Briggs & Stratton 450 Series Engine Service Mower repair tutorial how to . Service kit parts list.
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- เผยแพร่เมื่อ 8 เม.ย. 2021
- Briggs & Stratton 450 Series Engine Service tutorial. Mower repair instructions with service kit parts list for this qualcast mower.
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Briggs & Stratton 450 Series Engine Service tutorial. Mower repair instructions with service kit parts list for this qualcast mower.
I've owned a Sprinter version of one of these mowers from new with the 450 series Briggs engine and the same plastic carby setup and the user manual states to impregnate the oil filter with clean engine oil and squeeze out the excess into a clean cloth before installing. It also states they can be cleaned in liquid detergent and water and re-used. (Solvents and compressed air will damage them.) The base of the filter does come with a fibre or paper like dark grey washer to seal the base to the carby too. And the fuel pick up with the mesh screen being blocked or partially blocked with debris is a common cause of engine surging for this carby set up. Easy enough to fix though.
Edit: this is from Australia just in case there are differences and our plugs are the resistor type for this engine. NGK BR2-LM or Champion RJ19LM. The Champion plug was the original but I always use the NGK equivalent anyway. The resistance of the brand new plug is around 10,900 - 11,000 ohms. Some state that anything over 10,000ohms for a mower or any garden equipment you should throw away but I suspect it's different from country to country. For instance there's a sticker on the fuel tank of my mower stating that because this engine is made specifically for export it is exempt from U.S.A emission regulations.
My engine is a 9T502. For anyone not familiar with the numbers, that's the first set of numbers on the front of the engine metal cowling stamped into the metal.
With all Briggs and Stratton engines the first set of numbers is "Model" of engine, second set "Type" and third set is the "Code" and date of manufacture reading backwards. example - 11111152 = 2011, November, 11th and the final 2 numbers are for something else like shift and store location or something but you don't worry about the last two. The first 6 numbers of the 3rd set are the date of manufacture.
Wow...... Thanks for all of that fantastic information.
I'm not sure how different the engines are for the different countries but I do know that one of the major problems we have in the UK is the diaphragm becomes perforated and there is then an irregular fuel supply.
It is fairly simple, but quite fiddly to change and there is no difference between the old diaphragm and gasket and the new one to the naked eye but after they have been changed it is very obvious that this has been a problem.
With regards to the spark plug, I am after a website that provides a reliable comparison table.
Thanks for taking the time to reply and help others,
Jimmy 👍
Most foam filters need oil to help make the contaminates stick to the filter. @@bradpool127
What a terrific video. About to service my small mower (same engine). This was exactly what I needed to see.
Thank you, very much. You are very kind.
Good luck with your service 👍
Well done, you have inspired me to service my old mower that wont start.
That's brilliant, thanks for watching and I'm glad you found it useful.
All the best,
Jimmy
thanks for taking the time to film this, a lot of useful info in there.
Thank you very much 👍
Thank you, this clip helped me to service my mower! very informative due to naming all size tools etc
My absolute pleasure, I'm so glad it helped.
All the best,
Jimmy 👍
Thanks for posting this video. It’s given me a nudge to get mine done. Have owned it for 4 years and never it’s never been serviced 🤦♂️
That happens sometimes, I'm glad you are getting it done now.
Thanks for watching
Jimmy 👍
Thanks Jimmy, gonna save my husband some repair bills by servicing his equipment. Post Covid I only work part time. What you say is true the Briggs & Stratton engine responds well to an air filter and plug change. Today I did that on an old Viking MB 650 it started up 5-6 pull. I watched this for the oil change. Now to buy a pump ☺️👍🏻👍🏻👍🏻
I'm so happy my video helped you.
Good luck with the rest of the repairs and please keep me informed with how you get on with the other bits.
Thanks for watching,
Jimmy 👍
@@JimmyTheMower what prompted this was; his 2 newest mowers are both in at the dealers. Quoted 3 weeks to repair. It’s that time of year when his clients are on the blower asking for a first cut of the season.
He also has petrol blowers, strimmers a chainsaw and a hedgtrimmer. He’s mainly gone battery on hedgtrimmers. He reckons the petrol is superior on thicker hedges. They are all 2 stroke. I’ve subscribed. Thanks again.
Brilliant, anything you want a video of just let me know and I will try my best.
Jimmy
Straight to the point. I love that.
Thank you 👍
Thanks Jimmy, this old gal feels pretty confident to have a go at the mower now!
That's great news, best of luck to you 👍
Thanks Jimmy, exactly what I was looking for. 😊
Brilliant, I hope you get yours sorted.
All the best,
Jimmy
Just saw the video great review and advice as usual
Thank you, glad you enjoyed it 👍
That mower looks polished. 👍
Thanks Jimmy the mower, loved the vid.
Thanks for watching.
I just clean them off and then wipe them over with a silicone spray or light oil and they come up great.
Thanks for watching,
Jimmy 👍
Very helpful thank you, from Australia!
My absolute pleasure.
Thanks for watching,
Jimmy 👍
Ive inherited a Qualcast petrol mower with the Briggs & Stratton 148cc 450 series motor.
As, with the case of the one you have just serviced, Ive took the air filter & spark plug out, they look about on par with yours.
I have still got to empty the oil, if there is any in, that is, as nothing is showing on the dipstick.
I suffer from acute back , neck & shoulder pain, so I can only do bits when Im not in too much pain.
When Ive done the service & hopefully mine starts as well, I will post a comment, thanks for the video, stay safe.
Its a thumbs up & subscribe from me.
Thank you Alan 👍
Great video jimmy
Thank you very much, I'm glad it helped.
All the best,
Jimmy 👍
Great video and very well explained
Thank you 👍
Fantastic video - very useful!
Thank you very much 👍
Hi jimmy, you are supposed to oil the foam filter with engine or foam filter oil
Good job Jimmy . You bumped into Mick at Salttex was near by watching the Allet demo.
Yes, it was a great show. I will catch you on his live feed on Saturday 👍
@@JimmyTheMower Jimmy be early the panel gets busy.
I will be 👍
I have a ferret Aldi mower. Only one year old but hasn’t been used much. I’ll take a look at your suggestions for a service, which were very clear and helpful. The one thing I needed to know was how to remove the old petrol. Do I use the oil syringe?
Thanks for your help.
Yes you can use the oil syringe, or just take the fuel pipe off the bottom of the tank and let it flow out that way.
excellent video!!
Thank you very much 👍
thanks chief! is best thank you😀
SAE30 and SAE5W30 are the same viscosity when hot. Only when cold is 5WXX less viscous but still massively more viscous that either oil when they're hot.
That's the kind of information people need.
Thank you very much 👍
I was given this same mower but it's reving to max soon as I start it if I move to plastic throttle I'm guessing that's what it is it has a little metal loop if slows down anyone know how to get it to work without using my finger
For oil there is a drainage hole at the bottom.
No way, don't tell me that there's an easier way......
thank you sonny :)
My pleasure 👍
Very good .
Thank you, good luck with your mower 👍
great video! currently trying to learn how to service and repair my own recently. Does this series not have an oil filter? keep it up mate!
No oil filter in these engines so make sure you change it on a regular basis.
I will be doing a lot more servicing videos when I've got the time.
Thanks for watching,
Jimmy
Excellent presentation. Well done. I am currently servicing this engine in a Viking MB 248 T mower that I recently purchased through an classifieds site at a good price and your video reassured me that I did the right thing. I'm interested in one thing please. When I removed the air filter, the carburetor underneath was pretty dirty. I'm wondering if you happen to know if there is a diaphragm or something in the hole down in the carburetor where the bolt that goes through the carburetor and holds the air filter housing goes. I tried to clean it (the hole) and I hope I didn't damage anything - if it's not by chance some kind of overflow - the drain back to the gas tank (which is under the hole) in case the carburetor is being cleaned. Thanks, and video. Greetings from Slovakia. Slavo
The only diaphragm is between the top of the fuel tank and the plastic carburettor.
The tiniest pin hole that you can't even see will cause problems, so it is always worth replacing it 👍
Very good video, just to point out that you installed the air filter unit back to front.
Yeah, I did. I was so excited to get the mower finished that I didn't realise 😂😂😂
Hi Jimmy hope you well. I have a trojan 16 lawnmower and the engine working fine which is a B&Stratton 35 classic, but the deck and handle are ,lets say capute. Do you no if the qualcast deck would be good for replacement of the deck.
Wow, that's a great question Ian. I'm really not sure how to answer it.
I presume that if it fits and all the holes are in the correct places then it should work.
I will be very interested to know how you get on with this.
Jimmy.
Try using a mr funnel as well. Many microlight pilots use them when fuelling from Jerry cans. The amount of stuff that’s get filtered out is unreal.
I've never heard of one of those, i will have to take a look.
Thanks for the heads up 👍
Those Mr Funnels freak me out. I don't know how they filter out ethanol from fuel as you pour it in, it's bloody amazing.
I still need to get one of these.
You just saved my lawnmower from the tip. Cheers from downunder
My absolute pleasure 👍
They all come damp with oil from new, the oil is what stops the dust passing through the filter. The point of wringing the filter out is to bring it back to the necessary state of dampness, not too heavy with oil, unnecessarily restricting air flow. Dust penetration can cause other problems as well, it often blocks the air intake port for the emulsion tube, causing the engine to run extremely rich. On service I always make sure that port is clear. Remember, this video can be watched across the world, I'm watching it from Australia, a country with extreme condition and you need to keep that in mined when offering advice. A dry filter can be got away with if the conditions are lush and green, but not if their is any dust. The only time a foam filter should not be oiled is when it is used as a pre-filter around the outside of a paper filter, such as on Honda mowers. I'm available for further advice if needed.
Thank you for the great advice and I will incorporate this in to future videos.
I have already found your website ☺️
hi good video, the air filter box is on the wrong way the pointy bit should face the handles
Well spotted.
In my haste to see it running I fitted it backwards 🤣🤣🤣
Hi Scottish Lad, looks like it doesnt matter which way the air filter box goes on as it started with it on the "wrong" way.
@@alandobb950 Hi, the Lawnmower will run without an air filter box on too, but that doesn't mean its right lol
@@ScottishLad. it's an OCD thing lol
@@themowerman yes lol, love your channel by the way Mick, and Riley boy :)
I have a 450 series I was looking for a video to replace the pull cord
I will do one of those videos very soon 👍
My mower looks like this but the side metal cover is right side . Any tips how I can pull it over easier . As holding the handle n bending down for the pull cord really hurts me
They should have a little eye hook about half way up the handle which holds the starter rope so you don't have to bend down so far.
Hi Jimmy good video and easy to follow, but you said lets make sure i put the air box back on the right way round well you did not. Square end faces forwards and pointy end back towards the user. I thought may be it was like that when you started but go back to the start of the video.
Yeah I got it wrong, this will haunt me for the rest of my life 🤣🤣🤣👍
@@JimmyTheMower Good video though, easy listening. This is the first time I have seen you. Thank you for taking the time to make the vid. Marek.
Thank you very much, very kind of you to say so.
All the best,
Jimmy 👍
Hi Jimmy. Got the same machine as the one above. Hit a hidden concrete block and since then the engine is running very rough, like the timing has been knocked out or something. Nothing obscuring the blade. Any suggestions to solving the problem would be greatly received, please. Thank you.
That's a tricky one... there should be a woodruff key in the shaft that breaks when you hit something so it doesn't damage the engine.
If this didn't happen then maybe the shaft is bent, which is causing the vibration or maybe indeed the engine has been damaged.
You can remove the OHV cover and slowly turn the blade ( without a spark plug in ) and measure the gap at the closing point of the piston.
It can be very difficult to reset these gaps and the timing though.
If you take it to a repair shop and show them how it runs then they are likely to give you a diagnosis straight away and an idea of repair costs.
Thank you for you insight@@JimmyTheMower ! I shall follow your advice above servicing video step by step first and if that doesn’t work I shall have to find and repair shop. Thanks again!
Best of luck with it all 👍
Hi jimmy, My mower(same model) is too loud and too much smoke(of white colour) is coming out. It remained completely unused for one year. Can you please help me fix the problems. Thanks
Drain all of the fuel out.
Then do a full service.
Start and run the mower for a full 10 minutes and it will either live or die.
Best of luck 👍
very helpful. Are these mowers prone to the coil going down?
Thanks
They can be but they seem to last a long time first.
We've never really had problems with them domestically but a few that are used commercially and run very hot for extended periods of time can suffer.
Thanks for watching,
Jimmy
@@JimmyTheMower Hi Jimmy. Is it ok to use 5w-40 in a Briggs & Stratton 450?
It had been left it out in the street for a few days for the bin men. I took it, cleaned the carb, changed the plug and hey presto!
The Rockoil in my local Home Bargains is only £5.50 a litre but there's conflicting advice on whether it's suitable or not.
Thanks.
Mark.
Go for it.
40w is thicker and 5 is thinner so it will be fine 🙂
@@JimmyTheMower, sorry Jimmy, my typo, I meant 5w-30
That's fine too.
Same viscosity as SAE30 👍
Something nice
Lovely 🤣🤣🤣👍
Tq
My pleasure 👍
They have a oil drain plug underneath as well.
No way.......
Are you having me on ?
I've been doing this for 15 years and I seriously didn't know that
Where is it please? Had I overlooked the oil drain plug at the bottom of this particular engine like everyone else?
Yo yo Jimmy.. how's it going.. just come across your channel
Cheers mate, I've been watching you live for ages.
Absolutely love your channel 👍
@@JimmyTheMower ta brother
Why didn`t you oil the air filter ? The dust is just going to go straight in to the motor? This MUST be done !!!!
Very true, I normally do but must have forgot in this video.
Jimmy
🤠👍👍👍
Cheers 👍
How do I install a kill switch to this engine ?
What for ?
If you let go of the handle it cuts out straight away.
@@JimmyTheMower My lawn mower handle cable is not connected, I don't know how to do so.
It's a cable that runs from the handle to the engine.
It is quite easy to fit but the mower won't start or stop without one.
You need to find a local repair shop and they will find you the right cable.
I appreciate that sucking the oil is easier, but that engine has a sump plug and that oil is extremely neglected. You will get more of the crap out from the sump, especially if you add some oil to diluted and remove more of the crap oil and contaminates.
I think sucking the oil is fine for well maintained engine though.
That is a very valid point. Thank you 👍
Any one know drive belt size....THANKS
I'm sure someone will be along soon with the information 👍
Link for parts in Australia ?
Give me a couple of days my friend and I will find one out for you 👍
I have to semi regular write off those engines as irreparable because people have done home service and fitted a dry air filters causing the engine to ingest large amounts of dust, tearing the aluminum cylinder to pieces. All foam filters have to be wet down with engine oil, then thoroughly wrung out in a piece of rag to bring the oil content back to right level. You need correct that video immediately. I repair an average 2,500 mowers a year so you can take my opinion seriously on this.matter.
Is this true with all mowers ?
We normally buy 3 or 4 new mowers per year and I've never noticed the filters are soaked with oil ?
I've just read up on it and it seems to be a thing outside of the UK but I'm pretty sure most people here don't do it.
I will have to change my ways and give it a go 👍
You managed to put the air filter box on backwards. Not very good for a 'service person' 🤦♂️
I know, what a mistake to make 😯
Jimmy should stop giving advice on lawn mower service until he learns the job properly. He made an absolutely atrocious unforgivable mistake in this video that will quickly destroy the engine and this opinion is coming from a professional that has been doing the job for 46 years
I put the air filter on backwards but considering most machines I get in don't even have one. So maybe not the end of the world.
Any hints and tips greatly appreciated 🙂