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Polar_Bear

No Grease on Airfilter?

16 posts in this topic

Hey guys, I was reading that on some motorcycles (including the 426) it says that there is no need to use grease on the airfilter to seal it. In fact they recomend not using it. What do all of you do and/or have to say about it?

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Mine's actually a 250F, but I stopped using grease because it was just too messy. I use No-Toil filter oil and when I remove a dirty filter there is a distinct "ring" of oil collected where the filter gets compressed between the filter cage and the air boot. Doesn't appear to me that any dirt is getting into the intake because of a lack of grease.

[ July 12, 2002: Message edited by: neWRiver ]

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If you would have read your manual, you would have seen that the factory recommends it. I do it and a little grease on my hand is worth the piece of mind it provides. Just remember to wipe out the old grease when you do a filter clean.

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PJ-1 Spray on filter oil,I just give the mating surface an extra coat.I've used PJ-1 for over 7 years on several different machines.Never using any sealing grease,KEY WORD-KEEP IT CLEAN!!!!!!SEE YA :):D:D

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I just use a light coat of multipurpose grease. I was thinking of getting one of those pc racing air filter sealer thingys. What do you guys think?

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In my experience sand/dirt is much more likely to enter the boot via the center hole than the rims. I only use stock elements because they have denser foam on the rim, and I apply extra oil there. Then I put a dab of grease on the center hole, and I always find grains of sand trapped by the grease there.

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Geez, you guys are a rough bunch! I have read the manual that says you should grease your filter; AND I have read magazines that say you don't need to grease your filter. There is really no clear cut way to do it, everyone is right! I know a lot of guys who don't agree with the manual! So why bag on a guy for a question. Who cares if he can't wait 6 minutes!!!???

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Originally posted by yznvegas:

If you would have read your manual, you would have seen that the factory recommends it. I do it and a little grease on my hand is worth the piece of mind it provides. Just remember to wipe out the old grease when you do a filter clean.

Here's some more piece of mind for you, but it does not come from the manual. Seems the mating area between the washer on the center bolt and the filter cage is known to allow the passage of dirt. I got the zip-ty "Air Filter Cage Ring" (even though it is not mentioned in the manual).

I like piece of mind, too and I get my hands dirty all the time. :)

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Ditto the use of a PC Racing seal. I installed one on my 426 and my son's CR 125(shudder :) ) We check the filters and air boxes after every ride at the local motocros track which is red clay and usually pretty dusty. I found no silt or dust bypass in the air boots. They seem like inexpensive insurance to me and I always greased the lip of my filters up until now. I am an engineer and I truly appreciate simple and elegant solutions to potentially costly problems.

Regards,

Bill Barnard

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