Help: Sparkplug and Cap for Vespa 90
Post Reply    Forum -> Not-So-Modern
Author Message
Hooked
2018 GTV300 sei giorni, 2012 LXV 125ie and V90
Joined: 11 Mar 2018
Posts: 215
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: 6726
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
2018 GTV300 sei giorni, 2012 LXV 125ie and V90
Joined: 11 Mar 2018
Posts: 215
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: 3669
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
2018 GTV300 sei giorni, 2012 LXV 125ie and V90
Joined: 11 Mar 2018
Posts: 215
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: 1769

Fri Dec 07, 2018 5:07 pm quote
I donít know those early bikes, but is there no air cooling cowl?
Hooked
2018 GTV300 sei giorni, 2012 LXV 125ie and V90
Joined: 11 Mar 2018
Posts: 215
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: 6726
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: 260
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.
Hooked
2018 GTV300 sei giorni, 2012 LXV 125ie and V90
Joined: 11 Mar 2018
Posts: 215
Location: Eternal Spring Country/Guatemala
Sat May 18, 2019 12:47 pm quote
Help! I continue to struggle with starting it.... I replaced the sparkplug fork, made sure the metal cap of the sparkplug is tight, put the fork around the metal cap, bought the rubber cap. Am I doing something wrong? I am so frustrated... by the way, bought the plastic cylinder cowl and was a bit too big so had to cut a larger hole...

74B95844-DA6D-4906-9B02-C8CC35048189.jpeg

8A5BFD18-5A7C-4ADB-BDD0-91B529B68F1D.jpeg



Last edited by ValVitola on Sat May 18, 2019 12:52 pm; edited 1 time in total
Hooked
2018 GTV300 sei giorni, 2012 LXV 125ie and V90
Joined: 11 Mar 2018
Posts: 215
Location: Eternal Spring Country/Guatemala
Sat May 18, 2019 12:51 pm quote
Here some other pics.

8ECC28B4-0308-4DEE-AA0A-1300EA4244EE.jpeg

B1796F2B-6868-47C3-9A5E-495BF41F29E8.jpeg

Hooked
Honda elite
Joined: 19 Jun 2007
Posts: 378
Location: California
Sat May 18, 2019 12:59 pm quote
have you tested for spark? Remove the spark plug, connect it back to the wire, hold the insulation and ground the plug metal against the metal on scooter and kick. Look for blue spark on plug.

As you probably know the cylinder cover looks incorrect for that model and I think the small frame just uses a hard plastic 90 degree spark plug connector could be wrong about that

nice color by the way hope you get it running quickly
Hooked
2018 GTV300 sei giorni, 2012 LXV 125ie and V90
Joined: 11 Mar 2018
Posts: 215
Location: Eternal Spring Country/Guatemala
Sat May 18, 2019 1:12 pm quote
hibbert wrote:
have you tested for spark? Remove the spark plug, connect it back to the wire, hold the insulation and ground the plug metal against the metal on scooter and kick. Look for blue spark on plug.

As you probably know the cylinder cover looks incorrect for that model and I think the small frame just uses a hard plastic 90 degree spark plug connector could be wrong about that

nice color by the way hope you get it running quickly
Yes, I got a blue spark when testing... I will buy a 90 degree connector to see if it works.

Yes the cylinder cover is not the correct one, I have not yet been able to find the right one...
Hooked
Honda elite
Joined: 19 Jun 2007
Posts: 378
Location: California
Sat May 18, 2019 1:56 pm quote
My Primavera used a plug cap like the last one on your Dec 4 post.
Ossessionato
1976 Super (x 2), 1974 Primavera (x 2), 2006 Fly 150
Joined: 26 Sep 2013
Posts: 4511
Location: So Cal
Sat May 18, 2019 3:16 pm quote
No need to get a different connector. The one you have is fine. You have spark.

Is the tap on? Is gas flowing to the carb?

Spray some starting fluid down the sparkplug hole. It should fire.
Hooked
2018 GTV300 sei giorni, 2012 LXV 125ie and V90
Joined: 11 Mar 2018
Posts: 215
Location: Eternal Spring Country/Guatemala
Sat May 18, 2019 3:56 pm quote
SoCalGuy wrote:
Is the tap on? Is gas flowing to the carb?

Spray some starting fluid down the sparkplug hole. It should fire.
Thank you! How can I check if gas is flowing to the carb?
Ossessionato
1976 Super (x 2), 1974 Primavera (x 2), 2006 Fly 150
Joined: 26 Sep 2013
Posts: 4511
Location: So Cal
Sat May 18, 2019 4:02 pm quote
Lift out the tank, pull the fuel line off the carb, and turn the tap on. Make sure you have gas (2% premix) in the tank, obviously.
Hooked
2018 GTV300 sei giorni, 2012 LXV 125ie and V90
Joined: 11 Mar 2018
Posts: 215
Location: Eternal Spring Country/Guatemala
Sun May 19, 2019 4:43 am quote
SoCalGuy wrote:
Lift out the tank, pull the fuel line off the carb, and turn the tap on. Make sure you have gas (2% premix) in the tank, obviously.
Thank you, will try that Today, I do have gas (2% premix)
Land of 10,000 Scoots Rally   vespa scooterwest scooter west Motorsport Scooters   Cool Ass scooter seat cover
Post Reply    Forum -> Not-So-Modern
[ Time: 0.4538s ][ Queries: 25 (0.0525s) ][ Debug on ]