My choke plungers have nipples.

[78jotadave]

My 78 Dellorto equipped triple has been running rich, so I pulled the choke plungers, all 3 of them look the same, see the first photo. I have 3 other spare plungers (used) second photo that I have had for many years. My question is this, are they supposed to have rubbers worn into nipples, or should they be as flat as possible? Thanks for any answers, cheers Dave

 

[The Sock]

They should be flat.
If you have problems sourcing them in the States, try Ducati Paddy

 

[arancia]

In the interim, carefully pull the rubber inserts out and see if they're flat on their other side, if so put them back in so that the flat side is down and continue your diagnosis.
No offense to DP but I've been able to get Dellorto bits from MG Cycle quickly and reasonably priced in USA.
https://www.mgcycle.com/index.php?main_page=index&cPath=62

 

[Paddy]

You can turn them over if you are careful getting them out but if they have gone hard enough to form a nipple they are probably going to break when you try and get them out or just be too hard to seal once turned over.
any Dellorto supplier will keep them so try local first.

 

[helicopterjim]

Dellorto bits from MG Cycle quickly and reasonably priced in USA.
https://www.mgcycle.com/index.php?main_page=index&cPath=62

Dellorto bits from MG are quick and reasonable price.

Jim

 

[78jotadave]

Thanks for all the replies, I am using my older flattish ones until I order new ones. No problems sourcing Dellorto parts via the internet from here in Southern Cal, and Wolfgang always has what I need, a top man to deal with too.

 

[hooksey]

My 78 Dellorto equipped triple has been running rich, so I pulled the choke plungers, all 3 of them look the same, see the first photo. I have 3 other spare plungers (used) second photo that I have had for many years. My question is this, are they supposed to have rubbers worn into nipples, or should they be as flat as possible? Thanks for any answers, cheers Dave

Oooo, they look excitable........been doing some tweaking there Dave

 

[Paul Marx]

They start flat and then develop nipples with age.

Paul

 

[CLEMTOG]

agree with paul, they are bound to deform a little, not realy a problem, but they must close off, not something that is easy to check, since you need the suction of a running engine for testing pruposes, can't realy use a vacuum brake bleeder, nowhere to attach it to on the fuel side or throat side. Not dear from Scooter racing shops (sorry Paddy) so if in doubt, get the wallet out.
CLEM

 

[Paddy]

You might struggle to find a scooter that uses this choke piston Clem.
I did buy a small sheet of nitrile and a hollow punch but TBH its just not worth messing about for a £4.50 item.