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daifuco |
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daifuco Nova Slayer
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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daifuco |
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daifuco Nova Slayer
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Posted: 20:27 - 17 Apr 2023 Post subject: |
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Yeah Im not interested in special techniques, but I wonder if the best strategy is doing a bit of countryside touring on a urban scooter with tiny wheels at half throttle ____________________ CBF125 - CB600F Hornet '12 |
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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redeem ouzzer |
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redeem ouzzer World Chat Champion
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 21:23 - 17 Apr 2023 Post subject: |
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Remind me again what this "breaking in" is going to achieve?
Which bits need time at half throttle to learn how to be what they are? What is going to break if you don't do this?
As far as I am aware, the only bits on a modern motorcycle that are going to have to "bed in" are the piston rings. To do this properly they need to be pressurised and rubbed against the bore while it still has honing marks so they seal well. This will generate extra heat due to the increased friction so you need to be mindful of that.
What I do is get the oil up to temperature then go and find the engine some work to do. I generally accelerate full throttle up some hills, taking it up through the rev range then give it a bit of neutral-load cruising on the flat to dissipate any heat, then give it some work again. After 100 miles I call it run in. Oil and filter change (because that oil has just been given a kicking), re-torque head bolts and ride normally.
Putting my money where my mouth is, I did that on my big-bore, high compression Enfield Bullet which is a 1950s engine design. I might have taken it a bit easier if it had a floating bush big-end and a bronze crank seal like the originals (which conceivably could need some rough edges knocked off them initially) but I have roller bearings and rubber seals so I didn't. The forged accralite piston I'm using costs £211. No visible blowpast on the last teardown.
The important bit is to make sure the oil is up to temperature before giving it some. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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arry |
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arry Super Spammer
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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MarJay |
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MarJay But it's British!
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that_impulse_guy |
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that_impulse_guy Nitrous Nuisance
Joined: 07 Mar 2023 Karma :
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Posted: 22:52 - 17 Apr 2023 Post subject: |
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https://www.motorcyclistonline.com/busting-engine-break-in-myth/
its not like your scooter engine is stressed, or doing 200hp/litre output. It just goes "hnnnnnnnnn...nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn". Not a supercharged h2.
Go ride the thing properly after the first 50 or 100 miles once you've ridden off the layer on the brakes and tyres and got the hang of it. ____________________ Gone: Yamaha DT50lc, Suzuki DR500, Suzuki A100, Kawasaki z250ltd, RD350YPVS, Suzuki DR Big, Kawasaki AR125, Kawasaki KMX200, Suzuki GS1000S, Katana 1100, GS550M, Suzuki RGV250
Now: Suzuki GSX400X, Suzuki RF900R |
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Bhud |
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Bhud World Chat Champion
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stinkwheel |
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stinkwheel Bovine Proctologist
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Bhud |
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Bhud World Chat Champion
Joined: 11 Oct 2018 Karma :
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Posted: 01:32 - 18 Apr 2023 Post subject: |
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Imagine you've just paid the equivalent of 4 months' salary for a quality Japanese bike, in 1979. Do you follow the break-in routine or do you not? Ask yourself and answer truthfully. I'm asking this question because someone did, and now Bhud is riding said Japanese bike for fun and chores in 2023, more than 40 years later, and yes, the bores are still in amazingly good shape, with visible cross-hatching, minimal ledge at the top, and it's still on the original piston ring size. This is actual fact. I ride old Kawasaki because it was built and bought by people of quality. At the end of the day, it all boils down to someone giving a shit. Both the chef and the eater. Do you give a shit or don't you give a shit? Everyone likes pizza, right? All it takes to get pizza right is to give a shit. Triple-zero durum flour, high temperature oven, mozzarella, mascarpone, provolone, plus nduja paste, and a properly sauteed-down sauce...
Point is, if you thrash the f out of that engine you will smash down the sharp edges of the piston rings, but you will not necessarily preserve the cross-hatching and create the right glaze on the bores. At the end of the day what's your time worth? What's your approach to life in general? Are you gonna be a billionaire one day or are you NOT (i.e. is this a disposable machine and will there be some asshole in 40 years from now riding it thanks to your choices today)? I am just asking you whether this chinky or whatever scooter actually matters to you. My personal pov is unfashionable but it's this: take pride in everything. The things you own and the things you do. |
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WD Forte |
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WD Forte World Chat Champion
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MarJay |
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MarJay But it's British!
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dave001 |
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dave001 Banned
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Fat Angry Scotsman |
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Fat Angry Scotsman World Chat Champion
Joined: 12 Jan 2021 Karma :
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Posted: 14:04 - 18 Apr 2023 Post subject: |
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just fucking ride it mate ____________________ PRESENT: 2018 BMW S1000XR SE Sport.
PAST: 2009 Kawasaki ER-6F. 2021 Zontes ZT-125U. |
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MCN |
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MCN Super Spammer
Joined: 22 Jul 2015 Karma :
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Posted: 18:48 - 18 Apr 2023 Post subject: |
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Main points:
Do not labour the engine. Use lower gear. Is you use the higher gears it means you put full load on the bits.
Keep to the manual recommended limits.
Pick a target and ride there.
How many miles is the run-in?
Pick a target half the distance go cum.
The reason for run-in is not just for wear patterns. It also provides opperchancity to make frequent stops and check all the bits are not at risk of dropping off.
Make up/buy some ham and cheese wtploughmans sandwiches, some coke (I use Irn-Bru) and head for victory. ____________________ Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN. |
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WD Forte |
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WD Forte World Chat Champion
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MCN |
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MCN Super Spammer
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Posted: 18:58 - 18 Apr 2023 Post subject: |
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I NEVER read posts.
Coz Principles. Init. ____________________ Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN. |
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WD Forte |
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WD Forte World Chat Champion
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Posted: 19:04 - 18 Apr 2023 Post subject: |
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I often usually just read the last post and dive in regardless too
All our youngfellermelad has to do is go easy for month and then cane the arse off it. ____________________ bikers smell of wee |
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 19:46 - 18 Apr 2023 Post subject: |
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You have to wonder why generator engines don't just blow up then. Those come out of the box, get filled up then immediatelty sit at full-chat for hours at a time. Never heard of anyone "running in" a genny and it'll be pretty much the same engine as a scooter. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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jeffyjeff |
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jeffyjeff World Chat Champion
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Posted: 20:04 - 18 Apr 2023 Post subject: |
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stinkwheel wrote: | ... the only bits on a modern motorcycle that are going to have to "bed in" are the piston rings. To do this properly they need to be pressurised and rubbed against the bore while it still has honing marks so they seal well.
What I do is get the oil up to temperature then go and find the engine some work to do. I generally accelerate full throttle up some hills, taking it up through the rev range then give it a bit of neutral-load cruising on the flat to dissipate any heat, then give it some work again. After 100 miles I call it run in. Oil and filter change (because that oil has just been given a kicking), re-torque head bolts and ride normally.
The important bit is to make sure the oil is up to temperature before giving it some. |
Mr. Stinkwheel's suggestions will ensure a quality break-in, every time, for the reason he stated: the rings need to bed in while the cylinder honing is still fresh.
When you baby a new engine, the cylinder crosshatch wears down before the rings achieve a good seal. When that happens, nothing can be done to restore the seal short of disassembly and honing the bore. Blowby is increased, power is lost, and oil consumption increases.
I spent a good many years building and running-in heavy duty diesel engines on a Clayton dynamometer. In a two hour break-in run, more than half that time was at full load. Among other things, we needed to bed in the piston rings so that the engine did not burn oil, and we needed to ensure that the engine could produce power within 5% of rated hp.
You don't need to thrash the engine to break it in properly; you do need to open the throttle up to increase combustion chamber pressure enough to affect piston ring tension against the cylinder wall. To me, that means WOT at low to medium engine speed. Intermediate cycles of engine braking work the rings both ways in the piston ring grooves, and counter overheating. I have successfully run-in new and rebuilt engines this way without issue. ____________________ History shows again and again how nature points out the folly of men - BOC
Last edited by jeffyjeff on 07:56 - 20 Jun 2023; edited 1 time in total |
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Old Thread Alert!
The last post was made 1 year, 1 day ago. Instead of replying here, would creating a new thread be more useful? |
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