johnpclynch
Well-Known Member
I think it's an electrical problem, I've checked the basics but the problem still exists... here goes
My VMax has been running sweet for months now without any major problems. About 10 days ago the engine started coughing while I was driving to work, it happened to be the morning of the coldest day I can remember so I put it down to carb icing or some cold related problem. Later that day the bike wouldn't start so I went off, charged the battery & cleaned the plugs (they were pretty dirty) The bike started no problem and I drove home but on the way it started coughing again... :damn angry:
2 days later - new battery (Vmax Battery replacement 101 http://www.vmaxforum.net/showthread.php?t=113), plugs, HT cables, carbs, fuel additive (and a look over every connector on the bike) and the problem is still there :ummm:
The bike starts without a problem, runs fine with the choke on. I go for a drive and it takes about 5 minutes before it starts misfiring. Under acceleration there is no problem, only when idling/cruising. I tried unplugging each plug individually to see if a coil is blown but the engine revs always drop.
Q: ANYBODY have any clue as to what it might be? Could it be mechanical, head gasket/valves/oil pump etc?
PS: I had the carbs & new battery waiting to fit as part of a spring revamp when the weather improved. Regulator/rectifier was beefed up in November & I have an old CDI lying around that I'm going to try during the week
My VMax has been running sweet for months now without any major problems. About 10 days ago the engine started coughing while I was driving to work, it happened to be the morning of the coldest day I can remember so I put it down to carb icing or some cold related problem. Later that day the bike wouldn't start so I went off, charged the battery & cleaned the plugs (they were pretty dirty) The bike started no problem and I drove home but on the way it started coughing again... :damn angry:
2 days later - new battery (Vmax Battery replacement 101 http://www.vmaxforum.net/showthread.php?t=113), plugs, HT cables, carbs, fuel additive (and a look over every connector on the bike) and the problem is still there :ummm:
The bike starts without a problem, runs fine with the choke on. I go for a drive and it takes about 5 minutes before it starts misfiring. Under acceleration there is no problem, only when idling/cruising. I tried unplugging each plug individually to see if a coil is blown but the engine revs always drop.
Q: ANYBODY have any clue as to what it might be? Could it be mechanical, head gasket/valves/oil pump etc?
PS: I had the carbs & new battery waiting to fit as part of a spring revamp when the weather improved. Regulator/rectifier was beefed up in November & I have an old CDI lying around that I'm going to try during the week