Hi all

Ive had my 04 290 for couple months and after a few weeks practice did my 1st competition today. Mightey craic. Loved it. Though today on the slower competition sections the bikes been loading up and needed a good handful of revs to clear it out the odd time. Had to do this before each section today or the bike would choke up and chug out the smoke just when I'd need it to be sharp on the throttle. Fuel mix is 65ml/5l petrol ipone s2 . Pulled the carb tonight and jets are 34 pilot 126 main and the needle clips was on the bottom groove. Ive moved the clip to the 3rd from Top groove now to lean er out a bit. Plug is currently a br7es which I now realise is completely wrong. I should have checked the plug 1st and I realise it's running with far too cold a plug so I've ordered a couple of br5 plugs which I think will make a huge difference to the loading up issue. Bike starts 1st kick when cold but was reluctant a couple of times today when hot even after running fine and being stopped on the kill button whilst waiting my turn at a section. Almost like it had a fouled plug but never actually fouled a plug. I think I'm In the right ballpark with regards jets sizes aren't I. Riding here in northern Ireland not high altitude or anything. Thanks

Standard plug would be a BP5ES.

Needle clip in third rung down.

Jetting varies a bit with fuel and such, but I would get the main down in the 118-120 range for cleaner running. 34-36 range on the pilot seems ok for many.

Float arms set parallel with bowl surface when inverted.

Edited September 2, 201214 yr by copemech

Yes it's the BP5es plug I've ordered. Don't know where I got br5 from. Ill get the setting back to what's std here in uk and should improve the situation.

float level should be 18.5

r means its a resistor plug i think