Hi guy`s
I`m going to try to rebuild a crank i have a crap one to try on first.
There is probably a few people on here that have done several . So I was hoping that use could share your knowlage here.
How u striped them to how u put them back together and get them balanced right.
I think this would help a few people out. I have rebuilt a few dirt bike cranks but they are easy to get right as they have always had holes to put a pin in to get them back in the right spot and the nsr`s don`t.
Cheers everyone

Is it really SO MUCH to ask that, you post in plain English. I've had enough of editing your posts.

This is the last time I ask you NOT to use shorthand.

I can't speak for others, but personally I can't be bothered to even read shorthand, let alone answer it! I can tell you though that it's not easy for speakers of a foreign language to read, which is why it's not to be used here.
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!

Well said Andy, whenever i read any thing like that, it makes me think that someone wrote it who never bothered to read and write properly. No offence intended!!!.
_________________
Proud Father of , 05 ktm 400exc supermoto 2018 honda crf rx supermoto

sorry that i am not a english teacher or a writer . I do try

You don't need to be an English teacher; just stop using shorthand please.
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!

Hi, it's really easy to rebuild cranks on NSR's.

Send them off to someone that can do it. Even on simple LC cranks you are better off getting someone who has build 100's of the buggers to do it, as the only way you'll find out that you've messed up, is when you've rebuilt the engine, fitted it etc and started it up. I've seen poorly rebuilt cranks last 40 or 50 miles, so adding to the extra gaskets and rebuild, you now have to get the bike home!

I did look at buying a press, V blocks, decent DTI etc etc for doing singles but in the end, its a lot of hassle for not a lot of gain (in saving).

It's also why I don't spray, or weld aluminium. Got people who can do that bloody well
_________________
More **** two strokes than you can shake a **** stick at.

yes i see your point . But the cheapest rebuilt crank I can find in australia is $700au when you can buy the bearings for $200au is a big difference .
I have three spare cranks if i rebuild them I have a spare motor and crank for my race bike.

**** only charge $610 or $630, I can't remember the exact amount. The extra $400 or so on top of the cost of the bearings is an absolute bargin. The tooling required and skill involved is well worth the $400.

Andy

Bandit7

****** is $725 plus freight
I got a new one for just over $800 plus freight . I thought the extra $75 for a new crank was worth it.
The thing is I have the cranks so I want to try .
There must be people that do there own here.
I have rebuilt dirt bike cranks with good results . So i think it would be worth trying.

Rebuilding cranks is not super difficult, and the tools needed are not so high tech, but experience pays huge dividends. It's about knowing where to tickle it and how hard.

Ive got a dedicated NSR250 crank jig, which allows me to press the centres together with the big end pins in perfect alignment. It's fascinating that you can take a brand new crank, pull off the out wheels and then find that it doesn't fit in the jig because it was pressed together at the factory out of alignment. Hmmm.

To true up the wheels you need to know what the dial gauge readings mean, and then where to "adjust" it. You also need to know when it's time to call it quits.

Matt@TYGA wrote: It's fascinating that you can take a brand new crank, pull off the out wheels and then find that it doesn't fit in the jig because it was pressed together at the factory out of alignment. Hmmm.

If it was dropped from more than say half a meter, that'd be enough to whack it out of balance wouldn't it?
I doubt Honda assemble cranks less than perfect. I could be wrong.

I agree that properly rebuilt crank is worth nearly what a new one is. You can't beat experience, the right tools and professionalism.

I've often wondered how high you can drop a crank before it makes a difference. Not that I'm gonna try it though.

If you doubt that Honda assemble cranks anything less than perfect then it'd be worth measuring one. All said and done it's a production part and if they aligned them like an NSR500 crank you could expect to put a zero on the end of the price tag.

I have to say that these days things are better with NSR cranks. I reckon they have a new jig, or a new boy assembling them, but cranks from a couple of years ago were not that clever straight out the box. They were OK but I wouldn't have put on in my bike without smacking it around a bit first.

Same holds true for the RS250 crank. My just unwrapped, out of the crate from HRC crank wasn't all that balanced.

nsrdownunder wrote:
yes i see your point . But the cheapest rebuilt crank I can find in australia is $700au when you can buy the bearings for $200au is a big difference .
I have three spare cranks if i rebuild them I have a spare motor and crank for my race bike.

Some valid points here, from everyone. The thing is, not only can a trued NSR crank can make a hell of a difference, but if it fails in 40~50 miles like 2Smoke says, it can cause huge mechanical and financial woe!

Those rebuilding cranks have almost certainly gained their experience at the great expense of others... hopefully employers who have trained them and not customers!

As Paul says, it's one of those things you would be much better off sending to an expert who's already got the time, costs and experience behind them.

I'm a huge advocate of doing whatever you can yourself, but as Matt says on this one, the tools aren't expensive (although a dial guage can be), but the experience is invaluable.
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!

Andy wrote:but the experience is invaluable.

So, is it worth learning the hard way?

and lets face facts, no matter what we're told, no matter how many well meaning posts are on the forum, experience is what counts...........
_________________
Please do not PM me technical questions, if you can't find it on the Forum start a thread