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Posted by drifter-paul
- September 15, 2013, 03:56:03 AMWhat petrol are you running ? 94 RON is specified , 95 is fine (easy to get (in Australia),what I use) 98 is wasted money(no improvement in performance for extra cost), don't know about 91 RON (tends to be ethanol based, and I won't touch that shit - the ethanol rather than the RON).
I use DPR6EA-9 for normal use, and DPR5EA-9 for cold weather. Normal is up to 40 C and down to 10 C, cold (for me) is below 10 Celsisus
Posted by greenbarn
- September 14, 2013, 20:44:44 PMYeah, that doesn't look like the spark plug's fault. Something else is making it run too rich. Not enough air - too much fuel. Like Troll said- PC messing up?? Plugged air filter? (it would have to be pretty clogged..)
Posted by Troll
- September 14, 2013, 18:20:04 PMLooks like it's running pretty rich, or the spark is weak. What kind of fuel mileage are you getting? There are many reasons for it to run rich, but the most common seems to be a power commander set up wrong...
Posted by zlatko83
- September 14, 2013, 14:50:28 PMProblem was spark plugs. All four are black, bad spark, jump here and there. But spark plugs are 4 month old, cca 3000km, recomended model NKG DPR6EA 9.
I was test and built in NKG DPR7EA 9. I make test drive about 150km, engine work well, without problem. But, when I check spark plug after test drive, black again.
Possible problem with burning? I also check air filter. It was 3 years old, about 14000km, but look well?
Posted by dakuhosu
- September 04, 2013, 08:19:30 AMSure strikes me as airflow. Silly question but hows the air cleaner look?
Posted by Troll
- September 04, 2013, 07:39:38 AMFuel filter is inside the tank on R models...I'd look for white marks on the inside and the outside of the spark plug caps, which would indicate spark leakage to the cylinder head, or the base of the plug.
Posted by DC
- September 04, 2013, 07:19:05 AMCheck the fuel line from the tank. There may be something intermittently clogging it.
Posted by zlatko83
- September 04, 2013, 04:04:00 AMThank you for suggestion.
The bike is year 2002 and 50.000km (about 31.000 miles).
The engine was not cold, I usually few minutes heat engine before drive.
I was chech spark plugs, it was right model and look good. I think, spark plug is not problem.
May be cable, spar plug cap??? It was factory install (11 years old).
Sutter is only under load (when I start to drive), when I rev it up (heating engine before drive), work well.
Dry or wt weather does not matter.
I must check fuel flow (vakum or fuel filter), it is possible problem. But, I must first find fuel filter 
FI lamp does not lite.
I was forget to write, it was happened first time last year, at the end of bike seazon. After service this year, work a month well, than start problem again.
Thank you for now. If you have any suggest, you are welcome. I will try to resolve problem follow your instruction and report.
regards, Zlatko
Posted by waltervl
- September 03, 2013, 04:57:53 AMI think he means it stutters when the engine is cold, during the first miles/kilometres.
Does it stutter under load or also when you rev it up without driving?
Is it in dry or wet weather? Or doesnt it matter?
You could also check your fuel flow, or perhaps your tank is sucking itself vacuum. Open up the fuel cap.
Does your FI lamp lite up on the speedometer when you have the problems? You can check for ECU faults accodring following procedure: http://www.vulcandrifterriders.com/ECUFaultCodes.html
Posted by tmassey
- September 02, 2013, 18:05:50 PMat the age of our bikes...look at the plug wires too...small cracks let moisture in....just my 2 cents.
terry
Posted by John Hopkins
- September 02, 2013, 13:14:14 PMQuote from: zlatko83 on September 02, 2013, 12:39:33 PMI may have misunderstood exactly what you are trying to explain, but I think you are saying that your bike cuts out for a second or two, then later it starts to run ok..Hello!
This summer I have problem with engine. I was made service (change oil filters, plugs,...). A month, it was work without problem. Then start tugging. Usually, when bike stay a week, or more.
I start engine, heat the engine few minutes. It work normaly, with increase hand throttle (like always). When I start to drive, the engine start to tugging (every few hunderd meters for secod or two, and then work normaly, and again)
It happen about 3-5 kilometers, than engine start to work normally.
It repeat about two month. Where is the problem?
Thank you and best regards from Slowenia
If that is correct the first thing to check is the spark plugs, take them out and look at them because you have just changed them..
Maybe you bought faulty plugs or the gaps have not been set correctly, maybe you over tightened them and cracked one, maybe the caps are loose, either on the plug or where they screw on to the HT lead, or maybe they are not fitted to the correct torque..10 ft lbs..
John.
Posted by zlatko83
- September 02, 2013, 12:39:33 PMHello!
I am new here. I am from Slowenia and I drive My drifter 1500 (FI) since 2002. Before I have drifter 800. Nice bike 
This summer I have problem with engine. I was made service (change oil filters, plugs,...). A month, it was work without problem. Then start tugging. Usually, when bike stay a week, or more.
I start engine, heat the engine few minutes. It work normaly, with increase hand throttle (like always). When I start to drive, the engine start to tugging (every few hunderd meters for secod or two, and then work normaly, and again)
It happen about 3-5 kilometers, than engine start to work normally.
It repeat about two month. Where is the problem?
Thank you and best regards from Slowenia