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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 14 Aug 2010
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xt 600 sprockets and chain help needed

Hello all,
I have a 1984 xt 600, I would like to replace the chain and sprockets.
Is their a guide or chart to know for example which one would be best in
low end/mid end/top end torque etc?

My 84 xt 600 now has "40" wrote on the back sprocket.
My son has 86 xt 600 he has "42" wrote on the back sprocket.

My 84, is good in low end, first gear wheelies now, can not pull it up in 2nd gear.
My sons 86 xt 600 is good in like mid end he can do wheelies in 1st and 2nd gear and his bike will beat mine in top end also.

I am not looking for top end speed, but would like to have enough torque to do 1st and 2nd gear wheelies.

any suggestions please?
thanks
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Old 14 Aug 2010
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count the number of teeth on your rear sprocket, and order one with around 3-5 teeth additional, as that will improve your torque delivery.

in the sportbike world we do this regularly. my bike can wheelie in 2nd fairly well, first is EASY if I get careless, and I'm 99%sure I've got stock gearing on mine too.

I'll admit though, these bikes arent really exceptionally fast though, I mean its like 90mph tops if I remember right.
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  #3  
Old 14 Aug 2010
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bobthebiker thanks for your reply,

what is the number "40" & "42" wrote on the back sprockets of my bike and my sons?

thanks
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Old 14 Aug 2010
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Its the number of teeth on the sprocket.

Its like bicycles. The more teeth in the back the faster the bike should rev (torque delivery)

try messing around at Gearing Commander: Motorcycle Gear Ratio Calculator for Sprockets RPM Speed Chain You can thange a fictional gearing, and see what it does to you're revs and speed.
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  #5  
Old 26 Sep 2010
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Good call Jens thanks for that link


I have a 1999 XT600 and I find the stock 15/45 (3.00 to 1) gearing is on the high side, I'm riding the bike strictly in the dirt and have changed to 14/47 (3.36 to 1) which is the highest ratio I would consider for the dirt, the 14/47 setup provides a huge improvement over stock but could be a little lower still, when it's time for replacement I'll be switching to 13/45 (3.46 to 1)

A few examples of other dirtbike gear ratios.

Stock 1983 Honda XR500R 14/48 (3.43 to 1 )
Stock 1984 Suzuki RM250E 14/50 (3.57 to 1)
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  #6  
Old 26 Sep 2010
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Don't go lower than 14! You should only increase the rear sprocket!

If you want to go to that kind of ratio.. you should go to either 14/49 or 14/48

Don't go on the cheap side because you will have alot more troubles with other parts of your bike!

firstly you will completely waste the swingarm protector/slider in very few hundred kilometers, than comes the swingarm and by the time you figure it out you'll need a swingarm protector, chain rollers etc etc etc..

But anyway, do as you wish and...Good luck!


Vando
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Old 13 Apr 2013
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Gearing Down a 1VJ Tenere

Reigniting an old thread - actually there is loads on here about it already, but here goes!

I've been running my old 1VJ Tenere on the standard 15/40 sprockets and 18" rear for a number of years. Pretty good for riding on tarmac, gravel tracks and pistes, but a tad over-geared, particularly for more challenging terrain: sometimes the engine labours in top, there is not enough engine braking, and I find myself slipping the clutch more than I would like. This year I'm planning on doing a lot more green laning and off-road, so I want to gear it down.

The useful tables at JT sprockets JT Sprockets: Catalogue show a standard 1VJ runs at 2.67:1 compared to the 3AJ at 3.00:1 - so the 3AJ seems to be lower geared as standard, though I think I read somewhere that this is something to do with altered internal ratios in the primary drive to help with gearbox wear, but I'm not sure.
Advice on this and other threads points to going down to something more like 3.36:1, for decent off road control. This would mean a 14/47 combo, both available from JT. Steering away from a 13T front as suggested above makes good sense.

My questions:

1. As it is considerably lower than standard, is 14/47 going to be too low for the road. I don't do motorways, but still want to ride at 100km/h sometimes. I guess I could have a 15T sprocket on standby to whip back on for long road trips.

2. Any idea how many chain links I need for what is an overall increase of 6 teeth (I know there is some geometry to do in there, but it's early in the morning!) I could buy just the new sprockets and lay the old chain round to work this out, but I'm sure someone has been there before!
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Old 13 Apr 2013
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Thats a very big step. Try 15-45 first, if you dont like it, add a 14.

My dj02 has 15-45 stock, and run at around 4000rpm at 100km/h. I think it "screams" when I gear it down to 14-47 and get close to 100km/h. Actually I try to stick to just over 80km/h with that gearing.

Try Gearing Commander: Motorcycle Speed, RPM, Chain & Sprockets Calculator and see which sprockes give you which speed, at which rpm....Very helpfull.

*EDIT* I just checked, 14-47 is at 5100rpm to reach 100km/h on a 1986/87 model xt600z. Theres still a couple thousand rpm's to redline, but I think the engine seems to scream a bit at that rpm.
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Old 13 Apr 2013
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Thanks Jens - useful feedback. Think I might try 15/47 to start - mainly as I have a spare new 15T front sprocket on the shelf.
The Gearing Commander looks really useful, I'll have a play later, over a ...Saturday evening will just fly by!
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