NC30 Headrace Change - How To?

[xivlia]

no actually its 50 Nm, least thats what it says in my book

[porndoguk]

no actually its 50 Nm, least thats what it says in my book

Correct you are, ironically i had a look earlier and i read the torque ratings only to mix it up with hub bolt of 55nM

[Neosophist]

Your bearings are located properly right and all the surfaces are clean?

If they were at an angle id imagine youd reach a cliffedge with tightening so it suddenly becomes super tight.

I only user ball bearing races now and dont bother with taper rollers. For all their offered benefits. they can be too finicky and easy to break.

Maybe the cages are twisted? Like above, you only need to tighen to take the play out so there is no movement of the steering stem.. MUCH easier to do with the forks out so you only have the weight of the yokes to move about.

Try moving them up and down until there is no freeplay.

If you cant perhaps as I said the bearings are not square, or they are damaged

[Drunkn Munky]

Neo, what are the benefits of tapers? personally i hate them, ball bearings are much easier to install i cant see any point in using tapers.

[speedy231278]

I think they're mainly marketed as being a cheaper alternative, aren't they? £19.95 plus VAT for a single genuine ball one, and about the same price on eBay for a pair of tapers.

I assume the balls are sealed? My I put new ones in TZR125, genuine Yamaha parts. Balls are loose and you need to use the bearing grease to stop them escaping when putting the yokes in... lol

[porndoguk]

No ball races are open type on the 30, looking back i wish if spent my money on genuine oem, but in all fairness i think mine are ok im going to nip them up later see if theres any play, fit forks which will give me a better leverage to test for further play.

I was only asking what level of tightness is required absolutely free and loose feeling or tighter with a little less freeness.

Ie if i push fast and hard should it spin on its self or require me to push it through the full rotation?

[Neosophist]

No ball races are open type on the 30, looking back i wish if spent my money on genuine oem, but in all fairness i think mine are ok im going to nip them up later see if theres any play, fit forks which will give me a better leverage to test for further play.

I was only asking what level of tightness is required absolutely free and loose feeling or tighter with a little less freeness.

Ie if i push fast and hard should it spin on its self or require me to push it through the full rotation?

Especially without forks, if you push it it should swing freely. You only want to take out vertical play, side to side should be like silk.

Taper rollers are often cheaper as they are mass produced on a huge scale lately, they can be much more expensive.

Taper rollers have a number of benefits. this if from my head and ive had a feww beers now so there could be factual errors..

They have a greater suface area of the bearing in contact with the hub.. the bearings are cylinders rather than balls so instead of a small spot of the ball you have the whole lenght of the cylinder rubbing.

escecially with bangs like pot holes etc, this can cause the smaller bearings to tap a dent into the bearing race surface and create notches, taper bearings have less trouble than this.

for the same reason as surface area they generally last a lot longer too if cleaned / checked.

They are usually more difficult to install, needing a proper drifiting tool or risk of being knackered.

any decent machine shop should do it

[speedy231278]

I can vouch for ball bearings damaging shells. I had a good notch in mine on the TZR which is why I replaced them. The difference was ridiculous. Mind you, I had wrapped the front end of the bike around a tree previously, so I was very lucky to get away with only bent stanchions and iffy bearings!

[xivlia]

They are usually more difficult to install, needing a proper drifiting tool or risk of being knackered.

any decent machine shop should do it

or MEE! :D i can do it! and if i can....EVERYONE can... and that my friends... is a fact.

[porndoguk]

They are usually more difficult to install, needing a proper drifiting tool or risk of being knackered.

any decent machine shop should do it

or MEE! :D i can do it! and if i can....EVERYONE can... and that my friends... is a fact.

In that case going on other work youve done. You've fecked them.

Only kidding they aint hard to fit, best way ive found driving them on is slide it down the stem turn up side down and tap the bottom of the stem into the bearing using the jaws of the vice as the anvil so to speak i did it in rotations of 12,6 & 3,9 Oclock

Rick