Malossi (Dellorto) 19 PHBG Carb on a Vespa ET2
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Enthusiast
2009 S150, 2017 GTS300Super, 2006 GT200
Joined: 18 Oct 2014
Posts: 96
Location: Houston
Mon Jun 10, 2019 2:06 pm quote
So a friend dropped of his 50cc ET2 along with a box of new parts and asked if I could install the parts and get the bike running again. Iíve already installed the new 70cc cylinder and piston, now itís time for the carburetor and boy does it have me stumped.

The ET2 has a single cable coming from the throttle that runs to a splitter under the floorboard. Inside the splitter is a little gizmo that the cable from the throttle terminates and the individual cables that lead to the carburetor and oiling system are attached.

Problem is now with everything reconnected I donít seem to have enough cable length. Iím shy about 2-3 cm. Iíve got the screw-in adjuster all the way in on the carb end, thatís the only place I could get any extra length.

Has anyone ever done this mod? Info on the web has been really scarce. I found a bunch about the actual tuning once I get the carb on but no real live info on how to actually install it.
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Granturismo 218
Joined: 04 Feb 2013
Posts: 5354
Location: South Carolina
Mon Jun 10, 2019 9:26 pm quote
You need this

https://scooterpartsco.com/et2/et2-air-and-fuel/throttle-cable-junction-box-to-carburetor-vespa-et2

The stock cable from the junction to the carburetor is too short for a DellOrto carb.
Enthusiast
2009 S150, 2017 GTS300Super, 2006 GT200
Joined: 18 Oct 2014
Posts: 96
Location: Houston
Tue Jun 11, 2019 4:33 am quote
Dang it youíve saved my @$$ again. Thank you sir. Order has been placed. I may finish this project after all!!
Hooked
GTS 250ie Super, Italjet Velocifero, Scarabeo 150, S50,ET4
Joined: 22 Nov 2016
Posts: 374
Location: Winston-Salem, NC
Thu Jun 13, 2019 5:58 pm quote
Motovista is a champ again.
Enthusiast
2009 S150, 2017 GTS300Super, 2006 GT200
Joined: 18 Oct 2014
Posts: 96
Location: Houston
Thu Jun 13, 2019 6:16 pm quote
Cable came today so I installed it. Such a tiny difference made everything better. Now to dismantle the oiling system since the carb has no provisions for it, mix up some pre-mix petrol, and start testing jets.
Enthusiast
2009 S150, 2017 GTS300Super, 2006 GT200
Joined: 18 Oct 2014
Posts: 96
Location: Houston
Fri Jun 14, 2019 7:52 pm quote
So tomorrow Iíll get started trying to tune this thing. I intend to follow a process I found posted on some board by a guy called Hyabusa almost 10 years ago. There is truly a scarcity of info out there. But this seems pretty complete.

I donít have a stock airbox, my friend had already lost that but told me to buy one if I needed to. He supplied me with a Malossi pod air filter. I have 8 jets ranging from 90 to 110. Iíve raised the needle in the carb one notch, Iíve got the choke installed, Iíve dismantled the oiling system, and Iíve mixed up some gas.

I plan to start with the 110 and then move down in jet sizes until it runs good. Iíve got a bunch of new spark plugs to check the burn color. Iíll have the old filter on. Questions I have are about the exhaust which Iím reading needs to be derestricted but I do not have the extra deadens pipe on the exhaust I see pictured in the posts Iíve found. Iím also wondering if Iíll benefit from a new intake manifold. I see one on ScooterPartsCo that fits 19-23 sized carbs. Do I need it? Should I find a stock airbox and use it?
Hooked
GTS 250ie Super, Italjet Velocifero, Scarabeo 150, S50,ET4
Joined: 22 Nov 2016
Posts: 374
Location: Winston-Salem, NC
Sun Jun 16, 2019 8:14 am quote
It is always best to use a stock airbox, it makes tuning easier and minimizes the risk of a soft seize. This is a good guide to tuning the Dellorto carb: https://www.mopedarmy.com/wiki/How_To_Tune_PHBG_Carburetors Be sure to have jets and needles on hand to tune it in better, a few slides and atomizers if you want to get it perfect. I suspect the Malossi carb comes pretty close to what is needed, Motovista can address that. As far as the manifold goes maybe someone else can address that. I think I saw on some thread here that there is an issue.
Molto Verboso
1979 P150X, 1983 P200E, 1987 T5, 1996 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 1527
Location: Veria, Greece
Sun Jun 16, 2019 8:49 am quote
FYI, your friend could have gone with a PHVA 17.5 or PHVB 20.5 and keep the oil injection, e-choke and the same length throttle cable. Both carbs are available from Piaggio...
Enthusiast
2009 S150, 2017 GTS300Super, 2006 GT200
Joined: 18 Oct 2014
Posts: 96
Location: Houston
Sun Jun 16, 2019 9:18 am quote
Pinkscooter wrote:
It is always best to use a stock airbox, it makes tuning easier and minimizes the risk of a soft seize. This is a good guide to tuning the Dellorto carb: https://www.mopedarmy.com/wiki/How_To_Tune_PHBG_Carburetors Be sure to have jets and needles on hand to tune it in better, a few slides and atomizers if you want to get it perfect. I suspect the Malossi carb comes pretty close to what is needed, Motovista can address that. As far as the manifold goes maybe someone else can address that. I think I saw on some thread here that there is an issue.
Thanks Pink, that guide has been my main reference along with 2-3 others that arenít quite as comprehensive. Based on what it and the others say I picked up several jets ranging from 110 all the way down to 90. Didnít get any extra needles, slides, or atomizers. Think Iíll start trying to source a stock airbox now.
Hooked
GTS 250ie Super, Italjet Velocifero, Scarabeo 150, S50,ET4
Joined: 22 Nov 2016
Posts: 374
Location: Winston-Salem, NC
Sun Jun 16, 2019 10:08 am quote
Scooter west and AF1 are my go to for all things Piaggio.
Enthusiast
2009 S150, 2017 GTS300Super, 2006 GT200
Joined: 18 Oct 2014
Posts: 96
Location: Houston
Sun Jun 16, 2019 10:39 am quote
Pinkscooter wrote:
Scooter west and AF1 are my go to for all things Piaggio.
Yeah I tried those as well as ScooterPartsCo and no one has it. Iíve got one on the way from Englandís eBay. Work can go on hold until that gets here. In the meantime Iíll put in the new variator kit with the white clutch spring and Makossi belt he brought me. Iím sure thatís gonna make a difference. When I pulled out the old variator three of the rollers were worn completely flat on one side so there wasnít much ďrollingĒ going on.
Molto Verboso
63 GL 150, 05 Typhoon, 09 Beo 200
Joined: 20 Jan 2007
Posts: 1716
Location: Grand Pothole Rapids, Michigan
Sun Jun 16, 2019 3:30 pm quote
I put a 20.5 Dellorto on my 05 2T Typhoon, with the stock air box, a 70cc Polini Corsa kit, and a aftermarket exhaust. I am running 4 gram Dr. PUlley sliders, mid range clutch springs, and a size 80 jet, and am 2 from the top with the slide adjustment.....Hope that helps.....
Enthusiast
2009 S150, 2017 GTS300Super, 2006 GT200
Joined: 18 Oct 2014
Posts: 96
Location: Houston
Sun Jun 16, 2019 6:19 pm quote
greg531 wrote:
I put a 20.5 Dellorto on my 05 2T Typhoon, with the stock air box, a 70cc Polini Corsa kit, and a aftermarket exhaust. I am running 4 gram Dr. PUlley sliders, mid range clutch springs, and a size 80 jet, and am 2 from the top with the slide adjustment.....Hope that helps.....
Quite helpful. Thanks. It's good to hear what worked for others. Another thread I read had a person with a setup similar to mine was using a 90 jet. There are many variables. When it's all said and done I'll have the Malossi 70cc kit, Dellorto 19, stock air box with the three holes cut in it according to the Malossi carb instructions, Leo Vince touring exhaust, and the Malossi variator kit with the white clutch spring.

I've never ridden a 50 before. What should I expect? I don't have an idea of what's fast or slow. My smallest bike is a 150S and then I've got a GT200 and a GTS300. The 150 feels ridiculously slow compared to the other 2 so I cannot imagine what 1/3 of that is going to feel like. I'm actually in the market for another GTS that I can put the Malossi head and cylinder and satisfy my need to tinker. I'm looking at one that's in the f/s section but it's a 12 hour round trip to pick it up and I checked shipping it ($700).
Enthusiast
2009 S150, 2017 GTS300Super, 2006 GT200
Joined: 18 Oct 2014
Posts: 96
Location: Houston
Thu Jun 20, 2019 3:38 pm quote
Having some challenges installing the Malossi variator that my friend brought. The spacer that came with the Malossi is about 1mm wider than the oil pump gear and 5.5mm spacer that sat behind the original variator. The new variator itself is thinner than the original though so when I remove the original gear and spacer and put on the Malossi one the variator slides on pretty far. So much that the belt doesnít touch the inside part of the variator when I put it on.

Iíve tried various combinations of the spacers/gear and it looks like the best combination is the original oil pump drive gear and the spacer that came with the variator. For anyone whoís done this swap does that sound correct?
Hooked
GTS 250ie Super, Italjet Velocifero, Scarabeo 150, S50,ET4
Joined: 22 Nov 2016
Posts: 374
Location: Winston-Salem, NC
Thu Jun 20, 2019 6:04 pm quote
About your question about 50cc compared to a Larger scoot. I have a Scarabeo 150 with the Rotax and a GTS250 as well as an S50 and SR50. The bigger scoots have more power and will take off very nicely, the 50's are definitely working really hard to take off. A well tuned 2 stroke 70cc will take off closer to the 150cc scoot. As you tune the CVT you'll feel when it's doing the best it can.
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