Maintenance & Technical > KX500 Original

Air Filter

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kawdude:
I was just wondering what brand of air filter everyone is using.  There's just so many on the market anymore I don't know where to start.

mikesmith:
I like the twin air,there veary good quality and last a long time.I had a Moose filter that fell apart in no time,junk.

Rick:
I have tried various filters, but have found the stock filter to work great.  As Manny and Paul can attest, some of the Nationals are pretty darn dusty, especially in Nevada.  I use PJ1 spray on filter oil, and spray on both the inside and the outside.  I then toss the filter in a plastic grocery bag and squish the filter to make sure the oil is spread throughout the filter.  I have NEVER had a motor failure caused by the filter, even in races so dusty that the bike would barely run at the end of the event.  In one really dusty Nevada race a few years ago, they must have had 20-30 riders that lost motors due to dust getting through the filter.  On all three bikes we had in the race (all with stock filters and PJ1 spray on oil), none had a problem.

For cleaning, I use a parts washer with solvent, squeeze (don't wring) the solvent out, rinse the solvent in hot soapy water, and then rinse again in clean hot water.  Squeeze dry, and put on the shelve for air drying.  I have six filters, so only clean filters every couple of months.  I have heard that using solvent will ruin the filter, but I have filters I have had around since 1999, and they are still in perfect condition.

Just my $.02...

Rick

Sharc:
I like the Twin Air cuz it's one piece and seems higher quality than stock. I use Silkolene filter oil - SUPER tacky, and clean it with paint thinner...works great. I'd like to try the No Toil cuz it's biodegradable. A friend races XR 650's in Baja and swears by No-Toil....

NastyNick:
I like the Twin Air too and I use BelRay filter oil.  With the Twin Air (at least where I am) seems to make the bike more responsive than the UNI.  To clean it I use mineral spirits.  I have 3 that I rotate.

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