What's the trick to installing the air filter and cage into the airbox of a 1980 CR250?
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| 1980 CR250 air filter install ? https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=2012 |
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| Author: | mxquad [ Wed Sep 03, 2008 7:17 pm ] | ||
| Post subject: | 1980 CR250 air filter install ? | ||
What's the trick to installing the air filter and cage into the airbox of a 1980 CR250?
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| Author: | redrocket190 [ Thu Sep 04, 2008 12:39 pm ] |
| Post subject: | Re: 1980 CR250 air filter install ? |
Stock? |
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| Author: | mxquad [ Thu Sep 04, 2008 6:51 pm ] | ||||
| Post subject: | Re: 1980 CR250 air filter install ? | ||||
yes a stock Honda foam air filter. How do you get the cage and filter into the airbox and properly secured. Do you have to unbolt the triangle flange to install it?
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| Author: | dogger315 [ Thu Sep 04, 2008 7:29 pm ] |
| Post subject: | Re: 1980 CR250 air filter install ? |
I haven't had to deal with this yet since I am up to my armpits in my '79 resto, but both bikes have the same airbox and mounting problems. Remove the mounting flange (the gold chromate colored piece) mounted with three bolts and install the airfilter over the plastic cage and mounting flange and secure it with the metal band. Then install the assembly back in the airbox and reattach the inlet rubber. The frequent removal and reinstallation of the mounting flange is why Fox produced a one piece backing ring back in the day. The backing ring prevented the holes in the plastic airbox from being "hogged" out. You can still get the ring today as a reproduction. Another option you might want to consider; Twin Air makes a one piece filter that is designed to circumvent this mess by including the cage and inlet rubber as an integral assembly. You remove the mounting flange permanently. When you install the Twin Air filter, simply remove the airbox cover, put the Twin Air filter in the box attaching the already mounted inlet tube on the carb through the existing hole in the airbox. Put the airbox cover back on and you are done. That is what I would use if I was building a rider/racer. dogger |
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| Author: | redrocket190 [ Fri Sep 05, 2008 9:50 pm ] |
| Post subject: | Re: 1980 CR250 air filter install ? |
...to add to what dogger said: The air boot mounts permanently to the gold metal plate. You should seal the air boot junction with silicone. The black plastic cage goes in the metal plate, the filter goes over the cage and plate, and then you slip the whole assembly into the air box and wiggle the air boot onto the back of the carb. Hold the assembly in place with one hand and line up the holes in the plate with the holes in the airbox and then do the nuts up loosely with the other hand. The rubber piece on the stock filter means you can get a good seal between the plate and the filter. You may struggle to find the NOS air filter clamp. If so use several narrow (<9mm wide) hose clamps end to end to make one band long enough. The Fox plate is a real good idea. Note that the air box only comes out of the frame forwards with the engine out. I seem to remember that the air boot on the Twin Air is smaller than the hole in the front of the airbox so it wasn't clear what would stop it flopping around some. Stay away from Uni Filters. |
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