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fmf400ex
03-06-2003, 03:28 PM
I tried to take my front sprocket off yesturday to put a 15t on. But I could not get the 14t sprocket off. Should I just pull really hard, or do I have to take the chain off? And yes I did take the two bolts out.
Doibugu2
03-06-2003, 03:48 PM
So your putting the stock size back on?

You have to loosen the chain up quite a bit. Then there is also a little thing in front of the sprocket. Its kind of like a washer. It has grooves in it, so it will only come off one way. Once you get that off, then just pull the sprocket off. I have an '02 and it took a couple of minutes to get it loose. I had to wiggle it back and forth a lot to get it to come off.
VegasEx'r
03-06-2003, 03:50 PM
There is also a little washer-type thing with teeth on the inside of it, did you remove that as well? Once you remove the 2 bolts, you have to turn that washer thing a couple of degrees either direction so that the teeth on it line up with the splines on the shaft, then you remove it.
Did you also loosen the 4 allen bolts on the back of the swing arm? You have to loosen them, then move the carrier forward to loosen the chain (I use channel locks to rotate the carrier forward). THEN you have to slowly work the sprocket & chain off of the shaft together, then you can pull the sprocket off of the chain.
fmf400ex
03-06-2003, 08:22 PM
Ok thanks for the info guys. Well thats what I am debating. I like the 14t and all, but it seems like I wind out to soon in each gear. So should I maybe keep the 14t and get a 37t rear?
JD400exrider
03-06-2003, 08:52 PM
I took my 14tooth off and am running a 15 / 39 It is a nice in between :D
fmf400ex
03-07-2003, 06:03 AM
Ok thanks I think I will order a 39t this weekend then. But will that 15/39 be good for mx and trails?
trailburner
03-07-2003, 06:13 AM
I have been running a 15-39 for about a year & love it !!!!raced my buddy with the same mods but he has stock gearing & I pull on him through the gears[he's pissed] work's great for trail riding not to low not to high......
fmf400ex
03-07-2003, 08:23 AM
Ok trailburner thanks a lot I am ordering the 39t tomorrow morning.
Razorback
03-07-2003, 08:32 AM
If you run 18" rear tires, a 15/36 combo works great for MX.
fmf400ex
03-07-2003, 09:27 AM
Well right now I am running 20", but I may be switching over to 18" sometime soon. So would a 15/36 be all right, or should I stick with a 15/39.
Razorback
03-07-2003, 09:35 AM
If you go to 18", you won't be happy with the 39, but if you have the 20" on there, I would say the 39 would probably work OK for you.
fmf400ex
03-07-2003, 12:58 PM
Ok, well maybe I will just order a 36t for when I use the 18's then a 39t for when I am runnin 20's.
Steve-o 400EX
03-07-2003, 01:06 PM
Originally posted by trailburner
I have been running a 15-39 for about a year & love it !!!!raced my buddy with the same mods but he has stock gearing & I pull on him through the gears[he's pissed] work's great for trail riding not to low not to high......

Does he gain anything on you when ur wide open?? Just wonderin cuz i'd like to play around a little with my gearing.
fmf400ex
03-08-2003, 06:17 AM
Ok now I cannot decide the 36t or the 39t, because wont the 39t slow me down a little bit. Since I will be use 20's for a little while.
trailburner
03-11-2003, 06:30 PM
Originally posted by Steve-o 400EX
Does he gain anything on you when ur wide open?? Just wonderin cuz i'd like to play around a little with my gearing.
yes he does gain a little on me when where wide open but you can't have the best of both worlds[with gearing]I just like to be faster through the gears, all depends on what ya want .....
trailburner
03-11-2003, 06:34 PM
Originally posted by fmf400ex
Ok now I cannot decide the 36t or the 39t, because wont the 39t slow me down a little bit. Since I will be use 20's for a little while.
the 39 will take away some of your top end,but you will be quicker through the gears & the 36 will give ya more top end, all depends on what you want........
remlapr
03-11-2003, 07:06 PM
Check this out. I can't take credit though - I got the link from Braff1, not sure where he got it:

http://home.earthlink.net/~gellett/400ex.htm
Steve-o 400EX
03-11-2003, 08:05 PM
Originally posted by trailburner
yes he does gain a little on me when where wide open but you can't have the best of both worlds[with gearing]I just like to be faster through the gears, all depends on what ya want .....

Yea i like accellerating quick, It sounds like a good setup. Maybe i will try it in the future.:D