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Hi I have a Vespa PX125 2016 70th anniversary edition and I am thinking of buying a Zeus CDI. Apart from a Sip 2 racing exhaust it is completely stock. My question is I know that I will have to upjet the carburetor but could somebody please help me out on the size of the main jet and is it a push on jet or a screw in? Any advice would be much appreciated. Would I have to upjet the other jets too? Thanks for taking the time to read this and I hope someone could help me out. Cheers.
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Jonny Ray wrote: Hi I have a Vespa PX125 2016 70th anniversary edition and I am thinking of buying a Zeus CDI. Apart from a Sip 2 racing exhaust it is completely stock. My question is I know that I will have to upjet the carburetor but could somebody please help me out on the size of the main jet and is it a push on jet or a screw in? Any advice would be much appreciated. Would I have to upjet the other jets too? Thanks for taking the time to read this and I hope someone could help me out. Cheers. Good looking scoot! I don't know the zeus so can't comment there... As far as your main jet goes, you *should* be able to change the main jet without messing with the rest of the stack. It is just the tip….(ahem)…. And it's easy to pull off. Just unscrew the main stack from the carby first. IIRC, Stock main is a 100, so I would order 3 jets. A 106, 104, and a 102. Start with the 106 and work down until it doesn't feel boggy. Smart money is the 104 will be the winner. YMMV |
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Birdsnest wrote: Cheers! Good looking scoot! I don't know the zeus so can't comment there... As far as your main jet goes, you *should* be able to change the main jet without messing with the rest of the stack. It is just the tip….(ahem)…. And it's easy to pull off. Just unscrew the main stack from the carby first. IIRC, Stock main is a 100, so I would order 3 jets. A 106, 104, and a 102. Start with the 106 and work down until it doesn't feel boggy. Smart money is the 104 will be the winner. YMMV As to the zeus, are you sure you really need it? I guess you are doing this to get over the RPM restrictor, but quite frankly you are very unlikely to hit more than 6200 RPM on what you got. I think on the restrictor it starts to plummet way over 6200! Something like 7k. Pop you big jet stack off from under your air filter, get a magnifying glass or use your phone magnifyer and read the number. If it says 96 then do what Birdsnest says, get a 100/102, id be tempted to stay with the 102 for the cold weather and the 100 for the hot. You can get a 101 which is what I ran with the same rig as a compromise balance between seasons. You should really take advantage of the massive 0.5bhp increase with a drilled filter, in which case put in a 102 if you do this. As the px125 is low HP anyway, a 0.5 bhp gain for using a drill is cheap bang for no bucks. |
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Birdsnest wrote: Thanks for correcting me on the PX main size! Should have looked it up before posting. |
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Well... even if I looked it up I would have gotten it wrong. :-/
Looks like the old (early 80's) P and PX125s were 99/100. https://scooterhelp.com/scooters/VNX2T.px125e.html I bet they reduced it due to emissions in later years? |
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Birdsnest wrote: Well... even if I looked it up I would have gotten it wrong. :-/ Looks like the old (early 80's) P and PX125s were 99/100. https://scooterhelp.com/scooters/VNX2T.px125e.html I bet they reduced it due to emissions in later years? https://www.visordown.com/news/product-news/airbag-motorcycle-trousers-are-now-thing-apparently |
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Birdsnest wrote: *laughs/shakeshead* "Air bag trousers" |
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