Quick carb question
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Member
Vespa super 150
Joined: 08 Jan 2019
Posts: 34

Thu Feb 07, 2019 9:55 pm quote
I just ordered this carburetor, the Dellorto 20 20 and spotted on the invoice that it didn't have an oil pump, so it got me wondering if this means that it doesn't support autolube? My Super 150 does have autolube and I'd like to keep it.

This is the exact one
https://www.sip-scootershop.com/EN/Products/carburettor+dellorto+by+sip+_40001000
Enthusiast
P200e
Joined: 13 Feb 2017
Posts: 90
Location: Eureka, Ca
Thu Feb 07, 2019 10:45 pm quote
I think you ordered the wrong carb
Member
Vespa super 150
Joined: 08 Jan 2019
Posts: 34

Fri Feb 08, 2019 5:42 am quote
Hmm, I'm wondering if the no oil pump means that the carb isn't for for stroke bikes? In the scooter foot section out did list my scooter.

If it is the wrong carb at least it wasn't too much money.

By the way the initial link was wrong, this is the actual carb. That one was a 26 26, the one I ordered was a 20 20
https://www.sip-scootershop.com/EN/Products/23917700/Carburettor+DELLORTO+SI+2020.aspx?_country=E993AB67-6807-4109-BBED-F6374EBF9F9B&gpc_origin=pla&gpc_feed_alias=us&gpc_pid=23917700&gclid=CjwKCAiAyfvhBRBsEiwAe2t_i_LyNl55dKI4FDqzxC8oSDKAnbFObU4kTSuVWPLzbW7muaPq3ipDnRoCrzwQAvD_BwE
Ossessionato
1976 Super (x 2), 1974 Primavera (x 2), 2006 Fly 150
Joined: 26 Sep 2013
Posts: 4321
Location: So Cal
Fri Feb 08, 2019 6:38 am quote
Yep, wrong carb for your particular scoot.

Late model US Supers, like yours, came with autolube standard. In other years and in other markets pre-mix was standard, with autolube as an option. You can use a non-injected carb on an autolube bike but it requires disabling the oil pump, which I wouldn’t recommend doing.

Here’s what you need at SIP:

https://www.sip-scootershop.com/en/products/carburettor+dellorto+si+2020_23917800

Or from Mercato:

http://www.scootermercato.com/Scooter-Parts/Complete-Carbs/183097

You’ll need an air filter too.
Member
Vespa super 150
Joined: 08 Jan 2019
Posts: 34

Fri Feb 08, 2019 7:53 am quote
Thanks again SoCalGuy, you're a real life saver. SIP appears to be out of the air cleaners I need. Guess I'll have to look around some more for it.

Edit: Nevermind I found the correct air filter. I cancelled the other carburator but it looks like it already shipped. Hopefully the return process won't be too much of a hassle. Thanks again guys, glad I caught it early on. Hopefully I can get this together before it gets too nice out.
Member
Vespa super 150
Joined: 08 Jan 2019
Posts: 34

Fri Feb 15, 2019 11:18 am quote
Hey all, do both carbs came in and I honestly can't tell the difference between the one with the oil pump and the one without. The only difference I can tell is that the one with the oil pump has the same hook to the throttle as my old 20 15 carb. It looks like the oil pump is kind of its own thing? Unless I'm getting this wrong that is.

Here's a photo of all of the carbs. The delorto with the oil pump is on the far left, my old carb is in the middle, and the carb without the pump is on the far right. Anyone care to school me on what the difference is?
Hooked
Vespa P200, Primavera 130, VNA200, Italjet Pack-a-Way Moped, Ciao etc
Joined: 24 Oct 2014
Posts: 307
Location: Humboldt County, California
Fri Feb 15, 2019 11:45 am quote
The carb is FOR a carb box with oil pump. It will have a different pull for the slide (on the left in your photo) and a hole in the base near the venturi for the autolube pump and channel to connect to.
Member
Vespa super 150
Joined: 08 Jan 2019
Posts: 34

Fri Feb 15, 2019 12:18 pm quote
Oh alright thanks. Well I got it together but it isn't adjusted or anything. Anything I should do before firing it up? Everything appeared to go together nicely except for the brass screw in the back that pokes out of the carb box. That needed to be taken off and screwed on after I bolted the carb in. Wouldn't you know it, it was a 7mm bolt and that's the only socket I don't have on me. But anyway I got it on but it still probably needs to be tightened.

Anyway, anything to do before firing it up?
Hooked
Vespa P200, Primavera 130, VNA200, Italjet Pack-a-Way Moped, Ciao etc
Joined: 24 Oct 2014
Posts: 307
Location: Humboldt County, California
Fri Feb 15, 2019 12:37 pm quote
Humanbean wrote:
Anyway, anything to do before firing it up?
Confirm the jetting is the same as your old carb. That is assuming you haven't made any changes to the exhaust or cylinder?

You didn't say why you were replacing the carb. Also, search the forum for a how-to on adjusting the idle air screw in the back. That's the long brass screw you mentioned.

On carbs with the long screw, I cut a slot in it so I can use a screwdriver to adjust.
Member
Vespa super 150
Joined: 08 Jan 2019
Posts: 34

Fri Feb 15, 2019 12:41 pm quote
primavera130 wrote:
Humanbean wrote:
Anyway, anything to do before firing it up?
Confirm the jetting is the same as your old carb. That is assuming you haven't made any changes to the exhaust or cylinder?

You didn't say why you were replacing the carb. Also, search the forum for a how-to on adjusting the idle air screw in the back. That's the long brass screw you mentioned.

On carbs with the long screw, I cut a slot in it so I can use a screwdriver to adjust.
I'm using the jetting that the new carb came with for now. Mostly I just want to make sure it's working right before I move onto the exhuast.

That slot on the screw is a good bit of advice though, I might just copy you.

It doesn't need to run super good just yet, Ill worry about that when it's finished
Member
Vespa super 150
Joined: 08 Jan 2019
Posts: 34

Fri Feb 15, 2019 12:56 pm quote
Alright good news, it started right up and even seemed to idle alright on this cold as hell day. Probably needs an adjustment After I put in the new exhuast but I'm pleased with it. Thanks for the help primavera, what size jetting would you suggest for a stock cylinder, SIP road 2.0, and SI 20 20 carb combo?
Enthusiast
1979 P200E
Joined: 01 Jan 2018
Posts: 60
Location: Houston
Fri Feb 15, 2019 2:15 pm quote
Other people know better than I, but I believe the SIP Road 2.0 bumps your main jet up a couple points.
Hooked
Vespa P200, Primavera 130, VNA200, Italjet Pack-a-Way Moped, Ciao etc
Joined: 24 Oct 2014
Posts: 307
Location: Humboldt County, California
Fri Feb 15, 2019 3:04 pm quote
I didn't think about the fact that you are bumping up from a 20-15 to the 20-20.

What jetting did the 20-20 come with as compared to the 20-15?

The SIP Road is going to require bumping up the main jet and then plug chopping to get it right.
Member
Vespa super 150
Joined: 08 Jan 2019
Posts: 34

Fri Feb 15, 2019 7:17 pm quote
I'm not sure what the 20 20 came with, but I bought a set of jets that run from around 100 to 120? By chopping the plug you mean drilling into the heart shaped groove on the air cleaner right?
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