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quick question-do you need to run crank bearings in?

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spitfire123
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PostPosted: 12:16 - 03 Jun 2009    Post subject: quick question-do you need to run crank bearings in? Reply with quote
hi all,

as the tital says??

never replaced them before and now i have done on my mito i was justw ondering if i should do below 6k for 25km or somthing?

cheers Thumbs Up
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temeluchus
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PostPosted: 12:18 - 03 Jun 2009    Post subject: Reply with quote
id take it easy for the first hundred miles to let them loosen up.

Dont try and set any lap records till then Wink
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spitfire123
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PostPosted: 12:22 - 03 Jun 2009    Post subject: Reply with quote
Temeluchus wrote:
id take it easy for the first hundred miles to let them loosen up.

Dont try and set any lap records till then Wink


ok cheers matey....ill take it easy for a while Thumbs Up
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arry
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PostPosted: 12:24 - 03 Jun 2009    Post subject: Reply with quote
As above. Just take it easy for 2/300 miles and then start to build up th revs/load from there.

Only really need to run rings in for any real length of time (and even then there's an argument that says you don't).

A lot of people say no running in required at all because they don't touch the crank and run on the oil film - which is all very well but how do they wear in the first place if that's the case? You could say because they wear, but what wears them - oil?

My argument is there's no harm in being on the cautious side, so that's what I would recommend
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Gawain
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PostPosted: 12:32 - 03 Jun 2009    Post subject: Reply with quote
Id think if there was any wear in new bearings that would mean they were worn out? Cant hurt i guess but i dont think its necessary.
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Blue_SV650S
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PostPosted: 12:38 - 03 Jun 2009    Post subject: Reply with quote
Do you mean main bearings or big end bearings?

Either way, yes. With 2-strokes, its always a good idea to put a bit of extra 2-stroke in the fuel tank when running in new bearings or bores/rings just to give them a bit more lube on the initial few miles.
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Pete.
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PostPosted: 14:37 - 03 Jun 2009    Post subject: Reply with quote
Are we talking about the main bearings that hold the crank in the cases? These need no bedding-in.
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sickpup
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PostPosted: 14:42 - 03 Jun 2009    Post subject: Reply with quote
No you don't need to run them in.

Does anyone ever run in wheel bearings?
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arry
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PostPosted: 15:36 - 03 Jun 2009    Post subject: Reply with quote
sickpup wrote:

Does anyone ever run in wheel bearings?


Well no, but they're completely different?
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Blue_SV650S
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PostPosted: 16:19 - 03 Jun 2009    Post subject: Reply with quote
arry wrote:
sickpup wrote:

Does anyone ever run in wheel bearings?


Well no, but they're completely different?


For a starter wheels only turn at the fraction of the speed of a crank Wink

But also tolerances in wheel bearings are prolly not as important ... that and they don't run as hot ....
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Blue_SV650S
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PostPosted: 17:16 - 03 Jun 2009    Post subject: Reply with quote
BLUEX5 wrote:

Yes, very clever. Make your freshly rebuilt engine run lean - that'll stop it nipping up in the first few miles yes?

Anyway - running in roller bearings - don't bother. Take it easy for a few miles but only to make sure you've assembled everything right and that oil is going in etc.


Clearly 'a bit' means the whole bottle to you does it??? Rolling Eyes

Besides, I suspect you'd be putting the plug out with excess oil before 'running lean' would be a problem???? ...
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Pete.
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PostPosted: 18:10 - 03 Jun 2009    Post subject: Reply with quote
Blue_SV650S wrote:
arry wrote:


Well no, but they're completely different?


For a starter wheels only turn at the fraction of the speed of a crank Wink

But also tolerances in wheel bearings are prolly not as important ... that and they don't run as hot ....


Bearings are bearings, they are classified by an ABEC or ISO rating.

There's going to be no difference between wheel or crank bearings, quality-wise, in a standard motorcycle. The lowest-rated ABEC-1 is perfectly acceptable, the differences between those and the best is clearance in microns.
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sickpup
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PostPosted: 20:55 - 03 Jun 2009    Post subject: Reply with quote
Blue_SV650S wrote:
For a starter wheels only turn at the fraction of the speed of a crank Wink

But also tolerances in wheel bearings are prolly not as important ... that and they don't run as hot ....


Welcome to 2009, nice to finally welcome you here. For at least the last 20 years bearings haven't needed to be run in due to close tolerances.
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spitfire123
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PostPosted: 20:58 - 03 Jun 2009    Post subject: Reply with quote
hi all,

crank bearings (what sit in the crank casing)


and ye si did put extra 2st il in the tank aswell a sthe injector.

did 48km erleyer more or less bellow 8km.

all is good Thumbs Up
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