hi all i was just wondering how do you change the center main bearing one the crank shaft looking at the pics in the bottom end rebuild section it looks like you cant change it any one know if you can and how

thanks

The crank has to be split and rewelded true, it's a specialist job. Whether it's as good as a new crank is open to discussion, most people (including Honda) say you shouldn't replace the big ends at all either as the pin is part of the web, but it can be done.
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i had mine done lasted about 3000 miles then went again, personally i think it is a false econemy, wouldnt do it again.
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MC21SP - Roth-tax
CBR400 - track
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any body know the price on a new crank shaft and where i might be abile to get one in australia

and one more thing do the come with the bearings

you can get them from Tyga performance, i've just had to buy one from there
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold

nsrmonkey wrote:i had mine done lasted about 3000 miles then went again, personally i think it is a false econemy, wouldnt do it again.

It's true, but don't forget your's was split at least twice to have all bearings replaced and looking at the quality of the bearings that had been fitted when you seized it you've got to cast doubt on the quality of the first rebuild
Or maybe I'm just being a little blinkered and unwilling to accept the truth as mine looks like it's had a big end done
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My crank needs a rebuild/replacing as well. Does anybody do rebuilds in the states? I called Eric Gorr but they only do cylinders
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To much HP is barely adequate!

fontyyy wrote:

nsrmonkey wrote:i had mine done lasted about 3000 miles then went again, personally i think it is a false econemy, wouldnt do it again.

It's true, but don't forget your's was split at least twice to have all bearings replaced and looking at the quality of the bearings that had been fitted when you seized it you've got to cast doubt on the quality of the first rebuild
Or maybe I'm just being a little blinkered and unwilling to accept the truth as mine looks like it's had a big end done

didnt think you had to split the crank to do the outers
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As I (don't?) understand it the outer 2 mains no, but either big end or the middle main yes.
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if thats the case then mine was only split once, as i (dont) LOL understand it either jam said it was only the outers that had been bodged the big ends were still original..

who knows eh , all i know is that if my crank went again (please no) i would be putting a new crank in
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold

Twice, once to bodge it pre you getting it and again to put it right

However I did think they were all done (big ends as well) so I stand corrected there, but it's irrelevent as the mains went again.
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If you're located in Australia, contact MRRGV as he is located in Melbourne.

fontyyy wrote:Twice, once to bodge it pre you getting it and again to put it right

However I did think they were all done (big ends as well) so I stand corrected there, but it's irrelevent as the mains went again.

fair point doesnt matter anyway
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold

I dont see why a crank cant be rebuild as good as new as long as decent bearings are used and the big ends are ok. We've build loads of 2 stoke cranks and they never give any trouble, mind the tripples are alittle tricky to true up after..
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If I have to take the carbs off once more...