Kx450SR Pipe difference

Cygrace74
Profile picture for user Cygrace74
Posts
1131
Joined
7/2/2017
Location
Westport, MA US
Cygrace74
Edited Date/Time 4/23/2022 1:18am
I have a 2021 450 with a Ti-6 pipe and an SR that has the green decal pipe which was not mentioned anywhere as being any different. After riding both my bikes back to back yesterday I noticed the SR having a deeper sound to it and noticed it seems to have no insert in it and has no threading to install one. Will removing the insert in my normal pipe make them the same or is there other internal differences? Also had noticed on my normal pipe the bolt for the insert had backed half way out. Trying to make my bikes as similar as possible

|
Moto213
Profile picture for user Moto213
Posts
70
Joined
11/22/2020
Location
Richards, MO US
Moto213 4/22/2022 8:14am
4/22/2022 8:14am
Always take the insert out for racing
1
2
Cygrace74
Profile picture for user Cygrace74
Posts
1131
Joined
7/2/2017
Location
Westport, MA US
Cygrace74 4/22/2022 11:13am
4/22/2022 11:13am
Took the insert out but after looking at it more the diameter of the opening is smaller on the SR pipe so the SR does have a unique silencer to it which wasn’t mentioned in any of the release info. Can see in the pictures the difference in amount of carbon around the opening. I imagine it’s made to match the mapping and porting?
1
Markopolo400
Profile picture for user Markopolo400
Posts
1377
Joined
7/24/2012
Location
St. Paul-ish, MN US
Markopolo400 4/22/2022 12:38pm
4/22/2022 12:38pm
I took the insert out on my 19 with Ti6 and hated it. It was CRAZY loud, and lost a bunch of bottom. I put it back in and was happy again.
5
caviar&cigarettes338 4/22/2022 2:21pm
4/22/2022 2:21pm Edited Date/Time 4/22/2022 2:22pm
Cygrace74 wrote:
I have a 2021 450 with a Ti-6 pipe and an SR that has the green decal pipe which was not mentioned anywhere as being any...
I have a 2021 450 with a Ti-6 pipe and an SR that has the green decal pipe which was not mentioned anywhere as being any different. After riding both my bikes back to back yesterday I noticed the SR having a deeper sound to it and noticed it seems to have no insert in it and has no threading to install one. Will removing the insert in my normal pipe make them the same or is there other internal differences? Also had noticed on my normal pipe the bolt for the insert had backed half way out. Trying to make my bikes as similar as possible

I think some of the sound difference and power difference is the cylinder mods they did cleaning up the cylinder on the SR edition

The Shop

See All »
watson90
Profile picture for user watson90
Posts
159
Joined
10/12/2021
Location
CA
watson90 4/22/2022 3:40pm
4/22/2022 3:40pm
Cygrace74 wrote:
Took the insert out but after looking at it more the diameter of the opening is smaller on the SR pipe so the SR does have...
Took the insert out but after looking at it more the diameter of the opening is smaller on the SR pipe so the SR does have a unique silencer to it which wasn’t mentioned in any of the release info. Can see in the pictures the difference in amount of carbon around the opening. I imagine it’s made to match the mapping and porting?
Well did it sound similar with the insert out?
Cygrace74
Profile picture for user Cygrace74
Posts
1131
Joined
7/2/2017
Location
Westport, MA US
Cygrace74 4/22/2022 3:43pm
4/22/2022 3:43pm
watson90 wrote:
Well did it sound similar with the insert out?
It sounds closer but different, not sure what the SR pipe is since it has no spark arrester but is a smaller diameter. I’ll have to ride it Sunday to really compare
watson90
Profile picture for user watson90
Posts
159
Joined
10/12/2021
Location
CA
watson90 4/22/2022 3:46pm
4/22/2022 3:46pm
I’d guess it’s the ti6 pro system on it. They don’t come with a spark arrestor and have a slightly smaller outlet
1
731chopper
Profile picture for user 731chopper
Posts
4080
Joined
1/2/2015
Location
DFW, TX US
Fantasy
442nd
731chopper 4/22/2022 5:28pm
4/22/2022 5:28pm
Looks like a Ti-6 Pro. The photo of yours is identical to my Ti-6 Pro.
2
Cygrace74
Profile picture for user Cygrace74
Posts
1131
Joined
7/2/2017
Location
Westport, MA US
Cygrace74 4/22/2022 5:48pm
4/22/2022 5:48pm
watson90 wrote:
I’d guess it’s the ti6 pro system on it. They don’t come with a spark arrestor and have a slightly smaller outlet
I’ve been thinking that, just weird they wouldn’t put pro on the label like they typically do. It’s not listed as a pro anywhere in the bike release but it looks like that’s what it is. Wouldn’t expect it to be a deeper sound and louder than the non pro but I guess so
watson90
Profile picture for user watson90
Posts
159
Joined
10/12/2021
Location
CA
watson90 4/22/2022 5:56pm
4/22/2022 5:56pm
As said above it could also be from the porting done to the head
Zycki11
Profile picture for user Zycki11
Posts
5942
Joined
4/1/2008
Location
Ankeny, IA US
Zycki11 4/22/2022 6:54pm
4/22/2022 6:54pm
Yeah what Watson said. Kawi did some cleaning on the head and ports. More than likely it’s just a combination of the Ti6 pro and the head work.
1
SLAPAHO
Profile picture for user SLAPAHO
Posts
1555
Joined
8/15/2006
Location
Newport Beach, CA US
Fantasy
638th
SLAPAHO 4/22/2022 9:42pm
4/22/2022 9:42pm Edited Date/Time 4/22/2022 9:44pm
Switch the exhaust out and see what it sounds like on the other bike.
#434
Profile picture for user #434
Posts
1917
Joined
3/23/2017
Location
DE
#434 4/23/2022 1:16am
4/23/2022 1:16am Edited Date/Time 4/23/2022 1:18am
motoxrocks wrote:
Mapping is part of it.
True. Mapping has a big effect on how the bike sounds. Burn and exhaust temperatures change the speed of sound of the exhaust gas and therefore its tone.
I played around with the mapping tool on my YZs and noticed a much deeper sound when I switched to the richer sand setting.

Post a reply to: Kx450SR Pipe difference