Triumphrat

What is the best way to increase low end torque on a S4 without taking the whole damn engine apart? I've heard that some people change the number of teeth on the sprockets, which I assume is the equivalent of lowering the gearing through the entire bike. What are the pitfalls? Increased chain wear? Any comments on this or other mods for increasing low end torque? Thanks.

go +3 in the rear, it won't wear on your chain, makes it pull a lot harder, gives you an extra 5-10mph on the top end, downside is it raises the rpms a little when you're cruising in 6th gear, and i know those two seem slike it's backwards, but with the stock gearing set at 155mph, the bike never reaches readline in 6th gear, so with the new sprocket, it lowers the top speed to like 145mph, but it acctually lets you hit the redline this time,

go up teeth in rear usually 3 . and in actuallity you will probably decrease chain wear because of lees pinch

I don't quite follow. You say it gives an extra 5-10mph on the top end, but it lowers the top speed by 10mph? Where can I buy a +3 sprocket for the Triumph? Thanks.

sprocket specialists

You'll get more pull, but LESS top end. That's the something that gives. Nothing is free.

You can get sprockets pretty much anywhere, try www.kneedraggers.com or your friendly neighborhood triumphman.

P

Oh yea, one more thing... your speedo will not match the road speed. Retest accuracy with a GPS.

Peet

burgessa23

why would the rear sprocket affect the speedo?
isn't it on the front wheel?

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thanks,
-Andrew

Will

The speedo on a TT600 or S4 should continue to match road speed as well as it ever did, no matter what sprocket you use since it is driven off the front hub. A Daytona 600 has the speedo driven off the transmission, so sprocket changes will change how it reads.

Putting a bigger front sprocket on the bike will extend chain life more than a bigger rear sprocket. But, you will also have to put a much bigger rear sprocket to get the same effect as just putting on a bigger rear sprocket. The rule of thumb I have heard is that one tooth bigger on the front is like three teeth smaller in the back. So, if you put a 15 tooth sprocket in the front, you would have to go from a 42 tooth rear to a 45 tooth rear to keep the same ratio. Right now, my bike has a 15 tooth front and a 47 tooth rear. Next set will be 15/49.

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Will
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Go soothingly on the grease mud, as there lurks the skid demon.

Yup, check yer facts first Peet - doh.

Will's right of course, the tt and s4 use front wheel electronic speedo sensor. I made an assumption seeing a wire coming out of a cover near the tranny - which of course is actually the strator.

BUT, if it was a tranny speed sensor, then it would have ben impacted

Peet