• Husqvarna Motorcycles Made In Sweden - About 1988 and older

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 The previous version was outdated and no longer supported.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

Educate me on Motoplat

Old Geezer

Old Geezer

Husqvarna
A Class
Please excuse as I ask probably stupid questions, but I'm still learning all the ins-and-outs about Husqvarna having cut my teeth on Asian versions since starting riding dirt over 45 years go. I know most of what there is to know about THOSE bikes, but THESE Swedish things are a different story.
So I'm getting close to kicking my XC and perhaps firing her up again after several years of languishing away in the garage. I never did like the spark, and recently swapped out the internal rotor setup for an external in hopes of gaining a bit stronger spark.

The Question: I'm so accustomed to Jap bikes with a stator coil that sends a signal to a CDI which in turn boosts to the coil for a nice hot spark. So how does the Motoplat system work since there is no CDI to provide that nice voltage spike when the capacitor discharges to the coil? If they rely solely on coil windings and the speed of the rotor to generate the voltage, then I can see why these bikes can be a royal bear to start...especially big'uns like my 500XC.

Could not a person buy an after-market standalone CDI to hook inline with the stator coil, and get some better sparkage?
 
Ok guys, I find it hard to fathom that a magnet passing over a coil of wire (as in rotor rotating past a stator) can produce the high voltage needed to fire the ignition coil to the plug. Thus, I must surmise that a capacitive discharge circuit (capacitors and triggering transistor) must reside somewhere inside the ignition coil...since there is no separate CDI box as one might find on Jap bikes.

There are after all only two wires coming off of the stator to the coil....one carrying maybe 200V AC generated by the stator and the other being the low voltage trigger signal. The capacitor charges up, the trigger signal dumps the charge to the coil, and the coil secondary windings boost the voltage to the 1000's to bridge the spark gap.
So there must be a CDI lurking in and around Motoplat ignitions after all, right?
 
Old Geezer said:
Ok guys, I find it hard to fathom that a magnet passing over a coil of wire (as in rotor rotating past a stator) can produce the high voltage needed to fire the ignition coil to the plug. Thus, I must surmise that a capacitive discharge circuit (capacitors and triggering transistor) must reside somewhere inside the ignition coil...since there is no separate CDI box as one might find on Jap bikes.

There are after all only two wires coming off of the stator to the coil....one carrying maybe 200V AC generated by the stator and the other being the low voltage trigger signal. The capacitor charges up, the trigger signal dumps the charge to the coil, and the coil secondary windings boost the voltage to the 1000's to bridge the spark gap.
So there must be a CDI lurking in and around Motoplat ignitions after all, right?
Click to expand...

Never mind...the Old Geezer is just getting old. Answered my own question via Good Old Google. See here: https://www.google.com/url?sa=t&rct...E96xRVn7ADMuZ6yxy4TUw&bvm=bv.1355534169,d.cGE
 
Old Geezer said:
Please excuse as I ask probably stupid questions, but I'm still learning all the ins-and-outs about Husqvarna having cut my teeth on Asian versions since starting riding dirt over 45 years go. I know most of what there is to know about THOSE bikes, but THESE Swedish things are a different story.
So I'm getting close to kicking my XC and perhaps firing her up again after several years of languishing away in the garage. I never did like the spark, and recently swapped out the internal rotor setup for an external in hopes of gaining a bit stronger spark.

The Question: I'm so accustomed to Jap bikes with a stator coil that sends a signal to a CDI which in turn boosts to the coil for a nice hot spark. So how does the Motoplat system work since there is no CDI to provide that nice voltage spike when the capacitor discharges to the coil? If they rely solely on coil windings and the speed of the rotor to generate the voltage, then I can see why these bikes can be a royal bear to start...especially big'uns like my 500XC.

Could not a person buy an after-market standalone CDI to hook inline with the stator coil, and get some better sparkage?
Click to expand...
Seems you and I have the same problem...
 
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