26-06-13, 09:29 PM
Well it's still going, waiting for a load of parts to arrive for a service but I am getting a bit concerned at what it's doing now!
It starts okay now, sometimes the idle is a bit lumpy (sounds almost as though a cylinder is occasionally misfiring), but occasionally it idles fine. Riding now though I'm pretty certain it's running on 2 or possibly 3 cylinders below almost bang on 5k revs (if I open the throttle hard below that point it kinda judders up to about then, before taking off as normal once it hits the higher revs! If I'm out on a fast ride then I don't notice it at all as I don't go below about 8k, and above 5k revs it runs spot on, but around town it's a nightmare as about 3/4k is where I tend to cruise along at, and it simply doesn't accelerate at those revs at the moment. No matter what gear I'm in, if I'm below that rev range and open the throttle, it kinda "judders" (that's when it feels like a couple of cylinders are dropping out), then when the revs eventually creep up to 5k it "coughs", and takes off as normal!
Now weirdly, it doesn't do it all the time, but it has basically been doing it for the last week or so to one extent or another pretty much every time I've ridden it.
It's also going along with a strange idle, when I bought the bike the idle was rock smooth, since developing this odd problem although at idle it's sometimes smooth, it's sometimes quite visibly up and down, often accompanied by again the sound as though the bike is occasionally missing a cylinder?
So, what would it be worth looking at? It is coming up to it's 30k service imminently so I'm basically going to (as soon as I've a Haynes manual and the parts) get the service done - will be doing oil and filters, changing the coolant, balancing the carbs etc. My initial thought is that it's probably not a carb balance or fuelling issue as I would have thought that would be a permanent problem, not like the one I'm having. I also don't think that the bike could've slipped so badly out of sync just in the couple of weeks that I've owned it?
It starts okay now, sometimes the idle is a bit lumpy (sounds almost as though a cylinder is occasionally misfiring), but occasionally it idles fine. Riding now though I'm pretty certain it's running on 2 or possibly 3 cylinders below almost bang on 5k revs (if I open the throttle hard below that point it kinda judders up to about then, before taking off as normal once it hits the higher revs! If I'm out on a fast ride then I don't notice it at all as I don't go below about 8k, and above 5k revs it runs spot on, but around town it's a nightmare as about 3/4k is where I tend to cruise along at, and it simply doesn't accelerate at those revs at the moment. No matter what gear I'm in, if I'm below that rev range and open the throttle, it kinda "judders" (that's when it feels like a couple of cylinders are dropping out), then when the revs eventually creep up to 5k it "coughs", and takes off as normal!
Now weirdly, it doesn't do it all the time, but it has basically been doing it for the last week or so to one extent or another pretty much every time I've ridden it.
It's also going along with a strange idle, when I bought the bike the idle was rock smooth, since developing this odd problem although at idle it's sometimes smooth, it's sometimes quite visibly up and down, often accompanied by again the sound as though the bike is occasionally missing a cylinder?
So, what would it be worth looking at? It is coming up to it's 30k service imminently so I'm basically going to (as soon as I've a Haynes manual and the parts) get the service done - will be doing oil and filters, changing the coolant, balancing the carbs etc. My initial thought is that it's probably not a carb balance or fuelling issue as I would have thought that would be a permanent problem, not like the one I'm having. I also don't think that the bike could've slipped so badly out of sync just in the couple of weeks that I've owned it?