Hi All,
Sorry that my first post here has to be a wanting help one, but I'm afraid I have completely run out of ideas with this. I've had my bike almost 6 years now and I've worked on it an awful lot, but it's still stock, everything I have done has been maintenance related. I commute around 40 miles a day on it to give an idea of use. It has 44000 miles on the clock
So about a year back I notice the bike is bogging intermittently, which is a huge pain because every time I would be ready to diagnose the thing it would run fine for a few days, but when I'd be out on the roads and open it up, it would bog awfully, felt like a 125 when it did.
Now, in addition to this it appears to be dropping a cylinder or two on idle, which is a consistent problem now, its fine when started up (I always need choke to start it now - didn't use to), but as soon as it's warm, it starts this ticking noise, and dropping a cylinder I'm assuming (here's a video I'm hoping will help understand what's happening, this is after a 20 or so mile ride ).
So here's what I've done so far -
--rebuilt carbs, including all new gaskets and jets, but I didn't touch the pilot jets and thoroughly cleaned them - I've rebuilt carbs a fair few times before so I would be surprised if there's an awful error in my rebuilding, but who knows.
--New air filter, checked all sealing between intake manifold, carbs and airbox
--new spark plugs, and checked that all the spark plugs spark and look healthy when removed and earther against the frame (admittedly I only did this for a few seconds, perhaps I could be missing a problem that only happens only every 30 seconds or so. (Also no noticeable fouling of a particular plug during any of the times I have taken them out during the time I've had this problem)
--New fuel filter, and checked for any kinking of the fuel line
--balanced carbs, and checked all the vacuum lines are on properly and blanked off where needed
-- removed head and checked all valve clearances (some seemed a little tight if anything - none were badly out of spec)
Now I can't for the life of me work out if the bogging was too rich or too lean, I've tried using a tiny bit of choke when I noticed it was really bad, but I can't say I could tell there was a difference to be honest, and too much choke wants to flood the engine like I'd expect.
Last thing to mention is the bike is restricted via blanking plates (Since I bought it) which restrict the amount of fuel air into the intake, however I am fairly certain that the bike didn't bog for a number of years with these, and definitely has been able to idle reasonably with them, I am loathe to blame them.
Maybe it's an electrical problem - alternator/ spark generator related? Where would I start with diagnosing this?
Anyway thank you so much for any help you might be able to give, I really do appreciate it.
Sorry that my first post here has to be a wanting help one, but I'm afraid I have completely run out of ideas with this. I've had my bike almost 6 years now and I've worked on it an awful lot, but it's still stock, everything I have done has been maintenance related. I commute around 40 miles a day on it to give an idea of use. It has 44000 miles on the clock
So about a year back I notice the bike is bogging intermittently, which is a huge pain because every time I would be ready to diagnose the thing it would run fine for a few days, but when I'd be out on the roads and open it up, it would bog awfully, felt like a 125 when it did.
Now, in addition to this it appears to be dropping a cylinder or two on idle, which is a consistent problem now, its fine when started up (I always need choke to start it now - didn't use to), but as soon as it's warm, it starts this ticking noise, and dropping a cylinder I'm assuming (here's a video I'm hoping will help understand what's happening, this is after a 20 or so mile ride ).
So here's what I've done so far -
--rebuilt carbs, including all new gaskets and jets, but I didn't touch the pilot jets and thoroughly cleaned them - I've rebuilt carbs a fair few times before so I would be surprised if there's an awful error in my rebuilding, but who knows.
--New air filter, checked all sealing between intake manifold, carbs and airbox
--new spark plugs, and checked that all the spark plugs spark and look healthy when removed and earther against the frame (admittedly I only did this for a few seconds, perhaps I could be missing a problem that only happens only every 30 seconds or so. (Also no noticeable fouling of a particular plug during any of the times I have taken them out during the time I've had this problem)
--New fuel filter, and checked for any kinking of the fuel line
--balanced carbs, and checked all the vacuum lines are on properly and blanked off where needed
-- removed head and checked all valve clearances (some seemed a little tight if anything - none were badly out of spec)
Now I can't for the life of me work out if the bogging was too rich or too lean, I've tried using a tiny bit of choke when I noticed it was really bad, but I can't say I could tell there was a difference to be honest, and too much choke wants to flood the engine like I'd expect.
Last thing to mention is the bike is restricted via blanking plates (Since I bought it) which restrict the amount of fuel air into the intake, however I am fairly certain that the bike didn't bog for a number of years with these, and definitely has been able to idle reasonably with them, I am loathe to blame them.
Maybe it's an electrical problem - alternator/ spark generator related? Where would I start with diagnosing this?
Anyway thank you so much for any help you might be able to give, I really do appreciate it.
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