Air filters

K&N part number RU-2450

This filter may be clamped directly to the velocity stacks that originally came on the Moto Guzzi V1000 I-Convert, V1000 G5, 1000 SP, and 850 T3 models (MG# 17114450). If using pod filters, this set up is my favorite. No permanent modifications are made to original Moto Guzzi parts, the fit is good, the clamp is secure, the important velocity stack is kept, and the slightly smaller physical size of the filter allows it to fit better in the available space.

K&N part number MG-2640 (K&N no longer manufactures this air filter)

This is a single filter that is clamped directly to both velocity stacks that originally came on the Moto Guzzi V1000 I-Convert, V1000 G5, 1000 SP, and 850 T3 models (MG# 17114450). K&N lists this filter as a suitable replacement for the 1000 cc G5, SP, and I-Convert. Thanks to Paul Linn for bringing this alternative to my attention.

The ID of these MG-2640 filters is smaller than that of the RU-2450 filters. You will need to lubricate the ID of the flange to get it to slide easily onto the velocity stacks.

UNI part numbers U801 and U802

Contributed by Mike Tiberio on the old Yahoo! Loopframe_Guzzi news group (which has now moved to Groups.io).

Greg, I have been a big fan of UNI's, right up until my bike backfired while trying to start it, and they caught FIRE!!!

That said, you can fit 2 rubber flanged unis to your bike, but a system I devised ended up cheaper, and neater IMHO. I got a single sock (no rubber flange) filter of the appropriate ID and about 8 inch long I believe. I cut center out of the closed end so I ended up with a foam tube. Leaving the spring inside to prevent collapse, I routed the foam tube from one vstack to the other and attached with zip ties or hose clamps. I figure it maximized filter area, and evened out air box vacuum.

Original post:

I am thinking that a foam tube could be bent (curved) and run from one intake to the other. To do this I had to order a flange-less type (pure foam) sock (I'll open up the closed end to make a tube). Given the stepped nature of the stock Eldo v-stacks I figured that a tube that was either 1.6 inch × 6 inch or 2 inch × 8 inch could be made to work. I ordered both (#'s U801 and U802), I'll let you know how they work out...

As it turns out either worked just fine. Only problem, the foam is an ugly green...

UNI part number UP-4182 or UP-5200

Contributed by Mark Etheridge of Moto Guzzi Classics and Charlie Mullendore of Antietam Classic Cycle

These filters clamp directly to the original velocity stacks and do not require any modification whatsoever to the carburetor or the original velocity stacks.

UNI part number UP-4182AST

Contributed by Mark Etheridge of Moto Guzzi Classics with additional feedback and photos about fitment from Jim Sofchek.

These filters are angled at 15° and clamp directly to the original velocity stacks and do not require any modification whatsoever to the carburetor or the original velocity stacks.

Fitment information and photos from Jim Sofchek:

I just received this recommended UP-4182AST filter set, and they don't exactly fit as I perceived. They may not require any modification, but they also do not fit without the two leaning on each other (see photos blow). They do stress one another with or without the red over filter too. Without the red over-filter, they are a UNI PK-52 3 inch single element pod filter but with 15° angle boots and no end cap. Now this leaning against each other may be okay for air flow, but someone will have to convince me of that and the stress the filters are in makes me wonder about their longevity. It may work but it's just not the cleanest look. BTW, the right carb is higher, so I have it angled Up, and the left carb angled Down. Dellorto VHB29's.

K&N part number R-0642 (K&N no longer manufactures this air filter)

This filter must be clamped directly to the carburetor body...with the original velocity stacks for VHB carburetors (MG# 12114401) removed.

Likely adaptation from a Japanese four cylinder motorcycle

Thanks to Lee Hulteng for sending me this information via email. In Lee's own words and photos:

I wanted to show you my intake solution. It required no modifications to the velocity stacks. I picked up this pair of filter pods at a swap meet a few years ago. The rubber elbows are from Home depot, perfect fit around the velocity stack as well as the cut end fitting into the filter base. Makes a very nice modification.

These are a set of two, so My guess is possibly meant for a cb750 or other 4 cylinder Japanese bikes.