Husaberg 70 Degree Owners Thread!

Discussion in 'Thumpers' started by KayaKTM, Nov 22, 2010.

  1. rossbotha

    rossbotha n00b

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    I had exactly the same problem and it was the torque limiter for the decompression system. Replaced by KTM and no problems since. It also did it when hot


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  2. keener

    keener Speed changes you.

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    Tonight I by passed my thermostat by cutting up one I had lay around. I have been meaning to do this for a while.

    You can't just pull it out. The oring in the thermostat housing won't make a seal without a thermostat or a washer with equivalent thickness in there. I think I saw a company making a washer just for this purpose.

    This should make the coolant flow a lot better. Bike will take longer to warm up. I don't ride in the winter so I don't see this to become a problem.

    [​IMG][​IMG][​IMG]
  3. AUSSIEADV

    AUSSIEADV Long timer

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    The FX450 runs a slightly different system where it doesn't utilise a thermostat. Wish it did though.
  4. NoClassic

    NoClassic Adventurer

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    You can also replace the thermostat with a large washer to get the o-ring to seal on the housing
  5. Smox

    Smox Adventurer

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    Hello everybody,
    did anyone have problems with the hot start decompressor on the camshaft?
    I had problems with hot engine starts; Found out that the decompressor was worn out and had to replace the camshaft.
    2011 FS570 with 4400 kms on the odo.
    Cheers!
  6. PABiker

    PABiker Anywhere but here

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    Recent discussion about that issue starts at post #9193.
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  7. SRG

    SRG SRG

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    Why? My 300+ hr. FX450 runs fine. Doesn't have a fan either - which can be an issue on slow, tough trails when it's hot out.

    I have thought about adding a fan (but I don't do much hardcore singletrack), but what would I get out of a thermostat?
  8. Baggi'tard

    Baggi'tard Assventure rider

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    You going to bring that thing down for the 70° rally in October? And bring some Starr Hill with too? :beer
  9. AUSSIEADV

    AUSSIEADV Long timer

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    Why? In winter etc it runs too cool. Internal combustion engines run a thermostat for a good reason, good enough for me.
    jdubb75 likes this.
  10. SRG

    SRG SRG

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    I don't ride my Berg when it's cold (mid 40's F or less).

    My bike did not come with a thermostat, that was OK with the folks that built/designed it and has been no problem in my ownership.
    keener likes this.
  11. keener

    keener Speed changes you.

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    I bet most of these bikes over heat but the owner doesn't realize it because there is no warning light or a gauge on board. The only indication is coolant boiling over.

    Most kind of coolant doesn't boil until they reach +114c. That's just too hot. Optimum temp for internal combustion engine is around 90 C. Even a bit cooler makes more power but not as efficent. Some fancier coolant that "do not boil" until higher temps are even worse.

    IMO, removing the thermostat is not for those who ride at speed in Winter.
    AUSSIEADV likes this.
  12. AUSSIEADV

    AUSSIEADV Long timer

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    So you are saying your bike doesn't have the provision for a thermostat?

    The thermostat cops the blame too easily. It is there to regulate an ideal operating temperature. Mine doesn't get to half of what it should be at. Just because it runs fine doesn't mean it is fine. There could be premature wear involved. Clearances are optimised at a certain temperature. The mind boggles when some think the expense and effort to implement a thermostat is unnecessary.
    sico likes this.
  13. SRG

    SRG SRG

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    The FX models do not have a thermostat. I would guess as "competition" models the assumption is they won't be used in extreme cold.

    Thermostats do not really regulate the engines temperature. After a few minutes of warm up, the thermostat is/should be wide open and will remain that way until the motor is turned off and begins to cool to ambient temp.

    A thermostat's sole function is to promote faster warm up, which is only really needed when the motor is quite cold. If you were to live in a mild/warm climate, none of your engines would need them.

    Not having one has a couple of advantages - 2 less joints to fail and no restriction (however minor) in flow by the open thermostat.

    If you want a temperature gauge on your bike, the TrailTech Vapor dash has one - some others too.
    keener likes this.
  14. jdubb75

    jdubb75 Vicarious Adventurer

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    I'm installing the JD Tuner today and thought I'd hop on here and see where others had mounted their controllers and I noticed that my VIN sticker is on the opposite side of the frame as yours. Mine is right above the voltage regulator where you have your JD controller mounted. Weird.

    FWIW - I think I'm going to mount the controller behind the number plate, but it is getting pretty busy behind there with the additional wiring for signals and what not. I'll likely be making some standoffs or something to space the number plate out a little...down the road.
  15. jdubb75

    jdubb75 Vicarious Adventurer

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    Finally got it back together today...

    Photo Sep 16, 4 57 57 PM.jpg Photo Sep 16, 4 58 12 PM.jpg Photo Sep 16, 3 42 29 PM.jpg
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  16. AUSSIEADV

    AUSSIEADV Long timer

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    "Perhaps the most common example of purely mechanical thermostat technology in use today is the internal combustion engine cooling system thermostat, used to maintain the engine near its optimum operating temperature by regulating the flow of coolant to an air-cooled radiator."

    The reason for different temp thermostats is adjust the maintained temperature which is critical to prevent premature wear.
  17. keener

    keener Speed changes you.

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    The main reason for faster warm up is meeting emission requirements.

    The sooner a bike reaches 90C the less emission it produces. That's why all road legal bikes have a thermostat. Most off road only KTM bikes don't come with a thermostat and use the same engine as the road legal bikes. I have seen a few FE450 that didn't come with one from.the factory. They just have a Y pipe.

    Engine must cool down significantly for the thermostat to close. These engines are designed to start up in cold temperatures and not fall apart. Tolerances are all calculated for cold to hot conditions.

    Unless we are ice racing in well bellow freezing temperatures and only at high speeds, thermostat won't do anything. It stays open most of its life.

    My trailtech temp sensor and guage are on the way. I won't be monitoring it all the time but at least I'll know if my bike is running dangerously hot or cold.
  18. SRG

    SRG SRG

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    Thermostats are fully open well (+_20C) before the engine reaches normal operating temp. Once the engine is at normal operating temp., thermostats do not modulate coolant flow to regulate engine temp. There really is nothing more to it than that.
  19. AUSSIEADV

    AUSSIEADV Long timer

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    Sorry guys but I have to disagree.

    Thermostats were around along time prior to concerns about emissions.

    If engine tolerances were optimised from cold there wouldnt be a need for a thermostat in the first place.
    jdubb75 likes this.
  20. jdubb75

    jdubb75 Vicarious Adventurer

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    Pop out your thermostat and suspend it in a pot of water. Make sure it's not touching the sides or bottom. Drop in a thermometer and heat the water. You will be able to see the temperatures at which the thermostat opens and closes and realize it does modulate coolant flow based on temps.
    AUSSIEADV likes this.