Final results - Sound - 01 WR426
Posted January 06, 2003 - 12:13 PM
Posted January 09, 2003 - 05:13 PM
My friend has a 2001 YZ426 that tested at 94.5 db as well with a brand new "q" and stock header. Just for info new 426 and 450 yz's were not passing with the pro-moto billet endcap and diffuser. I thought that was pretty interesting. Anyway , we also invested in a sound meter, a tuning fork for RPM and an "official" copy of the SAE spec sheet.
As someone said before knowledge is power.
Posted January 10, 2003 - 05:19 AM
Posted January 10, 2003 - 06:19 AM
Posted January 10, 2003 - 07:43 AM
Posted January 10, 2003 - 08:51 AM
Posted January 10, 2003 - 09:19 AM
98-00 ALL YZ/WR 4xx 4500RPM
01-02 WR426 4250 RPM
01-02 YZ426 4500 RPM
01-02 WR250F 6500 RPM
01-02 YZ250F 5250 RPM
IIRC the test RPM is based on one half the max horsepower RPM.
More info can be found at the Motorcycle Industry Council website
Posted January 10, 2003 - 01:08 PM
As for the sound meter it is the radio shack digital meter and we calibrated it with the rangers on the last weekend while we were up there. It is very close to the rangers. (within .01) The tachometer we got from an engine shop, it is the same as the one you mention, it was relatively cheap.
Obviously it is not the same as the rangers but, again, we are close. Make sure you know your RPM, BEFORE you get tested.
Posted January 10, 2003 - 04:14 PM
Do you know anything about this type and is it what you use. If you are using an electronic tach or whatever could you tell me what you use so I can go that route. Thanks
Go to any small engine repair shop. They can order you one from Briggs and Stratton or the like. I paid about $14 for mine.
Posted January 11, 2003 - 07:31 AM