14 tooth on 1100 evo

[Rrawlings]

Before I get a 14t sprocket does it make a difference in usability? I’ve never used 6th and find slow moving and 30mph are awkward. The fuelling isn’t as bad as I thought and now I’ve learnt how to ride a twin again it’s an absolute pleasure of a bike just find it over geared really. I’m sure Luddite will be along soon with his wisdom.

Cheers in advance guys. So glad I bought it now

[chris.p]

I use a 14t front sprocket on my 1100 Evo, my observations are.

1/ Better initial pickup and acceleration with smoother low speed town work (even better with Rexxerr flash).

2/ Very little loss of top end, not that you are supposed to be going that fast

3/ No real cons, some say it makes the chain rub on the swing arm, i fast road ride also the odd track day and never had an issue.

4/ It is far cheaper to put a 14t front sprocket rather than a 3t larger rear sprocket and new chain to suite on.

[Rrawlings]

Cheers Chris better pick up sounds interesting it’s easy to get the front up as it is without trying over the smallest of crests

Chain and sprockets were new when I bought it in April so can’t see the point in swapping it all.

[Luddite]

Originally Posted by Rrawlings

I’m sure Luddite will be along soon with his wisdom.

Cheers in advance guys. So glad I bought it now

I can't add anything more to what Chris has said. He's summed it up perfectly and my observations exactly match his, with the 14, and yours, with the 15.

It was the first mod I carried out to try to smooth out the low speed running. In standard trim, the bike is definitely overgeared, (presumably for noise testing purposes), and lowering the final drive makes it much more usable.

Even though my remap and heavier flywheel means it would probably now happily pull standard gearing, I'd still go with the lower option for the increased thrust it gives at the back wheel.

Glad you're enjoying it, anyway!

[Mr Gazza]

Originally Posted by Rrawlings

Before I get a 14t sprocket does it make a difference in usability? I’ve never used 6th and find slow moving and 30mph are awkward.

I find this hard to believe, as my little 900 will pull 6th easily and go down to 30 in top comfortably too, pulling away from that is possible with no down change so long as the throttle is eased on with feeling. (But would normally pop it down a couple when the speed limit ends!)
I'm one tooth down on the rear sprocket as well, so very slightly higher than standard for that year.

Have you actually counted the teeth on your rear sprocket to see where you are with it? a previous owner could have geared it up for you?

[slob]

your 900 wasn’t trying to get through 2011 emissions regs

[Mr Gazza]

Granted, it's a 2000 model.
So how does giving a bike a gear it can't pull, help with emissions? I though all that was to do with the drive by noise test?

I would still check the rear sprocket teeth anyway.

[Rrawlings]

Cheers guys. I have one ordered so will get it on this week when it arrives. Had a great tour of the lakes, and dales taking in kirkstone pass and hartside pass with my dad this week and it was a 250 mile trip and the bike was brilliant just want to make it that bit better on slow speeds

[Luddite]

Originally Posted by slob

your 900 wasn’t trying to get through 2011 emissions regs

Originally Posted by Mr Gazza

Granted, it's a 2000 model.
So how does giving a bike a gear it can't pull, help with emissions? I though all that was to do with the drive by noise test?

I think slob is using 'emissions' as shorthand for all the emissions/noise regulations contained in European Directive 97/24/EC. This stipulates how the noise test is carried out and probably explains the reason why Ducati have over-geared the bike i.e.

The bike is accelerated flat out between two points 20m apart from a steady 50kph in second gear and then again in third gear after which, the throttle is shut abruptly. The average of the noise readings for both gears is then taken.

With the higher gearing, the bike accelerates less and produces less noise during the testing process.

If the Evo were just carrying higher gearing, it wouldn't be too bad but, coupled with the emissions paraphernalia of exhaust valve, weaker mixture and closed loop hunting and surging, (plus the lighter flywheel), these things all add up to produce horrible low speed running.

Originally Posted by Mr Gazza

I find this hard to believe, as my little 900 will pull 6th easily and go down to 30 in top comfortably too, pulling away from that is possible with no down change so long as the throttle is eased on with feeling. (But would normally pop it down a couple when the speed limit ends!)
I'm one tooth down on the rear sprocket as well, so very slightly higher than standard for that year.

Like you, Mr Gazza, I had a 900 Monster (2001 i.e.) and, like you, I remember it being a lot sweeter low down than the Evo. I think the reason for that is, (ignoring the lower capacity), as well as being unencumbered by Euro3 restrictions, the M900, despite having the same stock final drive ratio of 15/39, actually runs lower overall gearing:



So, at 60 mph in top, you'd be doing 3600 rpm on the 900 on Mr Gazza's 15/38 final drive and 3350 rpm on the Evo with standard 15/39 gearing (tables courtesy of https://www.gearingcommander.com/)

1100 Evo


M900

If the M900 has stock 15/39 final drive, then 5th gear on the Evo is virtually equal to top on the 900.

[Doggy]

I've not put a 14t sprocket on my 796 yet, keep thinking about it though .

Will it put the speedo out by much? I guess it will also increase the mileage quicker too?

[Luddite]

Originally Posted by Doggy

I've not put a 14t sprocket on my 796 yet, keep thinking about it though .

Will it put the speedo out by much? I guess it will also increase the mileage quicker too?

Don't worry, Doggy, the speedo sensor is on the rear wheel so no change.

[Doggy]

Originally Posted by Luddite

Don't worry, Doggy, the speedo sensor is on the rear wheel so no change.

Ok great stuff, thanks . I think I'll get one ordered then .

[Uncle Bob]

I'm considering the 14T mod also, as my rough running at low speed wasn't cured by a Rexxer flash and O2 sensor removal. The chain might be a tad loose too. Ultimately I'm still hoping (maybe foolishly) that there's a 'sweet spot' where everything comes together and this bike is brilliant....

[chris.p]

Originally Posted by Uncle Bob

I'm considering the 14T mod also, as my rough running at low speed wasn't cured by a Rexxer flash and O2 sensor removal. The chain might be a tad loose too. Ultimately I'm still hoping (maybe foolishly) that there's a 'sweet spot' where everything comes together and this bike is brilliant....

I went 14t front before rexxerr flash, the feeling low down was better before the flash but night and day different after the flash, so get that 14t front sprocket and give it a go/

[Uncle Bob]

Originally Posted by chris.p

I went 14t front before rexxerr flash, the feeling low down was better before the flash but night and day different after the flash, so get that 14t front sprocket and give it a go/

Yeah I think I've got to at this stage Chris.