43 Tooth Rear Sprocket

[DaveH]

Have just bought new C&S for the Corsaro and gone for a 43T rear

In case anyone is interested, here are the important numbers
Bolt Holes = 6x M10
Centre Boss = 121 mm
PCD = 140mm
530 chain size.

I ordered mine from Scott at Talon engineering - arrived next day £31 delivered - not bad considering they had to machine the centre out of a mainstream model sprocket. (their reference - 309-43-530)
Hard anodised gold alloy - looks a treat but ain't tried it yet cos I've whipped the tyres off and painted the wheels a classy shade of gold.

Should be back together early next week.

Dave H

[franky]

Good info there, how many teeth standard? I might go for a tooth up on the rear. Talon are normally really good quality.

[DaveH]

40 teeth as standard - a 43 is roughly equivalent of going down 1 tooth on the front - usually benefits most bikes and is a mod I certainly do to all my bikes that are geared for daft top speeds.

Usually go down one at the front to avoid changing the chain, but as my existing chain was marginal and struggling to find a 16T front for the Morini, opted for a 43T rear. Advantage of this over the smaller front is that the front sprocket wear is significantly reduced.

Bikes back together now with a new set of tyres so will report back when I've had chance to try it out....

Dave H

[DaveH]

First impressions of the 43T rear :-

Not as urgent straight off the bottom end as I expected - whether thats me being a pussy with the throttle or the fact that the motor is 'revving' rather than 'punching' or not I'm not sure. Have had the same thing with off road bikes when overgeared, means you are chasing horsepower instead of torque.

What is certain is that the motor is much smoother around town and when travelling slowly (??). Top gear roll on is mind blowing - actually had me fishing for another gear as it felt like it was in fourth !

Going to stick with it for a bit - love that top gear now, pulls from nowt to the red line like a train.... :

Overall I don't think the factory got it far wrong with the stock gearing - they're probably not as concerned with drive by noise tests as the Japs...

Certainly more civilised if you have to ride in town for any length of time

[franky]

Have you had your bike mapped on a rolling road? that was the best thing I did as the bike use's less fuel makes more power but more importantly it fuels like its suppose to allowing you to use the torque of the engine.

Might be worth a set up session at a rolling road?

[DaveH]

No, not had a Dyno set up on - where did you get it done ??

Do you know what software is needed to remap the Morini ECU ??

Have you got a copy of the map ??

Have just got hold of a Tuneboy adapter for the Morini and have retrieved the factory map from the ECU and sent it off to Wayne at Tuneboy for conversion. When he has had chance to look over it, I should know whether the Morini ECU is full compatible with the Tuneboy software, including diagnostics - (am holding off purchasing the Techno research kit untiil I get a definitive answer)

Dave H

[franky]

I had a power commander fitted followed by a custom set-up on a rolling road, seem the most cost effective solution.