I don't think smokeless oils will be enough to meet the new standards. This is what an article in the American Motorcyclist Dec. 02 edition said about this issue.
"EPA Action May End Two-strokes
At the same time as it is updating emissions regulations for streetbikes, the federal EPA is also adopting the first set of nationwide emissions standards that will apply to off-road vehicles.
And while road riders are likely to see relatively small effects on new machines as a result of the regulations, the off-road world could be in for a significant shift. In fact, it appears that the new regs will eliminate two-stroke trail bikes and ATVs.
In September, the EPA adopted emissions standards for new off-highway motorcycles and ATVs beginning in 2006. And while the agency didn’t impose an outright ban on two-stroke engines, it appears that will be the effect of the regulations.
It’s important to note, though, that these new rules don’t apply to all non-road motorcycles and ATVs. In fact, the regulations actually create three different categories of off-road machines.
The first category consists of bikes and ATVs sold for recreational trail use. Beginning with the 2006 model year, these bikes would be required to meet the new EPA standards, which probably rules out two-strokes.
In the second category are closed-course competition motorcycles and ATVs, mostly motocross machines. These are not required to meet the standards.
But at the prompting of the AMA and others within the motorcycle industry, the EPA also created a third category for motorcycles only—not ATVs. This new category, known as “certified-competition machines,” would include motorcycles primarily sold for non-closed-course competition—in other words, enduros, hare scrambles, desert racing, etc. These bikes would have to meet a less-restrictive emissions standards that probably would allow for clean-burning two-strokes.
In its regulations, the EPA notes that the certified-competition machine classification is designed to keep riders from using motocross bikes on trails, whether in competitive events or in recreational riding.
“The successful development and certification of clean competition models increases the choices for consumers in the marketplace,” the agency noted. “Offered the option of a certified high-performance off-highway motorcycle that can be used both for competition and recreation, consumers may not feel the need to purchase exempt competition (motocross) motorcycles.”
Under the new rules, recreational trailbikes must emit no more than 2 grams per kilometer of hydrocarbons and nitrogen oxides, and 25 grams per kilometer of carbon monoxide. The rules would be phased in for 2006, with 100 percent compliance required in 2007.
For ATVs, the standard calls for no more than 1.5 grams per kilometer of hydrocarbons and nitrogen oxides, and 35 grams of carbon monoxide. As with motorcycles, the requirements would be phased in during 2006, with 100 percent compliance required in 2007.
On the other hand, certified-competition machines would be allowed to emit up to 4 grams per kilometer of hydrocarbons and nitrogen oxides, and 35 grams per kilometer of carbon monoxide.
To qualify for this less-restrictive classification, however, a manufacturer would have to certify that all of its models, including motocross-style competition machines, would meet this standard.
Some manufacturers may choose to ignore the new category entirely in order to avoid having emissions standards imposed on their motocross bikes. But others may decide to use the new category in order to keep producing two-stroke machines that can be used on the trail.
So what do these new rules mean for you?
First, if you have a two-stroke trail bike or ATV made before 2006, you can continue to ride it. There are no EPA restrictions on its use or maintenance. Only machines made in 2006 or later are required to meet the new standards"