EC250R 2012 high RPM issue

[Jim Cook]

Originally Posted by blamir

Hello guys,

Today i changed iddle with 32 to 38, could not find 40. It is much better than 32. Air mixture still open 1 and half turnout.

Tried full throttle and i see plug could not ignition after 3 seconds on top rev. My bike was not geting top revs before. It takes top revs right now but started passing ingition after a few seconds.
It makes only at 1st gear not 2 or 3rd.

This is not problem for me. I am not going with full throttle all time. I wonder is this normal response.

Edit: Today KTM dealer said me that, gasgas 2t engine is honda cr250 engine so it's fuel consiption is so high. Is that true? and yz and cr needles is not suitable for gasgas. Anyway i ordered the needles. My bike come back to life with your offers.

Don't listen to the KTM dealer. He obviously has not done his homework.
For full throttle runs (down a long straight or a road for longer than 8 seconds), you are going to need at least the 175 main jet to protect your engine; and for sustained full throttle runs, you can probably use a 178 main jet.

The GasGas engine was originally designed by combining aspects of the CR250 and the TM250 engines. Then, they refined the porting and powervavle specifications to give the power delivery that they desired. I like being able to use a CR250 connecting rod kit and piston kit. We have bored the 250 cylinder 3mm to 69.5mm (also recoated the cylinder bore with nikasil and built up the head to match the cylinder bore) so that we could run the 14th oversize Wiseco piston for a Honda TRX250R racing quad. This also made necessary the "shaving" of the powervalve "flapper". It gave us a 274cc displacement. I ran one for 5 years on a '98 counterbalanced engine. It was great. It had more torque than the 250cc, but still felt like a 250 instead of a 300 as I raced between the trees in tight woods trails.


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[blamir]

178MJ fouls plug after 2 or 3 riding. N1EF needle a bit rich. 172 looks fine with this needle. Tomorrow i am going to post a video from Istanbul forests

Cheers

[Jakobi]

The main won't cause the plug to fowl over time. A rich main will just break up and burble when opening WOT.

The issue with the stock setup is the needle diameter and rich first taper. Everything else you do to try and work around and resolve this is just a bandaid (smaller pilot, raising clip position, smaller mains). They may improve the small throttle loading, but as you have experienced already, cause other issues elsewhere.

[blamir]

Hello guys,

Today i rode gasgassss and i can say that it is more agressive than old settings. I failed two times stupidly. Power is not rising balenced. Bike gets away under my ass suddenly . Pipe was not oiled much as before. I liked it.

I am waiting for suzuki and yamaha needle. i wonder how they will change ride capability.

Here is gasgas fail What is my mistake .
http://www.youtube.com/watch?v=xhlnWa-6Uk8

[gasmonkey]

You fail cause you ride like old lady.N1EF sounds like crap.Put suzuki needle soon as possible in and change of ride capability will go up.

[desertgasser300]

My 300 loves the JD red needle. My 250 likes the JD blue. Setting the float height was key to getting both bikes tuned properly.

[Jim Cook]

Originally Posted by blamir

178MJ fouls plug after 2 or 3 riding. N1EF needle a bit rich. 172 looks fine with this needle. Tomorrow i am going to post a video from Istanbul forests

Cheers

Was that the video you promised? Where are the trees?

It will get better when you put one of the new jet needles in.
When climbing hills, remember, "Momentum is your friend."

Good Riding and thanks for the video.
Jim



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[Elvis74]

By the way, KTM has a 36mm and GasGas a 38mm carb. That's one reason for the different jetting between the brands.

[Jim Cook]

Originally Posted by Elvis74

By the way, KTM has a 36mm and GasGas a 38mm carb. That's one reason for the different jetting between the brands.

Speaking of this:
Once at the shop, a friend brought in a '99 GasGas he had bought for me to fix his "throttle sticking" problem.

The previous owner had iinstalled a KTM jet needle, which was too short. When I "whacked open" the throttle firmly, the needle could come out of the needle jet and stick, and the bike would be stuck on "WFO".

If anyone uses a KTM spec needle, make sure it's long enough to not cause this problem.

[blamir]

Originally Posted by Jim Cook

Was that the video you promised? Where are the trees?

It will get better when you put one of the new jet needles in.
When climbing hills, remember, "Momentum is your friend."

Good Riding and thanks for the video.
Jim



.

Hello Jim,

I had some problem with video encoding. I am adding a video.

It was a slow ride
http://www.youtube.com/watch?v=0xBMoWex1NY

Edit: What is the size of BOTTOM STEERING NUT?