Jetting problem - JD / spooge / spluttering

[jocser]

Hello everyone,

I am Jochen from Belgium and I have a jetting problem that drives me crazy.
I have a 2012 EC300 which I bought last year from an international enduro pilot. They bike was in a nice condition,and hadnt run too much. He had the S3head with black insert, so massive power which was too much for me. I replaced the original compression insert.

My previous bike was a '99 EC300 with a massive torque and mega power but unfortunately everything but the engine was really worn. With this 2012 I always felt a lack of torque and "aliveness" of the engine. He also always has spooge at the muffler, checked packing and that's OK.
So 2 weeks ago I decided to rejet it, did some research and bought a JD Jetting kit, so placed the red needle in 4th clip, 180main and 40pj. He definitely has more torque but when going from low revs constantly to more throttle he really splutters for 2-3 secs and then he pulls and rev's.

He also had this problem with my previous setting in the last 2 months so I really don't know what it is.. Replaced the plug, cleaned the carb, and I use a clean filter every ride...

Any tips?: )

Thanks!

pick of my bike attached.

[barossi73]

Drop the needle to clip3,splutter is rich
As for spooge,an oil with a high flashpoint wont burn as well unless you are wide open throttle a lot.(had this with belray h1r,great protection/more spooge) also if youre rich,wont help as engine runs cooler.also qstealth endcan is worse for spooge
What needle/jets were in it before?
Sputter could be needle rich at that point,or a rich pilot that chokes you up when puttering,then when you crack throttle it blubs as it clears all the excess mix. (Drop pilot 1 size)
That said im not familiar with jd needle,so my advice is general not specific to that needle

[jocser]

Thanks, I ll drop the needle this evening and see if it works.
I have An fmf muffler fitted, and I use motul 800 ester offroad.

The pilot Jet was the same and the main was a little smaller. For what I am Reading Here, I d maybe better bought a Suzuki needle?

I also have a flywheel weight added so that might influence thing also?

Grts

[(F5)]

I have a flywheel weight and run 800, stays pretty clean, but just saying that to stop you running after red herrings. You will always get some, chase the smooth power.

[Dirt Dud]

I solved my jetting issues with a Smart Carb . I really like this modification on my bikes , in fact it is on my 200, 300, and my 250 trials bike .

[jocser]

Hello,

Because Barossi told me sputter is rich, I opted to replace the red needle with the blue on clip #2, because the JD Jetting guide says thats the following step from richer to leaner. Dropping the clip on the red needle to #3 is another step leaner.
Bike feels much better, more power and no more sputtering. Not as smooth as my good old 99, but feels really a lot better.

I rode around for a bit, not wide open throttle and in attachment you can find a pic of the spark plug. It's a little more grey/White than the pic looks like. Isn't that a sign of too lean?

PS: my previous needle was N1EF of N7EF can't read it too well, and jets pj40 and mj180.

grtz!

[stabak]

what type of carb Jochen? screw cap or bolt on top

[jocser]

Hello, enclosed a picture of my carb!

[Jakobi]

Originally Posted by jocser

Hello, enclosed a picture of my carb!

Your carb boot looks like it's hardly on the carb.. both sides.

Assume the pic was taken while you were making adjustments.

[barossi73]

How old is the plug?if its had less than a couple hrs on it and theres no other signs/sounds of lean running,id ride a bit more before assuming its lean.plugs take a while to colour true from new.avoid sustained full throttle and watch for-
Running on before settling to idle when throttle is closed
Bwooar sound when throttle is snapped open
Power flattens off noticeably when bike is hot
Clean,but thin/tinny power
On long deceleration a regular ding ding ding exhaust sound (the odd ding is acceptable)