• 4 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     TE = 4st Enduro & TC = 4st Cross

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

2010 TC250 carb setting in hot climates (100+), HELP****************************************!

G

GranburyChuck

Husqvarna
C Class
Hi all. Bought a 2010 TC250 over a year ago. I have had intermittent starting and running issues since new. Early this year when the weather was only around 85-90 in Texas I was riding and having fun. About a month ago went to ride and couldn't get the bike started. Every day prior to that Saturday I would come home from work and kick it over a few times to check that it would start. It was so easy to start it was ridiculous so with confidence I went to the track. Made a lot of adjustments on the fuel screw but it takes so much to get to it I just quit. I have had jet changes : stock OBDVR jet 3 clip, main 180 pilot 40 and leak 35. Bought the JD Jetting kit and fuel screw: red needle 4th from top, 180 main, pilot 42, leak 60, small oring on accelerator. No luck at all starting. Changes the fuel screw from 1 turn to 2 turns out in 1/8 increments. It was around 100F and 50% humidity. With no luck on that I went to look at the cam valves: intake 0.14 and exhaust .229mm. I got a cam shim kit and set it to .165 mm (I) and 0.203 mm. Tried to kick it a few times and it would just start to catch but not enough to fire. I have tried with choke, w/o choke, w/ squirt of gas, w/o, fuel screw set at 1 turn to 1.5 turns out. Perhaps in hot Texas I need to back down to a 38 pilot jet? Anyone else in the heat have ideas on jetting? Please help. I want to stick with the Husky but this is ridiculous. I have spent more time working on it than riding it.

Should I go into the oil change fiasco where the oil drain plug would get cross threaded. I ended up removing the motor, using a threadchaser to clean the thread. The cross bar on the bottom of the frame limits the amount of travel of the oil drain bolt. I may cut it off and weld in a bar on top.
 
I'm in Nashville, TN and I've been having similar problems. 2006 TC250, starts easy as you like when it's cold or even slightly warm. As soon as it gets hot, impossible to start. Just started doing this though.

When it gets hot, starts getting noisy on the top end. Almost sounds like an exhaust leak or valves clattering. I checked the valves and they're right. I have the JD kit. But I have a 42 pilot. I almost think I need to go up another.

I'm riding this in the woods though. I don't much of any mx riding.

A buddy, who is a bike mechanic and rides dirt bikes all the time, was telling me today that he found similar issues on KTM 4 strokes. They came stock with 42 pilots, like my bike, and it was too lean for Tennessee. May be the same in Texas. He went to 48 on KTMs and they ran great and started up easy as you like.
 
Friday got home from a trip and temperature was much more moderate ~90F. Decided to try and start the bike and after about 20 kicks, w/ choke on it started. After warming up some pushed in choke it died. Tried to start w/o joke and no luck. Put choke in and it started easily. take choke off and it dies. Today changed the pilot jet back to a 40 and tried over and over again to start. Adjusted the fuel screw mostly out past 1 1/8 to 2 turns out. A few times it acted like it wanted to start with a couple of burbles but just didn't light. Temp was about 80F. I have messed with the idle screw on the side of the carb and have no idea what baseline is and can't seem to find it anywhere in manual or net.

It seems my way of thinking of a carb is based upon 2 strokes. Think I am getting it backwards whether I need to let more air or more fuel in.

On ThumperFaq seems to suggest that we should go to smaller pilot jets in warm weather.

http://www.thumperfaq.com/jetting.htm
 
I read that thread when I started chasing my tail on mine.

I had a 42 pilot already when I got the JD kit. Re-jetted, went for a ride Saturday, same problems. As soon as it's hot, it's a bear to start. It was being a little better than the last time mainly because I had a full charge on the battery and was able to use E-start a few times and save my leg. I could feel a slight increase in power past the 1/4 throttle area, but the woods in Tennessee are so tight and technical, I'm hardly ever out of the pilot/throttle cutaway circuit. Once when it died on me, I held the decomp lever in, turned the fuel off, pulled the hot start button, held the throttle wide open and kicked a few times. Then found TDC, pushed just past it, no throttle, kicked through, and it started. Think that happened twice.

But the bike still smells like it's running hot and burning oil. I have a few more things I want to check before I say what the issue might be, but it won't be until after end of this month as I'm about to go out of town for 2 weeks for work.

I would say, if your bike is hesitant to start when cold and wants to die when you push the choke in, you're lean. Mine starts easy cold with choke, and I can take it off pretty quick. I think I'm 1 1/2 turns out on the fuel screw. I want to get mine warmed up and play around with that screw and see if it feels like it wants more or less on idle and go from there. Problem is mine has an electric starter and it's hard as hell to get to that screw and hot as hell around there when the bike is warmed. Really wish it had a screw on the side you can get to with a long screwdriver like a Mikuni TM flat slide.
 
A common mistake some motorcyclists make in jetting is to "fatten up" the bike when it is hot out to "make it run cooler". But hot air is less dense and has less oxygen in a given volume so what's needed is less fuel (leaner) to match up with the reduced oxygen.
 
That was the direction I was "leaning" towards. Leaner mixture since it seems to want that. Plug is a little on the dark brown side, so I'm not too worried about it being too lean.
 
Sunday afternoon I was ready to pull the carb off and give it a thorough cleaning. I decided to attempt to start it first. Gave it a few kicks with the choke on and a squirt of fuel. Started up. Let it run for awhile to warm up then pushed in choke and it stayed idling. Turned up the idle to high idle then started to turn in the fuel screw. Took quite a while to get it to stumble. Killed it and checked the fuel screw was only ~1/2 turn out. It would run okay if I blipped the throttle and let off. decided to take it for a short ride (can't upset the neighbors). When I got back killed it and tried to start. Bike was quite warm so no gas and used hot start. Nothing happened. Was about to quite when I decided to put the choke on. Started right up. Went riding again up and down the street. When chopping the throttle got some popping but not too bad.

This evening come home to try and start it ~95F and can't get it started. Turning in the fuel screw (had it out to 1 1/2) and no starting. It seems to be extremely sensitive to temperature. My temperature is increasing.
 
Just to add a little to this...on my hot start issue in 90+ weather and high humidity.

I fired mine up and ran it around the back yard to get it warmed up. Rode it around in circles for about 10-15min at steady 1/8 throttle and few blips to lift the front end. It stalled out a few times blipping it, but it started up ok since it was still kind of a cold engine. I started adjust my fuel screw (it was 1-1/2 turns out) and turned it all the way in and it still idled fine...actually a little better(faster).

So I backed it out a little, maybe 1/4 out. It starts up 1st kick pretty easily. When it stalled out as I was running around the yard and I needed to restart it, I had to use hot start and it took a few kicks. After turning the screw in, 1st kick, no hot start. I'm at a 42 pilot right now. Going to get a 40 and a 38 and see what happens. This all may be for naught since I'm just taking it easy around the yard. We'll see tomorrow when I go on a ride up in Kentucky with the local rider's club.
 
There will be one of these bikes with the Lectron soon (2010 TC250). will be real interesting to see if it makes these hard to start beasts EZer to start.
 
The ride yesterday went well. Very humid and low 90's after a late night, early morning rain. Bike ran much better than it has been with the fuel screw in almost all the way. Couldn't get a smaller pilot to try out yesterday, but the bike started pretty easy(much better than before). Best part was the extra power and ease of starting helped me ride a little better. Really muddy conditions, but the bike found the grip quite well. Even on some pretty nasty hill climbs.

When hot and I stopped in the woods, I would use the hot start and it usually never took more than a few kicks. I used the starter a bunch as well though. In a tight single track section, it kept stalling out coming around some of the sharper turns. I could usually hit the starter and get it going again without having to fully stop the bike and put my feet down.

Going to try a 38 and 40 Wednesday and maybe go for a ride Thursday with a friend who is picking up a new TE511 tomorrow, as well as the pilot jets I need.

Granbury Chuck, have you had any more luck?
 
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