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 The previous version was outdated and no longer supported.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

Fuel Injection question - 2011 TE449

hhdwtmtw

hhdwtmtw

He who dies with the most toys wins...
My COVID isolation OCD has kicked in and I was wondering how the ECU in this bike determines when to inject fuel based on which stroke the engine is in due to the flywheel sensor providing a pulse every revolution and without a camshaft sensor.

Does it fire the fuel injector every stroke with 1/2 the fuel for each cycle behind the inlet valve ready for the 2nd firing and intake stroke?

Or does it look at the manifold pressure drop?

Time to buy an oscilloscope..
 
So, I finally bought a Digital Oscilloscope as I'm doing some testing on replacement stators for the 449/511 engines.

The fuel injector and spark fire every second crankshaft revolution. I have since found out that although there is no camshaft sensor, the ECU determines the intake stroke via the manifold air pressure sensor. When the intake valves open and the piston descends, the intake pressure drops so the ECU can the identify the intake stroke.

The fuel injector pulse is small as I held the probe close to the injector to pickup the RF. There's no room to probe it directly.
 

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