Thu Nov 18, 2021 2:54 pm

Member
Stella
Joined: 19 Sep 2020
Posts: 36
Location: Staten island
 
Member
Stella
Joined: 19 Sep 2020
Posts: 36
Location: Staten island
Thu Nov 18, 2021 2:54 pm linkquote
My Stella 177 is acting weird. Jerky feeling every time I let off the throttle. Seems to be in-sync with when the motor revs down and that "putt putt" sound comes back. It's almost like every time the scooter revs down, it feels like it wants to stall out but it does lurch.
I don't know any other way to explain it.
One of my friends said it might of been a soft seize? Idk
Thu Nov 18, 2021 3:24 pm

Moderibbit
1980 P200E - "Old Rusty", 1976 ET3 Primavera
Joined: 12 Jun 2008
Posts: 8630
Location: Atlanta, GA
 
Moderibbit
1980 P200E - "Old Rusty", 1976 ET3 Primavera
Joined: 12 Jun 2008
Posts: 8630
Location: Atlanta, GA
Thu Nov 18, 2021 3:24 pm linkquote
Is it truly every time? Because I think you're very unlikely to be softseizing that much and still running/have good compression, and you're very unlikely to be softseizing like that in really easy riding circumstances.

Does it idle ok?
Thu Nov 18, 2021 3:26 pm

Ossessionato
VSX, Stella 177, Stella 150, VNX1T, V9B1T
Joined: 20 Jul 2018
Posts: 3476
Location: Staten Island, NY
 
Ossessionato
VSX, Stella 177, Stella 150, VNX1T, V9B1T
Joined: 20 Jul 2018
Posts: 3476
Location: Staten Island, NY
Thu Nov 18, 2021 3:26 pm linkquote
I heard from a friend, he's working his main jet down from super rich to find the correct main. It's running like crap cause its rich. Soft seize was a suggestion in response to an issue when he was running way lean jetting and bone white plug at full throttle prior to having him go super rich to work down and find his correct main.

Thu Nov 18, 2021 5:07 pm

Member
Stella
Joined: 19 Sep 2020
Posts: 36
Location: Staten island
 
Member
Stella
Joined: 19 Sep 2020
Posts: 36
Location: Staten island
Thu Nov 18, 2021 5:07 pm linkquote
Well yeah lol I guess I forgot to mention my last jetting made the plug bone white. Think Swiss is right it definitely has to do with jetting.
Thu Nov 18, 2021 5:11 pm

Moderibbit
1980 P200E - "Old Rusty", 1976 ET3 Primavera
Joined: 12 Jun 2008
Posts: 8630
Location: Atlanta, GA
 
Moderibbit
1980 P200E - "Old Rusty", 1976 ET3 Primavera
Joined: 12 Jun 2008
Posts: 8630
Location: Atlanta, GA
Thu Nov 18, 2021 5:11 pm linkquote
Well, if you're softseizing like that your idle circuit is probably lean. Pull the head and you will probably see a scuffed up mess in the bore if it's softseizing that much
Thu Nov 18, 2021 6:30 pm

Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella
Joined: 16 Jun 2011
Posts: 4244
Location: Nashville
 
Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella
Joined: 16 Jun 2011
Posts: 4244
Location: Nashville
Thu Nov 18, 2021 6:30 pm linkquote
I was thinking it sounded like OP was describing hunting when returning to idle, which is also a symptom of a too-lean motor.

If it's soft seizing, then the motor is dying, which is usually caused by a lean carb, but could also be caused by a lack of lubrication. Is this an autolube or pre-mix motor?

If you can provide a little more detail and a picture of both your motor and the spark plug, that'll help a lot to do a little Internet Diagnosis.
Thu Nov 18, 2021 7:37 pm

Ossessionato
62 VBB1T Round Tail W/ leaner sidecar
Joined: 26 Jan 2019
Posts: 2639
Location: california
 
Ossessionato
62 VBB1T Round Tail W/ leaner sidecar
Joined: 26 Jan 2019
Posts: 2639
Location: california
Thu Nov 18, 2021 7:37 pm linkquote
Surging on deceleration is almost certainly lean condition.
It could be you have developed an air leak - making it weaker over whole range.
You could have something in your pilot jet.
Head bolts could be loose.
Carb base could be leaking.
Etc.

This assume you've not recently made changes to jetting/oil mix ration/ air filter/ other carb adjustments...

But generally - that surge is most likely a lean condition as CM flagged.
Thu Nov 18, 2021 7:42 pm

Ossessionato
VSX, Stella 177, Stella 150, VNX1T, V9B1T
Joined: 20 Jul 2018
Posts: 3476
Location: Staten Island, NY
 
Ossessionato
VSX, Stella 177, Stella 150, VNX1T, V9B1T
Joined: 20 Jul 2018
Posts: 3476
Location: Staten Island, NY
Thu Nov 18, 2021 7:42 pm linkquote
He's a good 20+ points too rich main and with a safe idle jet. Not a soft seize.. just way too rich jetting. Lets walk that down into usable range finally before you start worrying about how it runs!
Thu Nov 18, 2021 7:47 pm

Ossessionato
62 VBB1T Round Tail W/ leaner sidecar
Joined: 26 Jan 2019
Posts: 2639
Location: california
 
Ossessionato
62 VBB1T Round Tail W/ leaner sidecar
Joined: 26 Jan 2019
Posts: 2639
Location: california
Thu Nov 18, 2021 7:47 pm linkquote
Swiss - I love it.
No idea how you know his jetting - but sounds like you have the insights...
Ignore my prior - Swiss at the wheel.
Thu Nov 18, 2021 7:49 pm

Ossessionato
VSX, Stella 177, Stella 150, VNX1T, V9B1T
Joined: 20 Jul 2018
Posts: 3476
Location: Staten Island, NY
 
Ossessionato
VSX, Stella 177, Stella 150, VNX1T, V9B1T
Joined: 20 Jul 2018
Posts: 3476
Location: Staten Island, NY
Thu Nov 18, 2021 7:49 pm linkquote
charlieman22 wrote:
Swiss - I love it.
No idea how you know his jetting - but sounds like you have the insights...
Ignore my prior - Swiss at the wheel.
Because I've been helping him offline. I now know how Jack must have felt when he was constantly telling me for a year or more to make it too rich and then walk it down till its clean again, and I was too worried about how it wasn't running right when it was super rich!

He'll get there faster than I did.
Fri Nov 19, 2021 5:21 am

Moderibbit
1980 P200E - "Old Rusty", 1976 ET3 Primavera
Joined: 12 Jun 2008
Posts: 8630
Location: Atlanta, GA
 
Moderibbit
1980 P200E - "Old Rusty", 1976 ET3 Primavera
Joined: 12 Jun 2008
Posts: 8630
Location: Atlanta, GA
Fri Nov 19, 2021 5:21 am linkquote
OP needs to just listen to the locals then - you'll get it sorted faster offline with "real" eyes on the problem, and a tip for when you turn to the webs is to provide the info you have (E.g., what your jetting is and what has already been told or have tried to troubleshoot)
Fri Nov 19, 2021 5:27 am

Ossessionato
2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others
Joined: 26 May 2013
Posts: 4189
Location: That bushfire place
 
Ossessionato
2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others
Joined: 26 May 2013
Posts: 4189
Location: That bushfire place
Fri Nov 19, 2021 5:27 am linkquote
Stop being a jerk & stay hard on the throttle, problem solved!
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