New chain & sprocket time... but what size?

[Jayy]

Chain is near the end of it's lifespan so I'm looking to get a chain and sprocket kit.

https://www.motorbikesandparts.co.uk/did-chain-sprocket-kit-for-kawasaki-zx1000cd6fzx10r-0406-p-23089.html

Seems pretty good for £116 delivered but should I go + a few teeth?

I don't take it on the track and have no intention of doing so and there's no way I will hit top end speeds on it so I'm thinking I could do with better acceleration / wheelie power.

Do you need to go + on both front and back?

[P.addy]

Down on the front or up on the rear for wheelies.

Although.. standard gearing should be fine for wheelies

[Jayy]

Standard is perfect for wheelies but why waste having a top speed when you will never use it? Might as well put it to more use on the acceleration front.

Is that one or the other or both?

[P.addy]

Well going down on the front or up on the rear will sort it.

For a laugh, a friend got hold of a 47 tooth sprocket from his work, drilled to match the GS500 carrier and used that for stunting Stock is 39 I think

I would go up on rear personally. Smaller front may increase chain wear... although, by the sounds of what you want to do.. it may do that anyway

[Jayy]

I'm not sure what I want to do ha, I just thought it would be a good idea having a bit more acceleration. It's not really needed to be fair, it's a monster anyway.

So, putting a bigger rear sprocket on there will wear the chain even faster than normal?

Totally noob questions here but I've never done it before.

[P.addy]

I was under the impression a smaller front sprocket makes the chain "turn" tighter increasing wear. A rear increase wouldn't do much damage.

[Kickstart]

Hi

Can you already use full throttle in first gear? If not then you already have as much thrust as you can use (and while in higher gears you might gain a bit from the lower gearing, you could probably similarly gain from using a lower gear).

Lowering gearing will also mean more revs when cruising, using more fuel.

Smaller front will increase wear a bit.

All the best

Keith
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[Jayy]

Not sure to be honest Keith, it's been a while since I thrashed it in 1st gear with the rubbish weather.

[WannaBeDude]

Esp for Keith as he's had Mitos, i'm getting a rear alloy 38 fitted Wedsnesday, what perfomance will it change oiut of interest, think at present i have 41 - 43 .. ist gear at present is too short imo.


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[P.addy]

Going to up your top end a bit as long as you have the power to use that.

[WannaBeDude]

Wanted 1st gear to last more than it does .. ? and to cruise easier at 70 odd ..

Power is 25bhp est.

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[Kickstart]

Hi

Is yours a 6 speed or 7 speed one? What size is the front sprocket?

Think a Freccia used a 14 tooth front with a 41 tooth rear, which is quite similar to a 13 front with a 38 rear. That is reasonably high gearing which might not suit the unfaired bike.

38 will stretch things a out a bit but with a 14 tooth front might land up with 7th (if you have a 7th gear) being fairly useless.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[WannaBeDude]

My planet / raptor naked was ' geared ' for exceleration, afaik / just counted and looks to be 43 rear. Standard 14 front.

So going from 43 to 38 on a 6 speed gearbox.

The new rear is 38 and alloy, with LTT pure tyres one size bigger.

What this actually will do for me is : please tell me

At present i get indicated 90 mph .. with 17 stone on her.

In b4 best performance increase, lose some fucking weight fatty !.. was verging on 19 stone last summer.
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[Kickstart]

Hi

This is a thrust graph comparing the gearing between a 43 tooth (red) and a 38 tooth rear sprocket (blue). Used a Mito 6 speed power graph for it.

https://www.bikegraph.co.uk/TorqueThrustGraphMulti.php?x_max=1200&y_max=539&Id1=48&FrontSprocket1=14&RearSprocket1=43&Id2=48&FrontSprocket2=14&RearSprocket2=38&drag=yes&cd=3.94

The higher gearing would give a theoretical top speed of about 108mph, although not a hope in hell it would reach that. On your current gearing if you are managing a true 90mph then you are well past peak power and torque (although 90mph indicated is probably rather less true top speed).

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[WannaBeDude]

Thanks ...

I got upto on a straight with a flyscreen 97/8 mph ... then ditched the clocks and flyscreen and get about 85 mph tops.

I don't understand that graph, or above peak power, will 1st gear be longer and how much roughly less exceleration will there be overall.

Also the lighter tyres and sprocket should help a little, tyres are 0.9 kg less weight than standard.
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[Hairy Ben]

[WannaBeDude]

Cool, that's the opposite of what i'd like, although i hoon like mad for a few miles,i also love cruising in the summer at around 50 mph open face shorts and tshirt for max protection.
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[Kickstart]

[WannaBeDude]

Thanks for your time K, i understand it now, proof will be Wednesday afternoon, just a test really, as got sprocket for 20 quid, getting whole new high end sprocket and chain later on in the year.

Running from 43 to now 38, once tested will give me a real idea of what i want to run, be it 38 - 42 .. thanks again.
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[WannaBeDude]

Loving the difference from 43 to 38 ... better cruising mpg, usable 1st gear.

Tyres run in and main jet upto 130, plug chop WOT nearly there ..

Thanks ..
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