Modern Vespa

Hi all, I have fitted a new wiring harness in my VBB and the colours don't match what's in the terminal box on the engine - is there a standard colour code for these or is there a way to test what wire goes where ???

Pictures of your junction box?

https://www.scooterhelp.com/electrics/pages/VBB2.150.html

This is it …..

If it's a stock-style VBB stator with points, what are the colors coming off of it? It looks like should be red, double yellows, green and black, according to a bike I re-did last year.

If you replaced your stator with a BGM let's say, then it may also have a blue added to that.

How about wires from your harness? Mine are black, red, yellow, light blue, dark blue, green... and my junction box is the brown bakelite with 4 posts not 5 like yours.

Then I also have a red jumper between the JB and the external coil (and two black wires grounded to the coil bolt/frame.

Mine has been in this state for quite a while - as you can see the new harness colours don't quite match the diagram I will have to bell it out and work out what does what . That will be the easy bit - working out what is what coming out of the engine is where it's going to get ugly .
I don't have a flywheel puller to be able to see what wire goes to what coil , may have to invest in one I guess

Appears to be a 28mm thread , measured at a tad over 26 mm with verniers

I went to our local Scooter Shop today hoping to buy a puller - he told me it must be a non genuine flywheel if it has an internal thread in it ??? He showed me a Piaggio one and it had no threads so I assume it's a non genuine part - engine number is this - I would have thought with the logo stamped into it it would be a genuine item but I suppose it could be stamped by anyone….

That serial number comes up as a '64 150.

That's what the bike is 👍

Is there a circlip under the nut? There should be. Many times on these early 60s bikes, the nut is self extracting with the correct socket, and you won't need a flywheel extractor tool. But you will need a flywheel holder too.

Do you have a manual to help yourself along, or have you looked up the process of what you're doing?

I haven't tried to remove the flywheel yet mate, after chatting with Sam the owner of the Scooter Shop near me I will have a go at getting it off this weekend - he showed me on a VBA motor they dont have an internal thread like the one on mine , he was the bloke who suggested this was a non genuine part and possibly a non genuine - Bajaj - engine ? Have also ordered a puller from Ebay so if it doesnt come off with some gentle persuasion I will hold off until the puller arrives so I dont break anything.

I dont have a manual unfortunately , hoping to sort it using the Modern Vespa brains trust

If your motor/ flywheel were in fact piaggio-made and from the correct era, you would proceed from step #3 in the attached photo. No puller needed. Just a metric socket set and a flywheel holder

Cheers zachyzach, so you are saying the engine is NOT a genuine engine or just the flywheel???

Look inside the hole for the flywheel nut. Does yours have this circlip? If it does, its self extracting. Now, it might be self extracting and the circlip is just missing. If so, see if you can clean out the hole and find the groove where the circlip should be. A picture inside would be helpful.

https://www.scootermercato.com/Scooter-Parts/Hardware/S-05981

No mate, mine has what appears to be a 28mm thread cut in it - so I have ordered one of these -
https://www.ebay.com.au/itm/404352154655?_trkparms=amclksrc%3DITM%26aid%3D1110013%26algo%3DHOMESPLICE.SIMRXI%26ao%3D1%26asc%3D20211130130958%26meid%3Dbce33158fb6c4572b0bfedccd910af95%26pid%3D101469%26rk%3D4%26rkt%3D4%26sd%3D115248194046%26itm%3D404352154655%26pmt%3D1%26noa%3D0%26pg%3D3650466%26algv%3DSimplAMLv5PairwiseWebNoToraCoCoViewsNoHighIdfOrSortByFinalScoreBlenderWithPromotedViewItems%26brand%3DUnbranded&_trksid=p3650466.c101469.m2822&amdata=cksum%3A404352154655bce33158fb6c4572b0bfedccd910af95%7Cenc%3AAQAIAAABQMpMpG5jsey2nau7193eR2bWEHaDZK2z6FIaklTOXvhztYor%252FjczxSgbXpkpZZAZEESJp%252BVJ95i4nx3IdciskewdT%252BR5GsMtqDUWRtmMA7dki1phOv8vfXDRuXozq%252Fgg3MzxWSQD7SYKlNB52D8qat%252FgWlWyWB0A7qd1IAtVS%252BUGS1eUhbIZnuDKxvTrfajah92Qpswii8E52xkc3vInCXYHAloShBeZUjvn%252FY91hRsLVaaJ0au6MZl3bCIv9YQFycDVGkJkFfEA2w4%252FQwLocP9LGW6XcNtCEX82QfnvKpYXTPqQ%252FyebXE57xGWqQ4%252FGTLDUzbjuiToAiCQZUvwDC8FDhJEJ452i97tUk62omlCIojM3x5usdh8mUCCZMO8XVJk%252FsMOcap%252FkEytERNq0n1PQSs8VYLDmOm3FRLDz721M%7Campid%3APL_CLK%7Cclp%3A3650466