Run it in or thrash it?

[california_rookie]

Recently, a friend of mine was regailing me with a tale of two identical bike, one of which had been properly run-in, the other of which had been thrashed to within an inch of it's life. The results of which, supposedly scientifically obtained, were as follows:

Bike #1 - which was run in porperly - ran exactly as anticipated.

Bike #2 - the unlucky thrashing victim - made more total horsepower but developed an internal oil leak.

Anyone heard of anything of the sort or have any evidence as to how this story might be confirmed/disproven?
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[Frost]

There are sites which detail a thrashing style of running in this normally envolves putting the bike on a dyno and opening upt he throttle to various positions and holding it there. It is said to give a better seal, but the argument against it is that it overstresses the engine expecially if it has new components. Personally i would adopt an aproach of try and ride the thing normally, but Don't thrash it untill you have a couple of hundred miles under your belt.
I really can't see the harm of revving a bike to 6000rpm rather than a recommended 5000, or thrashing it 50 miles earlier than the manual says

[california_rookie]

Agreed. For the first 1000 miles I just kept creaping slowly up on the redline, phasing in a little more of the throttle day by day. Now the damned thing's making clicking sounds from the top end and has already been to the shop once. What the hell'd I do wrong?
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[divuk83]

Just warm the bike up properly then ride it however you want!

Dave

[TheShaggyDA]

Might be referring to one of the articles here :-

https://www.mototuneusa.com/
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Current: CB500 Previous: CB100N, CB250RS, XJ900F, GT550, GPZ750R/1000RX, AJS M16, R100RT, Enfield Bullet

[i:6e3bfc7581]But still I fear and still I dare not laugh at the madman...[/i:6e3bfc7581]

[tintin]

This is the article:

https://www.mototuneusa.com/break_in_secrets.htm
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[iCraig]

Some do say thrashing it from new gives you a better seal round the piston rings and the bore etc, and if you leave a it a few hundred miles the honing on the cylinder bores has been worn off so they don't create a proper seal.

In my opinion that is rubbish, because thrashing it from new means it will wear quicker as there are little particales of metal in the engine as its new etc, and it will also overstress the engine too.

[instigator]

I'd do my own breaking in period, probably about half or quarter of what the manufacturer says, just ensuring that WHENEVER I ride the bike, I warm it up completely.

Having said that, I tried to ride with the choke on the other day, no wonder I was going so slowly

[CBRPETER]

lol. I wouldn't thrash it early just for the reason that i payed a shit load for it and i really don't want to wreck it, then on the other hand all this talk about clicks and unsealed pistons and bore have made me confused.
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[Rory]

The one you really want to read is this one;

https://www.mototuneusa.com/circular_logic.htm
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My Old CBR400RR | Bike Oil FAQ | Petrol FAQ

[stinkwheel]

New bike or new bearings, serious top/bottom end work I would take it easy for the first bit.

A simple case of new rings and a quick hone or a rebore (on alloy engine) and new piston without a bearing change for a previously run-in motor. I would consider the high-rev running in technique using mineral oil and changing it + filter after 20 miles or so.
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I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[sickpup]

[iCraig]

[sickpup]