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Which drive sprocket?

Posted: Mon Jun 09, 2014 12:49 pm
by lammer205
What drive sprocket is best on my scoot set up TS1 ,franspeed road, li150 box, and 46 crown wheel it was on af close ratio box but lost a tooth on the cluster so needs sorted soon, so what would you recommend 16/17/18/19? Thanxs Lammer205.

Re: Which drive sprocket?

Posted: Mon Jun 09, 2014 1:08 pm
by corrado
Your best bet is downloading Tony Cassidy's gearbox visualiser, it's brilliant, it lets you compared different set-ups.

viewtopic.php?f=7&t=28888

Re: Which drive sprocket?

Posted: Mon Jun 09, 2014 1:44 pm
by lammer205
Me, being a novice it would still be a guess(lots of numbers to look at on that) but a professional opinion would be great!! ;)

Re: Which drive sprocket?

Posted: Mon Jun 09, 2014 2:51 pm
by stokky
OK, here's what I do.

Use the "Lambretta Overall Gearbox Visualiser" from Beedspeed website.
http://beedspeed.com/html-pages/Lambret ... oChart.htm

That gives you final drive ratio's for any given gearbox and sprocket combination

Then I also use a chart off CAM LAM website that gives all sprocket combinations, and correct chain length to go with it.
http://www.lambretta.co.uk/downloads/gearbox.html

Also remember if you get a pull down chain tensioner gives a bit more flexibility on chain length
Finally the larger the front sprocket the less wear on your clutch

Re: Which drive sprocket?

Posted: Mon Jun 09, 2014 3:15 pm
by stokky
ok without all the charts etc.

My TS1 (bit tuned) I had at final drive 4.81 (pacemaker and 47-18 sprockets)

Good all round drive

Re: Which drive sprocket?

Posted: Mon Jun 09, 2014 6:42 pm
by phil23fair
stokky wrote:ok without all the charts etc.

My TS1 (bit tuned) I had at final drive 4.81 (pacemaker and 47-18 sprockets)

Good all round drive
I've got the same setup and agree with Stokky

Re: Which drive sprocket?

Posted: Mon Jun 09, 2014 7:12 pm
by lammer205
Thanks lads,

As i have said above i need to use a 46 crownwheel(long story but this is my only option at this time) so it will have to be 46/?? to get me going any thoughts? thanx Lammer205

Re: Which drive sprocket?

Posted: Mon Jun 09, 2014 7:19 pm
by Muppet
exhaust?

Re: Which drive sprocket?

Posted: Mon Jun 09, 2014 7:28 pm
by lammer205
Franspeed road mate.

Re: Which drive sprocket?

Posted: Mon Jun 09, 2014 7:46 pm
by joespeed
lammer205 wrote:Thanks lads,

As i have said above i need to use a 46 crownwheel(long story but this is my only option at this time) so it will have to be 46/?? to get me going any thoughts? thanx Lammer205
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