ktm150sx gearing??

Insider347
Profile picture for user Insider347
Posts
515
Joined
2/21/2012
Location
Raleigh, NC US
Insider347
Edited Date/Time 4/14/2015 8:54am
I got a new 14 ktm150sx and only had it out once at NCMP. I read that some mentioned changing rear sprocket from 48 tooth to a 50. Anybody try that? I haven't raced in 10 years and a vet now and not up to speed. I was having a little trouble coming out of corners and being on the pipe immediately. Thoughts? Thanks guys.
|
mehow2g
Profile picture for user mehow2g
Posts
251
Joined
2/3/2014
Location
AU
mehow2g 4/13/2015 5:17pm
4/13/2015 5:17pm
Insider347 wrote:
I got a new 14 ktm150sx and only had it out once at NCMP. I read that some mentioned changing rear sprocket from 48 tooth to...
I got a new 14 ktm150sx and only had it out once at NCMP. I read that some mentioned changing rear sprocket from 48 tooth to a 50. Anybody try that? I haven't raced in 10 years and a vet now and not up to speed. I was having a little trouble coming out of corners and being on the pipe immediately. Thoughts? Thanks guys.
I think mine is 50/51, I can check later but I really have no issues just gotto be on the pipe.
hillbilly
Profile picture for user hillbilly
Posts
9080
Joined
8/16/2006
Location
Afton, TN US
hillbilly 4/13/2015 6:45pm
4/13/2015 6:45pm
Going up 2 teeth will shorten the gears ,meaning the shift point will be sooner. And,if the axel is riding close to the front of the adjustment slot in the swingarm you probably wont be able to use that chain.

If that is the case I'd opt for going down a tooth up front,cheaper,easy,and the chain will work.

1 tooth up front is generally 3 in rear. Divide the front into rear and get your ratio, like 15/45 is a 3.0 to 1

A 14/48 is3.423 to 1. A 14/50 is. 3.571 to 1. A 13 /48 is. 3.69 to 1

I'd try rolling into the corners a little faster and making myself lay the bike over with the intention to coast as far as possible out the corner.

That is how i used to get faster, come into a corner,pull in the clutch and see how far i could roll after it.
Grizz
Profile picture for user Grizz
Posts
3110
Joined
7/2/2012
Location
Los Angeles, CA US
Grizz 4/13/2015 6:54pm
4/13/2015 6:54pm
hillbilly wrote:
Going up 2 teeth will shorten the gears ,meaning the shift point will be sooner. And,if the axel is riding close to the front of the...
Going up 2 teeth will shorten the gears ,meaning the shift point will be sooner. And,if the axel is riding close to the front of the adjustment slot in the swingarm you probably wont be able to use that chain.

If that is the case I'd opt for going down a tooth up front,cheaper,easy,and the chain will work.

1 tooth up front is generally 3 in rear. Divide the front into rear and get your ratio, like 15/45 is a 3.0 to 1

A 14/48 is3.423 to 1. A 14/50 is. 3.571 to 1. A 13 /48 is. 3.69 to 1

I'd try rolling into the corners a little faster and making myself lay the bike over with the intention to coast as far as possible out the corner.

That is how i used to get faster, come into a corner,pull in the clutch and see how far i could roll after it.
Pull the clutch in the middle of the corner?
hillbilly
Profile picture for user hillbilly
Posts
9080
Joined
8/16/2006
Location
Afton, TN US
hillbilly 4/13/2015 7:47pm
4/13/2015 7:47pm
I use the clutch to apply power so on entering the corner it is in then i turn on the throttle and start apply however much power the rear will take with clutch.

For practice charge the corner pull in the clutch and stay off the brakes,this will make you lay the bike over and carry speed if you've set a goal to coast out to a point then try to beat that.

I never rode the response of the engine on 2 or 4 str, the clutch was what i use. And,a lot of detail went into making it easy to pull.

Lengthening the arm on the engine and modifying the fulcrum inside the engine.

On some old bikes i ground levers to fit in perches that gave a better ratio for easier pull.

The Shop

See All »
Grizz
Profile picture for user Grizz
Posts
3110
Joined
7/2/2012
Location
Los Angeles, CA US
Grizz 4/13/2015 9:29pm
4/13/2015 9:29pm
I was asking because pulling in the clutch makes the bike stand up in a corner, at least on a 450.
JMX82
Profile picture for user JMX82
Posts
1391
Joined
5/9/2013
Location
Hyllykallio FI
JMX82 4/13/2015 9:35pm
4/13/2015 9:35pm
I'm running 13/50 gearing in my 2013 150SX. The stock gearing is way too tall
#991
Profile picture for user #991
Posts
1685
Joined
8/7/2013
Location
Melbourne AU
#991 4/13/2015 9:53pm
4/13/2015 9:53pm
hillbilly wrote:
Going up 2 teeth will shorten the gears ,meaning the shift point will be sooner. And,if the axel is riding close to the front of the...
Going up 2 teeth will shorten the gears ,meaning the shift point will be sooner. And,if the axel is riding close to the front of the adjustment slot in the swingarm you probably wont be able to use that chain.

If that is the case I'd opt for going down a tooth up front,cheaper,easy,and the chain will work.

1 tooth up front is generally 3 in rear. Divide the front into rear and get your ratio, like 15/45 is a 3.0 to 1

A 14/48 is3.423 to 1. A 14/50 is. 3.571 to 1. A 13 /48 is. 3.69 to 1

I'd try rolling into the corners a little faster and making myself lay the bike over with the intention to coast as far as possible out the corner.

That is how i used to get faster, come into a corner,pull in the clutch and see how far i could roll after it.
You're right, but the engine works harder with a smaller front sprocket.

I run 13/51 on my 144.
hillbilly
Profile picture for user hillbilly
Posts
9080
Joined
8/16/2006
Location
Afton, TN US
hillbilly 4/14/2015 6:48am
4/14/2015 6:48am
Grizz wrote:
I was asking because pulling in the clutch makes the bike stand up in a corner, at least on a 450.
Not the way i do it.

One thing a 4str will do is have a gyro effect when the revs are high. The cam chain,cam,and crank will add a noticeable resistance to direction change when revs are up.
Badjak
Profile picture for user Badjak
Posts
26
Joined
9/25/2014
Location
FR
Badjak 4/14/2015 8:09am
4/14/2015 8:09am
13/50 for me before exploding it
Cygnus
Profile picture for user Cygnus
Posts
14849
Joined
8/15/2006
Location
Hanover, CO US
Cygnus 4/14/2015 8:20am
4/14/2015 8:20am
#991 wrote:
You're right, but the engine works harder with a smaller front sprocket.

I run 13/51 on my 144.
The chain works harder. The engine will
Work the same weather you go smaller up front or bigger out back. 12 is about as tight as I would want to turn a chain. 13 is better.
DS20
Profile picture for user DS20
Posts
29
Joined
10/15/2012
Location
Sumner, WA US
DS20 4/14/2015 8:30am
4/14/2015 8:30am
Insider347 wrote:
I got a new 14 ktm150sx and only had it out once at NCMP. I read that some mentioned changing rear sprocket from 48 tooth to...
I got a new 14 ktm150sx and only had it out once at NCMP. I read that some mentioned changing rear sprocket from 48 tooth to a 50. Anybody try that? I haven't raced in 10 years and a vet now and not up to speed. I was having a little trouble coming out of corners and being on the pipe immediately. Thoughts? Thanks guys.
I have a 2015 150SX.
Went up to a 50 tooth. Had to buy new chain too.
You are definitely shifting more but it is way easier to keep it on the pipe.
Coming off a yz125 I expected the 150 to have a little more throttle response/ low end....but it is just the opposite.
PC pipe and shorty silencer helps some too.
I get great starts on this bike.

crf250pilot
Profile picture for user crf250pilot
Posts
2080
Joined
4/1/2008
Location
Manning, OR US
crf250pilot 4/14/2015 8:54am
4/14/2015 8:54am
JMX82 wrote:
I'm running 13/50 gearing in my 2013 150SX. The stock gearing is way too tall
13/50 here too on my 2012 150sx. Will be trying a 51 next. Still think i'm geared too tall.

Post a reply to: ktm150sx gearing??