Hey, i recently acquired a duke 690 2015, quite cheaply i might add. I am technically enclined. but have mostly worked on diesel engines. and i am not very familiar with ktm fuel injection systems.
About the bike:
symtoms are:
so far i have checked:
Everything mechanical seems to be in order wich is why i will now start measuring sensor values with an oscillioscope.
any tip for other things that should be checked is much apriciated.
About the bike:
- 10 000 km in odometer
- is restrickted to 44 kph
- lives in norway ( so he is usually freezing)
symtoms are:
- will not start without applying a small amount of throttle
- will not run at a fixed rpm when cold, does not matter if it is 2000rpm or 6000. just starts missfireing and dies. (gets better when warm, but still a lot of missfiering)
- can be driven, but missfires all the time, very difficult to make it yield full power.
- will not run at idle (hot or cold) idle rpm seems to bee to low to be sustained.
- too keep the engine running constant large adjustment to throttle use is required.
so far i have checked:
- fuel quality ( dranied tank, washed it and replaced fuel)
- fuel pump and regulator ( tested in a bath of gasoline, seems to be suppluing an adequate amount of fuel. thoug not pressure tested)
- Fuel filters (cleaned and flow tested)
- Fuel injector (backflushed and tested in open air, has a nice and even spray)
- Throttle valve (seems to be working to spec. opens to full when engine is running. no un-even movements)
- Rocker arms and valve clearances (all within spec)
- Air filter ( ok )
- spark plugs (replaced with new ones)
- coils (not sure how to test these, but they both measure 1,4 ohms. and visually checked spark while running the starter motor. both plugs fire at the same time)
- muffler (tried removing it incase of backpressure. only made it worse)
Everything mechanical seems to be in order wich is why i will now start measuring sensor values with an oscillioscope.
any tip for other things that should be checked is much apriciated.