Carb clean and service

are'nt the carbs on a Benelli Sei twin choke jobbies, so kind of "siamezed" triple twins? or six carbs looking like three,

we used to put twin choke Webbers on racing minis a long time ago, but only used one choke, with the other left balnked and idle, because in that formula twin chokes were outlawd, useing one choke of a webber was still miles beter than any single carb.
CLEM
 
Hi John - Just bought an ultrasonic cleaner -collecting it this week - if you want to supply suitable fluid - I'll clean your carbs as need practice - don't know if that's a good deal or not? - PM me if interested - Regards - Phil
 
CLEMTOG said:
are'nt the carbs on a Benelli Sei twin choke jobbies, so kind of "siamezed" triple twins? or six carbs looking like three,

we used to put twin choke Webbers on racing minis a long time ago, but only used one choke, with the other left balnked and idle, because in that formula twin chokes were outlawd, useing one choke of a webber was still miles beter than any single carb.
CLEM
Click to expand...

Hi Clem

a six cylinder Benelli 900 has three dinky little individual carbs. There is one twinned manifold for each pair of cylinders, to which a single carb is mounted. Really quite crude, actually.

"back in the day" there was a six carb aftermarket kit with six indidual manifolds you could buy and fit, if you could justify the cost :o

Paul LeClair
 
Paul LeClair said:
CLEMTOG said:
are'nt the carbs on a Benelli Sei twin choke jobbies, so kind of "siamezed" triple twins? or six carbs looking like three,

we used to put twin choke Webbers on racing minis a long time ago, but only used one choke, with the other left balnked and idle, because in that formula twin chokes were outlawd, useing one choke of a webber was still miles beter than any single carb.
CLEM
Click to expand...

Hi Clem

a six cylinder Benelli 900 has three dinky little individual carbs. There is one twinned manifold for each pair of cylinders, to which a single carb is mounted. Really quite crude, actually.

"back in the day" there was a six carb aftermarket kit with six indidual manifolds you could buy and fit, if you could justify the cost :o

Paul LeClair
Click to expand...

Ok, Ok !
" I could have bought 2 sets of Mikunis ".
Now take your anoraks off before you get all sweaty.
 
HELLO!

I cleaned them 2 months ago. I've bought a 5 liter ultrasonic cleaner on ebay from China. A special cleaner solution for aluminium, three gasket sets, three inlet mainfold rubbers, three viton orings, rubbers betwen carbs and air filter , new air filter and Carbtune gauges to balance them.

I must say, that there is a lot of work to disassemble , clean and reassemble al three of them. I spent about four hours for each. I read a lot of help on the internet, I looked at various pictures, parts lists, etc.  I have found a lot of know how on this forum too. For example, this link helped me http://www.gruntled.com/Dellorto/PumpJet.html . 

I'm very satisfied with result of this work. The bike idle's better , it accelerates better, I can close the chocke immediately after start. I don't know what is exactly the reason for this improvment, because I changed a lot of parts, but the bike behaves much better in all respects.

greeting
 
Observations:

Benellis were as Paul states, three carbs, with 3 dual intake manifolds for the bank of 6.

We should be glad we had PHF carbs, I have had a couple of bikes that used VHBs, and just try getting hard parts for those...You can get any part for a PHF, thank god....

I use Berryman's carb cleaner, which comes in a gallon can with a dipping strainer, perfect for carbs. Cleans them quite well, but this stuff will eat the rubber, so best that you completely strip the carb, which you likely will be doing anyway....

I just re-did a set of VHFs (can still get the rubber, just not the hard parts) and this set appeared not to have the steel washer and rubber o ring for the mixture screw....being conscientious, I of course added these parts, then absolutely could not get the carbs to balance and run right...on closer inspection, jammed into the threaded hole was a washer and O-ring, which when properly replaced, the carbs ran just fine....so, make sure you get all of the rubber bits out, and double check the idle and mixture screw holes to make sure you did so....otherwise you will look like a fool.....like me.......
 
did JRS and lots since,inc slide replacement.I would now go to Mikunis first off,hoping they are as good and trouble free as those selling them allege! JRS,incidentally, insist as I recall that 145 mains are right for a JOta...frankly I think they are wrong there.Ended up with Keith who found worn bits missed by others and sorted..
Nick7
 
I'm just waiting on a pair from Keith, as soon as I have them in my mitts I'm ready to roll.
 
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