Ridemalibu Motorcycle Rentals & Tours – Los Angeles CA
  1. Ciao Guest - You’ve landed at the ultimate Guzzi site. In SoCal? See the SERVICE tab above for the best in service, tires, tuning and installation of our products or custom work. NEW FORUM REGISTRATIONS REQUIRE EMAIL ACTIVATION - CHECK YOUR SPAM FOLDER - Use the CONTACT above if we can be of help. ALWAYS TRY A SEARCH BEFORE STARTING A NEW TOPIC - Most questions you may have are already answered on the Forum with FACTS, NOT OPINIONS. PLEASE DON'T BE A DRIVE-BY POSTER: As a common courtesy, check back if you are posting elsewhere on the web. Note there's decades of Guzzi hands-on experienced help on this site, all whom give endless amounts of their time for free; BE COURTEOUS AND RESPECTFUL! Also be sure to click on the STORE link also above for our 600+ product inventory, including many of our 100% Made-in-house-USA GTM products and engine kits. We appreciate the consideration, understanding and your business... past and future. And if you haven't seen our MotoCycle (not) art, click on the BUILDS tab above to see our work at our sister business; GT MotoCycles® -- WE ARE ONLINE ONLY - NO PHONE CALLS MADE OR RECEIVED.
  2. There is ZERO tolerance on personal attacks and ANY HYPERLINKS to a PRODUCT or other competing website(s), this includes personal pages, social media or other Forums. We work very hard to keep info relevant here. First offense is a note, second is a warning, third time will get you banned from the site. Sorry to have to do this, but we don't have the time to chase these. 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 our online STORE link above; GTM product purchases help support the site, or you can upgrade your Forum profile or DONATE via the link above.

simple filter mod idea

Discussion in 'Small Block' started by guzzisti91, Jun 17, 2018.

  1. guzzisti91

    guzzisti91 Tuned and Synch'ed

    Joined:
    Feb 2, 2018
    Messages:
    79
    Likes Received:
    11
    Location:
    Villawood
    Hey all. Winter has come, & my bike is now surging a little. It was worse, but i got out the vacuum gauges, turned the fuel down about half a turn, & halved the issue to a gentle surge. Now, when servicing the bike, i noticed the filter isn't sitting properly, & the rubber gasket from the old factory filter is now floppy while the box sits partially open. But, it wasn't surging until friday afternoon - 5 days after service. One solution to this problem is to cut enough filter foam to cover the mouth of the carburettor, then pulling the tubes over & clamping it shut - thus wedging the new filters in place.
    Is this a viable option? Should i place the foam differently? Or should i just throw away the old filter rubber & make a new gasket from filter foam?
    Of course, i can always bite the bullet & order a factory filter.....
     
  2. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

    Joined:
    Oct 28, 2008
    Messages:
    8,252
    Likes Received:
    983
    Location:
    Huntsville, AL
    Hate to tell you this but it has been my experience that the carburetor bikes seem to run best with the factory filter. I know that is contrary to what many believe, but after working on these things since 1975, that has been my observation. It eliminates time consuming re-jetting to match the different airflow.
     
  3. guzzisti91

    guzzisti91 Tuned and Synch'ed

    Joined:
    Feb 2, 2018
    Messages:
    79
    Likes Received:
    11
    Location:
    Villawood
    Yeah, but i didn't see problems with the foam until recently. In fact i saw improved fuel economy, but the change from factory occurred in summer, & from then, economy dropped. I also saw dry polyester filters online (also Aussie, i suspect) that require only blowing before being reinstalled. But with my training in cars, so does factory - but not forever. My main concern is the fiddly location of the airbox that caused me to rip the factory filter - the main reason i switched to foam in the first place. I'd be happy to change back if there's a technique around this without removing a cylinder....
     
  4. guzzisti91

    guzzisti91 Tuned and Synch'ed

    Joined:
    Feb 2, 2018
    Messages:
    79
    Likes Received:
    11
    Location:
    Villawood
    I have decided to revert to factory for the everyday - a new one is on it's way. Foam was supposed to make things easier, but it is 1. Problematic to keep in place, 2. Takes longer to prepare & 3. Good luck washing out the old filter oil - 3 soaks in napisan didn't bloody work!
    However, i will try the foam in the car, & i might retract the ducts & try clamping the foam directly to the carbs next time i take this bike to the drags.
    Would that work? Or do i need to re-jet no matter what? I just don't want this foam going to waste.
    & thanks John for the suggestion on returning to a factory filter - the Guzzi dealer made the same suggestion upon making the order. I'm not disagreeing with you, & you seem to know your stuff, but i just prefer to have a 2nd opinion where possible
     
  5. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

    Joined:
    Oct 28, 2008
    Messages:
    8,252
    Likes Received:
    983
    Location:
    Huntsville, AL
    Using the factory filter there should be no need to re-jet. If you use the foam for the drags, you will need to re-jet.
     
  6. guzzisti91

    guzzisti91 Tuned and Synch'ed

    Joined:
    Feb 2, 2018
    Messages:
    79
    Likes Received:
    11
    Location:
    Villawood
    Temperamental little buggers, aren't they... Oh well, guess i'll have to find some other way short of an engine swap to get more grunt as i can't find a set of jets
     

Share This Page