howi76
2nd Class Ticket
Posts: 14
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Post by howi76 on Jun 28, 2014 5:52:56 GMT
Hi, can anyone help me out. I've just bought a Sito plus exhaust for my 2007 model Vespa PX and plan on fitting it this weekend and putting a larger main jet in. I know I should take it apart and look myself but I don't have a lot of time and wanted to order one ASAP. Does anybody know the size of the carburettor main jet on a untouched 2007 Vespa PX carburettor? I'm guessing they all must start off as a standard size? any help would be much appreciated many thanks Howard.
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howi76
2nd Class Ticket
Posts: 14
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Post by howi76 on Jun 28, 2014 21:58:57 GMT
Cheers gazpx, very useful info mate, much appreciated Take care Howard.
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howi76
2nd Class Ticket
Posts: 14
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Post by howi76 on Jun 29, 2014 22:08:23 GMT
Exhaust fitted and got rid of the secondary air system fully. Still not had time to look at the main jet yet, I will strip it down after work tomorrow and let you know the size. The exhaust sounds nice though I give it a quick go up and down my street. Had a look at the spark plug before hand and it didn't have that nice orangy colour, hopefully when I sort the jet and drill the air filter it should be good. I will replace the spark plug for a new one. What would be the best stuff to clean the air filter? or should I buy a new one? Oh by the way I couldn't get the exhaust to fit dead snug up to the engine pipe it's very close though about 1 or 2 mil away if that, that's the closest the Sito plus would let me get it and I used a lot of brute force. Sorry to waffle, I'll keep you posted Cheers Howard.
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Post by rab on Jul 2, 2014 19:07:47 GMT
For what a filter costs new id just replace it . if its the metal mesh type hot soapy water works fine just remember to let it dry properly
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howi76
2nd Class Ticket
Posts: 14
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Post by howi76 on Jul 7, 2014 19:25:43 GMT
Hi guys, finally finished the up-jetting, drilled the air holes in the air filter body and did the plug chops, ending up with a nice brown colour and a vast improvement in performance and sound, it feels like a new bike again. With the help from you's I found it a lot less complicated than I thought it would and yes the MAIN JET was a 96 and I ended up changing it to a 100 and it responds well to that. Thanks to everyone who shared there advice Cheers! Howard :-)
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vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 26, 2014 9:06:46 GMT
98 jet is the daddy
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Post by haggis120 on Jan 4, 2015 21:36:46 GMT
Howi just out of curiosity what setting on your mixture screw with the 100 jet. Im doing the same just now and it would be good to see if there is a big difference.cheers Jim
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me
High Number
Posts: 105
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Post by me on Jan 5, 2015 7:42:17 GMT
Leave the screw where it is.... its got nothing to do with main jet only for pulling away. a nicely set up air scew will let the bike pull away cleanly.
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Post by haggis120 on Jan 5, 2015 9:46:37 GMT
Ok, but why then does this need adjusting when I do plug chops going full throttle for a few miles. Or have I got it all wrong?
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Post by henri on Jan 5, 2015 9:51:46 GMT
the mix screw is adjusted at a fast tickover til the engine runs as steady as poss ,an then tickover is lowered to where scoot will run an not stall on a shut throttle , once set like this it shouldnt need moving again when chopping , a full throttle chop is to see what ya main jets like an thats the only jet ya change to get the right colour on the plug ,ok , H
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Post by haggis120 on Jan 5, 2015 10:26:46 GMT
Ok excellent thanks for that I had it all wrong. That has made it a lot clearer. Thanks!
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