fish tailing like mad

[fizzwheel]

Originally Posted by TazDaz

Won't this cause the rear to try and spin quicker than the front???

No, Whats turning the wheel if the throttle is shut ?

The only thing that makes back wheel turn faster than the front is the application of the throttle. Which if you are braking is shut.

Whats happening is that the engine revs are trying to match the speed of the back wheel when you let the clutch out.

I.e if your diong 50mph in 6th and then knock it down to 3rd, then the engine revs will rise till the engine is turning the rear wheel at an appropriate speed that gives 50mph in 3rd gear for example 9000 rpm, which is why the revs rise.

Basically you lock the back wheel and thats why alot of people blip the throttle on down changes so that the engine is revving at the appropriate RPM for the gear that you want at the speed you want, so you dont lock the back wheel.

Apologies if I havent explained this very well and we've derailed the OP threa now...

[flymo]

Originally Posted by TazDaz

just I thought this was one of the reasons racers use the rear brake quite heavily!

Actually they dont

Originally Posted by TazDaz

Obvisouly this could be nonsense, I'm not an expert or owt - just I thought this was one of the reasons racers use the rear brake quite heavily!

If you're hooning down the road, apply the front brake so the weight is on the front, but at the same time knock it down a few gears which will cause the revs to shoot up. Won't this cause the rear to try and spin quicker than the front???

no - lower gears are for lower speeds; at 40 mph in 4th, you are running 4000 rpm on an SV-s with standard gearing. Clonk down to third and this goes up to around 4900 - 5000 rpm with increased engine braking...its this increase engine braking that is trying to decelerate the rear wheel....essentially, the rear wheel is trying to drag the bike via the engine braking. The lower the gear and hence the higher the revs, the more engine braking and more snakey snakey fun you get. Or not fun, in this case. Racers use the rear brake heavily for a couple of reasons. One is to stop quicker the other is to settle the bike before going into a turn

the lower gear and the higher RPM's still means the rear wheel is going the same speed

welcomed derail as i have learned something new too , never a bad thing

I've clearly learnt something too!

You can probably all tell that I've only been interested in bikes for the past 10months, maybe it was locking up under braking/engine braking that I've confused myself with then!

Apologies for the derail...

[Biker Biggles]

Checked those tyre pressures yet?

still waiting for numpty brains to tip up "i'll be there in ten my ar5e

[DarrenSV650S]

I think you should invest in a tyre pressure gauge

+1 Darren. Never underestimate the importance of tyre pressures

[Richie]

I'll put money on it is the tyre pressures...
happend to me and found out that I had a puncture in the rear tyre.