The VVC engine on my '92 VVC bandit appears to have developed a small problem.
When I go to roll on the power, sometimes the engine responds, and sometimes it doesn't. This can happen at any point in the rev range. It can also drop down a couple of K with no warning, or 'stick' at a certain maximum rev point no matter how frantically you twist (it will rev hard and clean if I pull the clutch in when it is doing this, but gets temperamental again if I let the clutch out).
It revs cleanly all the way up to redline when the engine is in neutral. It only displays this problem under load (in gear).
This problem occurs frequently (every couple of minutes when riding). The engine will stay 'stuck' for up to half a minute, and then 'unstick' suddenly, revving up hard with a huge burst of power with no warning, and flinging the bike down the road with me hanging on for dear life and trying not to run into the back of the car in front.
I was thinking that maybe the carb inlet slide might be intermittently sticking (holds at a certain rev point, then suddenly opens up when it unsticks and sucks in more air, revving hard and flinging the bike forward).
However, that doesn't really square up with the clean revving under no load conditions. Does that make sense or am I talking rubbish? I would be inclined to think it's a dodgy throttle cable or carb slide, but simply because it revs clean in neutral, I'm thinking that the problem might lie elsewhere.
So, I've read a lot on this board about dodgy and temperamental CDI units.
Is this the sort of thing that could be attributed to a malfunctioning CDI? Has anyone had anything similar happen to them?
Topic: VVC engine 'stuttering'. Help needed on the diagnosis (Read 2395 times)