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335
Joined
7/12/2013
Location
US
Edited Date/Time
8/21/2013 12:54pm
I have a 04 CR250 and rotate 2 twin air filters between rides. I clean them thoroughly with diesel then wash them out with simple green and luke warm water after.
I've been using bel ray air filter oil (blue stuff) for years and never had a problem until this bike. I recently tried some spray on oil and am havinh the same results..ive tried oiling just the outside to doing both the outside and inside of the filter.
I have re-sealed my airbox and used flat head screws where the nubs used to be to fix the sealing problem..my airbox is essentially the same as the older 01 design, without the aluminum lip.
I notice some slight specs of dirt getting through into the airbooot. In addition to putting grease on the airfilter where it seats with the airbox, i also put grease around the airfilter edge where it mates and have even tried putting alittle bit in the boot itself to try and trap it.
am i supposed to be greasing the bolt where it goes into the filter?
I've been using bel ray air filter oil (blue stuff) for years and never had a problem until this bike. I recently tried some spray on oil and am havinh the same results..ive tried oiling just the outside to doing both the outside and inside of the filter.
I have re-sealed my airbox and used flat head screws where the nubs used to be to fix the sealing problem..my airbox is essentially the same as the older 01 design, without the aluminum lip.
I notice some slight specs of dirt getting through into the airbooot. In addition to putting grease on the airfilter where it seats with the airbox, i also put grease around the airfilter edge where it mates and have even tried putting alittle bit in the boot itself to try and trap it.
am i supposed to be greasing the bolt where it goes into the filter?
perhaps ill give it a shot.
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There's a neoprene seal where the filter meets the airbox. The result is a perfect seal, without messy grease. Add that to the super high quality 2 stage foam, and as a bonus it's made in the USA.
Grease is not needed and is a leftover habit from the 70's and whatever you do never use any of those bogus kits with the stupid neoprene "gasket". they are too damn thick and push the whole filter back and make it hard to get the bolt started. They just over complicate the whole process and are unnecessary.
The dirt specs in my airboot/reed cage are pretty small and you really need to look at them with a bright light/L.E.D light to notice them
Whoever uses Notoil obviously doesnt have much an eye for detail.
it acts as a seal, especially if the airbox design isnt that goood (like the early CRFs)
its the same thing as the MX-bonz kit except it cost me about $6 in nuts and bolts from the hardware store
If you're suggesting that the filters with the built in neoprene seal (DT-1 aka Moose) are a bad idea, I would vehemently disagree with you. Particularly on a sub standard airbox design like the CR's have. Perhaps you need to apply a bit more pressure to get the retaining bolt started (and that's an actual problem??), but there is no chance of it leaking.
Pit Row
I prefer the pre-'02 CR airbox design, with the steel ring, because it doesn't require grease. The 02-07 design definitely requires grease.
The steel ring I'm talking about is not on the inside, it's on the outside and holds the airboot to the airbox. If you eliminate the nubs and woodscrews and put through bolts so that you can really crank down on it like DocMarten did, you will simply distort the steel ring and create gaps where dirt can potentially enter. The main problem with the design is the fact that the lip of the airboot rests on the outside face of the airbox and does not come inside the airbox like common sense would dictate.
The single lip airboot design is mickey mouse. The pre-'02 CR's have a superior double lip airboot, with steel rings on the inside and outside. I also seal them with weatherstrip adhesive.
The stock 02-07 design is cheaper and lighter, but it can be problematic if you don't reseal the box and grease the filters. The aftermarket kits offer a permanent fix, but you can buy a lot of grease with that money.
Maybe YOU are the problem.
these are just specs
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