The main reason I took it off was because space is very limited around the engine and it is a HUGE PITA to work on it. LISTENING YAMAHA?????????? I can't wait for fuel injection!
It has nothing to do with EFI.
According to the CARB executive orders, the green sticker emissions standards for off road motorcycles are 1.2 g/km for HC and 15.0 g/km for CO. For 2007, the WR 450f tested 0.7g/km for HC and 11.3 g/km for CO. Yamaha chose to submit the bike with a Pulse Air Injection System (PAIR)
In comparison, the Husqvarna TC(motocross)/TXC(enduro) 450/510 got their green sticker cert with a 0.8 g/km on the HC and a 14.3 g/km on the CO....all without the the use of a PAIR
Likewise, KTM got their 450 green sticker certified with a 0.5 g/km on the HC and 10.3 g/km on the CO without the use of a PAIR.
Its important to note that the KLX 450R and CRF 450x were both submitted for testing with a PAIR for their green sticker cert. Its also important to note that KTM and Husqvarna submitted their 50 state street legal enduroswithout a PAIR.
I have no doubt that the WR 450f (or the red and green bikes for that matter)in stock configuration without the AIS would meet the HC and CO standards for green sticker cert. Why did the Japanese MFGs submit the bikes with an AIS? IMHO (and I've said it before) it has to do with the Japanese MFGs desire to comply with emissions standards (as well as saftey standards) by huge margins instead of just squeaking by like their competition.
At first, that doesn't seem like an entirely bad thing. However there is a clause on the executive order that states.
"the vehicles shall also be subject to 13 CCR 2414 (enforcement and recall provisions)"
That subjects the owners of these bikes who have chosen to remove the hideous pieces of crap that makes up the AIS to enforcement by rangers at SVRAs whose time would better be spent giving tickets to speeding quad tards and staging area hotshots Its a bad business decision on the part of these manufacturers and its up to the consumer (us) to pressure these manufacturers to either cut the crap (equiping these bikes with AIS) or shop the competition.
There is only one solution to the left coast AIS issue...and thats to get on these MFG's cases so that they submit these bike for testing without all the extra garbage thats on them now. I'm probably going to write Yamaha and give them a piece of my mind. I encourage my fellow WR owners as well as the Honda and Kawi owners to do the same.
Here is the source for my figures