wr 426 gears in yz 426?

[motogps]

While Iv'e got this motor apart does anybody know if I can swap wr 426 1st and 5th gears sets into a yz 426 and what is involved in doing so? ( third gear let go so I have to get some new gears anyway)

 

[02yz426f]

should be ok. If I remember right, the only difference between the yz and wr in that area is the number of teeth on the sprockets.

 

[motogps]

That's what I was thinking.

 

[02yz426f]

I'm unsure now. I went to the yamaha website and for the yz426 it says it has a "5-speed w/multi-plate wet clutch" transmission while the wr426 has a "Wide-ratio, 5-speed w/multi-plate wet clutch" tranmission. The primary reduction ratios are the same if anyone knows what that means, but the secondary reduction ratios are different because of the different sprocket sizes.

 

[dales298]

Without getting technical, primary reduction refers to the gears on the crankshaft and the clutch hub. Secondary reduction refers to gears in the transmission.

Dale

 

[02yz426f]

So can he use the yz gear set in the wr?

 

[76GMC1500]

I think you can swap the entire sets. I wouldn't change out individual gears, though.

 

[SFO]

in drive/driven pairs, switching is fine.
also the 2st 250 gearsets swap in.
what is the goal?