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Poor starting moped

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Farmingstock
Trackday Trickster



Joined: 17 Jun 2016
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PostPosted: 21:26 - 02 Jul 2025    Post subject: Poor starting moped Reply with quote
I have a 4T Piaggio Zip 50cc that will eventually start but takes forever.

Changed the plug (spark is fine)
Checked the valves (.10 and .15)
Changed the choke to manual
Charged battery fully
Changed the fuel
Checked the fuel pump (fine to the carb)
Cleaned the carb

The bike will start eventually and starts fine once it’s started but once left overnight or for long periods it takes forever to start and you get the feeling it isn’t going to start.

Any suggestions?
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A100man
World Chat Champion



Joined: 19 Aug 2013
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PostPosted: 21:49 - 02 Jul 2025    Post subject: Reply with quote
compression check?
____________________
Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600
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Farmingstock
Trackday Trickster



Joined: 17 Jun 2016
Karma :
PostPosted: 21:55 - 02 Jul 2025    Post subject: Reply with quote
A100man wrote:
compression check?


Not done one because the way the engine is located Can’t get a tester into the plug hole without removing the engine.

It runs fine once started and doesn’t lack power for one of them!
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sickpup
Old Timer



Joined: 21 Apr 2004
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PostPosted: 22:57 - 02 Jul 2025    Post subject: Reply with quote
Farmingstock wrote:
Not done one because the way the engine is located Can’t get a tester into the plug hole without removing the engine.


Get one with a rubber hose, not a push on one.

Iirc if you remove the under seat bucket you can get access to the head that way.
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