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Perfect gearing ratio for dual sport?

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i currently own a 2000 model 520 exc, but i think the last owner used it for off road only, and the rear sprocket is not stock.

the manual says the rear one should be 40 (i think) but the last owner must have changed it and now the rear sprocket has 52 teeth on it.

as a result of this large size it revs out really fast, eg, if your are cruising in 3rd gear and pin it, you are almost imediatly on the rev limiter, and this is really annoying.

now my question is what size should i change the rear too because i plan on getting it read registered soon but i know this gearing is not suitable for it. it has 6 gears but still i dont believe that will compensate for this gearing.

i think the front sprocket is stock 14/15 i forgot.

i need a gearing that allows for quick acceleration in the bush but also lets the engine relax on the free ways. all help is appreciated

also, will i have to remove links in the cahin and how do i do that?

these r the sizes that fit my bike

Part No

292--520-12GP GROOVED 12T Further Information

292--520-12P STANDARD 12T Further Information

292--520-13GP GROOVED 13T Further Information

292--520-13P STANDARD 13T Further Information

292--520-14GP GROOVED 14T Further Information

292--520-14P STANDARD 14T Further Information

292--520-15GP GROOVED 15T Further Information

292--520-15P STANDARD 15T Further Information

292U-520-13GP ULTRALIGHT GROOVED 13T Further Information

292U-520-14GP ULTRALIGHT GROOVED 14T Further Information

OE REAR CHAINWHEEL:

Part No

224U-520-48GPSI ULTRALIGHT, GROOVED, 48T SILVER Further Information

ALTERNATIVE REAR CHAINWHEELS:

Part No

224U-520-38GPSI ULTRALIGHT, GROOVED, 38T SILVER Further Information

224U-520-40GPSI ULTRALIGHT, GROOVED, 40T SILVER Further Information

224U-520-41GPSI ULTRALIGHT, GROOVED, 41T SILVER Further Information

224U-520-42GPSI ULTRALIGHT, GROOVED, 42T SILVER Further Information

224U-520-43GPSI ULTRALIGHT, GROOVED, 43T SILVER Further Information

224U-520-44GPOR ULTRALIGHT, GROOVED, 44T ORANGE Further Information

224U-520-44GPSI ULTRALIGHT, GROOVED, 44T SILVER Further Information

224U-520-45GPSI ULTRALIGHT, GROOVED, 45T SILVER Further Information

224U-520-46GPSI ULTRALIGHT, GROOVED, 46T SILVER Further Information

224U-520-47GPSI ULTRALIGHT, GROOVED, 47T SILVER Further Information

224U-520-48GPBK ULTRALIGHT, GROOVED, 48T BLACK Further Information

224U-520-48GPOR ULTRALIGHT, GROOVED, 48T ORANGE Further Information

224U-520-48GPSI ULTRALIGHT, GROOVED, 48T SILVER Further Information

224U-520-49GPBK ULTRALIGHT, GROOVED, 49T BLACK Further Information

224U-520-49GPOR ULTRALIGHT, GROOVED, 49T ORANGE Further Information

224U-520-49GPSI ULTRALIGHT, GROOVED, 49T SILVER Further Information

224U-520-50GPBK ULTRALIGHT, GROOVED, 50T BLACK Further Information

224U-520-50GPOR ULTRALIGHT, GROOVED, 50T ORANGE Further Information

224U-520-50GPSI ULTRALIGHT, GROOVED, 50T SILVER Further Information

224U-520-51GPBK ULTRALIGHT, GROOVED, 51T BLACK Further Information

224U-520-51GPOR ULTRALIGHT, GROOVED, 51T ORANGE Further Information

224U-520-51GPSI ULTRALIGHT, GROOVED, 51T SILVER Further Information

224U-520-52GPBK ULTRALIGHT, GROOVED, 52T BLACK Further Information

224U-520-52GPOR ULTRALIGHT, GROOVED, 52T ORANGE Further Information

224U-520-52GPSI ULTRALIGHT, GROOVED, 52T SILVER Further Information

224U-520-53GPSI ULTRALIGHT, GROOVED, 53T SILVER Further Information

224U-520-54GPSI ULTRALIGHT, GROOVED, 54T SILVER Further Information

224U-520-55GPSI ULTRALIGHT, GROOVED, 55T SILVER Further Information

224U-520-56GPSI ULTRALIGHT, GROOVED, 56T SILVER Further Information

Edited by adem188

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Stock is 14/48, atleast it should be, thats what it was on my 450EXC. I run 14/50 and can still easily cruise at 60mph with the engine not even breaking a sweat. KTM's are already geared tall, 14/40 would make 1st useless off road. Go back to stock 14/48 or 14/45 at the tallest and you'll be able to do 70mph at about 4500rpm. With 14/40 I don't think it would pull 6th gear.

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i have run gears from 15/45 to 13/50 on my exc, and from my experience 14/48 is the best compromise between offroad and on road gearing. if you were to put 14/40 gears on the bike you would lose almost all offroadability. my bike was miserable with the 15/45(stock for an 07) gears on it when trail riding, but would easily go over 110 mph on the freeway.:busted:

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how about a 40 tooth rear? i found one new for $60 (aust) will that be too small?

i have had a think about it, and i think i will ONLYbe using it for road?

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how about a 40 tooth rear? i found one new for $60 (aust) will that be too small?

i have had a think about it, and i think i will ONLYbe using it for road?

Waaaay to small. That's like SM gearing with 17inch wheels. Off road only you want 14/48 at the tallest. Most people with EXC's run 14/50, 14/52 or even 13/50 or 13/52.

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I ran 14/45 in Death Valley and would get a speed wobble at 65mph which lugged it in 6th. 6th was useless with my knobbies on with 14/45 and to think the bike sold with 15/45. I like 13/48 for dual sport. 13/50 for trial.

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You may have serious chain slider wear issues with a 40T rear.

yer would i have to shorten the chain? how do i do that?

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yer would i have to shorten the chain? how do i do that?

You'd have to shorten the chain a bit with a 40T. Just need a chainbreaker and possibly a new masterlink.

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