KLX300 Exhaust sound levels-I have them.

[Uechi45]

I have taken exhaust level readings. Here they are.


1. KLX300 with stroker head pipe and Supertrapp IDS2 with 12 discs:

All measurements directly behind(unless otherwise noted)

Idle@36"=85db
1/4@36"=98db
1/4@72"=96db
1/2@72"=99db
Measurements to the sides at 90 degrees were about 1db lower

2. KLX300 with stock head pipe and muffler with baffle removed:

Idle@36"=80db
1/4@36"=92db
1/2@72"=94db
Wide open @72"=107

3. KLX300 as above but with 1" diameter turn down tip (home made)

Idle@36"=76db
1/4@36"=90db
1/2@72"=93db

All measurements taken with Radio Shack analog meter "A" weighted.

If anyone else has done similar tests please let me know.

Also, what are the limits for various events? (enduros, hare scrambles)
or just the limits that the Green Police look for. Thanks.

 

[JimmyD2]

That's good information to have... You should post this on the PlanetKLX email list... If you're not on there, I'll post it if you don't mind. A lot of guys may like to see this.

 

[KLeeneX300]

At last years Caney Creek Enduro in the Sam Houston National Forest I tested at 98db with my KLX. I had a Stroker header with the stock muffler (baffle removed). The mesurement was taken 3700 rpm with the db meter at 45 degrees and 20 inches. For comparison a friends YZ250F tested at 96db:think His bike had a stock exhuast with a WB R4 spark arrestor screen added. I don't know how that happened.

 

[Uechi45]

JimmyD2. Go ahead and post this anywhere you like. I will be out riding today and will do more testing now that I know the distance and angle.

Al

 

[DualSportr]

The mesurement was taken 3700 rpm with the db meter at 45 degrees and 20 inches.

Which is the correct way to test. 45 degrees, 20 inches, rpm at 1/2 of peak hp. No other numbers mean much, since sound increases exponentially with rpm (in other words, an XR100 and a YZF 426 are remarkably close to the same dB at idle - they are obviously quite different when tested at the correct rpm).