Vacuum take-offs

Supposed to smooth the tickover but I have never noticed any difference. Main advantage is you don't drop the little rubber bungs under the starter motor.


  Keith
 
laverdakeith said:
Supposed to smooth the tickover but I have never noticed any difference. Main advantage is you don't drop the little rubber bungs under the starter motor.


  Keith
Click to expand...

Keith beat me to it. It's meant to smooth things out at tickover by "scavenging" a bit of vacuum from other ports at all times. Also meant to allow more tolerance for less than perfectly set up and balanced carbs.

Pointless these days of course, because we all run perfect condition, perfectly set up and balanced carbs...................
 
Hassle with those is that rubber hose ages, becomes brittle, pops off the carbs or splits leaving you with a very badly running motorcycle.
Paul
 
Paul Marx said:
Yes Grant, always take a spare electronic ignition, spare hydraulic clutch seals and some small diameter rubber tubing around with you.
:D
Paul
Click to expand...

I suppose you could do that or you could just have a quick look round the bike once a week/before you go out on it or maybe while you are washing it.. :D


  Keith
 
Yes Keith.
Preventive maintenance does of course make the machine more reliable as does doing away with unecessary complication.
Paul
 
Had one of those hoses split when disembarking a ferry at Santander after the overnight trip. Nightmare, Jota would not idle or run properly at all. Pulled over, luggage off ,tank off , found it and sorted within an hour but not what you need. Mate on 70s bmw  somewhat concerned as this was day one of trip back through France...didn't miss another beat though ;)
 
in that case Paul you had better take spare rear wheel bearings with you,(and a 10mm Rawlbolt) then you would have been able to change them on the way to my 40th dinner party.
CLEM
 
CLEMTOG said:
in that case Paul you had better take spare rear wheel bearings with you,(and a 10mm Rawlbolt) then you would have been able to change them on the way to my 40th dinner party.
CLEM
Click to expand...

Yes.
Still haven't looked.
Too many things cooking as usual and too many bikes.
:D
Paul
 
There is always a big interest on threads that talk about improving power on our babies. Many owners could be still satisfied with their bikes if regular proper maintenance would be applied...

My brother ran a workshop focused on Laverda in the 90's. Almost every (!) Laverda he got into the workshop suffered the same issues:

-improper setup of the carbs and/or worn out parts
    -float hight
    -synchronization of choke sliders and main sliders
    -worn out needles and needle jets
    -one or more lose screws on the actuation lever under the dome (top cover)
-ignition timing issues
    -wrong set marks
    -cables broken, insulation broken causing missfiring
-valve clearance issues

clearing this all takes about 1-2 hours on a 750 and maybe 4 - 5 hours on a triple (add another 3-4 hours if carbs need ultrasonic cleaning...). The worst triple he had in the workshop had just about 45 horse power when it came in (the reason it came in was the missing power he found on the dyno...) and had just about 76 when it left the workshop. An improvement of 70% almost...

It is really surprising how much miss-treatment these bikes take and still do run. And far more surprising is how much power you can find (or keep...) by regular maintenance...  ;)
 
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