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400 exc gearing

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Ok.

Bike now goes like s**t of a proverbial shovel, thanks to sorting carb out.

But she's now a bit tall geared, 14/48 sprockets fitted, read all links and KTM talk and the general feeling seems to be 13/52.

Anybody in UK using this gearing? What do you reckon? worth swapping?

Lastly, if I've read right, the chain length will not be altered, is this correct? It'd save me buying a new chain.

Steve

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Hi steve,

Yes , 13/52 is ideal for the 400.

You may get away with the same chain but it makes it quite tight on the adjusters. I went for a new chain 1 or 2 links longer and kept the other for a spare.

Cheers Nick

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if 1 tooth off the front=3 onto the rear.

the dfference between 14-50 and 13-52 is very marginal

as chirpy just said, with extra wear over a 13 tooth sprocket is it really worth buying a new chain.

ps. bargainbiker.co.uk, chain for my cbr400 for £22.50 delivered

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A 13 tooth front will increase wear on your chain and the slides

This has not been my experience. I've run with 13/52 for more than 4,000 miles and am still on the original chain slider. If you adjust chain slack properly, you should not have a problem.

the dfference between 14-50 and 13-52 is very marginal

Again, this has not been my experience. The difference between stock (in the US) 14/50 and 13/52 was very substantial. IMHO the bike performs much better with 13/52. Super in the tight stuff, with plenty of top speed when necessary.

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I am also running 13/52 on my 02 400 EXC and have not had any problems. It really changes the characteristics of the bike; however in tight woods, it is definitely worth the change.

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Cheers Guys- (and gals if some in disguise)

13-52 installed this evening (sunday) not tried it out yet though.

What top cruising/speed do you reckon you get now with out thrashing the thing?

Steve

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if 1 tooth off the front=3 onto the rear.

the dfference between 14-50 and 13-52 is very marginal

At 13:52, the ratio is exactly 1 in the front = 4 in the back. You'd need 14:56 to equal 13:52. That's quite a difference.

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At 13:52, the ratio is exactly 1 in the front = 4 in the back. You'd need 14:56 to equal 13:52. That's quite a difference.

no you have misunderstood what I said.

14-50 is the standard gearing.

take one tooth off the front =adding three to the rear

therefore 14-50 = 13-53.

so a 13-52 is only a slight change.

if you guys recon that it is a big difference I'll give it a go for myself, afterall a pair of sprockets is only a couple of quid

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no you have misunderstood what I said.

14-50 is the standard gearing.

take one tooth off the front =adding three to the rear

therefore 14-50 = 13-53.

so a 13-52 is only a slight change.

if you guys recon that it is a big difference I'll give it a go for myself, afterall a pair of sprockets is only a couple of quid

Taking one tooth off the front does indeed = adding three (or actually 4 teeth) to the rear, therefore 13-52 = 14-56 and conversely 14-50 = 13-46.

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no you have misunderstood what I said.

14-50 is the standard gearing.

take one tooth off the front =adding three to the rear

therefore 14-50 = 13-53.

so a 13-52 is only a slight change.

14/50=3.6

13/53=4.1

14x4.1=57

So to get close to 13:53 using a 14t sprocket would take a 57t out back.

To get to 3.6 using a 13t sprocket would take a 47t sprocket.

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