Herd
CB750 Member
Hi all, I just picked up a nice 1978 CB750K this weekend. I've had a few bikes, but this is my first Honda 4, and I think it is waaaaaaaay cool. It's bone stock at the moment, and I promise to get some pics up soon. PO said the carbs were cleaned (I don't think so), the plugs replaced (maybe...), and the battery was replaced (maybe with a used one).There was fuel mixed in with the small amount of "blacker than night oil" that was in the bike.
Anyhow, I changed the oil, cleaned the points (did not check gap yet or timing yet), and took it out for a few miles. Rode for a bit till the old gas was almost gone, and then filled it up with some fresh gas, and then rode her some more. It was running great. I found myself on an open straightway and opened her up a bit (70-80mph, maybe 5-6k rpm). As I was cruising, the engine studdered (2 separate times) like it wasn't getting fuel or spark. It lasted just for a sec, but when it happened, the bike lost power and felt like it was gonna shut down. I laid back off the throttle and everything went back to normal. I waited a bit and then pushed it some more. Sure enough, it happened one more time another couple hundred yards down the road. When I backed off and road 50-60 mph, everything was fine, and she ran as she should.
Any thoughts on how to proceed with diagnosis?
Check point gap? Check timing? Recommended reading?
Ideally, I would like to get her as reliable as possible for the season. I would love to take her on a few long rides over the next couple months.
Any thoughts on how to proceed would be greatly appreciated.
Anyhow, I changed the oil, cleaned the points (did not check gap yet or timing yet), and took it out for a few miles. Rode for a bit till the old gas was almost gone, and then filled it up with some fresh gas, and then rode her some more. It was running great. I found myself on an open straightway and opened her up a bit (70-80mph, maybe 5-6k rpm). As I was cruising, the engine studdered (2 separate times) like it wasn't getting fuel or spark. It lasted just for a sec, but when it happened, the bike lost power and felt like it was gonna shut down. I laid back off the throttle and everything went back to normal. I waited a bit and then pushed it some more. Sure enough, it happened one more time another couple hundred yards down the road. When I backed off and road 50-60 mph, everything was fine, and she ran as she should.
Any thoughts on how to proceed with diagnosis?
Check point gap? Check timing? Recommended reading?
Ideally, I would like to get her as reliable as possible for the season. I would love to take her on a few long rides over the next couple months.
Any thoughts on how to proceed would be greatly appreciated.