OP
@sarah avatar
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Molto Verboso
Stella
Joined: UTC
Posts: 1937
Location: Seattle, WA
 
Molto Verboso
@sarah avatar
Stella
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Location: Seattle, WA
UTC quote
I just pulled my plug after a 5 mile ride home from work mostly in third, sometimes fourth. It looks a bit hot to me but I wanted to check with you guys. I'm running my Stella with a Sito + with a 100 min & B7ES plug. Should I move up to a 102 main? Or would getting a cooler plug help? I haven't done any tuning so I don't know what the best next step would be. Does the colder weather have an effect on the jetting?

I couldn't get the camera to take a great picture so the plug isn't actually as white as it looks but it isn't a lot darker either. The flash washed it out a bit.

Thanks for the help.
Forum member supplied image with no explanatory text
Forum member supplied image with no explanatory text
@oopsclunkthud avatar
UTC

Banned
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Location: San Francisco
 
Banned
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UTC quote
never really liked plug chops as a jetting tool as it's hard to learn without blowing up a bunch of bikes first. It's really hard to teach and even harder to get by reading.

I'm assuming the 100 is stock, If so then going to a 102 can't hurt. Cold weather will make the bike run leaner. I like to keep it a bit on the rich side so when it's cold or when you are just going on reserve you feel a bit of an increase in power. If you don't feel an increase in power when it's cold then you are either running with perfect mixture or on the lean side.
OP
@sarah avatar
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Molto Verboso
Stella
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Location: Seattle, WA
 
Molto Verboso
@sarah avatar
Stella
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Location: Seattle, WA
UTC quote
Thanks Patrick. I'd also prefer to run a bit more on the rich side. The previous owner upjetted when he added the Sito + so I don't know what the stock jet was.

I did notice yesterday that it seemed to be a bit less powerful so I bet I am running a bit lean. I was planning on stopping by the shop on Wednesday so I'll pick up a 102 while I'm there.
UTC

Molto Verboso
PX200E X 2
Joined: UTC
Posts: 1934
Location: Lake Monticello
 
Molto Verboso
PX200E X 2
Joined: UTC
Posts: 1934
Location: Lake Monticello
UTC quote
the plug dosen't look blistered but it is rather white, I think your close, I'd try a 102
@provastian avatar
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Hooked
1985 T5 Mk1, 1984 PX200 EFL
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Hooked
@provastian avatar
1985 T5 Mk1, 1984 PX200 EFL
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Posts: 426
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OP
@sarah avatar
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Molto Verboso
Stella
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Posts: 1937
Location: Seattle, WA
 
Molto Verboso
@sarah avatar
Stella
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Posts: 1937
Location: Seattle, WA
UTC quote
Cool, thanks everyone. This is the lightest I've seen it so I was worried. It was in the mid-40's yesterday when I rode home which was the coldest it has been since I got the scooter this summer.

Would I need to go back to the 100 during the summer or could I stick with the 102 if it works well? My engine raced a bit on a long, hot (90's), fast ride this summer so maybe I should just stick with the 102. Or would the colder plug be better to switch to during the summer? I'm still learning the relationship between the jets and plugs and such.
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UTC quote
If the 102 works good in the cold I'd leave it in when it warms up again.
@chad avatar
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Olivia Newton-John
p200, vbb, gt200, px150, vnb
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Location: chippewa falls, wisconsin
 
Olivia Newton-John
@chad avatar
p200, vbb, gt200, px150, vnb
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Location: chippewa falls, wisconsin
UTC quote
haras, on stella speed there's a whole plug chop thread with great pics of the jet setups and how corresponding plugs should look it's in the technical help forum.
@ianp avatar
UTC

Destroyer of Worlds
LML Star 125, Vespa GT200
Joined: UTC
Posts: 2011
Location: London, United Kingdom
 
Destroyer of Worlds
@ianp avatar
LML Star 125, Vespa GT200
Joined: UTC
Posts: 2011
Location: London, United Kingdom
UTC quote
Stock jet on the Stella is something crazy like a 94.

102 is standard for a P150 with sito+ at sea level, so yeah give it a try.
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@sarah avatar
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Molto Verboso
Stella
Joined: UTC
Posts: 1937
Location: Seattle, WA
 
Molto Verboso
@sarah avatar
Stella
Joined: UTC
Posts: 1937
Location: Seattle, WA
UTC quote
Cool, I think I'll run and pick up a 102 today. There's a shop a few blocks away so I'll see if they have it in stock.
@rover_eric avatar
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Moderator
1965 Vespa SS180, 1963 Lambretta LI150
Joined: UTC
Posts: 6980
Location: Detroit, Michigan
 
Moderator
@rover_eric avatar
1965 Vespa SS180, 1963 Lambretta LI150
Joined: UTC
Posts: 6980
Location: Detroit, Michigan
UTC quote
thefuzzylogic wrote:
Stock jet on the Stella is something crazy like a 94.
I imagine the restrictive catalyzed exhaust has alot to do with that.
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Enthusiast
Joined: UTC
Posts: 99
Location: Tampa FL
 
Enthusiast
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Location: Tampa FL
UTC quote
something that I don't see mentioned that much is you wont get nearly a good enough lean/rich reading on a NEW plug.

I was trying to figure it out on brand new plugs and I was getting nothing.
Make sure its a plug with a few miles on it.
@jcwhitney avatar
UTC

Hooked
Lambretta SX, Stella, Honda
Joined: UTC
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Location: USA
 
Hooked
@jcwhitney avatar
Lambretta SX, Stella, Honda
Joined: UTC
Posts: 300
Location: USA
UTC quote
102 main jet, 55/160 idle jet, 160 air corrector, BE3 mixer, Vespa non-blue air filter or de-blue the Stella filter. Supposedly that is the hot setup. On mine I just put in a 100 main jet and the Sito+ but also at 1000-1300' asl. Nice coffee with cream color.
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@sarah avatar
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Molto Verboso
Stella
Joined: UTC
Posts: 1937
Location: Seattle, WA
 
Molto Verboso
@sarah avatar
Stella
Joined: UTC
Posts: 1937
Location: Seattle, WA
UTC quote
Thanks xianricca, this was a plug I've had for a few hundred miles so hopefully it gave an ok reading.

j.c., I just read about that set up today and am looking into adding that to my scooter in addition to the 102. I'll try the 102 first and then go from there. Thanks as always for your help.
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