spark plug gap

Hi, What is the spark plug gap on a 1979 390 cr? I have setting it at .023 ,The plug is ngk B8ES. Thanks Doug.

Hi Doug,

According to the NGK website is the gap 0.8mm (.032").

I had a 79 390 CR and my notes say .024

So i would stay in the .023-.024 range as the Motoplats are not known for a strong spark so a tighter gap will work best

I went down to .018 with a B8EG-fine wire nickle. Starts alot easier and reduces tendency to foul at idle. Harry Taylor suggested I try that because it takes some load off of the coil and it advances the spark timing slightly to compensate for weak generation in old Motoplat like HighDez said.

Harry Taylor has been racing/building bikes since the early fifties. He was Hodaka's R-D man, he won the 1968 Daytona road race 100cc class on a 90cc Hodaka he hand built. He started out in the Yakima Washington area and had built Jim Pomeroy's first race bike-Yamaguchi. Later after Hodaka he was R-D guy for starting Line Products. His specialty is porting, engine building and pipes. He turned 75 last summer during Hodaka days which is in Athena Oregon, population 1000 about ten minutes north of me. I wish I had known him before he retired from SLP, he had a dyno trailer at his home for testing his porting and pipes. He raced vintage MX untill two years ago, heart problems. My best friend owns his former YZ175 bike- it will eat my 82-430XC, unbelievable power. He is a good friend and a great information resource. He is going to teach me how to build a pipe for my 430 this winter and I will very much value that time spent.

Hey make two pipes and i will by one.1 1/4 " stinger please