Recommended spark plugs for the post 2000 Chetak from the original Bajajusa website:
Champion PL7YC (Recommended by Bajaj but tough to find)
Champion L87YC (Recommended and tested by Bajajusa)
Bosch W5BC (Recommended and tested by Bajajusa)
Bosch W5BP (Recommended and tested by Bajajusa)
NGK BP7HS. (Recommended and tested by Bajajusa) (easiest to find)
NGK BPR7HIX (NGK Iridium upgrade recommended by retrobajaj forum)
Champion PL7YC (Recommended by Bajaj but tough to find)
Champion L87YC (Recommended and tested by Bajajusa)
Bosch W5BC (Recommended and tested by Bajajusa)
Bosch W5BP (Recommended and tested by Bajajusa)
NGK BP7HS. (Recommended and tested by Bajajusa) (easiest to find)
NGK BPR7HIX (NGK Iridium upgrade recommended by retrobajaj forum)
- Thread Size: 14mm
- Reach: 12.7mm (1/2 inch)
- Hex Size: 20.6mm (13/16 inch)
- Gap: 0.7mm (.028 inch)
- Heat Range: 7