09 FE450, hard start when hot unless choke engaged

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bikemechanic53

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Jul 27, 2011
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nowhere near here
I did some searching, but could not find any references to my problem.

I've got an 09 FE450, fuel injection. It has recently decided it doesn't like starting when it's hot. Starts OK when cold. I pulled the choke ( idle speed adjusting screw) out and it starts right away.

I just changed the injector, but that made no difference.

According to the Husaberg manual, the idle speed adjusting screw, when pulled out, only raises the idle speed. So I'm stumped.

Anyone have any ideas?
 
I have a `10 FE390, just got it recently, so I don't have much time on it. It had trouble starting hot, but it also had some very small hiccups/hesitation when held at constant rpm. It turned out to be a faulty spark plug, now it starts great every time, and runs without any hiccups. Interesting thing, the hot starting issue could be cured by pulling out the "choke" - which as you write just raises the idle speed. If you haven't changed your spark plug recently, might be worth trying - make sure to get the iridium version, NGK LKAR8AI-9.
 
Cancel my previous post, the new spark plug cured the hiccups, but not the hot start issue. For the 390 I've read opening the throttle just a few mm-s help, and sure it does for me. Try it on your 450.
 
Thanks. I'll change the plug anyway and see what happens.

When I crack the throttle, the bike turns over much slower. Seems like the auto-decompression disengages. It should not, as it's a simple centrifugal mechanism.
 
the idling is meant to be quite high, about 1800rpm I think. Try turning it up a bit, if the choke or cold start makes starting easier this could be all it is. You also need to prime the injectors by giving the starter a *** to let the fuel pump get up some pressure then start the bike, shouldn't need any throttle.
 
Spark plug cap gives issues on theses bikes. Always good to have a spare, I've replaced mine twice.
 
Got the hot idle set at 1800. But still starts hard when hot. I've had issues with the spark plug cap before. I'll replace this one and see.

Thanks,.
 
Hey bike53 my 09 570 was recalled to have a upgraded auto decom and cam fitted, apparently to cure hot starting/slow/hard cranking issues. Mine was a very early 09, might pay to check your vin with a dealer.
 
I have the same bike and am having the same problem. Was thinking about contacting Taffmeisters about it. I will keep an I on this post and let you know if I discover anything. Thanks.
 
I checked with the local San Diego dealer who said my bike was not part of the auto decomp recall. So I'm working on the premise that it may be an electrical issue. Maybe the spark plug cap, as previously noted.
 
The plug cap is on Item I never looked at on my quest for easy hot starting, I am interested to see how it goes for you.

Re throttle opening. If you crack the throttle more air is allowed into the cylinder causing higher compression pressures.
 
Test the cap with a meter should be around 5K ohms. Have heard when it goes bad it still has resistance drops down to 2-3K ohms
 
I've been searching for the solution to a similar issue with my 2010 FE450 with 80hrs on it.

Bike starts fine when it's cold, struggles to start when it's hot, it's not the battery or how much throttle i give it, the motor turns over slowly regardless.

I think it is struggling against full compression meaning the Auto-Decomp isn't working properly.

I found this older thread that may be of some help, if i can resolve my issue i will post up the results here aswell.

viewtopic.php?f=5&t=11997&hilit=2009+fe450+hot+start+issue
 
Hi Guys,
Im having the same issue, 09 450, 142 hrs, 5900km.
New battery and plug, pump working fine,fluids new, valve clearances good.
Starts cold perfectly without choke.
Runs awesome as she always has. Stop for a drink etc, then struggles to start.
If I use choke, it will start, or if I'm ontop of a long hill, clutch starting works ok.
I've been reading about the decomp recall, will check into that.
Also read about a torque limiter issue.
Does anyone have a difinitive answer?
Cheers guys
 
when the bike is hot and you have the hard starting issue, take the seat and air filter off, open the throttle to wide open and have a look at the injector nozzle, you will see a little dribble or drop of fuel.
 
A new spark plug cap solved 80% of the problem.

Cracking the throttle when hot also helps.

But no definite solution to hard hot starting yet found.
 
I suffered with hot hard starting and some low speed stalling when hot for a year.
Usually had to bump start or wait a few minutes to cool down. Otherwise my 2009 FE450 (300 hrs with original 5 year old battery battery) started and ran perfect.
Replaced battery with a high powered Shorai Lithium and hard hot starting and stalling problems were fixed. Another 90 hrs and no hot starting or stalling problems.
 

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