Ngk Recent Questions, Troubleshooting Help & Support

Looking at the front of the engine (pulleys and belts end), cylinders 1-3-5 are on the right side.

.025 plug gap.

0.7 mm

Try NGK BPR6HS

Remove top cover off motor to gain acess

Need some more Data too tell me what kind what model do it when it,s cold not hot cause you will strip it for sure

Electrode gap 0.9mm

The cross reference to the ac deco spark plug 41-993 to a ngk plug is PTR4G15.

Yamaha 94702-00418 Yamaha 94709-00418

.7 thouants

no br4hs = R5671A-9 autolite

Don't know if my last post went up, so here it is agian. The firing order is: 1-2-3-4-5-6 The cylinders are numbered from the front of the engine to the rear, the front cylinder bank (closest to the radiator) are 2-4-6 and the rear bank near firewall is: 1-3-5 Your coil should be marked with small cylinder #s, just connect the correct spark plug wire to that cylinder.

Hope this helps

0.039 to 0.043 in. V/6 and 4 cylinder are the same Gap. hope this helps

what year? yamaha 1982 50 uses bp4hs

Me too looking for the same............

1mm

Try google

The coil is with 4 out put 1 to cylinder 1 2 to cylinder 4 3 to cylinder 2 4 to cylinder 3