Help: Sparkplug and Cap for Vespa 90
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Hooked
GTS 300 sei giorni, LXV 125ie and V90
Joined: 11 Mar 2018
Posts: 103
Location: Eternal Spring Country/Guatemala
Tue Dec 04, 2018 11:38 am quote
Hi evryone! I searched and could not find another thread regarding this. I want to make sure I am using the correct sparkplug and need to buy a cap for a vespa 90 from 1966. SIP website shows many options and I am confused. Anyone know which one should I buy?
I am using a BP7HS and it has a brass fork but no cap, only tape.
I guess I need to replace the fork , buy a new cap and HT lead. But not sure which version to buy. Chasis is VA1T23824
Sorry for so many pictures.

E5AD7BE3-D76B-4A16-953A-49863D47E1E6.jpeg
This is how it is now, of course tape is not good enough to hold it.

FD1CDD1B-A9B4-4CB4-996C-E1C7DD8B2F03.jpeg
It has a brass fork but no sheath. Should I buy a plastic/rubberised cap?

9FF541E1-6C29-4443-8947-EA5982F7A489.jpeg
Manual indicates Bosch W240 T1 or Champion L81.

9C6A4C86-13B6-4D07-9119-15E407F19767.jpeg
Confused by so many options.

Veni, Vidi, Posti
a herd of easy shifty rats
Joined: 22 Nov 2010
Posts: 6637
Location: seattle/athens
Tue Dec 04, 2018 12:06 pm quote
You just need the rubber cover, the 2nd one on the list - #16. Your original brass connector fork looks to be in good condition but it needs the spark plug to have that little round threaded aluminum cap on top which it is designed to snap onto securely so you don't need tape to hold it on.



Use an NGK B7HS sparkplug. Notice the separate grooved cap that the brass fork snaps onto which you are missing. Also you probably know, but you are missing the plastic cylinder cover which needs to be in place for engine cooling.
Hooked
GTS 300 sei giorni, LXV 125ie and V90
Joined: 11 Mar 2018
Posts: 103
Location: Eternal Spring Country/Guatemala
Tue Dec 04, 2018 1:15 pm quote
V oodoo wrote:
You just need the rubber cover, the 2nd one on the list - #16. Your original brass connector fork looks to be in good condition but it needs the spark plug to have that little round threaded aluminum cap on top which it is designed to snap onto securely so you don't need tape to hold it on.

Use an NGK B7HS sparkplug. Notice the separate grooved cap that the brass fork snaps onto which you are missing. Also you probably know, but you are missing the plastic cylinder cover which needs to be in place for engine cooling.
Thank you! Is this correct?

B4CBA917-0897-4D06-8F51-D9A81B3CD04E.jpeg

Ossessionato
1980 P200E, 1974 Primavera, 04 Ninja 250
Joined: 04 Apr 2013
Posts: 3557
Location: San Diego, CA
Tue Dec 04, 2018 1:52 pm quote
no, screw the little bit down all the way and wrap the plug prongs around the thin bit at the middle of it.
Hooked
GTS 300 sei giorni, LXV 125ie and V90
Joined: 11 Mar 2018
Posts: 103
Location: Eternal Spring Country/Guatemala
Tue Dec 04, 2018 2:29 pm quote
sdjohn wrote:
no, screw the little bit down all the way and wrap the plug prongs around the thin bit at the middle of it.
Got it, thanks!!!
Molto Verboso
2005 PX150 In a Love-Hate Relationship with a 2-Stroke Vespa Since 2007
Joined: 01 Sep 2007
Posts: 1752

Fri Dec 07, 2018 5:07 pm quote
I donít know those early bikes, but is there no air cooling cowl?
Hooked
GTS 300 sei giorni, LXV 125ie and V90
Joined: 11 Mar 2018
Posts: 103
Location: Eternal Spring Country/Guatemala
Fri Dec 07, 2018 6:37 pm quote
pdxjim wrote:
I donít know those early bikes, but is there no air cooling cowl?
thanks to Voodoo I noticed I am missing the cowl. Will buy ir from SIP, found a plastic one.
Veni, Vidi, Posti
a herd of easy shifty rats
Joined: 22 Nov 2010
Posts: 6637
Location: seattle/athens
Fri Dec 07, 2018 7:05 pm quote
You can still gently test run it like that, even very short easy rides as long as it doesn't get too hot.
OK, now you've got this coming:

but the flywheel cover is missing here.

I hope you have this piece already.
Hooked
GS160, V50R
Joined: 11 Jun 2014
Posts: 251
Location: Ňland
Sat Dec 08, 2018 3:17 am quote
ValVitola wrote:
V oodoo wrote:
You just need the rubber cover, the 2nd one on the list - #16. Your original brass connector fork looks to be in good condition but it needs the spark plug to have that little round threaded aluminum cap on top which it is designed to snap onto securely so you don't need tape to hold it on.

Use an NGK B7HS sparkplug. Notice the separate grooved cap that the brass fork snaps onto which you are missing. Also you probably know, but you are missing the plastic cylinder cover which needs to be in place for engine cooling.
Thank you! Is this correct?
Not correct, as been explained, but actually not a bad idea in my opinion.
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