Dudes

Help needed
My k100 is got a "cough" in the rev range :/

So far I've checked all spark plugs and they are fine also ht leads

New fuel filter and good battery
New fuel lines.
Still there tho!
Getting small flames out the pipes on all four

thumperslaw wrote:Dudes

Help needed
My k100 is got a "cough" in the rev range :/

So far I've checked all spark plugs and they are fine also ht leads

New fuel filter and good battery
New fuel lines.
Still there tho!
Getting small flames out the pipes on all four

Could it be the timing needs adjusting slightly ?

Seem fine for the last 1500 miles and then it started acting up and not charging. I've since sorted charging up this miss fire is getting right on my you no what.

what rev range is it playing up at ?

You say checked plugs but have you replaced them as a low battery can cause plugs to foul and never recover.

Not got the standard clocks no more
But 55mph in 5 gear it's doing it then.

Checked the gap on the plugs and they where spot on
I've not replace them yet tho

What is a good plugs to go for? I've got nkg d8 at the moment

D7EA
Not 16v?
D7EA

yay. think I got one right

Just looked and it's got d8ea nkg

It's k100 lt 8v

I know you have been here for a while but it is a good memory jogger to have a look at THIS page.
So you just bought a K. And thought I had better check it and it says nothing about the plugs.
NGK D7EA are teh ones you want.
Make sure they have the stud on top.

thumperslaw wrote:Not got the standard clocks no more
But 55mph in 5 gear it's doing it then.

Checked the gap on the plugs and they where spot on
I've not replace them yet tho

What is a good plugs to go for? I've got nkg d8 at the moment

Only at that speed or coughing from that speed upwards ?

Seem to recall a recent thread about having to connect certain wires together when you remove the original clocks or you may get charging problems(?)
Too lazy to find it for you.

Got nothing to do with clocks
Been running spot on for 1500 miles and not one fault.

It's coughing when in idle and you rev it say 1/4 throttle then it starts doing it.

Changed plugs and still the same and also air flow meter with no joy

does it run with the choke on ok ?

and are you running without the TPS disconected

Tps got set tonight and is all plugge in.
Not tried the choke on yet.

Doing my head in lol. Chasing the around and around

unplug the TPS

Will try that next.


Also my pipes are very very short.
And when I give it some there is yellow flames (very small) comin out. Never has it done it before

if it was a gas torch yellow flame would be a non efficient flame sooty but if it was a blue flame then that would be hotter . .do you think its getting to much fuel and not burning it off properly ? and the plugs are deffo not black and sooty/wet ?

What you need is someone that works on jet engines to tell you about flames and efficency . . look what comes out of a jet on afterbuner its like blue pure hot burned gas with no sooty smoke

maybe because you got them fancy pipes you need a colder set of plugs someone here will tell you the direction to go dont take my word for it but i think it would be a step down to a "7"

Right after long day at my workshop I've done the following

Swapped plugs,coil pack,leads
Fuel injection rail and injectors
Cdi box and injector box
Air flow meter
Tps

Still no joy :/

Work through the troubleshooting ladder diagram and also check your fuel pressure.
Regards,
K-BIKE

Could also be a idea to check the water temp sensor.

Measure the resistance between contact #10 & 13 at the Jetronic
multiconnector and compare with the temp/resistance chart in the
troubleshooting diagram at the portal.

For multiconnector numbering, look at reply 13 in this link.

The ingition thing (at the front of the engine) is that in a oil bath?

No it's dry

Well it wasn't that!

Next....

Sticking cam bucket ?

That's next

So I've still not got this sorted

I'll roll off what I've done.

Exhaust
Full loom
Leak down test
Compression check
Temp sensor
Fuel pump
Fuel filter
Switch
Battery
Fuel injection system
Fuel lines
Air flow meter
Air box
Air filter
Balanced throttle bodies

What next

Long shot. Someone on the forum had a problem with a slight hesitation.
Turned out to be some metal swarf behind the 'T' shaped cover on the front of the engine where the ignition trigger lives.
Might be worth checking the if ignition timing while you are there, if you haven't done that already.

Changed the ignition thingy got changed

Coils
Plugs
Ht leads
Caps
All changed

Also check tps is set right

how about throttle body rubbers
are there cracks in them ?

it can be hard to see this in any case ....the tell tale is a slight weeping around them

Have you checked the whole intake system for air leaks including the crankcase breather system?

Checked all of them
No leaks
Crank case breather pipe is brand new

What I am thinking is leaks in the actual crankcase not just at the breather.
Remove the oil filler cap and see if it falters or even stalls. If there is a leak the ingoing air will prevent most of the tell tale oil leak that can occur.

Try this; have the bike running and open up the crank case filler plug. If the engine running doesn't change you've got a good air leak somewhere. With all the work you've done is the elbow between the air-filter housing and the plenum properly seated/sealed?

Had the cam cover off last night and checked every thing

It seems to have jumped a tooth on the cam chain :/

Was there ever a problem with the tensioner going weak?

If it has jumped a tooth then the chain has to be worn as well as tensioner problems. I would recommend replacing all the bits including the hydraulic piston as next time it might go a few more and destroy an engine.

Did you check voltage and connections TO coils?