when I bought my bike it had been off the road 2 years, the previous owner bought it as a non runner, and it turned out to be the plug.
Since I have had it, it began to splutter on high revs, as if something electrical was breaking down, so i started by replacing the plug, this seemed to work for a while, but today I was out on it and it just stopped working and wouldnt restart.
Got it home, took plug out and kicked it, and no spark, put a new plu in and had spark, so replaced plug, and bike starts 1st kick.
Am I just being really unlucky with plugs?? or is something making them break down?? liike a faulty coil or something???? Any help greatly appreciated.
Hmmmm weird one, you wont be unlucky with plugs that many times in a row.
Sounds like maybe your fouling the plugs, what jetting is in the carb? What colour is the plug?
Jet is standard 240, the plug was black when I took it out. Previous to this it had been too clean, so i moved the needle position back to the origial middle, as someone had moved it all the way to the bottom, and I had put running lean down to poor running.
Is it black as in burnt or black as in covered in burnt oil?
And about changing the gap on the spark plug, i'd advise against that as the factory put them at that setting for a reason, plus i can say for sure that i've never heard anyone on here having to 'adjust' the gap on a plug on a DTR
If you do need to adjust the gap then you're gonna have to use the proper tool for it.
Carbon fouling: Dry, black sooty deposits leading to misfire and weak spark. Caused by an over-rich fuel/air mixture, faulty choke operation or blocked air filter.
If it's like the symptoms i just said then i would advise to clean the air filter as it's probably due anyway, if you've only just recently cleaned the air filter then i'm stumpted.
According to haynes the norm is: A brown, tan or grey firing end indicates that the engine is in good condition and the plug type is correct.
Although mine always seems like it's abit oily, but thats how i prefer it, i'd rather go through a dozen plugs than have any sort of seizure.
Carbon fouling: Dry, black sooty deposits leading to misfire and weak spark. Caused by an over-rich fuel/air mixture, faulty choke operation or blocked air filter.
If it's like the symptoms i just said then i would advise to clean the air filter as it's probably due anyway, if you've only just recently cleaned the air filter then i'm stumpted.
Air filter was only cleaned a few weeks back when all oils were changed.
Id guess probably needs mixture setting, but previous owner has made a right mess off it. Ive bought a new one from Yamaha, its just getting the old one out thats the problem.
May be better off just getting another carb. Is there any I can get as an upgrade if I were to change it??
