Dellorto balancing

R

RUSS

Full member
Hi all,
There must be a better way? For many years I have been balancing the carbs on my triple using a set of vac gauges.
It requires unscrewing the blanking screws, dropping at least one into hard to recover places, screwing in hollow threaded stubs with barb machined on the top to fit the vac hose, using pliers, screw driver, then dropping at least one into the hard to reach places etc. Then when the job is done reversing the process including dropping more fittings.
I am over it.
Does anyone know where I can get 3 longer versions of the barb fitting which can be capped off and stay in place?
I imagine they could be long enough to be level with the top of the carbs.
If I had a lathe and some brass rod I could make them but I don't and I expect someone already makes them?
Thanks
Russ
 
ay Russ,  get a cheap stethoscope & just pull whatever is on the end off the hose.
and have a listen.  works good.  get the outer carbs sounding close the same as the centre carb.
it's a 'tock', 'tack', 'tuff'  kinda thing.  a tock is about right,  a tack is sucking too hard,  and a tuff is not sucking enough.

piece of piss mate,  and no calibration required.
hav fun.  

,, pull the rubbers off the air cleaner box & hold the stethoscope tube just outside the carb bellmouth. and beware if it spits back. it's farkin loud !
,, and ya can buy those extension tube thingy's to make vac hose hook up easier.  the Redax shed has got a good set of those.
 
Russ, here ya go mate, right off the shelf, hopefully available worldwide but if not there's always the internet; http://www.motionpro.com/motorcycle/partno/08-0218/. Not long like you were asking for but they're usually short like this on production bikes, you just need a long set of needle-nosed pliers for the caps and hoses. You probably should keep a few spare rubber caps too, MotionPro don't seem them to sell them but they're standard sized for Yamazukiwakis, any bike shop will have them.
I remember those bloody kamikaze screws on my old 3c, if these had been available then I would have killed for them. I did eventually manage tolerably well when I magnetized a screwdriver (just stroke it 20-30 times in the same direction with one pole of a decent bar magnet), at least I didn't drop the little buggars as much. But permanent taps are a much better idea.

Ken
 
dellorto Uk sell them for a couple of quid each - will need a bit of tubing and a t-piece so they can be left  in situ like the later triples. Regards - Phil
 
G'day Russ

For some reason Ken's Motion Pro link doesn't work for me. Try this http://www.motionpro.com/motorcycle/partno/08-0218/
Just extend them with some vacuum hose and plug them individually or join together with a tee as Phil described

Or this: Same thing but comes with the hose and end plug http://www.motionpro.com/motorcycle/partno/08-0216/

Here's the Dellorto equivalent http://www.dellorto.co.uk/merchandise/products_details.asp?PartNo=9679&CategoryID=8&PartsectionID=17

Let me know if you're going to order some. I could use a few too.

I thought about making some on the lathe, but for a few bucks each it's less hassle to buy them. Although I actually did make a couple with M6 threads because I needed them for a Guzzi and didn't want to wait for the postman.

Cam
 
 
I have those motion pro stubs on all of my bikes. Really helps on bikes that need the carbs balance frequently (i.e. bevel ducaties, Morinis). I like the dellorto bits much better because the motion pro stubs are simply flared on the end, rather than having that "bulb" which holds the rubber cover on much better. Also, better get used to the rubber covers cracking and cause air leaks. I bought some neoprene hose and made a better set, which appear much more resistent to ozone/UV cracking.

If I understand Russ correctly, he wants to use the brass but extensions that come with vacum gauge/mercury sticks to permanently install on the inlet manifolds. Would not recommend this since vibration can cause the longer tubes to shear at the threads (combination of long tube and soft metal, I suppose). Especially a problem on SFs, but have seen with Jotas also.
 
Spub,

SFs have a balancing take-off as stock equipment!  Mounted in the inlet stubs, no need for the fiddly take-off in the carbs.

piet
 
Piet: Yes, stock they came with the rather large finned nipple and the underslung tubing. My 1974 SF2 had non stock inlet stubs and both had the nipple fitting facing to the right side, making it difficult to reach the left side nipple, especially when the bike was warmed up, if you did not wish to burn your hands....
 
I have the dell'orto stubs on the 3Cl sealed off with caps I got from Eastwood, intended for blasting protection.
Been on the stubs for years and have stayed soft and flexible, making a good seal.

Gerald
 
I wanted to be able to balance my carbs without taking the tank off and so I drilled and tapped a 5mm hole on the outside of each inlet stub. After I've finished balancing I put in a blanking screw made from an alloy cap screw which I've shortened so it blends flush with the inside face of the inlet. The Davida gauges come with a variety or adapters as standard.

Atlasside003.jpg
 
Thanks for all your thoughts and ideas. I will give the stethoscope a go.
Cam, I have also ordered you a set of stubs as well as for myself so I can compare both methods.
At least I have 2 of the old ones as spares in case I drop one of the new ones into the mysterious collection point of things I drop.
Couldn't see how to order from Davida so went with Dellorto.
Cheers
Russ
 
Thanks for that Bob.
If I had a twin I would go that way too. With a triple the blanking screw on the middle carb is hard to work with.
Cheers
Russ
 
You must log in or register to reply here.
Back
Top