I'll be changing the front sprocket later today and was wondering if anyone knows how much torque to use?

Hi,
it's 120 Nm.

Thanks!

So, I finally got to change the front sprocket. 14T down from 15.

I dunno.. Maybe I was expecting too much, but I can't say I notice all that much of a difference. My motivation for changing it was making it go slower in first and second gear, making offroad a bit easier on the clutch and such (hey rhyme!). I guess it must go a bit slower, but my initial test driving around the parking lot wasn't all that great.

It did however feel a bit friskier going from 20-100 km/h

And now a question - Where does the bike get its speed reading from? Before changing the sprocket I was going somewhere around 105-110 km/h at 4000 rpm. With the new sprocket, it's more or less exactly the same?

Gearbox output shaft, so nothing you do will change the ratio between indicated speed and rpm. You aren't doing the same real speed as before though.

__________________
I spent a lot of money on travel and racing motorcycles - the rest I just squandered.

XT660Z - Commuter, Adventurer...Racer?

www.dashmoto.net

Other bikes >> MT-03 / CG125BR-J / ER-6F
Departed >> ZXR400L3 / EC300 / DR-Z400E / DR800S / GPZ500S / GS400

5'ish hour highway haul today, and yeah... I'm NOT doing the same speeds as before
I brought a GPS along and it seems like I'm roughly 15 km/h lower than indicated on the speedo.

Since 1st and 2nd gear aren't as slow as I was hoping for, I'm kind of regretting changing the sprocket. Those 5 highway hours were tiresome. 5k+ rpm all the way. Nonstop rain didn't help, though. Hopefully the offroad trip planned for this weekend will make up for it!

I'm pretty sure you will notice the difference once you take the bike off road - you'll stay in second rather than chopping down to first more often. The down side is it will ware more quickly than the 15th. More miles on the engine will also help that ability to stay in a higher gear + any mods on the air and exhaust side - sorry not sure what mods you have already done to the engine performance.

__________________
Work hard, rock hard, eat hard, sleep hard, grow big an wear glasses if you need em.

I have no mods to the engine and it's as quick as a modded bike. lol. 14 teeth is a must for off road. If you do mainly tarmac miles I wouldn't bother. Again, if you do mainly off road, you don't need a power mod anyway, it has plenty power for that.

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Touratech big guard. Yamaha handlebar guards. Pivot Pegz. Yam main stand. Camel Toe. 30 mm risers. 14 tooth front sprocket. Big balls. Old and not wise.

It aint all about power - its also the ability of the engine to pick up at low revs.

__________________
Work hard, rock hard, eat hard, sleep hard, grow big an wear glasses if you need em.

This.

__________________
I spent a lot of money on travel and racing motorcycles - the rest I just squandered.

XT660Z - Commuter, Adventurer...Racer?

www.dashmoto.net

Other bikes >> MT-03 / CG125BR-J / ER-6F
Departed >> ZXR400L3 / EC300 / DR-Z400E / DR800S / GPZ500S / GS400