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simple filter mod idea

guzzisti91

Tuned and Synch'ed
Joined
Feb 2, 2018
Messages
79
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.....
 

john zibell

Moderator
Staff member
GT di Razza Pura
Joined
Oct 28, 2008
Messages
8,683
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.
 

guzzisti91

Tuned and Synch'ed
Joined
Feb 2, 2018
Messages
79
Location
Villawood
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.
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....
 

guzzisti91

Tuned and Synch'ed
Joined
Feb 2, 2018
Messages
79
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
 

john zibell

Moderator
Staff member
GT di Razza Pura
Joined
Oct 28, 2008
Messages
8,683
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.
 

guzzisti91

Tuned and Synch'ed
Joined
Feb 2, 2018
Messages
79
Location
Villawood
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.
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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