2021 KX250

nwmx
Profile picture for user nwmx
Posts
206
Joined
8/18/2010
Location
Corona, CA US
nwmx 2/12/2021 9:03am
2/12/2021 9:03am
I don’t like how the pro circuit pipe made the revs feel choked up. I took the spark arrrator out last ride and it helped a ton but took away some low end grunt.

Is the fmf more free revving and where is the most noticeable improvement? Thanks
LKHill
Profile picture for user LKHill
Posts
853
Joined
9/8/2020
Location
NY US
LKHill 2/13/2021 5:48am
2/13/2021 5:48am
nwmx wrote:
I don’t like how the pro circuit pipe made the revs feel choked up. I took the spark arrrator out last ride and it helped a...
I don’t like how the pro circuit pipe made the revs feel choked up. I took the spark arrrator out last ride and it helped a ton but took away some low end grunt.

Is the fmf more free revving and where is the most noticeable improvement? Thanks
What coupler are you running? TBH exhausts don't work correctly without mapping. I feel the white coupler is too lean to begin with so the PC system could just be making it worse.
mxryan25
Profile picture for user mxryan25
Posts
175
Joined
11/27/2018
Location
Dayton, OH US
mxryan25 2/13/2021 7:40am
2/13/2021 7:40am
I can’t comment on the FMF yet, will likely be a bit before I get to ride it. On the fence whether to have the stock ECU tuned or pull the trigger on a vortex...
nwmx
Profile picture for user nwmx
Posts
206
Joined
8/18/2010
Location
Corona, CA US
nwmx 2/13/2021 9:14am
2/13/2021 9:14am
nwmx wrote:
I don’t like how the pro circuit pipe made the revs feel choked up. I took the spark arrrator out last ride and it helped a...
I don’t like how the pro circuit pipe made the revs feel choked up. I took the spark arrrator out last ride and it helped a ton but took away some low end grunt.

Is the fmf more free revving and where is the most noticeable improvement? Thanks
LKHill wrote:
What coupler are you running? TBH exhausts don't work correctly without mapping. I feel the white coupler is too lean to begin with so the PC...
What coupler are you running? TBH exhausts don't work correctly without mapping. I feel the white coupler is too lean to begin with so the PC system could just be making it worse.
I have the vortex with twisted mapping for the pc pipe

The Shop

See All »
joefez5555
Profile picture for user joefez5555
Posts
25
Joined
6/23/2020
Location
Porter, TX US
joefez5555 2/13/2021 9:54am
2/13/2021 9:54am
nwmx wrote:
I don’t like how the pro circuit pipe made the revs feel choked up. I took the spark arrrator out last ride and it helped a...
I don’t like how the pro circuit pipe made the revs feel choked up. I took the spark arrrator out last ride and it helped a ton but took away some low end grunt.

Is the fmf more free revving and where is the most noticeable improvement? Thanks
LKHill wrote:
What coupler are you running? TBH exhausts don't work correctly without mapping. I feel the white coupler is too lean to begin with so the PC...
What coupler are you running? TBH exhausts don't work correctly without mapping. I feel the white coupler is too lean to begin with so the PC system could just be making it worse.
nwmx wrote:
I have the vortex with twisted mapping for the pc pipe
NWMX how do you like it ?

I too have the PC exhaust TI pro to be exact. With the air screen removed on the white chip and she runs really good.

I’m stuck in between getting the stock ECU tuned or spend the money on a vortex.
3
BenC711
Profile picture for user BenC711
Posts
66
Joined
4/1/2018
Location
GB
BenC711 2/13/2021 10:34am
2/13/2021 10:34am
nwmx wrote:
I don’t like how the pro circuit pipe made the revs feel choked up. I took the spark arrrator out last ride and it helped a...
I don’t like how the pro circuit pipe made the revs feel choked up. I took the spark arrrator out last ride and it helped a ton but took away some low end grunt.

Is the fmf more free revving and where is the most noticeable improvement? Thanks
I found the opposite, I thought the PC made it feel really free revving and better everywhere. I’m using the green coupler, but I do have a vortex ready to go once it gets above 0 degrees
1
paddyB745
Profile picture for user paddyB745
Posts
278
Joined
2/9/2011
Location
novato, CA US
paddyB745 2/13/2021 2:49pm
2/13/2021 2:49pm
joefez5555 wrote:
NWMX how do you like it ? I too have the PC exhaust TI pro to be exact. With the air screen removed on the white...
NWMX how do you like it ?

I too have the PC exhaust TI pro to be exact. With the air screen removed on the white chip and she runs really good.

I’m stuck in between getting the stock ECU tuned or spend the money on a vortex.
I have basically the same set up on mine, except I only have the t-6 slip on. I have one ride on my vortex from twisted and it’s a big improvement IMO. I’ve played around with a couple maps and found number 7 to be my favorite. It adds a little more power everywhere, especially mid-top. Feels a lot more free revving and just makes the bike more fun.
fourfourone
Profile picture for user fourfourone
Posts
3037
Joined
10/14/2017
Location
86oh, CT US
fourfourone 2/26/2021 6:12am
2/26/2021 6:12am
How are you guys liking the 21 so far? Still torn between this and the Honda. My dealer is going to have both bikes in stock in the next few weeks so I need to make a decision. Any one have some good hours on their kx yet?
kNewc
Profile picture for user kNewc
Posts
1148
Joined
3/17/2017
Location
IN US
Fantasy
1736th
kNewc 3/9/2021 10:24am
3/9/2021 10:24am Edited Date/Time 3/9/2021 10:29am
fourfourone wrote:
How are you guys liking the 21 so far? Still torn between this and the Honda. My dealer is going to have both bikes in stock...
How are you guys liking the 21 so far? Still torn between this and the Honda. My dealer is going to have both bikes in stock in the next few weeks so I need to make a decision. Any one have some good hours on their kx yet?
For the same price? I was in a similar boat and chose the KX due to it being cheaper and the hydraulic-clutch. I don't have very many hours on it yet. The first few rides were great though!
JohnMatrix
Profile picture for user JohnMatrix
Posts
331
Joined
1/31/2017
Location
Irvine, CA US
JohnMatrix 3/16/2021 10:04am
3/16/2021 10:04am
I've got about 12 hours on mine now, and it has been fantastic. I had my buddy at Ride JBI just revalve my forks and shock for a little more comfort and plushness. It feels phenomenal now. The forks were valved a little stiff for my liking out of the box. Spring rate on both ends is unchanged, but damn, the bike is so planted in corners. I don't get that wallowing of the front end that I previously experienced at times. It has that incredible comfort on braking and acceleration bumps that these KYB components are capable of. Tracks were a bit wet from recent rain this past weekend so developed some deep ruts and ideal conditions to feel it out. The bike absolutely rails now. I'm in love.
2
2018ktm51
Profile picture for user 2018ktm51
Posts
4
Joined
9/9/2018
Location
Utica, NY US
2018ktm51 3/16/2021 10:40am
3/16/2021 10:40am
im interested in getting a slipon for 21 kx250. stock one is too loud. fmf or PC good?
kNewc
Profile picture for user kNewc
Posts
1148
Joined
3/17/2017
Location
IN US
Fantasy
1736th
kNewc 3/16/2021 12:23pm
3/16/2021 12:23pm
JohnMatrix wrote:
I've got about 12 hours on mine now, and it has been fantastic. I had my buddy at Ride JBI just revalve my forks and shock...
I've got about 12 hours on mine now, and it has been fantastic. I had my buddy at Ride JBI just revalve my forks and shock for a little more comfort and plushness. It feels phenomenal now. The forks were valved a little stiff for my liking out of the box. Spring rate on both ends is unchanged, but damn, the bike is so planted in corners. I don't get that wallowing of the front end that I previously experienced at times. It has that incredible comfort on braking and acceleration bumps that these KYB components are capable of. Tracks were a bit wet from recent rain this past weekend so developed some deep ruts and ideal conditions to feel it out. The bike absolutely rails now. I'm in love.
How tall are you and how much do you weigh? I find the rear shock so far has been perfect but the front a bit too soft. I may have to spring up the forks though since I weigh 210 with gear on. I put in an hour this weekend at a local track and it handles great. Best tracking bike I've ridden. Very predictable.
JohnMatrix
Profile picture for user JohnMatrix
Posts
331
Joined
1/31/2017
Location
Irvine, CA US
JohnMatrix 3/16/2021 7:51pm
3/16/2021 7:51pm
kNewc wrote:
How tall are you and how much do you weigh? I find the rear shock so far has been perfect but the front a bit too...
How tall are you and how much do you weigh? I find the rear shock so far has been perfect but the front a bit too soft. I may have to spring up the forks though since I weigh 210 with gear on. I put in an hour this weekend at a local track and it handles great. Best tracking bike I've ridden. Very predictable.
I’m 6’ tall and about 185 without gear. I also had no complaints on the shock but it does have a bit more comfort now. Do you feel like the forks are riding low in the stroke, or bottoming hard?
LKHill
Profile picture for user LKHill
Posts
853
Joined
9/8/2020
Location
NY US
LKHill 3/17/2021 2:09am
3/17/2021 2:09am
I am finding the handling, power and brakes to be very good. Initially the suspension seemed good. It provides good comfort with decent hold up and bottom resistance. It tends to move move than I am comfortable with on the larger bumps and jump faces. I will be doing some re-vavle work.
1
kNewc
Profile picture for user kNewc
Posts
1148
Joined
3/17/2017
Location
IN US
Fantasy
1736th
kNewc 3/18/2021 8:50am
3/18/2021 8:50am
kNewc wrote:
How tall are you and how much do you weigh? I find the rear shock so far has been perfect but the front a bit too...
How tall are you and how much do you weigh? I find the rear shock so far has been perfect but the front a bit too soft. I may have to spring up the forks though since I weigh 210 with gear on. I put in an hour this weekend at a local track and it handles great. Best tracking bike I've ridden. Very predictable.
JohnMatrix wrote:
I’m 6’ tall and about 185 without gear. I also had no complaints on the shock but it does have a bit more comfort now. Do...
I’m 6’ tall and about 185 without gear. I also had no complaints on the shock but it does have a bit more comfort now. Do you feel like the forks are riding low in the stroke, or bottoming hard?
Riding a bit low and bottoming out on the big ones. In turns I can feel it going low in the stroke. I'm pretty slow but I like the front end to be a bit high. I've been losing weight so I might not mess with much until I plateau on my weight loss.
JohnMatrix
Profile picture for user JohnMatrix
Posts
331
Joined
1/31/2017
Location
Irvine, CA US
JohnMatrix 3/18/2021 10:10am
3/18/2021 10:10am
kNewc wrote:
Riding a bit low and bottoming out on the big ones. In turns I can feel it going low in the stroke. I'm pretty slow but...
Riding a bit low and bottoming out on the big ones. In turns I can feel it going low in the stroke. I'm pretty slow but I like the front end to be a bit high. I've been losing weight so I might not mess with much until I plateau on my weight loss.
Sure that makes sense to hold off. You could always increase fork oil volume a bit to see if that helps with bottoming resistance. Easy enough to add and remove.
kNewc
Profile picture for user kNewc
Posts
1148
Joined
3/17/2017
Location
IN US
Fantasy
1736th
kNewc 3/29/2021 7:43am
3/29/2021 7:43am
I rode a bit this last weekend. It sounds like I have a bit of rattle/shake from the silencer or rear end of my bike in certain RPMs. I can't feel it, just hear it. Sounds like a heat guard vibrating but I can't seem to figure out what caused it. I wonder if it's the rear rubber rubber connection to the sub-frame. It doesn't happen all the time, but always gets my attention.
1
Joe512
Profile picture for user Joe512
Posts
365
Joined
10/2/2016
Location
Conowingo, MD US
Joe512 3/29/2021 9:09am
3/29/2021 9:09am
LKHill wrote:
What coupler are you running? TBH exhausts don't work correctly without mapping. I feel the white coupler is too lean to begin with so the PC...
What coupler are you running? TBH exhausts don't work correctly without mapping. I feel the white coupler is too lean to begin with so the PC system could just be making it worse.
nwmx wrote:
I have the vortex with twisted mapping for the pc pipe
joefez5555 wrote:
NWMX how do you like it ? I too have the PC exhaust TI pro to be exact. With the air screen removed on the white...
NWMX how do you like it ?

I too have the PC exhaust TI pro to be exact. With the air screen removed on the white chip and she runs really good.

I’m stuck in between getting the stock ECU tuned or spend the money on a vortex.
Good thing about the vortex is it can be carried over to your next bike with a reflash with the exception of a few models.

Pit Row

See All »
Mr. Afterbar
Profile picture for user Mr. Afterbar
Posts
2259
Joined
5/13/2019
Location
Green Bay, WI US
Mr. Afterbar 3/29/2021 9:33am
3/29/2021 9:33am Edited Date/Time 3/29/2021 9:35am
2018ktm51 wrote:
im interested in getting a slipon for 21 kx250. stock one is too loud. fmf or PC good?
On the 450 at least, people tend to stay away from the FMF because they aren't rubber mounted and were cracking sub frames at the mount. FMF added a metal tab to help, but people were still cracking sub frames. The tabs kept the exhaust from falling down and being destroyed. If it's any different on the 250, someone feel free to correct me.
1
quadzrulebro 3/29/2021 4:33pm
3/29/2021 4:33pm
2018ktm51 wrote:
im interested in getting a slipon for 21 kx250. stock one is too loud. fmf or PC good?
Mr. Afterbar wrote:
On the 450 at least, people tend to stay away from the FMF because they aren't rubber mounted and were cracking sub frames at the mount...
On the 450 at least, people tend to stay away from the FMF because they aren't rubber mounted and were cracking sub frames at the mount. FMF added a metal tab to help, but people were still cracking sub frames. The tabs kept the exhaust from falling down and being destroyed. If it's any different on the 250, someone feel free to correct me.
Considering that the 250 and 450s share the same frame now, I’d check to make sure FMF has come to the rubber mounted muffler party before I bought one.
MX558
Profile picture for user MX558
Posts
1876
Joined
4/1/2008
Location
US
MX558 3/29/2021 7:04pm
3/29/2021 7:04pm
2018ktm51 wrote:
im interested in getting a slipon for 21 kx250. stock one is too loud. fmf or PC good?
Mr. Afterbar wrote:
On the 450 at least, people tend to stay away from the FMF because they aren't rubber mounted and were cracking sub frames at the mount...
On the 450 at least, people tend to stay away from the FMF because they aren't rubber mounted and were cracking sub frames at the mount. FMF added a metal tab to help, but people were still cracking sub frames. The tabs kept the exhaust from falling down and being destroyed. If it's any different on the 250, someone feel free to correct me.
quadzrulebro wrote:
Considering that the 250 and 450s share the same frame now, I’d check to make sure FMF has come to the rubber mounted muffler party before...
Considering that the 250 and 450s share the same frame now, I’d check to make sure FMF has come to the rubber mounted muffler party before I bought one.
They are really easy to convert to rubber mounted .. I did mine , took about 2 hrs . I have about 35 hrs with no problems .
TogaSet
Profile picture for user TogaSet
Posts
596
Joined
5/21/2016
Location
Chandler, AZ US
TogaSet 3/29/2021 9:14pm
3/29/2021 9:14pm
Keefer the testing guru says stock pipe puts out more HP than the pro circuit or FMF. Something to keep in mind before laying down a wad of cash for aftermarket exhaust. I’ll probably get the FMF anyway when they finally get back in stock.
1
1
quadzrulebro 3/30/2021 6:01am
3/30/2021 6:01am
Mr. Afterbar wrote:
On the 450 at least, people tend to stay away from the FMF because they aren't rubber mounted and were cracking sub frames at the mount...
On the 450 at least, people tend to stay away from the FMF because they aren't rubber mounted and were cracking sub frames at the mount. FMF added a metal tab to help, but people were still cracking sub frames. The tabs kept the exhaust from falling down and being destroyed. If it's any different on the 250, someone feel free to correct me.
quadzrulebro wrote:
Considering that the 250 and 450s share the same frame now, I’d check to make sure FMF has come to the rubber mounted muffler party before...
Considering that the 250 and 450s share the same frame now, I’d check to make sure FMF has come to the rubber mounted muffler party before I bought one.
MX558 wrote:
They are really easy to convert to rubber mounted .. I did mine , took about 2 hrs . I have about 35 hrs with no...
They are really easy to convert to rubber mounted .. I did mine , took about 2 hrs . I have about 35 hrs with no problems .
I get that it can be converted, but why doesn’t FMF fix the problem on their end? Pro Circuit did.
1
721
Profile picture for user 721
Posts
28
Joined
12/25/2018
Location
CA
721 3/30/2021 6:43am
3/30/2021 6:43am
I got a FMF full system and it is rubber mounted this year .
3
2018ktm51
Profile picture for user 2018ktm51
Posts
4
Joined
9/9/2018
Location
Utica, NY US
2018ktm51 3/30/2021 6:59am
3/30/2021 6:59am
I ended up buying fmf slip on and it’s rubber mounted
3
TogaSet
Profile picture for user TogaSet
Posts
596
Joined
5/21/2016
Location
Chandler, AZ US
TogaSet 3/31/2021 11:00pm
3/31/2021 11:00pm Edited Date/Time 3/31/2021 11:07pm
This KX is a bad ass 250F. In my opinion the only flaw is the front forks. Not because they aren’t good forks they are but kawi didn’t get them right. They need a little tweaking. Enzo fixed mine now I’d put this bike up against any 250F including the Yamaha. Handles like a dream. Its starting to win again in the pro ranks the YZ has been dominating for years.
2
1
MX558
Profile picture for user MX558
Posts
1876
Joined
4/1/2008
Location
US
MX558 4/1/2021 4:54am
4/1/2021 4:54am
I rode my kids 21 last week and now I have one lol . I'm 195 wo gear so I think these stiff ass forks might work for me . This bike is amazing. I currently have a 19 450 also , best of both worlds I guess . I don't know if I'll go with a slip on right away I haven't heard they do much
2
dancolvin633
Profile picture for user dancolvin633
Posts
665
Joined
6/28/2016
Location
Plumas Lake, CA US
dancolvin633 4/2/2021 2:18pm
4/2/2021 2:18pm
How many hours does everyone have on theirs?? And had anyone heard about clutch issues?
js451
Profile picture for user js451
Posts
579
Joined
10/23/2017
Location
AU
js451 4/2/2021 5:44pm
4/2/2021 5:44pm
dancolvin633 wrote:
How many hours does everyone have on theirs?? And had anyone heard about clutch issues?
A mate of mine has had his clutch plates brake twice. But mine has been fine 🤷🏻‍♂️

Apparently there’s too much pressure in the brake line. They ended up getting a smaller clutch line and not having the master cylinder filled up so much
1
dancolvin633
Profile picture for user dancolvin633
Posts
665
Joined
6/28/2016
Location
Plumas Lake, CA US
dancolvin633 4/2/2021 5:50pm
4/2/2021 5:50pm
dancolvin633 wrote:
How many hours does everyone have on theirs?? And had anyone heard about clutch issues?
js451 wrote:
A mate of mine has had his clutch plates brake twice. But mine has been fine 🤷🏻‍♂️ Apparently there’s too much pressure in the brake line...
A mate of mine has had his clutch plates brake twice. But mine has been fine 🤷🏻‍♂️

Apparently there’s too much pressure in the brake line. They ended up getting a smaller clutch line and not having the master cylinder filled up so much
Did the plates break and take out the crank or anything?

Post a reply to: 2021 KX250