clutch and primary drive gears

[hrc43]

is it important that the primary drive gear matches the clutch basket gear?i need a new basket but dont know if i need to get the primary drive gear as well.oh and how can you tell if they match.cheers

[winnerevo1]

There is a backlash mesh number engraved on the back of each of the gears. These two numbers have to be 155 +/- 1 when added together.

I've heard it said that it doesn't matter but that is the Yamaha spec so I'd go with that for safety sake.

If you change just the basket (a billet basket would be a good idea) onto your old gear then you wouldn't need to source another primary gear.

[hrc43]

i need a new basket because there is a tooth missing on the gear,so it sounds like i need both thanks for the info

[Shytalk]

I have a matched set if you need one, the basket needs the edges filing a bit but other than that is all good to go.

[hrc43]

thanks shytalk but i have just bought a pair on evil bay this afternoon .

[ulsta]

Found this, should help work out the gears you need.

[winnerevo1]

Sept 10, 2013 23:55:59 GMT 1 ulsta said:

Found this, should help work out the gears you need.

Unfornutnately that is wrong. There was a discussion on another forum where it was deemed that the Yamaha manual was wrong due to the common backlash numbers in use. The general consensus was that it would be virtually impossible to acheive the number quoted by Yamaha with the numbered baskets/primarys available.

I've never seen primarys numbered as low as 60's. 80's - 90's are common.

155 +/- 1 has been the accepted rule...

[Tone]

What model are we referring to? The chart shown by ulsta is the same one as shown in the Genuine Yamaha workshop manual I have for the 4L1/4lO models but the Genuine manual for the LC2 shows the backlash tolerance as listed as 155+/-1.

[winnerevo1]

YPVS and LC clutch baskets are exactly the same part, as are the primary gears.