Hi all,
I just bought a GIANNELLI Classic Sports Exhaust from Italy, and fitted it to my 03 plate PX125 disc over the weekend. Makes a nice sound, and was easy to fit. I'm getting a fair bit of rough running at low revs with it fitted though, so I'm guessing I should upjet? Any suggestions please as to what jet sizes I should fit?
GIANNELLI Classic Sports Exhaust- do I need to upjet?
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Pompeydave
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Pompeydave
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- Joined: Thu Sep 20, 2012 1:16 am
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Anyone got any suggestions at all please?
96 standard. try 102,100 or 98 main and check your plug
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Pompeydave
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Ok, thanks. As it's a bit hesitant low down is it worth upping the pilot too?
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mick1
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If it's hesitant it sounds as though you're running rich rather than lean ? what's your plug colour ?
Try half a mile at 1/4 throttle then check plug, do the same at 1/2 and full, this should give you an idea of where you are lean/rich.
Try half a mile at 1/4 throttle then check plug, do the same at 1/2 and full, this should give you an idea of where you are lean/rich.
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Pompeydave
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Hi all, tried it with a 102 main and upped the pilot from a 45/140 to a 48/140. Low end hesitancy is now gone and there's a noticeable improvement in power further up the rev range too. Plug is a nice cocoa brown colour too at all throttle setings.
I dug out my old July and Aug 2013 copies of Scootering, and their feature comparing 20 different Vespa exhausts shows that the Giannelli is well made, but not particularly efficient as a pipe compared with some others, so I think this could be as good as it gets. The bike quickly runs out of puff above 50mph, so long term a Malossi 166 kit and some engine casing work with possibly a PX200 24/24 carb to retain the use of autolube might be the way to go.
Cheers for the advice chaps...
I dug out my old July and Aug 2013 copies of Scootering, and their feature comparing 20 different Vespa exhausts shows that the Giannelli is well made, but not particularly efficient as a pipe compared with some others, so I think this could be as good as it gets. The bike quickly runs out of puff above 50mph, so long term a Malossi 166 kit and some engine casing work with possibly a PX200 24/24 carb to retain the use of autolube might be the way to go.
Cheers for the advice chaps...