• Ciao Guest - You’ve landed at the ultimate Guzzi site. NEW FORUM REGISTRATIONS REQUIRE EMAIL ACTIVATION - CHECK YOUR SPAM FOLDER - Use the CONTACT above if you need help. New to the forum? For all new members, we require ONE post in the Introductions section at the bottom, in order to post in most of the other sections. ALWAYS TRY A SEARCH BEFORE STARTING A NEW TOPIC - Most questions you may have, have likely been already answered. DON'T BE A DRIVE-BY POSTER: As a common courtesy, check back in and reply within 24 hours, or your post will be deleted. Note there's decades of heavily experienced Guzzi professionals on this site, all whom happily give endless amounts of their VALUABLE time for free; BE COURTEOUS AND RESPECTFUL!
  • There is ZERO tolerance on personal attacks and ANY HYPERLINKS to PRODUCT(S) or other competing website(s), including personal pages, social media or other Forums. This ALSO INCLUDES ECU DIAGnostic software, questions and mapping. We work very hard to offer commercially supported products and to keep info relevant here. First offense is a note, second is a warning, third time will get you banned from the site. We don't have the time to chase repeat (and ignorant) offenders. This is NOT a social media platform; It's an ad-free, privately funded website, in small help with user donations. Be sure to see the GTM STORE link above; ALL product purchases help support the site, or you can upgrade your Forum profile or DONATE via the link above.
  • Be sure to see the GTM STORE link also above for our 700+ product inventory, including OEM parts and many of our 100% Made-in-SoCal-USA GTM products and engine kits. In SoCal? Click the SERVICE tab above for the best in service, tires, tuning and installation of our products or custom work, and don't miss our GT MotoCycles® (not) art on the BUILDS tab above. WE'RE HERE ONLINE ONLY - NO PHONE CALLS MADE OR RECEIVED - DO NOT EMAIL AND ASK QUESTIONS OR ASK TO CALL YOU.
  • Like the new V100, GuzziTech is full throttle into the future! We're now running on an all-new server and we've updated our Forum software. The visual differences are obvious, but hopefully you'll notice the super-fast speed. If you notice any glitches or have any issues, please post on the Site Support section at the bottom. If you haven't yet, please upgrade your account which is covered in the Site Support section or via the DONATE tab above, which gives you full site access including the DOWNLOADS section. We really appreciate every $ and your support to keep this site ad-free. Create an account, sign in, upgrade your account, and enjoy. See you on the road in 2024.

V85TT Air Box Lid Mod

GTM®

Administrator
Staff member
GT di Razza Pura
Joined
Jul 1, 2009
Messages
15,059
Location
Malibu
Below is what we recommend doing to the stock air box lid for those installing our GTM Fuel Kit.

Stock air box lid show below, with two small pieces of tape removed to expose the two rectangular slots in the OEM Guzzi lid.
257954C7 5CB7 4587 8637 0B4081FCB7BF

The stock lid and filter showed (our fine Southwest talcum powder) dust leakage patterns inside the lid.

0F47AA2C A6C3 4D3D B998 512938BE9915

You can remove the lid entirely over the filter as we did in the dyno thread, or poke it full of holes however you’d like. Start by removing the snorkels. We cut/extended the slots, and added two more as shown. Then a 2” hole (could be 3~4 1” holes too) in the upper portion. Next one we do will be on the top facing upwards. Shown with a superior fitting K&N Filter.

42DF1A7A 7D41 4FC3 A03F 2F9C3CB50AEE
F0D238FA C36D 4D7A 8001 B5272D242750
 
Interesting that dust apparently got past the paper filter. I have a BMW F650 (single cylinder) that drew enough vacuum to pull the paper filter part way into the air box and allow unfiltered air into the intake when it was almost new. Fortunately, I found it before riding in dust so there was no apparent damage. I cleaned the interior of the air box and installed a K&N filter. The performance difference was amazing with no other changes. The K&N has much more filter area than the OEM paper and a better sealing surface so there has been no sign of dust getting past the filter since it was installed.

After my experience with the BMW and seeing Todd's photos, I am probably going to get a K&N for the V85TT soon. I am guessing I can run the K&N with everything else stock as long as I don't cut extra openings in the air box.
 
Interesting that dust apparently got past the paper filter. I have a BMW F650 (single cylinder) that drew enough vacuum to pull the paper filter part way into the air box and allow unfiltered air into the intake when it was almost new. Fortunately, I found it before riding in dust so there was no apparent damage. I cleaned the interior of the air box and installed a K&N filter. The performance difference was amazing with no other changes. The K&N has much more filter area than the OEM paper and a better sealing surface so there has been no sign of dust getting past the filter since it was installed.
After my experience with the BMW and seeing Todd's photos, I am probably going to get a K&N for the V85TT soon. I am guessing I can run the K&N with everything else stock as long as I don't cut extra openings in the air box.
For sure, quite a shock to me. Thanks for your post and experience Gerry. Funny, there's more OEM-only folks (especially in the BMW world it seems) that think it's paper filter or die. Good to see someone else who benefited from oiled gauze filters. When I dirt-track raced as a kid, I saw (and cleaned up after) most of the filter styles. Paper was OK, but very restrictive as to flow on the dyno. Foam was worthless, even when oiled properly IME... and oiled gauze was tops, and a pre-charger sock even better for silty or heavy wet dirt.
I've been enjoying the benefits of these for decades.
I sell both the K&N and DNA filters on the online STORE tab above, and I try to be competitive pricing wise (outside of Amazon). BMC was very good as to sizing and silicone rubber fit/seal, but they've been increasingly more difficult to get, and K&N oddly cannot be easily had here in the State which they are made. So DNA is the next in line, and I really like what they did with the V7 filter I sell on the Store as well.
Fueling is a different story... like every Guzzi I've fueled over the last 20 years now, they really come alive when allowed to digest some fuel with all of the air that they are given. So up to you on running it. ;)
 
Is item 1011-4375 in your store the correct K&N for my 2021 V85TT? I have had very good service from K&N filters on many vehicles over the years so I will buy a genuine K&N for my new bike. I will consider fueling modifications if a programmer becomes available for the ECU in my Centenario, but have never needed to make changes on fuel injected vehicles. I generally had to adjust carburetors on other vehicles to compensate for the improved air flow and filtration. I learned soon after installing K&N filters in my R1150RS and F650 to not talk about K&N at BMW gatherings or on user forums. I also found foam filters to be less than ideal on the dirt bikes I rode growing up on a farm.
 
Is item 1011-4375 in your store the correct K&N for my 2021 V85TT?
That is correct...


It's noted twice in the description and shown in a model search.
You haven't lived unless you've twisted the grip on a fuel-corrected bike. All I'll add as 25+ years of doing it has exhausted me in talking about it.
 
Reminds what I used to do to air box's back when motocross bikes were air cooled. You might want to add a pre-filter call outwears; outerwears.com - they make pre-filters for K&N. Or you could do what we did back in the day and just wrap your filter in a
panty hose.
 
Poor fitting, In this video you can see where that dust comes... designed "five years old bambini ".. :eek:
-KG-

 
Last edited:
After confirming that 2021 takes the same filter as earlier years, I just placed an order for a K&N filter from the GTM store. I will be checking for distortion/leaks in the air box lid and also watch for future fueling modifications that are compatible with the 2021 engine management system.
 
I have by lid off now and dust appears to be leaking in from the two holes right above the throttle body. I quickly wiped them off and out before I took this picture but notice the dust still remaining further in. IMO whatever hoses or fittings attach on the other side of those holes are allowing dusty air to leak in on the filtered side.

 
Those four bolts secure the air box to the throttle body. I think the residue you see is from dust getting past the sealing surfaces of the air filter.
 
Thanks yes I want to add grease to where it mates and at the large O-ring in my image. Might even replace it with a slightly thicker O-ring.
 
The yellow frame shows the area where the plastic of part 2B007979 should have been thicker. The material is so thin that it even deforms. A seal to the filter can be interrupted here.

I have used a BMC filter now which seem to fit and seal better.

If you closely look a this image of the K&N filter:
it seems that there is a groove which could solve this problem with the sealing.
Could somebody investigate who has a K&N filter?
 

Attachments

  • airbox.jpg
    airbox.jpg
    68.7 KB · Views: 27
  • 20230623_155458.jpg
    20230623_155458.jpg
    87.6 KB · Views: 26
  • kn.jpg
    kn.jpg
    21 KB · Views: 24
Last edited:
I serviced my air cleaner and I found a potential problem with the air cleaner, the 5 screw clamp that holds the air cleaner to the removable housing needs reworking, the screw holes are too tight! (The screws should slide through these holes so the clamp pulls up tight against the filter) they don’t and there is a possibility that dust will leak between the filter where it meets the housing.
This should be checked before traveling on the dirt.
 
Back
Top