ec 250 float heights?????

[twibs]

hi all,
anyone point me in the right direction with fuel problems on uk ec250. Has been running fine till recently, just coincedence it got little colder and problems started i think.

when going down longish descents or using very little throttle for long periods the plug fouls up ,also had trouble with fuel leaking from bowl overflow when engine off and bike on side stand so guessing these two related to float height ,but it also ran out of fuel in carb during fast road section .
could it be that this too is also float height problem? is it worth fitting new float valve,(number 8 on parts diagram ) and reseting float height to 17mm?? or would 16mm be better?

thanks in advance

also cheers mods for quick posting problem !

[widebear]

It might be worthwhile to check the two tabs on the carb body that support the float pivot pin. They can become ovaled and enlarged from vibration making it extremly. difficult to set the float height correctly

[twibs]

ok sorted the float height problem out when i had it to bits to clean carb out had forgotten to clip the float valve spring over float tab !!!!

hopefully a quick jetting question, running on the following sizes was wondering if the colder weather could cause problem with plug wetting on lower throttle positions and how to go about sorting it ,or is it just a simple case of adjusting air screw out to lean mixture off? realise most of you guys in usa and our cold aint same as your cold!

38 pilot
180 main
7 slide
n1ef middle clip

[Leon_gasgas]

Hi!

Here in Finland with temps around 0 C this jetting is lean (at least for the 07 EC250 which, as Glenn wrote, it requires much bigger jets than older models). First I went to 45 pilot with air screw at 1-1.5 turns out. Just yesterday moved the needle (N1EF) clip to 4th position from top improving the low-mid response and torque but still I got pinging/detonation/loss of power when I tried to use full power once, with the 180 main jet. Today I will go straight to an 190 and test on the weekend. At least to go rich to get rid off the pinging.

[GMP]

If you guys in Europe/UK can get some of the other needles mentioned you should try them. I know Les has sold kits in Europe, contact him for a distributor. The JD Blue is good and the CCK Keihin needle has a good rep as well, about to try that myself in a 250 Husky w/Keihin conversion.

[Leon_gasgas]

Hi!

I think I arrived to a good jetting spec for the 07 EC250 for winter in Finland. I have to add that we add about 1% of ethanol liquid (plus 2% oil...) to help the petrol and the carb boot not to freeze (actually the moisture in the air channel not to become ice... I hope you understand me). For this we use also sleeping bag bases to cover the carb from snow, ice and cold air and to guide warm air from the cylinder to the carb.

Pilot: 45
Air screw 1,5 turns out,
Needle N1EF, clip #4 from top
Slide 7
Main Jet: 190

It's a completely new bike now with torque and power everywhere on the rpm range. The detonation and pinging (what felt like power valve issues...) is gone.

Leon

[ducncover]

Originally Posted by twibs

ok sorted the float height problem out when i had it to bits to clean carb out had forgotten to clip the float valve spring over float tab !!!!

What float valve spring are you speaking of. I have been having mixture issues and have had my carb apart several times. I did not notice a spring.

[GG27]

Leon

I figured how to royate the carb so I can get at the jets. It is a tight fit, had to give a hard push to the carb against the fuel tank so it could rotate.

All is O.K. now!!

[GG27]

Hi Leon

I ran the following settings in the weekend:

pj 42
mj 175
Nieg #3

Temperature was between 17 to 23 C and the bike ran very strong with good low to mid response and screaming on top. The off idle to 1/8 throttle opening was rich and I had gone out to 3 turns on the air screw but the sputter wouldn't go away.... so I dropped the needle to #2 and sputter went away with air screw 2 out and the power and response was unchanged.

BTW I tried the CCK needle with a 178 main #3 and bike ran rich throughout the mid and only cleaned out at full open.

I wonder if the settings on this forum are for fuel rates that are in the USA because all the two-strokes in Greece always run leaner settings than the ones at the states. I cannot believe that a company as Gasgas send out their products with wrong jetting. I suppose every bike has to be set up to the riding areas and available fuels and the jets supplied with the bike can work.

I use pump gas 98 to 100 octane and 1:50 oil ratio. The americans tend to go to the leaner 40:1 oil ratio and 93 octane fuel, maybe that is why the base settings are richer to compensate for the different oil ratio.