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Old 01-10-2013, 12:55 PM   #1
knobbyjoe OP
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Joined: Sep 2008
Location: N by NW of The Biggest Little City
Oddometer: 539
Pre-filter or not on EFI 990

To pre-filter or not on EFI 2008 990 Adventure

Yes I have search and been reading about replacing the snorkel with a pre-filter. But have not been able to figure out the consequences to the A/F mix with EFI. I want to keep the bike stock only trying to protected the engine and give the air box filter a chance.

The story: Just disassembled the bike for the first valve check at 15,000. There is too much dust and grit in the air box and a little bit inside the fuel injector side of the air filter. The filter was dirty and obviously past due to be replaced. I did notice a loss of pep while passing at speed.

The question: If I run the pre-filter will I have adverse performance or loss of gas mileage? Or is it just plug and play and won't even know I have a pre-filter installed?

Thanks Knowledgably gurus of the air/fuel mystical world
KTM 400 XCRW with Thumper Racing 450 kit and 450 cam 2007
KTM 450 XCRW with Christini AWD and Plated 2008 now has 520 Thumper Racing kit
KTM 990 Adventure 2008
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