Offset timing key
 

Hi, Has anybody fitted a offset timing key to a pointy SV and what were the results, the JHS dyno chart shows a huge improvement to the torque at lower revs?

Anybody done this mod.

Kash

I've done it for my '00 model, it was one of the earlier mods I did... Very nice mod, cheap but not for the beginner I think. And basically the resul is as you've seen on JHS, the torque comes on far lower in the revs. I don't think it did a thing for me at the top end, but the low and midrange is much stronger, great for real world riding. My bike will pull fairly happily from idle without the clutch :)

I had one on my pointy SV. I liked the effect it had on the throttle, a far smoother response, less on/off from closed or when trying to balance your revs when going into a corner. Probably made it more like an IL4. And the power was more progressive like a 4.

On the downside mine actually sheared. Before anyone says anything about installation, it was put in by a qualified engineer who owns and runs a Riding school and does all his own mechanical work. One of the guys who works for him is an ex engineer off the rigs & both inspected the bits when it broke. The opinion was that the metal stretched and then when I stalled the bike, it was the final nail in it's coffin & it broke. They both agree this was caused by inferior material being used. More than a couple of people have had this done with no complaints so it may be an isolated incident.

It could have had catastrophic effect on the engine and as you had modified this, it would invalidate the warranty. Just be careful of what you put in there.

The key material should be almost irrelevant, since it should serve only for alignment on assembly.

There should be no forces through a shaft key, all the force must be taken on the taper friction.

Keys shear because the male and female parts of the taper were not degreased or were damaged in some way. IMPORTANT - the taper parts MUST be degreased, preferably with an aerosol degreasing agent, and bone dry on assembly

A key will NOT take all the drive (for "drive" read torsional reaction from the rotor) if the taper isn't mated up correctly, whatever it's made of.

One thing you must check very carefully with these offset keys is that it's not holding the taper apart at all (e.g. if the stepped section is too tall for the rotor keyway).