• 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.

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84 500 ignition timing

gday

gday

Husqvarna
AA Class
Can someone help me with the recommended timing in an 84 500 . 1.8mm BTDC rings a bell and I'm sure I've seen it more than once in threads here but I can't seem to find it. Whilst I'm at it, has anyone had any experience with the pvl motoplat replacement coils? Thanks
 
The 84 500 auto technical data sheet says it uses 2.8mm BTDC - 18 degrees of advance. Also seen it specified in another Husqvarna publication with all the 84 models listed as 2.2mm or 16.5 degrees.

Paul Rooney told me to set it at 1.8 mm. I still have his email. He also said to use a BP7ES plug with a 22 thou gap.

I think more retarded will give smoother power from memory.....or it might be me who is retarded! Anyway it is something to play with to see what you like best.

Thanks for the question. Since I (ab)use mine for VMX and not vinduro I might advance the ignition to make it a bit more aggressive.

Cheers
 
Thanks PEZBerq. Only just getting the xc500 back together after seizing it badly at Harrow 2014! On a fresh top end( I did find some airleaks so I'm hoping its solved ) . Starting was always hit and miss- Still think my motoplat mini 6 is a bit weak on spark with the low revs at kick over on the 500( motoplat tests ok) was wondering if anyone had used the pvl coil they sell to replace the motoplat coil and if it's an improvement ? Got a decomp on it now which might help in some ways. Glenn
 
having the timing backed off is the go, starting is much easier for the foot and the motor will be a lot less aggressive on initial throttle. something old people with big bore two strokes appreciate. my timing on the 400 is soft and it starts left foot kick sitting on the bike. might need a new set of rings:thinking:
 
suprize said:
having the timing backed off is the go, starting is much easier for the foot and the motor will be a lot less aggressive on initial throttle. something old people with big bore two strokes appreciate. my timing on the 400 is soft and it starts left foot kick sitting on the bike. might need a new set of rings:thinking:
Click to expand...
you may need rings, but i start my 430 sitting on the bike alot too..maybe your bike is just set up right:thumbsup:
 
Just a note, retarding the timing probably works well for your low altitudes (elevations). I find my 500CR works best at 2.8mm, but then I am at 6000 ft (about 1800 meters) above sea level.
I also start my bike while astride it, but with a brick under my right foot when cold starting.
Usually fall off the bike once it's running though. :D
 
Not sure about the altitude making a difference. Jetting should take care of that although overall less power is available due to less fuel able to be burnt. Running a decomp device make the biggest difference in starting. My chicken legs can start the 500 easily!
 
PEZBerq said:
Not sure about the altitude making a difference. Jetting should take care of that although overall less power is available due to less fuel able to be burnt. Running a decomp device make the biggest difference in starting. My chicken legs can start the 500 easily!
Click to expand...

True, high altitude air is less dense, so we jet leaner for a less dense air charge. Since the air/ fuel molecules are farther apart, the combustion flame propagates (spreads) slower (not much, milliseconds maybe). More timing advance just allows the maximum combustion burn to occur at the proper point after TDC and helps compensate for the decrease in power. But then, like you, I use mine for VMX, so I like more "hit" out of the corners.
My original intention was for the sake of those reading the thread, who live at different altitudes, some may find that a different timing works better for them.
My hat is off to you guys, you have more power than I do. :eek:
 
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