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old lawnmower service? #5461211 06/24/20 04:52 AM
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slybunda Offline OP
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i got an old flymo lawnmower from my brother it uses a briggs and stratton engine, its not been used for over a year so was wondering what i can do to service it. i dont have the owners manual for it any more so dont know what so of oil i can put in it. also it doesnt seem to have a oil drain plug so not sure if im supposed to suck the old oil out or not?
i tried to start it but didnt fire up, iv put fuel in it and gave it 4 pulls on the cord. it spins freely but didnt fire up, dont know if i just got to keep giving it more pulls or something. my chainsaw has a on off button but i cant see on on the lawn mower.

IMG_20200624_101302.jpg

1995 Ford Fiesta 1.6i 16v Si
2000 Toyota Celica 1.8 VVTL-i
2007 Toyota Aygo+ 1.0i
Re: old lawnmower service? [Re: slybunda] #5461220 06/24/20 05:15 AM
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Linctex Offline
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Oil is typically drained through the fill port by tipping the mower on it's side.
I prefer to perform this operation when warm/hot - and immediately after running out of petrol.

Berryman's B12 is a popular fuel varnish solvent/cleaning agent - it is basically Acetone, Lacquer thinner, & Methanol.

The safety brake band that wraps around the flywheel needs to be adjusted properly -
as does the interconnect to the ignition kill switch (it is integrated) - it is a very thin black wire.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: old lawnmower service? [Re: slybunda] #5461224 06/24/20 05:23 AM
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RyanY Offline
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2007 Cadillac CTS 3.6L >131k miles; mix of PUP/Magnatec 5W-30 + ACDelco PF2129G

2012 Honda Odyssey EX-L >109k miles; QSUD 0W20 + STP S6607XL
Re: old lawnmower service? [Re: slybunda] #5461237 06/24/20 06:01 AM
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ET16 Offline
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Carburetors are almost always the issue for mowers that have been sitting. You can clean with Berryman's, as Linctex mentions, or other carb cleaners. You may need to take the bowl off, too, and clean it out.

Re: old lawnmower service? [Re: slybunda] #5461239 06/24/20 06:02 AM
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Kamele0N Offline
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Did a service on mine.... That one is basic L-head 3.5 hp classic... 3.75 hp.... 4hp engine...

Carb membrains p/n #795083

O-ring on maniford p/n #270344s

Sparkplug: champion rj19lm.... Ngk br2lm... Denso w9lmrus...


2008 Toyota Yaris 1ND-TV 1.4 D4-D Tech9 (Shell?) 5W30 C3 VW 504/507
1997 Toyota Landcruiser KZJ95 3.0 TD Shell Rimula R6M 10W-40
Re: old lawnmower service? [Re: slybunda] #5461245 06/24/20 06:34 AM
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slybunda Offline OP
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i think the engine should have around 10 hours of run time maybe less in total. i switched over to a manual push mower for a few years so i think this lawn mower has been sitting for atleast 2 years in the garage unused.
will try and fire it up later today.


1995 Ford Fiesta 1.6i 16v Si
2000 Toyota Celica 1.8 VVTL-i
2007 Toyota Aygo+ 1.0i
Re: old lawnmower service? [Re: slybunda] #5461253 06/24/20 06:48 AM
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buck91 Offline
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Definintely sounds to likely be a carb issue. Was it stored with fuel in it or dry? I'd strongly consider replacing the spark plug and air filter while you are messing around as they are pretty inexpensive and can avoid extra headaches later. I recently purchased a low hours Husqvarna mower that everything checked out, just needed a new coil for some reason and then oldly the kill switch cable housing was gummed up so I replaced that as it wasn't letting the safety bar pull the kill switch far enough. I was pretty surprised about that- they actually used compressionless housing which was poking through the plastic end ferrules.


2018 F150 Screw 4x4 2.7L Ecoboost
2011 F150 Scab 4x4 5.0L
1996 Mustang GT 5spd/ragtop
Re: old lawnmower service? [Re: slybunda] #5461273 06/24/20 07:16 AM
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WyrTwister Offline
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My SOP , each spring is check air filter , change oil , drain gas , refill with pure gas and install a new spark plug .


Wyr
God bless
Re: old lawnmower service? [Re: slybunda] #5461288 06/24/20 07:37 AM
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Kamele0N Offline
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Oil&filter&sparkplug....

Quote
. Engine Care Kit for 450 Series™, 550 Series™, Nexus®, Murray® SL, Pico®, Classic™ and Sprint™


Part Number#: 992230
https://www.briggsandstratton.com/eu/en_gb/products/care-products/engine-care-kits.html


2008 Toyota Yaris 1ND-TV 1.4 D4-D Tech9 (Shell?) 5W30 C3 VW 504/507
1997 Toyota Landcruiser KZJ95 3.0 TD Shell Rimula R6M 10W-40
Re: old lawnmower service? [Re: slybunda] #5461305 06/24/20 08:17 AM
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Snagglefoot Offline
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There are lots of you tube videos on how to diagnose lawnmower issues. First of all you have to make sure the spark plug is sparking and then move of from there. smile


If you want the job done right......do it yourself.
Re: old lawnmower service? [Re: slybunda] #5461316 06/24/20 08:44 AM
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mk378 Offline
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Make sure there is oil. You can worry about changing the oil later. Take the air cleaner off (big flat-head screw on top) and drop about 1/2 teaspoon of gas into the intake. Pull cord and see if it fires at all. The "deadman" bail on the handlebar needs to be held down for the engine to start or run. Usually the starter cord is extended up to the handle so it can be started while standing behind the mower and holding the handlebar.

If it runs for a few seconds (burning the gas you put in) then stops there's a fuel problem. If it doesn't fire at all you'd go on to check the ignition system. Almost always it is a fuel problem though.

It is a diaphragm type carbuerator. Do not put B-12 or other solvent in the gas tank expecting a miracle, it's just going to ruin the rubber. You'd have to tear down and clean it. The big problems are dirt and/or water in the tank or bowl, the rubber diaphragm hardening, and the main jet (well, the only jet) being clogged. The jet is under the tubular screen on the bottom.

To disassemble carb remove the tank / carb assembly from the engine then take out the 4 or 5 screws holding the carb body to the top of the tank. Note that most of the parts are plastic, so be careful not to break them.

Last edited by mk378; 06/24/20 08:47 AM.
Re: old lawnmower service? [Re: slybunda] #5461324 06/24/20 08:57 AM
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qjohn Offline
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^ Covered above about how to diagnose and the membrane part number 795083, which should cost less than $4. Another way to confirm the presence of spark and compression is to squirt Starting Fluid into the air intake after the air filter is removed. It should run for a short while if you have spark and compression and then you know it is time to rebuild the carb. Carb rebuild on this is simple.

Re: old lawnmower service? [Re: slybunda] #5461342 06/24/20 09:20 AM
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slybunda Offline OP
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Its working!
2 pushes of the red button got fuel in and it fired right up.
Oil was on lower mark of dipstick so topped it up. Oil looked very clean on the paper towel.
Will cut grass tomorrow then look to change air filter spark plug and oil


1995 Ford Fiesta 1.6i 16v Si
2000 Toyota Celica 1.8 VVTL-i
2007 Toyota Aygo+ 1.0i
Re: old lawnmower service? [Re: WyrTwister] #5461357 06/24/20 09:40 AM
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jeepman3071 Online Content
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Originally Posted by WyrTwister
My SOP , each spring is check air filter , change oil , drain gas , refill with pure gas and install a new spark plug .



You are much better off draining the gas at the end of the season. When everything is dry there isn't a chance for it to cause issues.


1998 Jeep Wrangler Sahara 4.0L/5MT (157k) - PHM 10w30, Wix 51085
2009 BMW 328i N51 (62k) - Liqui Moly 5w40, MANN HU816X
Re: old lawnmower service? [Re: jeepman3071] #5461393 06/24/20 10:48 AM
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andyd Offline
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Jeepman, that's fine advice unless you're dealing with a metal tank. I store metal tanks full grin2


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
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