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Hi. I am looking to fit a Pinasco 177cc kit to my 1964 Vespa 150 VVB. At the moment I want to keep the stock 20/17 carb. Can anyone recommend what jets I need to fit?
⚠️ Last edited by TonyH999 on UTC; edited 1 time
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Someone should be along that knows more about jetting than me. Typically, a 20/20 sized carb or larger is used with a kit of that displacement or even to give the stock cylinder some extra punch. Any special reason you want to stick with the smaller carb?
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I just want to keep with the stock carb at the moment. I'm not really interested in speeding! I may change the carb later this year.
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Trust me , there will be no speeding with this cylinder with a 20.20.


If you are getting this cylinder, you really need the 20.20. Otherwise, just get a a standard 2-port 150cc cylinder for your stock factory sized carb.

Be3/160/114 with 20.20 and BOX exhaust
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I trust you...but if you were to use a 20/17 with the Pinasco 177cc kit [I have the kit] what jets do you think I should go for initially?
⚠️ Last edited by TonyH999 on UTC; edited 1 time
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Doing a Polini 177cc kit and leaving a 20/17 carb is not a bright idea. You are restricticting air flow. This kit deserves a 24/24 otherwise you are limiting the performance.
What exhaust are you running? don't feel guilty if you are not running an exhaust and bigger carburator due to budget, it is totally understandable, a lot of people actually do one mod then try it for weeks and add another mod, then try it and add another mod.

You should be at around 115 main jet. If you had an exhaust(I don't know) I would suggest around a 120 main jet. As far is the other jetting(pilot, atomizer, etc) normally for this kit most of the people runs a 55-160 and BE3 but you are running a choked up carburator for this kit. Your cylinder kit will give you some more power but definitely not the full potencial.
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Hi. Yes, I would look to fit a bigger carb as a seperate project after my reactions to the Pinasco Kit. I want the scoot as stock as possible...I'm not looking for a rocket ship...just a bit more power on the hills. Bear in mind its a 3 speed VBA/VBB on 8" wheels! The exhaust is a twin pipe unit popular in the '60's, its not a 'sport' exhaust, just gives you that sporty twin pipe sound.
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TonyH999 wrote:
Hi. Yes, I would look to fit a bigger carb as a seperate project after my reactions to the Polini Kit. I want the scoot as stock as possible...I'm not looking for a rocket ship...just a bit more power on the hills. Bear in mind its a 3 speed VBA/VBB on 8" wheels! The exhaust is a twin pipe unit popular in the '60's, its not a 'sport' exhaust, just gives you that sporty twin pipe sound.
how are you blocking the 3rd port?
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GickSpeed wrote:
how are you blocking the 3rd port?
I was reading through all this thinking the exact same thing.
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Its a twin port kit by Pinasco...I just want to run it with the 20/17 until I decide on the next step...maybe a bigger carb. I need suggestions for suitable jets for the 20/17 carb.
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I figured you were running the 2 port kit.

I don't have experience with the polini version but I do with the pinasco. trying to run it with a 20/17 was a frustrating experience of epic proportions.

I wound up putting on a 20/20 and it dialed in nicely.

I'm not saying that you can't do it, but the 20/17 really isn't made to flow enough to work well with that kit. there will be some portion of the throttle range that is well off of optimal. it isn't about performance, or making it a hotrod, it's about dialing it in so that the jetting is safe for the kit.

if you're going to insist on running the 17, I suggest you jet it fat to keep it safe. it'll run like dog water, but you won't kill the cylinder.
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TonyH999 wrote:
Its a twin port kit by Polini...I just want to run it with the 20/17 until I decide on the next step...maybe a bigger carb. I need suggestions for suitable jets for the 20/17 carb.
This is NOT a Polini 177 or any kind of Polini product.
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If I buy a 20/20 carb what jets do you suggest I try?
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GickSpeed wrote:
This is NOT a Polini 177 or any kind of Polini product.
maybe he's confused and meant pinasco?
the stock pic is pinasco so... *shrugs*
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TonyH999 wrote:
If I buy a 20/20 carb what jets do you suggest I try?
120 or 140 AC, BE4, with a 120 main and jet down from there.
(you'll probably wind up at 115-ish)
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Stick a four speed in it. kit and do the 20.20; you are really wasting your time otherwise. Really with kitting you should split that engine anyway if its not been done so in a while and ensure everything is good inside to take that extra power. Is your clutch adequate? You might end up with things exploding inside causing damage and bang goes your original engine with considerable expense repairing. If it were me i wouldnt bother unless the whole engine was being overhauled and upgraded internally.
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YES..YES.. YES..PINASCO it is!!!!! God knows where I got Polini from!!!!! [senior moment????] Sorry for the confusion everyone...
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TonyH999 wrote:
YES..YES.. YES..PINASCO it is!!!!! God knows where I got Polini from!!!!! [senior moment????] Sorry for the confusion everyone...
Well...I'm glad we got that out of the way.

I ran that same kit on my VBB for many years. It's a solid kit if set up correctly. I cannot agree enough with others that you need to upgrade the carb to a 20/20.

As to three versus four speed gearbox...that's up to you. Since you seem to be relatively happy with the current overall performance, just wanting more torque for hill climbing, don't worry about the gearbox. Ride it and enjoy.
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ferriswolf wrote:
Stick a four speed in it. kit and ....
I really like my three speed in the 62 Allstate with a 177 kit. I reshimmed the gear stack when the cases were opened and it's been awesome.
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I have heard good things about the pinasco 177 2 port. A couple of lads down my way fitted them on 150 supers and they seemed to keep up pretty well with the rideouts. I havent heard any horror stories thats for sure as yet.
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chandlerman wrote:
Well...I'm glad we got that out of the way.

I ran that same kit on my VBB for many years. It's a solid kit if set up correctly. I cannot agree enough with others that you need to upgrade the carb to a 20/20.

As to three versus four speed gearbox...that's up to you. Since you seem to be relatively happy with the current overall performance, just wanting more torque for hill climbing, don't worry about the gearbox. Ride it and enjoy.
Thanks Chandlerman. Do you remember what jets you used on your VBB?
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The 20/17 is kind of an oddball but it'll be fine for your 2-port iron Pinasco. Yes a 20/20 would breathe better, but Piaggio put em on 2-port Sprints.

Listen to greasy. I'd start with 140AC/BE3/ and maybe a 112 or 110. What air filter are you using?
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SoCalGuy wrote:
The 20/17 is kind of an oddball but it'll be fine for your 2-port iron Pinasco. Yes a 20/20 would breathe better, but Piaggio put em on 2-port Sprints.

Listen to greasy. I'd start with 140AC/BE3/ and maybe a 112 or 110. What air filter are you using?
So on a 20/17. Air bleed:140AC, Diffuser:BE3, Main jet:110 or 112. In the meantime [summerish] look for a 20/20 or 22/20?
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Sounds like a plan. You'll have no trouble finding a 20/20 carb. They're abundant and relatively inexpensive.

22/20 might take some time though as I don't think Dellorto ever made one of those.
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SoCalGuy wrote:
Sounds like a plan. You'll have no trouble finding a 20/20 carb. They're abundant and relatively inexpensive.

22/20 might take some time though as I don't think Dellorto ever made one of those.
There's a Vespa Jetex 22/20 on Ebay at the moment.
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TonyH999 wrote:
There's a Vespa Jetex 22/20 on Ebay at the moment.
Tony, best advice i can give anyone: buy your equipment from a local parts supplier. They will absolutely appreciated your business. They can also help you out on technical questions with the parts you are buying as well.
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SoCalGuy wrote:
Sounds like a plan. You'll have no trouble finding a 20/20 carb. They're abundant and relatively inexpensive.

22/20 might take some time though as I don't think Dellorto ever made one of those.
Pinasco kit is in and starts up OK...can't take it out 'cos its pissing down here in the UK. Bought a 22/20 Jetex [dellorto approved copy] what jets do you suggest I try?
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you may have trouble with getting jetting suggestions on a 22/20 because most of us have never even heard of them, much less ran them. still, i'm sure it can be made to work.

take some pics, we should have a look at this thing.
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sdjohn wrote:
you may have trouble with getting jetting suggestions on a 22/20 because most of us have never even heard of them, much less ran them. still, i'm sure it can be made to work.

take some pics, we should have a look at this thing.
I think its a 20/20. It was sold to me as a 22/20. I just got it in the post today...there is a brown label above the choke that says J-20/20 L5*. At the bottom of the intake it says 250-00-02. Is there any other way of checking?
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pics, pics, pics
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sdjohn wrote:
pics, pics, pics
It just looks like an average 20/20 Del...
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given what i remember about jetex from the lambretta world, I'm thinking spaco might be better. never seen one of these. it's new?
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sdjohn wrote:
given what i remember about jetex from the lambretta world, I'm thinking spaco might be better. never seen one of these. it's new?
Jetex make Dellorto carbs under licence...they are approved by Del...

JETS is the question. I've fitted a Polini 177cc kit and now the 20/20 carb and I want suggestions for jetting. I can't ride the scoot yet 'cos its still RAINING!!!
TIA.
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Start with a 140AC/BE4/125 main for jetting. That'll get you in the ballpark, maybe a little rich, but that's where you want to be.
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And don't give any thought to the pilot jet until the main jet is somewhere near. It will need to be bigger than stock, that's for certain.
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chandlerman wrote:
Start with a 140AC/BE4/125 main for jetting. That'll get you in the ballpark, maybe a little rich, but that's where you want to be.
Yes. As above but I have a 116 main in. Plenty of compression, starts easy on the choke, revs easy but not had chance for a run yet[too wet!].
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You're going to want richer than a 116 main.
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chandlerman wrote:
You're going to want richer than a 116 main.
I've got a 120 I can try...
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TonyH999 wrote:
I've got a 120 I can try...
That's the absolute leanest I'd start with on a 177.
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chandlerman wrote:
That's the absolute leanest I'd start with on a 177.
Air 140, main jet 120, diffuser BE3. Took it up the road and back seemed OK...Idle jet is 42, do I need to change the idle jet? [I also have a 40-130] There seem to be different idle jets, some drilled right through, some sealed.

[Note: the 40/130 doesn't seem to work, won't tick over!]
⚠️ Last edited by TonyH999 on UTC; edited 1 time
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