Long Stacks v Smaller Sprockets

Image · Post by **Image** » Thu Apr 12, 2012 9:48 pm

Which makes the most difference to acceleration?

tony.mon · Post by **tony.mon** » Thu Apr 12, 2012 9:52 pm

Off the line?
Sprocket.

But you can't use all the power as often, as you have to shut down as the front lifts more easily.

Not a bad problem to have, though.

In third or fourth, grunting out of a corner?
Stacks.

Image · Post by **Image** » Thu Apr 12, 2012 10:06 pm

Hmm, can you have both?
I think stacks prob gets used more then.

Do smaller sprockets cause more stretch on the drive chain?

tony.mon · Post by **tony.mon** » Thu Apr 12, 2012 10:17 pm

No more stretch than normal.
When the chain's stretched to the wear limits it needs replacing. How long that lasts is in part down to the smaller front, but tbh it's much more to do with how often it's lubed and cleaned, whether you ride in winter, etc.
Fit a scotoiler and forget it.

The difference in diameter for the chain to roll round is only a mm or two.

benny hedges · Post by **benny hedges** » Fri Apr 13, 2012 12:37 am

Image wrote:Hmm, can you have both?

Do smaller sprockets cause more stretch on the drive chain?

you can do what you want unless you are insured with bennetts lol!

chain wear - depends on use, proper maintenance, proper lubing, wheelies etc...

have a look at http://www.gearingcommander.com load up the firestorm data and in the custom field, experiment with different sprocket sizes to see the difference it makes...
scroll down, you can see the contacts per revolution.... thas what causes the wear.
it's the number of times the same link hits the same tooth on the sprockets.
ie having a 15:45 set will wear a hell of a lot faster than a 15:41

bad adjustment is the biggest killer though.... slight misalignment will fook the chain.
as will replacing the chain but thinking the sprockets are ok.... they arent lol.
the chain will Immediately wear just the same as the one you just took off!

fit a scottoiler, keep it adjusted and aligned and you should be getting 20-30k from the chain easy.

apart from the fact that a smooth running and well adjusted / lubed chain is smoother and more power efficient, you really do not want it to break on you lol
i snapped one last year,,,, my own fault cos i let it go rusty over winter then just cleaned it and refitted it, even though i had a new set on the shelf....
it damaged my left can, chain adjuster on the s/a, smashed the hugger, smashed the undertray, smashed the gearbox sprocket cover, damaged the clutch slave cylinder and pushrod, but worse, it took out the lugs on the engine where the cover bolts on = no clutch

major work required to repair it (properly) as the damage is on the top and bottom crankcases, so basically it's written off a perfectly good engine.

you have been warned lol

Snoogle · Post by **Snoogle** » Fri Apr 13, 2012 8:44 am

benny hedges wrote:
Image wrote:Hmm, can you have both?

Do smaller sprockets cause more stretch on the drive chain?

you can do what you want unless you are insured with bennetts lol!

chain wear - depends on use, proper maintenance, proper lubing, wheelies etc...

have a look at http://www.gearingcommander.com load up the firestorm data and in the custom field, experiment with different sprocket sizes to see the difference it makes...
scroll down, you can see the contacts per revolution.... thas what causes the wear.
it's the number of times the same link hits the same tooth on the sprockets.
ie having a 15:45 set will wear a hell of a lot faster than a 15:41

bad adjustment is the biggest killer though.... slight misalignment will fook the chain.
as will replacing the chain but thinking the sprockets are ok.... they arent lol.
the chain will Immediately wear just the same as the one you just took off!

fit a scottoiler, keep it adjusted and aligned and you should be getting 20-30k from the chain easy.

apart from the fact that a smooth running and well adjusted / lubed chain is smoother and more power efficient, you really do not want it to break on you lol
i snapped one last year,,,, my own fault cos i let it go rusty over winter then just cleaned it and refitted it, even though i had a new set on the shelf....
it damaged my left can, chain adjuster on the s/a, smashed the hugger, smashed the undertray, smashed the gearbox sprocket cover, damaged the clutch slave cylinder and pushrod, but worse, it took out the lugs on the engine where the cover bolts on = no clutch
major work required to repair it (properly) as the damage is on the top and bottom crankcases, so basically it's written off a perfectly good engine.

you have been warned lol

Thanks for that Benny, left mine out in the weather at some points over winter and come to find my chain looking a bit sorry for itself. New parts required!!

benny hedges · Post by **benny hedges** » Fri Apr 13, 2012 9:11 am

Snoogle wrote:
benny hedges wrote:
Image wrote:Hmm, can you have both?

Thanks for that Benny, left mine out in the weather at some points over winter and come to find my chain looking a bit sorry for itself. New parts required!!

should be a priority tbh, if anything it will teach you to look after the chain lol.
i see loads of riders with the chain dangling down way too slack... you can imagine the damage if it comes off lol.... similar to a broken chain but would also wreck the sprocket carrier and swing arm.

feels like a new bike with a new chain & sprocket set so go on, treat yourself

Vtrkidda · Post by **Vtrkidda** » Fri Apr 13, 2012 11:13 am

Im with bennets

they will n
Ever know

Snoogle · Post by **Snoogle** » Fri Apr 13, 2012 12:23 pm

benny hedges wrote:feels like a new bike with a new chain & sprocket set so go on, treat yourself

Yeh I know, I know...lesson learnt

lol

Image · Post by **Image** » Fri Apr 13, 2012 12:37 pm

Yeah I just been through a winters riding and renewed chain and sprockets. Feels good.

lloydie · Post by **lloydie** » Fri Apr 13, 2012 1:18 pm

Just got back from dyno .
Standard stacks 103.36 bhp
Billet long hrc copy stacks 105.77bhp

AMCQ46 · Post by **AMCQ46** » Fri Apr 13, 2012 2:33 pm

lloydiecbr wrote:Just got back from dyno .
Standard stacks 103.36 bhp
Billet long hrc copy stacks 105.77bhp

Lloydie, looks like you didnt go for a run to Wales then!

As you beat me to it, you need to answer the questions I wanted answered on the dyno:

what was the Midrange like?
what did the fuel / air look like with the HRC bits.......does it need rejetted?

agentpineapple · Post by **agentpineapple** » Fri Apr 13, 2012 5:26 pm

thats nice and healthy lloydie, i'd be happy with that figure with my bike......

lloydie · Post by **lloydie** » Fri Apr 13, 2012 5:40 pm

AMCQ46 wrote:
lloydiecbr wrote:Just got back from dyno .
Standard stacks 103.36 bhp
Billet long hrc copy stacks 105.77bhp

Lloydie, looks like you didnt go for a run to Wales then!

As you beat me to it, you need to answer the questions I wanted answered on the dyno:

what was the Midrange like?
what did the fuel / air look like with the HRC bits.......does it need rejetted?

dyno prints will be posted later

AMCQ46 · Post by **AMCQ46** » Fri Apr 13, 2012 5:47 pm

NOW

did I mention that I was impatient?

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