the way it was when i increased throttle. after running for a while it starts to loose it and eventually cuts out. when i start it up you can hear the engine do about 3 revolutions a second (put....put.peput..put) then start up after about 4 seconds. it dosent blow smoke annymore (except the last time i started it it blew out 2 puffs of black smoke)

whats going on???

First check would be the flywheel key to see that is not damaged as it will give you the impression that the timing is out.

Then check the tank pick ups are clean and the diaphragm is not stretched.

Start with the easy stuff first before pulling the crankcase apart.

ok thanks bruce. seing as though im still a beginner what is the flywheel key? and how do i check it to make sure its ok?

i will get another diaphram because i will ahve strecthed it in trying to clean it. it had folded a bit too.

cheers