Spark Plug replacement on the 1967 Vespa Sprint

Spark Plug replacement

Yikes! talk about a pain to choose seems there are a billion different options here

Plugs I pulled from the Bikes were:

• Red - NGK BP6ES
• Blue - Champion J8C

I also Noted that the box the bikes came with had a

• Bosch Platinum WR8DP Plug 

The following I found online didn't work

Online I found a site that recommends the following

• NGK B8HS ( High Speed and High Heat operation)

• NGK B7HS (Lower Speed and Lower Heat)

The Vespa Manual

According to the Manual I found online

Spark Advance: 22 Deg + or - 1 Deg before TDC

Plug Types

• Marelli CW 225 N-T AC 43 F
• Champion L86
• Bosch W225 T1
• KLG F70 or F75

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In the end I used Champion J8C

• Type: HI-PERF.
• Type: MARINE
• Thread size: 14mm (0.55118 inches)
• Hex size: 0,81 inches (20.574 mm)
• Reach: 0,38 inches (9.652 mm)
• Seat type: GASKET
• Projected tip: NO

Here is the Cross reference spark plug list for the Champion P/N J8C

Possible spark plugs:

• NGK: B4
• NGK: B6S
• NGK: BR6S
• Accel: 124
• AC Delco: 45
• AC Delco: M45
• AC Delco: 44,M44C
• AC Delco: M44C
• AC Delco: R44
• Autolite: 295
• Autolite: 356
• Autolite: 366
• Autolite: 294
• Autolite: 355
• Autolite: 315
• Bosch: WR9EC
• Bosch: W9EC0
• Bosch: WR8EC
• Champion: J8C
• Denso: W14-U
• Denso: W16S-U
• Denso: W20SR-U
• Lodge: BAN
• Mopar: 4339491
• Motorcraft: AS8
• Motorcraft: A7CX
• Motorcraft: AS4C
• Napa: X502
• Napa: X501
• Napa: X900
• Prestolite: 14-07-01
• Prestolite: 14-7X
• Prestolite: 14-9X
• Prestolite: 14-5X
• Prestolite: 14-03-01
• Splitfire: SM029E
• Valley Forge: 447

here is a good link to find Alternatives
http://www.sparkplug-crossreference.com/