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Vespa Rally 200
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Posts: 6
Location: San Francisco
 
Member
Vespa Rally 200
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Location: San Francisco
UTC quote
My restored (2 years) 1972 Vespa Sprint stalls out going uphill. Starts up on the 3rd kick every time, idles fine and revs fine. When I pull out the choke the bike then runs fine up the hill back to my home in hilly San Francisco. I put out both of the jets, cleaned them out but didn't make any difference. That's all I'vd done so far. Any suggestions on why this is happening is greatly appreciated.

It was running fine prior to the recent 2 months of much needed rain in the Bay Area.
@ruffstuff avatar
UTC

Hooked
2006 px125
Joined: UTC
Posts: 120
Location: Not Sunny Southport
 
Hooked
@ruffstuff avatar
2006 px125
Joined: UTC
Posts: 120
Location: Not Sunny Southport
UTC quote
Is there anything that could be pinching a pipe or wire when all the weights loaded towards the back like going up hill ?

Is all the fuel system correct, running of fuel pipe so on as to not hinder flow when the angle shifts, ie pipe too long & low so no gravity feed?

Get a few big matescreen or some wood/straps etc & truse to recreate the angle so you can have a nose
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Addicted
SS208, SX250 , RD's and a K1300s and an RZ350 and TZR250
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Addicted
SS208, SX250 , RD's and a K1300s and an RZ350 and TZR250
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Posts: 567
UTC quote
Slow fuel flow
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Veni, Vidi, Posti
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Location: Tega Cay, SC
 
Veni, Vidi, Posti
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Location: Tega Cay, SC
UTC quote
Are you saying that you are running the scoot on choke up the hills?
@championstuff avatar
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Hooked
1979 P125X
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Posts: 359
Location: Everett Wa
 
Hooked
@championstuff avatar
1979 P125X
Joined: UTC
Posts: 359
Location: Everett Wa
UTC quote
i would try a new fuel tap.
OP
UTC

Member
Vespa Rally 200
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Posts: 6
Location: San Francisco
 
Member
Vespa Rally 200
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Location: San Francisco
UTC quote
Yes, it stalls going uphill, I quickly pull out the choke (instinctfully) and the engine came to life-made it up the hill to the garage.
@subetherbass avatar
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Ossessionato
1997 Italjet Formula 125, 2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others
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Location: Australa, Mate
 
Ossessionato
@subetherbass avatar
1997 Italjet Formula 125, 2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others
Joined: UTC
Posts: 4779
Location: Australa, Mate
UTC quote
Float level is wrong?

You brought a Sprint, not the Pikes Peak version?
OP
UTC

Member
Vespa Rally 200
Joined: UTC
Posts: 6
Location: San Francisco
 
Member
Vespa Rally 200
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Posts: 6
Location: San Francisco
UTC quote
Resolve this problem by leaving the choke out about 1/8" from closed position. Not sure why but it works and runs fine. The choke has to move from fully open until the engine warms to the 1/8" position. Pulling the choke out to 1/8" from closed position won't work.
@socalguy avatar
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bodgemaster
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
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Location: So Cal
 
bodgemaster
@socalguy avatar
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
Joined: UTC
Posts: 7141
Location: So Cal
UTC quote
Well... that's not really a resolution. The scoot wasn't intended to be run with the choke even partially out.

My money's on fuel line's either a couple of inches too long or it's not routed around the tank correctly. Should be a simple fix, might as well just do it.
OP
UTC

Member
Vespa Rally 200
Joined: UTC
Posts: 6
Location: San Francisco
 
Member
Vespa Rally 200
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Location: San Francisco
UTC quote
Rode the Sprint into Scooter Center, SF with the choke half way out. Confirm by them that there's a bad air leak with the engine. Need to have the engine go through a 100% tear down and replace all seals, etc. Will post update.
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