Polini exhaust

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Hotdog
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Fri Apr 12, 2019 8:43 pm

Anyone fitted a Polini original exhaust to a standard Vespa px200 ? As I would appreciate any advice on jetting the carb. Also any feedback on performance etc. Thanks

Hotdog
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Mon Apr 15, 2019 6:56 pm

Ok I will try with a 125 main jet and work down, but when I spoke to someone from reedspeed albeit about a sip 2 exhaust they said you don’t have to change jets or timing as they are designed to be a straight swap!

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Bofs
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Tue Apr 16, 2019 8:47 am

I`ve been running one on mine for a while now. Changed from JL r/h and the difference was massive. The JL was dead down low but the Polini restored that and still had the same if better top end power. I`m on a P200e with BGM top end( which is just a standard 200 top end in all but name) I had a 124 main in with the JL and now run a 122. I ride basically flat out all the time and it`s perfect. Timing at 19 degrees and temp never over 340 degrees f. Planning to advance timing a bit.
I`ve seen 6500 rpm on the flat but normally it`ll rev to 6200 which equates to mid 60s mph in the real world.
Muffspeed....no muff too tuff
Bad Samaritans SC

1983 MotoVespa P200E
1957 Zundapp Bella 500 Auto

Hotdog
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Tue Apr 16, 2019 3:39 pm

Thanks will try a 122 main jet. Would i be correct in saying 1997 px200 electric start timing is set 23 degrees ?

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Bofs
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Wed Apr 17, 2019 9:20 am

I think from the factory the later electric start models had the ignition backed off a bit and set between the A and IT marks but only one way to be sure. Pop the flywheel.
My mates bog standard P200e still runs 23 degrees problem free and that`s with the crappest two stroke he can find :D
Muffspeed....no muff too tuff
Bad Samaritans SC

1983 MotoVespa P200E
1957 Zundapp Bella 500 Auto

Hotdog
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Wed Apr 17, 2019 9:04 pm

Ok, will have to invest in a flywheel puller.

eibargum
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Wed May 29, 2019 11:29 am

Hotdog wrote:
Mon Apr 15, 2019 6:56 pm
Ok I will try with a 125 main jet and work down, but when I spoke to someone from reedspeed albeit about a sip 2 exhaust they said you don’t have to change jets or timing as they are designed to be a straight swap!
Iam surprised they said that Mr Dog, on my standard set up I had to go up four on the main to 122 to get the same plug colour as I had using the standard pipe with a 118 in. plug was white with 118 in using the SIP 2.

Hotdog
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Thu May 30, 2019 7:52 pm

I to was surprised, that’s why i chose to ignore their advise and ask for advice on here.

eibargum
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Sun Jun 02, 2019 5:52 pm

Hotdog wrote:
Thu May 30, 2019 7:52 pm
I to was surprised, that’s why i chose to ignore their advise and ask for advice on here.


Wise man, ;)

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