961 air filter

Boss302

Boss302

Joined
Jul 3, 2021
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Do I have any other options than and expensive BMC 983/08 filter shipped from overseas to USA totalling well over $100? I have read the few posts I could find here but I'm not finding anything. I don't mind modifying something to fit but if there is something reasonably priced and available in the USA I would like to know that first. If not I have a plan for modifying a K&N of similar dimensions and will post my process if the time comes. Anybody know what else is available if anything? Thanks for helping.
 
Have you checked out this mod using a K&N filter?

www.accessnorton.com

Air Box Mod

At the Krazy Horse bash yesterday was Roger from Rutland, he on this forum but can’t remember his handle/ call sign / user id, & he has rather cunningly & neatly done this to his box, the molded round raised lip is apparently taken from the air inlet of the Morgan sports car,inside is a “ K & N...
www.accessnorton.com www.accessnorton.com

Ken
 
Boss302 said:
Do I have any other options than and expensive BMC 983/08 filter shipped from overseas to USA totalling well over $100? I have read the few posts I could find here but I'm not finding anything. I don't mind modifying something to fit but if there is something reasonably priced and available in the USA I would like to know that first. If not I have a plan for modifying a K&N of similar dimensions and will post my process if the time comes. Anybody know what else is available if anything? Thanks for helping.
Click to expand...
Ever thought about this :

 
lcrken said:
Have you checked out this mod using a K&N filter?

www.accessnorton.com

Air Box Mod

At the Krazy Horse bash yesterday was Roger from Rutland, he on this forum but can’t remember his handle/ call sign / user id, & he has rather cunningly & neatly done this to his box, the molded round raised lip is apparently taken from the air inlet of the Morgan sports car,inside is a “ K & N...
www.accessnorton.com www.accessnorton.com

Ken
Click to expand...
I have an idea to modify the K&N rather than the airbox. I have the 2015 961 sport and his airbox looks quite different.
 
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Boss302 said:
What about crankcase ventilation and the inevitable oil loss containment?
Click to expand...
Look closely at the secondary oil/air separator catch container under the seat. This can then be allowed to drip into the original Norton catch bottle behind the L/H footrest plate via a small diameter tube . This is not shown in the picture , but has since been done . You don't have to do this , you can just empty the clear container when it is full. The amount you see in the bottle was after 350 miles averaging 70 MPH. Your bike may generate less discharge than mine too.
 
Last edited:
lcrken said:
Have you checked out this mod using a K&N filter?

www.accessnorton.com

Air Box Mod

At the Krazy Horse bash yesterday was Roger from Rutland, he on this forum but can’t remember his handle/ call sign / user id, & he has rather cunningly & neatly done this to his box, the molded round raised lip is apparently taken from the air inlet of the Morgan sports car,inside is a “ K & N...
www.accessnorton.com www.accessnorton.com

Ken
Click to expand...
Why do people show me things like this the day after my BMC arrives.....!
 
This was Roger’s first 961 , he chopped it in for a Mk2 in 2019, this was taken a Krazy horse when we had a gathering
EB9F21E2-39B2-46FF-BA10-1592296FE898.jpeg
 
Looks like there are no other filters available other than the BMC. I await the arrival of a similar sized K&N in the next few days. I have 2 ideas that I will consider. With either idea I will need to cut the top mounting part from the filter leaving a full size air entry. 1) I could drill a hole in the bottom surface of the cylinder shaped filter and run a long small diameter bolt the full length to the top entry area then use a crossbar that the bolt would pass through to secure it in place. This would require a large rubber seal to replace the BMC filters flange. I already have tested this with a smaller K&N and it works but I need more surface area for airflow. 2) A furniture cup holder has a flange and shape to hold a filter. If I can find one that the filter will slide tightly into I can drill numerous holes in the side of the cup holder so air can pass through the filter into the airbox and it will fit like the BMC filter into the airbox hole. I would need a soft rubber seal around the entry to limit airflow into the filter and not around it. I'll update this as I proceed. The goal is an affordable filter with no modification to the motorcycle.
 
I think it's worth mentioning that the BMC is washable and reusable - if your concern is down to the value of the filter, being able to reuse it must contribute to that.
 
Gojuu said:
I think it's worth mentioning that the BMC is washable and reusable - if your concern is down to the value of the filter, being able to reuse it must contribute to that.
Click to expand...
I'd be curious to know from different 961 owners with different age bikes how their BMCs have held up over time. Who made the filters that were in the bikes from the factory? I bought mine with 1000 miles and 2-3 years old. The rubber component of the filter that was in it dried, cracked and fell apart over the last couple years. Any owners out there who can tell of their experience with BMC longevity? I cannot even find one in the USA and the filter and shipping from Italy are well over $100. I have an issue paying that kind of money for a filter. My design looks like it will cost just over $40.
 
Boss302 said:
Looks like there are no other filters available other than the BMC. I await the arrival of a similar sized K&N in the next few days. I have 2 ideas that I will consider. With either idea I will need to cut the top mounting part from the filter leaving a full size air entry. 1) I could drill a hole in the bottom surface of the cylinder shaped filter and run a long small diameter bolt the full length to the top entry area then use a crossbar that the bolt would pass through to secure it in place. This would require a large rubber seal to replace the BMC filters flange. I already have tested this with a smaller K&N and it works but I need more surface area for airflow. 2) A furniture cup holder has a flange and shape to hold a filter. If I can find one that the filter will slide tightly into I can drill numerous holes in the side of the cup holder so air can pass through the filter into the airbox and it will fit like the BMC filter into the airbox hole. I would need a soft rubber seal around the entry to limit airflow into the filter and not around it. I'll update this as I proceed. The goal is an affordable filter with no modification to the motorcycle.
Click to expand...
I have used my BMC for 2 years (while I had an airbox) and it is in good shape still. The rubber flange is still pliable and the filter element looks great. In short the BMC is a high quality air filter .
 
I have completed my affordable , available air filter project. I will show the details as soon as I have another filter to start from scratch on. It's easy and has excellent results. The filter is a $40 K&N RU1750 that at 4" tall and 3.75" diameter fits perfectly into the box. The filter mounting surface needs to be cut out with a razor knife. I found a perfect steel mesh cylinder that slips into the filter with a tight fit to keep the filter top rigid so it won't be sucked into the box. The only other step was to make a rubber seal that fits around the mesh cylinder to provide the needed airtight flange. It sits slightly higher above the box so some longer 5mm bolts were used for the plastic hold down mount piece. Total cost less than $50. Less than half of what it would cost to get BMC filter here from Italy. Stay tuned for pictures in the next several days.
 
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I found this Part# on the alternative part list
AIR FILTER
BMC FM983/08
Was this supplied OEM?
Is it the same filter for the Dommies?
 
speirmoor said:
I found this Part# on the alternative part list
AIR FILTER
BMC FM983/08
Was this supplied OEM?
Is it the same filter for the Dommies?
Click to expand...
No , I think the Domi filter is shorter . I would ask Stu. I think the porblem is you can't fit the filter in if its too long.
 
The BMC will fit all, and is actually now standard fitment on the brummy built bikes. It's a very nicely made filter and if correctly maintained, will last you a life time.
 

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