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Dabbsy

Joined:

Aug 02

Posts: 497

Dabbsy says:

The best way to run a bike in? Discuss

http://www.mototuneusa.com/break_in_secrets.htm

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  • Posted 2 years ago (30 October 2012 14:42)

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jaffa90

Joined:

Mar 09

Posts: 8924

jaffa90 says:

Run-in

I`ve had a few brandnew bikes and found that the best way is to vary the engine revs up to halfway to the red line (that`s 5,000rpm with red line at 10,000rpm) for 250 miles then up to 7,500 rpm for the next 250miles then whatever without touching the red line.

Never run in an engine at constant speed so keep off the motorways.Keep blipping that throttle as i have found and you`ll notice a better response and better engine breaking when shutting off. :smile

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AdieR

Joined:

Apr 08

Posts: 3042

AdieR says:

This has

been on before.

I personally tend to follow manufacturers guidelines - they'll be more clued up than a back street mechanic or "someone down the pub".

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James600zx

Joined:

Sep 07

Posts: 2812

James600zx says:

Breaking in.

Yep, discussed here.

Interesting but still no real evidence provided, just too many words.

Why does it keep saying, "Why would the manufacturer recommend (blah),... this is a good question..." without giving the answer?

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smidget

Joined:

Nov 07

Posts: 2421

smidget says:

James600zx

Too many words and no answers.

The answer is that if you disregard the manufactures running in schedule you will end up by polishing the cylinder bore and the piston rings will suffer premature wear.

The purpose of the break-in is to 'lap' the cylinder wall and the piston rings together to form a working seal.

Rapid wear of these components result in the loss of performance.

Hope that answers your questions.

 

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James600zx

Joined:

Sep 07

Posts: 2812

James600zx says:

Smidget.

They were rhetorical questions but yes, I'll go with the manufacturer's advice if I ever have a brand new vehicle that isn't a bicycle <sniff!>. I need proof! Evidence! Surely if you have access to loads of bikes and a dyno you'd have all that. Like you, I am unconvinced by the link.

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bbstrikesagain

Joined:

Nov 08

Posts: 879

This old chestnut..

..what are you running a bike in for?


Longevity, reliability, reasonable oil consumption? Mineral oil, mixed revs, not too much throttle, gradually built up as per manufacturer's instructions, then semi or fully synth as required.  Some honing should be left on bores etc, which helps lubrication but can allow some blow by.  I believe there's plenty of evidence it works well, even if it doesn't look quite as shiny and clean...

Maximum power in minimum time?  Follow mototune for polished bores and no blow by, then run on top notch race oil for a season (or until siezes?).  I believe there's plenty of evidence it works well for race engines.  WRC engines are bedded in a similar manner, but not expected to last a decade or more...

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SlowLearner

Joined:

Feb 10

Posts: 1953

SlowLearner says:

Breaking her in ;)

Done this several times, but let's get back to the bikes for the moment:

I've found that gradually increasing the revs and load, with plenty of changes in gear, have seen my engines feel a lot more smooth that those I haven't broken in myself.

Personal preference is to give about twice the manufacturers' time/mileage... wouldn't think of really looking for the maximum until maybe 10,000 miles,  so why cane it before it's even done 1000?

[Ed note:  originally stated 10K revs above, instead of 10K miles.]

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