Rich at idle, lean off idle Fcr mx 41 husaberg 650

it is your E needle, they are too long on the straight before the taper begins. to prove it, lift the needle up one clip and your problems will be solved even though the midrange becomes rich as a result.

Try a D needle on and R or an S like a DMR or a DMS. your 3/4 throttle won't be as good though.

Taffy

well as I say, the E series gives a flat spot.

Taffy

Hopefully you will follow this?
Try a DMS. and lower thre PJ considerably. it may even take a 38PJ?
Taffy

Hi,

At first, apologize for using another thread, I can’t create my own.
I have a FE550 (2008 model) for a many years. In general bike always started very well. Same carburetor settings (yets, needle) three years. Suddenly weird problem appeared. Started a bike as usual with choke, but closed it almost immediately. Engine stopped and didn't start any more. When I kick, it almost starts (for a half a second) and then stops again. Changed the plug, opened a carburetor, looked yets, didn't see anything wrong and put everything back together - and as I thought, no changes. By kicking almost starts (by every single try). Opened a carburetor again and cleaned everything quite throughout (ultrasonic, carbclean, compressed air), changed the pilot screw gasket, back together - no changes. Have played with idle screw and pilot screw, no success. Checked the chain tensioner - seems working (chain quite fresh, 3rd click). During this second, when engine runs, it does not make any weird noise and no smoke or smell or something else wrong from exhaust. Checked the tappets, everything fine, but adjusted again just in case. Having double springs, as far as I can see they are not broken. Then opened the carburetor again, including mid body. Everything seemed ok, but still putted new gaskets (for mid body part only), additionally new choke and hot start knob, new vacuum plate gasket and just in case a new idle jet. No success. Measured the stator, everything within spec, measured ignition coil – it was a bit out of spec, so I replaced it with another used one which was within the specs. No success. Then played again with the screws. I could get it started for approx. 7-10 seconds when idle screw full out and hot start knob out as well. When it runs for this short time, there is no abnormal noises. I still have the feeling that its carb, but I can’t imagine what it could be. Every idea what could be wrong is welcome.
Please excuse if typos or poor wording have been used, not the first language.
Regards,

Toomas

P.S. Settings: on idle: air 75, pilot 40; starting original (85 I think it was). Main and needle don't remember, but very most probably it's not a reason, I really have had these for couple of years (I ride 500km per year and on road with FS wheels).

time to try another husaberg carburettor on your bike that is runnung fine. this will tell you if it is the carb or not?

cheers

Taffy