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31 May 2011
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Join Date: Sep 2007
Location: XXX<-Portugal->Azores->Santa Maria (island)
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JT Sprockets help
Hey guys!
I'm looking to replace my stock sprockets with some JT sprockets on my 1990 XT600E.
Right now I'm looking into 14-47 or 15-47 combo.
Has anyone ever tried this combo?
There are no motorways/highways on my island.
Longest straight stretch is about 1.5km long 
There are just the normal small sized town roads... most are normal asphalt roads, some are rock roads (those traditional cubes that are about 10x10 cm white or "black" cubes) and some dirt roads for fun.
I'm about to go back to the island in a few weeks and I'd like to have all the parts already there when I get back there.
Anyone?
Thanks!
Vando 
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31 May 2011
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I've got 13-47 0n my '03 Xt6 at the moment, handles great,the best it ever has, quite good for off road but screams its nuts off when I get up to about 50mph. I'll keep them on for a bit but I think I'll try 14-46 next see if thats a better compromise for a mix of on/off road.
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31 May 2011
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I think I've tried every combination of 13,14,15,16,42,45 and 47 sprockets.
Go to www.gearingcommander.com choose bike, model and stuff. Its actually me that have added the 1990 ext600e (should the same from that year and up) You canchange sprocekts and see what that does to the rpms at certain rpms and so on.
So if you know youre cruise-rpm is say 4000rpm, and you wanna be able to ride 80km/h then you can mess with hte sprockets and see whats the best.
14-47 is awesome, but on some streches it wears you out to change gears all the time, you might be getting on to ow revs in 4th, where you with stock gearing just woul dhave kept it in 2nd and ringed it out a bit.
With stock chan I can go op to 47 in the rear, and still use both 13,14 and 15.
I made a nev CS sprocket cover, so that you dont need to take of the gearlever. Just a single bolt. Really helps with the time in changing the CS sprocket. It takes about 10mins, and I know just which number on the chain/adjuster to choose with whatever gearing.
My advise is to get 14-47 for the fun/gnarly stuff, and for loose sand, and then a 15 in spare. The extra CS sprocket doenst cost ya much, and its a easy/cheap way to alter the bike. 
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1 Jun 2011
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Yeah you're right!
I'd forgotten about that website.
14-47 will cut my speed too much as I usually like ride at between 90-120 which I could only make it with too high RPMs like this.
I'll get the 14 and 15 cs sprockets and try them tho!
BTW, do ya know any EU online sellers of JT sprockets? lol
Thanks Dan & Jens! 
Vando
Last edited by bacardi23; 1 Jun 2011 at 15:39.
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1 Jun 2011
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Join Date: Nov 2009
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Try this JT Sprockets: Online Catalogue they say they deliver from London to all over.....
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1 Jun 2011
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Thanks Keny!
Should've thought of that lol
Do you know their postage prices?
Didn't find any info on them selling online...
Do they have an online shop or is it just by calling them?
Vando 
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1 Jun 2011
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I buy loose sprockets from Kedo.
I buy did vx chainkits on ebay, and buy extra sprockets aswell (often different sizes)
120km/h and enduro-ish gearing doesnt mach, and really not on a 5-speed bike. Go slower on tarmac, or struggle more offroad.
I dont like to ride 120km/h on stock gearing, wouldn't like it at all with lower gearing.
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5 Jun 2011
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My bike has to perform as a complete all rounder, from muddy ruts to 500km days on a motorway. I went for 14/45, drops first gear enough to be able to crawl along off-road without being on your clutch all the time, and still cruises at 120kph at between 5000 and 5500 revs. The XT has so much torque, you don't really need very low gearing off-road, unless you need a lot of acceleration. The rear tyre doesn't bog down in difficult terrain, open the throttle in first or second gear and it the rear tyre just rips through.
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9 Jun 2011
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Hey!
Well, 14 is going to be too low for me as it's going to decrease the distance between the top part of the frame chain slider which simply won't work for me...
I'll take a few pictures so you can see what I mean...
Still I'd rather go up to 16-50 than 15-47 because of the clearance issue I mentioned above.. which gives approximately the same gear ratio 3.133(3) from the 15-47 and 3.125 from the 16-50
Same reason as the above. Clearance!
I will only be using the XT onroad and try to avoid any offroading with the XT as it just doesn't feel built for it (too heavy) plus, I've spent too much money on her mainly with new plastics and all the other mods.. 
I rather use my 2002 DT125R for offroading.. 
Anyway, have to decide on what to do SOON!
Vando
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10 Jun 2011
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Quote:
Originally Posted by -ralph-
My bike has to perform as a complete all rounder, from muddy ruts to 500km days on a motorway. I went for 14/45, drops first gear enough to be able to crawl along off-road without being on your clutch all the time, and still cruises at 120kph at between 5000 and 5500 revs. The XT has so much torque, you don't really need very low gearing off-road, unless you need a lot of acceleration. The rear tyre doesn't bog down in difficult terrain, open the throttle in first or second gear and it the rear tyre just rips through.
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Hey guys,
3 questions.....
- Are JT Sprockets hard wearing ?
- What are the standard size sprockets on the 2002 XT600E ?
- Ralph, your choice of 14/45 sounds like an all-rounder. Would this be suitable for UK to South Africa, testing all terrain types ?
And 1 idiot question to show my lack of knowledge....
1. Are all chains and sprokets compatible on similar sized bikes ? - ie: JT Sprocket for XT with DID 520 chain...etc...(how do I know if they will work together?) 
Thanks
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10 Jun 2011
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all XT600E (since 1990) have the 15-45 stock sprockets although I think some sprockets are different in design. (someone please correct me if I'm wrong)
All 520 chains fit on the XT as long as the number of chain links is 106.
520 is the "space" between each chain link...
Although 525 chains are almost the same they won't work on the XT unless you fit a 525 chain and sprockets conversion kit so don't be conned!
JT sprockets seem to be pretty good.
Haven't read any bad things about it, ever!
Also, no. Sprockets are most of the times bike-specific!
This is so, because the "sprocket axle" has a determined spline design that varies for most every bike out there...
Vando
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10 Jun 2011
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the are 2 lenght of shoulder on the back of the drive sprocket . the 4pt uses the longer one. JT sprocket are verry soft compared to OE yamaha ones . if you are after the longest lasting set up get OE sprockets and a good x ring gold chain .
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10 Jun 2011
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I used almost nothing but JT on my trip and I usually got about 30000km out of a set. So, for me they are good.
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10 Jun 2011
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Standard ratios 15/45 as stated by Vando
My ratios, yes, good for your trip.
Any brand of chain will fit any brand of sockets, so long as they are the same pitch and roller width. Read this to understand what that means Notes on Sprockets and Chains
I have to disagree with Vando, in that the difference between 520 and 525 isn't the space between the chain link (the pitch) these are both the same, it's the roller width that's different. Also, but I'm being pedantic here, you can't assume a 520 chain will fit your XT. That is the factory standard, but somebody may already have already put 525 chain and sprockets on it unbeknownst to you.
To be honest, for the cost of it, and for the length of your trip, I'd fit new chain AND sprockets before you go, so just makes sure you buy a compatible set.
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14 Jun 2011
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Here is a picture of how my bike is right now...
the chain is off the bike but you can still see why I mentioned the 16-50 sprockets...
If you look closely you'll see that my new swingarm chain slider is already starting to show some minor wear hence the hideous larger rear sprocket I mentioned would give me quite some clearance lol
If anyone is asking themselves, when I sit on the bike the chain is almost in a good horizontal position.
BTW, look at the chain adjuster at the end of the rear spindle... it's barely at the end and the chain was still "loose".. so yeah, it has stretched quite a bit.
If I pull on some links I can see them moving ("stretching out")
Some of the links are completely worn out.. they don't move at all!
Vando 
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