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 Post subject: KTM 450 EXC Sprockets
PostPosted: Sat Dec 03, 2016 11:08 pm 
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50 cc

Joined: Sat Dec 03, 2016 1:55 pm
Posts: 8
Any suggestions on the best ratio to get for general trail riding on a 2010 450 exc?


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 Post subject: Re: KTM 450 EXC Sprockets
PostPosted: Sat Dec 03, 2016 11:48 pm 
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650 cc Monster

Joined: Sun Nov 11, 2012 7:31 pm
Posts: 3512
13/51 on mine


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 Post subject: Re: KTM 450 EXC Sprockets
PostPosted: Sat Dec 03, 2016 11:52 pm 
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50 cc

Joined: Sat Dec 03, 2016 1:55 pm
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Cheers


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 Post subject: Re: KTM 450 EXC Sprockets
PostPosted: Sun Dec 04, 2016 10:53 am 
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300 cc
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Joined: Mon Apr 22, 2013 7:07 pm
Posts: 570
It's always best to get it set up what you think you want with a 13 on the front. 13/50 is probably standard. But TBH you probably wouldn't notice 1 tooth on the rear either way trailriding.
Then if you need to do a lot of road work a quick swap to a 14 front, spin the axle blocks through 180 degrees and your good to go with higher gearing, no need to readjust the chain as the axle blocks rotate to be worth 1 tooth or 1/2 a link of chain length.

+1 tooth front = -3 teeth off the rear. And -1 front = +3 rear. Approximately.

Smaller front or larger rear give snappier acceleration but at the expense of outright speed or lower revs cruising speed.

Bigger front or smaller rear gives more top speed but faster speed in 1st on tick over.

13 tooth front gives more clearance between sprocket and clutch slave cylinder. Handy if it's gonna be clogged up with mud or bog!

make sure your chain length is capable of taking the extra tooth on the front if you're going to want to use the 13/14 interchangeable front sprocket option.
Be aware that some rear sprocket combinations used for the 13/14 combo (usually 47,49,51 and 53 rears) will leave you with too little chain adjustment when using the 13f and taking a link out of the chain will then brings wheel too close to the shock mudflap when using the 14f, especially with AC10s and other MST tyres. (One full chain link = 2 sprocket teeth)

When using AC10s or MST tyres they will have the effect of raising the gearing till they wear down a bit as their overall diameter/circumference is bigger when new.

Ktms are notorious for chain slap. Don't compensate for this by over tightening it. It's caused by worn out guides. Over tighten the chain and it will break sooner or later or wear the output shaft bearing.

In an ideal world you should adjust your chain with the shock off and the swing arm straight with the output shaft, swing arm bolt and wheel axle in a dead straight line!

Use the correct DID x ring slim chain. All other chains are a mm or so wider and will wear out your split link potentially causing the chain to break.
On that point check the split link every ride. Mine get replaced as soon as the clip starts looking sharp. Reckon 3 split links are used over the life of a chain.


Sorry over complicated answer to a simple question but written for others who may benefit from the extra info.


Sent from my iPhone using Tapatalk


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 Post subject: Re: KTM 450 EXC Sprockets
PostPosted: Sun Dec 04, 2016 11:15 am 
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50 cc

Joined: Sat Dec 03, 2016 1:55 pm
Posts: 8
smokinrider wrote:
It's always best to get it set up what you think you want with a 13 on the front. 13/50 is probably standard. But TBH you probably wouldn't notice 1 tooth on the rear either way trailriding.
Then if you need to do a lot of road work a quick swap to a 14 front, spin the axle blocks through 180 degrees and your good to go with higher gearing, no need to readjust the chain as the axle blocks rotate to be worth 1 tooth or 1/2 a link of chain length.

+1 tooth front = -3 teeth off the rear. And -1 front = +3 rear. Approximately.

Smaller front or larger rear give snappier acceleration but at the expense of outright speed or lower revs cruising speed.

Bigger front or smaller rear gives more top speed but faster speed in 1st on tick over.

13 tooth front gives more clearance between sprocket and clutch slave cylinder. Handy if it's gonna be clogged up with mud or bog!

make sure your chain length is capable of taking the extra tooth on the front if you're going to want to use the 13/14 interchangeable front sprocket option.
Be aware that some rear sprocket combinations used for the 13/14 combo (usually 47,49,51 and 53 rears) will leave you with too little chain adjustment when using the 13f and taking a link out of the chain will then brings wheel too close to the shock mudflap when using the 14f, especially with AC10s and other MST tyres. (One full chain link = 2 sprocket teeth)

When using AC10s or MST tyres they will have the effect of raising the gearing till they wear down a bit as their overall diameter/circumference is bigger when new.

Ktms are notorious for chain slap. Don't compensate for this by over tightening it. It's caused by worn out guides. Over tighten the chain and it will break sooner or later or wear the output shaft bearing.

In an ideal world you should adjust your chain with the shock off and the swing arm straight with the output shaft, swing arm bolt and wheel axle in a dead straight line!

Use the correct DID x ring slim chain. All other chains are a mm or so wider and will wear out your split link potentially causing the chain to break.
On that point check the split link every ride. Mine get replaced as soon as the clip starts looking sharp. Reckon 3 split links are used over the life of a chain.


Sorry over complicated answer to a simple question but written for others who may benefit from the extra info.


Sent from my iPhone using Tapatalk


Brilliant reply, many thanks.


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 Post subject: Re: KTM 450 EXC Sprockets
PostPosted: Sun Dec 04, 2016 3:19 pm 
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125cc

Joined: Sun Apr 26, 2009 8:21 pm
Posts: 196
14 front
50 rear or is it 48, somewhere there about


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 Post subject: Re: KTM 450 EXC Sprockets
PostPosted: Sun Dec 04, 2016 5:45 pm 
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650 cc Monster

Joined: Sun Nov 11, 2012 7:31 pm
Posts: 3512
I stopped using split links,as have had a failure,and mates have too...soft links last the life of the chain and I ain't heard of one failing...you an get the rivet tool kit on eBay for £12...peace of mind,priceless..


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 Post subject: Re: KTM 450 EXC Sprockets
PostPosted: Sun Dec 04, 2016 5:53 pm 
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50 cc

Joined: Sat Dec 03, 2016 1:55 pm
Posts: 8
Joel wrote:
I stopped using split links,as have had a failure,and mates have too...soft links last the life of the chain and I ain't heard of one failing...you an get the rivet tool kit on eBay for £12...peace of mind,priceless..

Got riveting kit anyway for the road bikes, is a split link not useful for maintenence though?


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 Post subject: Re: KTM 450 EXC Sprockets
PostPosted: Sun Dec 04, 2016 6:44 pm 
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650 cc Monster

Joined: Sun Nov 11, 2012 7:31 pm
Posts: 3512
What maintenance ?...ha,ha....you can always press out the soft link and replace it if you ever need to get the chain off,I cut my bottom slider along the top seam with a hack saw last time that needed replacing,so I could slide it over the chain...think the fail safe of a rivet link overcomes any downsides...


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 Post subject: Re: KTM 450 EXC Sprockets
PostPosted: Sun Dec 04, 2016 7:36 pm 
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125cc
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Joined: Thu Apr 16, 2009 4:45 pm
Posts: 146
Location: South Yorkshire / Derbyshire
13/51 gearing on my 450 exc-f suits my riding .

I have tried 13/50 13/52 with the 50th rear the bike was too sluggish , 52 was too snappy always in between gears .

It comes down to individual preference there is no right or wrong . ;)

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