Rear sprocket for XT660R
 

Can someone tell me from which bike I can put rear sprocket with more theets(47 or 48) on XTR
Thanks

Hello gtec, sorry can you explain a bit more in details what you intend to do?

Am I right to assume you want to increase your sprocket pitch by a couple of teeth?

Standard pitch for the rear sprocket is 45 teeth and 15 for the front one, you can see the reaction in revs/power when increasing number of teeth using the attached spreadsheet.

If you need details of a good suppliers please check out B & C Express here:
http://www.bandcexpress.co.uk/cgi-bi...l?cat=SPR-ROAD

I know that standard is 45,I want to put 47 or 48 because friend told me(he also has XTR) that he tried one with 48 teeth on rear sprocket and he said that bike pulls incredible and bike is just little slower,170-160km/h

If you want better pick up like your mate did its easier and cheaper to go for a 14 tooth front. Very cheap at only �10 or so from BandC express. It does drop the top speed by a few mph but isnt anything massive. It makes the bike pick up alot easier, you can near wheelie in 2nd with out the clutch and easily in 3rd with the clutch, and it also makes the bike feels as if its more free'er revving.

But changing the sprocket sizes means its changes your speedo read out. Not by much, if you get the 14 tooth sprocket at a indicated 70mph your only doing 65mph in real life. You can buy a speed healer if you want but most dont bother

Yes I know if I put rear 47 then when speedo shows 170 it is realy 163km/h,with front 14 it is 159km/h

I ran a 15/47 sprockets on my XTX for a while. I used a Speedo healer to correct the speedo. The bike is great for the hills & around town but reved high on the freeway.

I want to change from a 15t to 14t front sprocket.

Will the chain need shortening?


or....if keep the standard front 15t, and go 48t rear, will I need a link put in the chain?

For XTR you have JT SPROCKETS 47 and 48 teeth ( JTR855-47 or JTR855-48 )

No and no.

There is enough adjustment in the chain to cope with either of those changes.

thanks Monty

A 15/48T rear won't fit a 09 XTX.

I just fitted a 15/47T rear & had to grind a bit of the swinging arm away to move the axle forward so I could adjust the chain correctly.
:Driving_6XFY3G:

Sorry mate - I didn't know the swing arm had changed on the R. I've had both set ups on my 2004 and 2006 models.

It has not change on the R you are right Dave, I fitted a 15/47T on my 04 XTX with no problems.

I just added additional info for the XTX riders who have 07 on wards X's with the new style swinging arm, 15/47 won't fit unless you grind the swinging arm or go a longer chain.

So will putting a 14 on the front cause issues then.

A 14T front sprocket will fit straight on a XTX & XTR, your speedo will over read by 6.7%.

I use a Speedo healer V4 to correct my speedo reading.

http://cgi.ebay.com.au/Speedo-Healer-V4-0-and-Harness-Speedo-Tuner-Calibrator-/120621409011?pt=AU_Motorcycle_Parts_Accessories&ha sh=item1c1598a2f3

changing sprockets
 

Hey guys... been reading this old thread about changing sprockets because I want to give my bike a bit more bottom end power and also because 1st gear seems too tall on the bush tracks. As it is now I'm just idling along in top gear at 100km/h so I don't reckon I'll miss the top speed given the places I ride.

The fix is obviously going for a 14T front or (I was thinkin') a 48T rear. The issues about which option is better is not just financial. I have a 2011 XTR (so R-style swing arm) and I will soon add shorter dogbone links to raise the bike. This means the swing arm angle will be steeper... As such, to help keep the chain off the swing arm protector (whatever the correct name for that is...) I figured it'd be better to go a bigger back sprocket sprocket rather than a smaller front one... hope I'm makin' sense! i.e. a smaller front sprocket might mean the chain will rub on the swing arm pivot given the swing arm's increased angle with the shorter links...

My questions... is this even an issue? Is there enough adjustment to fit a 48T rear without having to replace the standard chain? If anyone has done this mod, is it worth it?

Appreciate your thoughts!

I have been using a 14 front for 13000km
 

And I prefer it to the 15/45 set up. My girlfriends XT660R (from the same year same roughly km) runs 15/45 and I get on it and stall.

Yeah... I agree. I found 1st gear on the XT pretty tall after riding other offroad bikes. Spend a lot of time slipping the clutch on tighter or rougher trails - can't be good for the clutch in the longer term. Plus it's just annoying. So I'm pretty convinced that I'll change the gearing but still not sure whether to go smaller (14T) front or bigger (48T) rear.

Front sprockets are obviously cheaper but, again, my issue is that the shorter done bones increase the angle of the swing arm so to ensure that there is a straight chain drive between the front and rear cogs (i.e. no rubbing on the swingarm pivot) it might be better to go with the bigger back sprocket. That is, a bigger diameter back cog will negate some of the effect of the increased swing arm angle.

I've read the threads and still can't find a definitive answer on whether the 48T rear cog will fit on the XTR with the standard chain. Someone must have tried that?? Kev says it won't fit on the XTX with standard chain but the swing arm is different on the X.

Plus keen to hear from those who have installed shorter dog bones about whether the have issues now with chain rubbing on the swing arm pivot - especially if they have also installed a 14T front cog.

'aveagoodweekend... Dan

On simular theme, I have an XTR and find it a bit high geared for trails - so if I fit a 14t front would a std chain be ok with 47t or 48t on the back?

It's not that hard to change over to 15/45 for the summer riding - is it?

Thanks in advance I don't plan on jacking my bike up

I've got a 2008 XTR and fitted a Supersprox Stealth 48t on the rear primarily to do the Oonadatta Track and the Birdsville loop. I also changed the front to a JT sprocket but kept the 15t because running chains around smaller sprockets will give accelerated sprocket and chain wear (or so the good books say:rant2:).

Sorry I can't comment about the chain because I also fitted a new DID 520 chain at the same time and just added the extra links - the gold looks real pretty too :bling:

Given the number of fixed speed camera's and general attentiveness of the local constabulary I also fitted a speedo healer soon after :gsmile:

Generally I found the lower ratio gearing to be beneficial with better low speed tractability and certainly the performance both off-the-line and in the twisties is somewhat more exciting :occasion14:

But it does get a bit buzzy especially riding the longer on road distances from Melbourne to the Great Oz Outback. If I did it again I'd probably compromise on a 15t front / 47t rear - just my 2 cents worth.

I posed my question a couple of months ago on the merits of increasing rear sprocket size - then did nothing about it. :icon_rolleyes: I did add some shorter dog bone links (home made jobs at 84 mm centre to centre). They lifted the bike about an inch I suppose. Add that to the 35mm lift I gave the front end and my bike well suits my height (6'5") plus gives me better ground clearance. (side stand is just long enough but you have to be careful where you park...)

So... now I'm serious about changing the gearing, and going on your advice, Platty, I reckon i'll go with a 47T rear. At least I know it'll fit with the original chain. Anyone else ride with a 47T rear? Keen to hear your thoughts... Again, I'm going for a bigger rear sprocket rather than a smaller front due to the steeper angle of my swing arm now - i.e. a bigger diameter rear will cause less rubbing on the swing arm pivot.

Hopefully, this'll give me a bit of extra power to lift the front wheel more easily in 2nd... would've come in handy over that dodgy cattle grid I hit the other day. I gave it a blip to lighten the front but nothin' happened - nearly threw me over the hangers!

I used a 47T for years, good for wheelies, higher revs on the highway.

check below to work out the changes.

http://www.sprocketcalculator.com/

http://gearingcommander.com/

next step... finding a 47T cog
 

Thanks Kev, for the advice. Sprocket calculator is very handy - this is where I figured that I couldn't fit a 48T with the original chain. I read somewhere earlier that you ran a 47 T sprocket on your X. "Good for wheelies"... I'm sold.

The local Yamaha dude reckons I should replace the front sprocket and chain at the same time if I'm gonna replace the rear - but I've only done less than 3000 km on the current set and I think they're in decent shape so I can avoid replacing the front cog and chain. What do you guys reckon? He's just trying to drum up more business? (...he hasn't seen the bike)

Of course, the Yamaha mob tell me they can't get a 47T cog for my bike anywhere in Australia anyway - it's either 46 or 48 available. I spoke to the guy at ChainGang and they can do a 47T but at $139 it's a bit pricey compared to others (e.g. renthal) that I can buy in from O.S.

Does anyone know where I can pick up a 47T cog in Australia? Does anyone have experience with ChainGang cogs to know if they're worth the coin?
Thanks... Dan

Get you local bike shop to order you in a JT 47T rear sprocket the last one I bought I paid $50.00. No need to replace the chain or front sprocket at the mileage.

http://www.jtsprockets.com/catalogue/model/2520

Thanks Kev... I've contacted a number of bike shops in Oz and this is the common response I get: "The Australian importer for JT sprockets does not offer every single fitment/size that JT make. If a particular fitment/size is not popular then they will not offer it and therefore as a dealer we cannot order it I'm afraid. Unfortunately that is the case with this particular size."

46 and 48 T are available but I kinda think what's the point in going to 46, and 48 won't fit with the standard chain. Anyway, just passing on the story for other Oz riders who might have been considering the upgrade. Who'd have thought I'd be so hard to get a 47 T sprocket? :sad1:

JT used to sell them as I bought a few 47's, 14T sprockets & sent them over seas to a few forum members who could not get that size, never mind I found you one in Oz.

A 47T in Oz, Metal Gear are in Brisbane 3881 0809, I was there on Saturday & they sell to the public, ask for Janina or Danielle. Click on the arrow & select 47T 50-32042-45. they are showing stock

http://metalgear.com.au/view_sprocket_model_details.php?model_id=5602

Kev, you're a champion mate! Thanks for your leg work. I'm following it up!
Dan

I could've PMed Kev on this, but in case anyone else is following then I'll keep it on the forum. I got the 47T sprocket (thanks again Kev for the lead :occasion14:) and fitted it. The chain was tight as a drum on the closest setting so I had to file out the keyway of the swing arm to allow the axle to move further forward (about 3mm) to get the correct adjustment... Not sure whether it was particular to my bike - but there you go, a 47T won't fit straight on with a standard chain!

Anyway, it's a lung-burning 40+ degrees out today so I only took it for a quick ride. I like this gearing a lot better! Can't wait to test it more. Next item to buy - speedo healer...

I liked my 47T

I was out riding yesterday left at 530am & it was already 29C, when I got back from my 360km ride at 1030am the heat was to much for me.

http://i201.photobucket.com/albums/a...11/1212013.jpg

I run 14/45 .. 3.2 ratio.. I find it brings the revs just up
past where the worst vibration is , motor runs a lot smoother..
Our speed limit is 100kph so the motors still not overly reving
14/45 puts the revs at 100kph about where they would be at
110kph with the standard 15/45 gearing..
It also makes it a lot easyer to go slow/cross rivers etc aswell
as reduceing the amount of gear changes on tight gravel as the motor pulls
from lower revs with out the shudering it can get with the 15/45 gearing
at very low revs out of tight corners... XT motors don't like pulling from very low revs
in higher gears , DR650 motors are the same...
All up its a far better gear ratio if you are not doing high speed road sections
over 100kph "60mph"... If you want to sit on 120kph "70mph" I would
stay with the 15/45 gearing..

Does a 46 teeth rear sprocket fit on a 2007 then? 15/46..

I've heard that you need a 112 length chain if you go above 45 back..

See this table from off-the-road.de:



----44--45--46--47--48--49--50
13 108 110 110 112 112 112 114
14 108 110 110 112 112 112 114
15 110 110 112 112 112 114 116
16 110 110 112 112 114 114 116

So if you only change to 14 front you can use standard 110 length.
If you have default 15 front and change to 46 back you need
112 length.
This is how I read this table and I assume that Off the road is right?