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simple filter mod idea

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

  1. guzzisti91

    guzzisti91 Tuned and Synch'ed

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    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

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    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

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    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

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    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

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    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

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    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
     

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