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Half throttle to keep it going

 
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Delrey
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Joined: 15 Apr 2010
Posts: 3
Location: Cambridge MA
Stella 2005

PostPosted: Fri Apr 16, 2010 6:41 pm    Post subject: Half throttle to keep it going Reply with quote

Hello everybody,

I just got a Stella (2005 with only 200 miles on it). I have been riding different kinds of vespas my entire life, one Bajaj also, I am not a mechanic though.
My problem: the motor seems to be running smoothly, the carb is clean, the noise is what is supposed to be, it starts without a problem but in order to keep the engine going I have to keep at a very high throttle. If I release the throttle it will stop right the way. The idle screw won't change the situation at all.
I have looked at many posts here and on other forums. I am pretty sure the carb is fine, and it shouldn't be an air leak. The spark plug is new and the cable is firmly seated. I disconnected the kill switch and that is not the problem.
Please help!

Ciao

Michele


Last edited by Delrey on Fri Apr 16, 2010 6:55 pm; edited 1 time in total
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lmyers
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Joined: 04 Oct 2008
Posts: 573
Location: Tulsa, OK
02 Stella Red, 05 Stella (Kitty), 82 ET3, 74 VBC

PostPosted: Fri Apr 16, 2010 6:52 pm    Post subject: Reply with quote

You probably need to adjust the idle up just a bit.
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Delrey
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Joined: 15 Apr 2010
Posts: 3
Location: Cambridge MA
Stella 2005

PostPosted: Fri Apr 16, 2010 6:56 pm    Post subject: Reply with quote

Yes I forgot to mention that, the idle screw doesn't change anything for me... Sad
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Silver Streak
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Joined: 17 Mar 2010
Posts: 481
Location: Annapolis, MD
Stella 4T, Vespa LX190, Vespa LXV150ie

PostPosted: Fri Apr 16, 2010 8:09 pm    Post subject: Reply with quote

You say the carb is clean, but it sounds to me like the idle circuit in the carb has a clog somewhere.
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jmkjr72
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Joined: 11 Jul 2009
Posts: 784
Location: green bay wi
stella and a zuma

PostPosted: Sat Apr 17, 2010 12:09 am    Post subject: Reply with quote

i would have to agree that it is in the carb
either the idle circut or a massive vacume leak

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Silver Streak
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Joined: 17 Mar 2010
Posts: 481
Location: Annapolis, MD
Stella 4T, Vespa LX190, Vespa LXV150ie

PostPosted: Sat Apr 17, 2010 2:43 am    Post subject: Reply with quote

jmkjr72 wrote:
i would have to agree that it is in the carb
either the idle circut or a massive vacume leak


+1. The vacuum leak is a good possibility too. Good call.

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Delrey
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Joined: 15 Apr 2010
Posts: 3
Location: Cambridge MA
Stella 2005

PostPosted: Sat Apr 17, 2010 4:29 am    Post subject: Reply with quote

sorry for the ignorance: how do I fix a vacuum leak?
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jmkjr72
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Joined: 11 Jul 2009
Posts: 784
Location: green bay wi
stella and a zuma

PostPosted: Sat Apr 17, 2010 3:13 pm    Post subject: Reply with quote

a vacume leak is lletting more are into the intake system some where along the way

you find it and replace the gasket or hose that is bad
normaly it is a bad gasket on the carb or intake
you can try rebuilding the carb with all new gaskets and replacing the intake gasket
if you have taken the carb off you could even have the carb warped and not bolted down properly

if you can get it to hold any sort of idle it will be hard to tell but
get it running at the lowest steadiest rpm possible and spary some starting fluid around the intake area(trying not to get it down the throat of the carb) and listen for the rpms to increase or watch a tack if you have one

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olive 2008 setlla
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Silver Streak
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Joined: 17 Mar 2010
Posts: 481
Location: Annapolis, MD
Stella 4T, Vespa LX190, Vespa LXV150ie

PostPosted: Sat Apr 17, 2010 4:46 pm    Post subject: Reply with quote

jmkjr72 wrote:
a vacume leak is lletting more are into the intake system some where along the way

you find it and replace the gasket or hose that is bad
normaly it is a bad gasket on the carb or intake
you can try rebuilding the carb with all new gaskets and replacing the intake gasket
if you have taken the carb off you could even have the carb warped and not bolted down properly

if you can get it to hold any sort of idle it will be hard to tell but
get it running at the lowest steadiest rpm possible and spary some starting fluid around the intake area(trying not to get it down the throat of the carb) and listen for the rpms to increase or watch a tack if you have one


On a 2-stroke, it can be bad crankcase seals as well.

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