• 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 The previous version was outdated and no longer supported.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!

te 450 stuttering and backfire

P

partylikeits82

Husqvarna
Hey guys, I bought a 2008 te450 with the power up kit about a month ago, and ever since I bought it, I've been having some issues with it.
When I first start it up, it seems fine. However, once it starts to get warm, it develops a wicked stutter/stumble at low rpms, and a relatively constant throttle position. It seems to be the worst when cruising at 30mph in 3rd gear. It also pops and backfires real bad on deceleration, and will sometimes die at stop signs. The bike seems fine at high rpms, or basically any time I'm beating the shit out of it. I usually take it on rides with my buddies, where we ride for 10-20minutes, then stop somewhere and hang out for an hour or so. During a day of riding, it seems to get worse as the day goes on.

What I've done so far.
Coming from a motocross background, I have a pretty good understanding of how to fix bikes. However, this is my first injected bike.

The popping and backfiring lead me to believe that the valves were the culprit. I checked them, and shimmed accordingly, as the intakes were a bit out of tolerance. This did not fix the problem.

I read around a bit, and found that a bad battery could be the culprit, as it would not provide the injection system with adequate voltage. Replaced with and AGM battery, but did not fix the problem.

The previous owner replaced the fuel pump with an aftermarket one( not sure what brand). I checked to see if it was installed correctly, or if it possibly moved out of the plastic sleeve that it sits it. It hadn't moved at all, and I even put the factory pump back in to see if the aftermarket one was faulty, but alas, my problem persisted.

I have searched around a lot, and have not found the answer to my problem. I'm hoping someone on here has experienced this problem, or has some ideas. I have heard that the coolant temp sensor could go bad, and cause something like this to happen. The bike does feel like it runs rather hot, so maybe that is it?
 
partylikeits82 said:
... it develops a wicked stutter/stumble at low rpms, and a relatively constant throttle position. ... It also pops and backfires real bad on deceleration, and will sometimes die at stop signs....
Click to expand...

Before you spend too much time going into technical troubleshooting, try something simple like putting a brand new spark plug in. That appears to be the problem I had when I had similar symptoms to you.
 
OlderHuskyRider said:
How does it run when it is cold, and you first start it up and take off?
Click to expand...
When its cold, it seems to run fine. As it warms up and gets hot, the symptoms get worse.
After doing some more reading around yesterday, I ordered a coolant temp sensor. I'll put a new plug in it as soon as I can get somewhere to pick one up.
 
Check to make sure your coolant is flowing strongly, remove cap when cold, rev bike a little, stream should be strong and steady. Impeller could be loose on the water pump shaft.

I just replaced my water temp sensor for the 2nd or 3rd time. A previous failure, it failed open and the fan ran as soon as i turned the key on so i knew that one was bad. This current failure, it failed closed and the fan was not coming on at all, the bike was getting hot without me knowing it, and stuttering, cutting out, not idling on slow-downs with the clutch pulled in. I had gotten out of the habit of always checking my fan when I'd come home from a ride or before I left for a ride by using my infrared temp gun, I put the laser on the brass coupling of the water temp sensor, my fan will always come on at 220F

HuskyWTSmeasure_zps6651c6a9.jpg
 
partylikeits82 said:
When its cold, it seems to run fine. As it warms up and gets hot, the symptoms get worse.
After doing some more reading around yesterday, I ordered a coolant temp sensor. I'll put a new plug in it as soon as I can get somewhere to pick one up.
Click to expand...

That is a good move- does the fan come on when hot? it should-
having it hooked up to Ibeat for TPS and fuel settings would be the next thing.
 
I took it for about a 20 minute long beat run on Sunday. After I got back, I let it idle for a few minutes, and the fan never came on. Meaning that the temp sensor could have failed closed. I guess it makes sense. The bike thinks it's cold when its actually hot, therefore dumping in excess fuel. It runs way too rich at part throttle, causing a stutter. Fuel in the exhaust causing the backfire.
 
Have you ever took it to a husky dealer to hook it up to Ibeat. I know you have some other symptoms, but the stuttering in 3rd gear?
 
Was this issue ever resolved? I'm having almost exactly the same problem, except stuttering in every gear in low RPM range. My battery does seem to be quitting on me (poor starting capability that frequently dies and causes trip meter to reset + rear tail light flickering when activated at idle), but that doesn't explain why it doesn't happen all the time as opposed to only after it gets thoroughly heated up. I believe that it got better after I stopped and filled up at a gas station, leading me to believe it was something with the fuel pump. I've already removed the fuel pump assembly from the tank and everything seems to check out just fine. Removed throttle body and cleaned the injector and throat + passages I could reach. Replaced spark plug, which had dry fouling just like the last one. None of this seemed to fix it. It came with the power up kit installed, but not sure if it ever got re-tuned with the iBeat software.
 
I believe so. I've seen other posts with aftermarkets that wouldn't fit the plastic shroud, so it was removed, but mine still has the plastic shroud and OEM oetiker clamps and so on. Joe, I haven't fixed the issue yet. What did you do to fix yours?
 
Well I changed the temp control sensor on back of cylinder head along with the fan sensor in the radiator. Which made my fan start working properly, but my other issue that was making my bike backfire and bog was the stater....my fan would eventually turn on but would come on at the wrong temp because of sensor and would run at a lower speed because of voltage...weird I know but somehow it worked??? Have you done any of these?
 
Not yet, found this thread yesterday after getting fed up with the problems again. My fan comes on fairly reliably, but maybe not at the right temp. I'll take a look at these parts when I get time, but I suspect my stater+battery might be part of the issue. Did you just replace the stater, or just rewind it? If replaced, do you remember where you got it from and approx. price of the part?
 
MGman88 said:
Not yet, found this thread yesterday after getting fed up with the problems again. My fan comes on fairly reliably, but maybe not at the right temp. I'll take a look at these parts when I get time, but I suspect my stater+battery might be part of the issue. Did you just replace the stater, or just rewind it? If replaced, do you remember where you got it from and approx. price of the part?
Click to expand...


Have you put a multileter on the battery. It should be 12.8v standing, it should not go below about 10-11v when cranking to start, and when running, it should be 13.8-14.2v
 
OHR, not yet, but thanks for the voltages. I'll check it out when I get the chance. I suspect that the battery isn't the issue because it seems to progressively get worse from start to finish of each individual ride and I don't put it on a tender in between rides. It is very likely an issue that I'm facing in general though. Joe, thanks for the suggestion, any way I can lose some weight will be helpful. This husky is tall for me and not as easy to handle as it is.
 
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