Little end bearing

[Butcherbird]

Hi, Just discovered I have a cream-crackered little end bearing and have looked through a couple of manuals I downloaded but nothing much is mentioned about them.
Is it possible to get a bush fitted or do I need a new conrod?
There is a crank and rod currently on ebay for £50, says it came from a 3AJ, would that fit a 34L?

[ActionManMelb]

There has been plenty of discussion about the con rods. Basically there are 3 types (34K-3AJ-3TB)and you must match the number stamped into the rod.

None of the bikes use a little end bush, but the rod end is flash coated with copper. I have been meaning to get my local electroplater to re-plate some old ones.
You might want to try this.

[marcm]

Mine was fucked when I got mine in 2011,had it a part and put a rod in it,discovered oil blanking plug in right hand side of output shaft was laying in bottom of clutch cover....oops..surprised it hadn't died sooner realy.

[Butcherbird]

Just had a look and mine doesn't seem to have anything stamped into the con rod but it has '5Y1 E' on the side of the rod in raised lettering as part of the casting.

[marcm]

That's what your looking for,I got lucky and found a new old stock rod and bearing on ebay for about 20 odd quid,result,and rebuilt my crank.
I think you will probably lucky to find another crank that's got a rod much better than what you've already got maybe.

[ActionManMelb]

Hmmmmm....5Y1 is the code for the XT550. It will still interchange with '83 600cc motor.

[marcm]

Yes quite a few of the engine parts have 5y1 on them so assume yamaha wanted to use stuff up,I've an oil pump allegedly from a 3aj,it has 3aj on gear and 5 y1 on body??...

[Mezo]

If its 3AJ oil pump it will have stamped on one side 5Y1 & importantly 3AJ on the other, this was from a 3TB from memory?





This was a bargain at 15 euro`s (like new) & will be going in my 34L

50% more oil flow with a 3AJ pump guys.

Mezo.

[Butcherbird]

Found another crank and rod on ebay from an 85 34L so will have a go at that.

[marcm]

If its 3AJ oil pump it will have stamped on one side 5Y1 & importantly 3AJ on the other, this was from a 3TB from memory?





This was a bargain at 15 euro`s (like new) & will be going in my 34L

50% more oil flow with a 3AJ pump guys.

Mezo.

Well done mezzo..I've just spied the 3aj behind the plastic drive gear on the one I have here,been sitting on the bench for months..will stick it in when get time..