I do get crazy I can't get the bike to run lean

[Larsa]

2018 GP300 sea level in Stockholm Sweden.
99 Octane it is Sweden so it is not the same as USA RON it is lower.
2% 50:1 Motul 800 Full Synthetic
20 Celsius 68F and a little rain
Needle NEDW#1 at the top, Main jet 168 Pilot jet 40 AS 2 turns out.
Float lever 2mm lower then org. Sparkplug denso W24EsR-u
First I did run 30 minutes then I did clean silencer. Then I did run for 15 minutes and took this pictures.
This track is not so fast and it is gravel and sand average speed 27km/h 16,8mph and am not so fast driver.

I have tested all I can think of.
If I run PJ 38 I do can feel that the engine is to lean. But still drops from the silencer.
I have tested needle N2ZW at #2 still drops.
I have lower the compression by adding two extra cylinder foot gasket .15 and .50 + org .30
That because it was pining when using NEDW#2 and PJ40 MJ175 but still dropping from the silencer.

[gg3]

Hi Larsa,
Don't jet by muffler spooge it will drive you insane.It indicates poor combustion efficiency rather than jetting.
Have a quick look at your plug colour to get a general indication.If it is dark & oily there is some other issue.
My 2018 XC300 is running 175,NEDW#3,40 pilot,temp 20 degrees ,elevation 0-500m. So your jetting should be ok.
I always had oil dribbling onto the swingarm until I did the head squish.Now runs clean & heaps of other advantages.

[SS109]

Yeah, I agree with gg3. Plus, adding more base gaskets to lower your compression just killed your head squish and changed your port timing. Proper squish and the highest compression for the fuel you run leads to higher efficiency which leads to less spooge.

[Jakobi]

My 2018 has had the head setup. Still spooges a fair whack. I'll get a similar amount to the pic in the original post, but it takes me around 70kms of mostly single with a few transport sections to get it like that.

Remember the packing will also be quite soaked and any changes to jetting could take a while to clear out as well.

[Larsa]

What can I then do? On my GP300-18 it was as org one .3 gasket. And all older GasGas 300 that I have hade did have 3 gaskets .15 .30 and .5 The highest octane you can get in Sweden is 99 octane that is about the same as USA 93.
When I was using only the .3 gasket the engine started to ping when I did used NEDW #2 and PJ 40. The pinging is gone now.
What is your recommendations.

[gg3]

The Motul 800 won't be helping if slow riding.Change to Motul 700.
As Jacobi said,repack muffler as it will be full of oil.
.5mm gasket.
Air filter is clean & not over oiled I guess?
New plug NGK BR8EG
Take it for a good spin so it is at full operating temperature.
Post a photo of the plug.
How does it actually run? Does it sound rich or lean? throttle responsive or not?

[(F5)]

Spooge or the plug aren't jetting tools. A bike could be dangerous lean at one throttle position and rich at another for example and those 2 things could badly lead you astray.

I do agree a tight squish is worth achieving. I run about 1mm. But, and it is a BigButt (& I cannot lie. . . sorry) you must reduce the compression ratio back down to what your gas can cope with. Presumably what you are running now.

Read my head thread, it rambles a bit but gets there in the end.


http://www.gasgasrider.org/forum/sho...highlight=Head

[Larsa]

I will read more later many thanks to you all. The spark plug looks almost perfect.
It is the org spark plug Denso W24ESR-U Now I have changed spark plug and put in an NGK B8EG.
I am thinking that a BR7EG can make it better?