Getting the best fuel economy, what mileage do you get?
Post Reply    Forum -> Not-So-Modern
Author Message
Veni, Vidi, Posti
a herd of easy shifty rats
Joined: 22 Nov 2010
Posts: 6726
Location: seattle/athens
Mon Nov 19, 2018 1:58 am quote
Let's say you are planning a long trip and you are preparing your scooter. Let's also say that you have plenty of power and would sacrifice some of it for more miles/KM between fill ups. What to do? 20/20 carb on your 200? A tamer muffler? Different timing? I don't have a clue...

Also, if you check, what kind of mileage are you getting w/ what motor? I confess I've never checked . So who's getting the highest mileage on what bike?

All this thanks to Jack's earlier post:
Jack221 wrote:
If there are issues with jetting there are a few signs to look for that will make the fuel go a bit further. These maybe won't help not running out, as it will go longer between fill ups but will make it a little more economical, nicer to ride and possibly faster as well.

Doesn't matter if your scooter is factory stock or a 10,000 rpm screamer, the rules are the same. First thing to look for is the end of the exhaust pipe. If there is wetness or oil marks around the tailpipe, then the main jet is too big.

Next is the exhaust stub and downpipe. If there is black splooge dribbling out, then only the pilot jet (and/or needle jet for the big carbs) is too big.

Apparently a perfectly running 2 stroke doesn't burn 25% of the fuel, one with the jetting wrong could waste an awful lot more.
1966 Sprint 150 & px200 and a shed full o shit
Joined: 15 Aug 2016
Posts: 113
Location: New Zealand
Mon Nov 19, 2018 3:28 am quote
Stock PX200 disc loaded up on long trip
Done many long trips. Best I recall is about 150KM on a tank (98 premium octane). Still had a bit left. I was surprised. Just cruising peacefully with another on an LML150. No traffic. Had a windscreen. Prolly doing 80 KMPH. Had a fuel can with me. 120-130KM is more the norm at WOT.

Don't forget to top up the autolube every 3 - 4 tanks or so. Empty 2 stroke bottles can be filled with petrol if you know there is a big gap between petrol stations.

Only one gas stop today. Can strap to seat.

1979 P200e
Joined: 18 Mar 2013
Posts: 2356
Location: West of Boston
Mon Nov 19, 2018 5:36 am quote
I've posted a few times, my jetting (as I got the scoot, third owner) is a bit weird, according to the guy who rebuilt my carb 5 years ago.

Hang on a sec while I search for my jetting (I don't have it memorized)....

120 BE4 109 on a 24/24 carb

and then SoCal Guy said
No, you aren't necessarily leaner (than stock). Somewhere along the line, somebody swapped the stock jets on your scoot for a slightly more fuel efficient set up.

The stock air corrector is 160. The 120 on your scoot has a smaller opening, thus allowing less air to enter the mixture. All other things being equal, that would make the set up richer.

But the 109 main jet you have is leaner than the stock 116 - it allows less fuel to enter the mixture. It more or less balances out the richer air corrector.

As you say, the scoot runs fine. The combination of leaner main and smaller air corrector isn't "wrong" per se. You may just be sacrificing a little power and top speed for fuel efficiency.
BTW, the answer is no, the scoot was never in California. I got it from a guy in New York (Buffalo), he got it from someone in Florida. No clue as to where it started out new...or if I'm the third owner.
1979 P200e
Joined: 18 Mar 2013
Posts: 2356
Location: West of Boston
Mon Nov 19, 2018 5:43 am quote
I usually get 70-80 mpg on my P200 with the above setup, auto lube intact. I'm happiest tooling around between 45 and 50, though I don't know if that's me or the scooter. I can get it up to 60 or so, but it takes a long time to get there.

And I have a fly screen on it....
Veni, Vidi, Posti
a not so normal vbb2 '64, a weirdo vbx '86 and a not so normal pts100 '82
Joined: 15 Jun 2009
Posts: 5370
Location: Indo
Mon Nov 19, 2018 11:25 am quote
uncle scrooge
well, if u want a longest mileage, it will be me

from my recent touring last september, my pink can run till 80km/hour-100km/hour depend whether the road is smooth or not as for the fuel since i am using a 20-20 carb, custom pipe and polini 177 i end up with 34.2km for a litre of low ron fuel

and yes i have a windshield as well

good luck with the long trip Brother T and cheer
68sprint,65super,64Allstate,55 Allstate
Joined: 20 Jul 2017
Posts: 253
Location: Central california
Mon Nov 19, 2018 1:04 pm quote
Fuel economy
So I had the exact same jets and stack up as Larrytsg has on his p200. I also have a p200 in a 68 sprint all stock. It ran awesome, started with one kick, but at any speeds over 50mph it literally would run out of gas. So I went with another std. set-up.
120 main
BE3 mixer
160 air
55/160 pilot
I have noticed that the gas mileage is not really good at speeds above 50mph. Gas mileage is pretty good if I keep the rpms down. Best way to get better gas mileage in a car is to drive way to increase gas mileage on your scoot is to lower the rev’s. Where’s the fun in that, some might add. Scott
2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others
Joined: 26 May 2013
Posts: 3735
Location: Millbin, Ostrayleea, mate
Wed Dec 05, 2018 5:48 am quote
Carry more fuel!
I simply carry more fuel!
Shitloads more, enough that I have a low speed wobble due to the fuel sloshing around, & I STILL run out before Ginchi & use about 40% more with a 177cc vs a 221cc !
MV Santa
GTS250, 1960 VBA, 1975 VBC, 1980 P200E cutdown
Joined: 04 May 2010
Posts: 4126
Location: Sedgwick, Kansas
Wed Dec 05, 2018 6:57 am quote
I read in the service manual for my VBA that the rated fuel economy was 100mpg (42.5kpl). I thought "No effing way". It explained how to test it. Ride at 20mph (32 kph). With no hills, no wind and without stopping. The only way to do that was on a track and I didn't have access to that. I did find a way to get a ballpark estimate. I rode down a quiet, level road at different speeds. I the turned off the fuel tap and counted how many utility poles went by until it sputtered. You know what? Based on the mileage that I knew I was getting at WOT 100mpg was achievable. Mileage went down inversely proportional to speed. However, I wouldn't have the patience to ride at that speed unless I was trying to reach the next gas station. I could almost run fasrer.

Ebeth, that's a pretty impressive number that you're getting. Whats the price of gas there?
Modded Vespa 2017 GTV 300, BMW 2017 C650GT, Ural 2019 Gear Up
Joined: 21 May 2017
Posts: 4653
Location: Downtown Toronto
Wed Dec 05, 2018 9:25 am quote
Can't say for sure but I probably get about the worst gas mileage of any Vespa here. The Malossi kit on the most aggressive setting and the way I ride it's almost as if you could look down at the gauge and watch it go down.
1974VLB 1979VSX 1974V9A
Joined: 12 Sep 2014
Posts: 632

Wed Dec 05, 2018 11:24 am quote
There are some people out there very into this.


Molto Verboso
1979 P150X, 1983 P200E, 1987 T5, 1996 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 1383
Location: Veria, Greece
Wed Dec 05, 2018 11:53 am quote
I'm at 6,5lt - 7,5lt /100Km on highway trips, cruising at 80Km/h - 90Km/h on my Blue P. I am pretty pleased, considering the power I can get from the engine. Of course, a 5lt fuel canister is always strapped to the floor. I am preparing a 12lt fuel tank to replace the original...
1964 GS 160 MK II, 1967 Vespa GT, 1968 SS180, 1964 Vespa GL, 1964 Vespa VBB, 2006 Buddy 125, 2013 BMW C650GT
Joined: 07 Apr 2008
Posts: 2902
Location: Boca Raton, Florida
Wed Dec 12, 2018 5:15 pm quote
I will admit that fuel mileage is one of the least of my concerns. I run a 2 gallon tour tank on my 67 GT cannonball bike.

See the CHT starting to rise, slow down easily, run out of fuel, shift to neutral, hit reserve, put in gear, dump clutch, restart and run, turn on tour tank valve, wait 7 minutes, turn off tour tank valve, turn from Res to Run...keep riding with a topped off tank!

I think on that bike I used 55 mpg for planned fuel stops.
Your Rally Here   vespa scooterwest scooter west Motorsport Scooters   Yelcome Leather Top Cases and Roll Bags for Piaggio Vespa PX LX LXV GTS GTV
Post Reply    Forum -> Not-So-Modern
[ Time: 0.4459s ][ Queries: 25 (0.0648s) ][ Debug on ]