• 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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motoplat versus sem

justintendo

justintendo

klotz super techniplate junkie
hey guys, lemme pick the collective for a bit....
on the 87-88xc, i originally had the sem setup that called for 2mm advance...now ive switched to an external rotor wr motoplat. the motoplat on the wr called for .61mm advance. now that im running the plat, do i use the xc timing spec that it originally had at 2mm advance or the wr spec of .61mm since im running a plat from one?
 
im guessing that the timing spec has more to do with port timing or pipe shape than brand of ignition.. any experience with altering from the stock spec? the past twp years the motoplat has been at about 1mm..it has ran awesome, started easy, no kickback..awesome bottom and mid with very little top. i know the 87-88 kinda run this way to begin with...but i like to mess with stuff even when it works well.
 
usually need to run a more retarded ignition on top end screamers due to gas dynamics at higher rpm, if your not screaming its box off then i would leave at 2mm.you could boost your compression as this increases the speed at which the combustion/ flame moves but i wouldn't bother just ride as is.
 
the WR and XC are essentially the same engine, same cylinder, same piston, the pipe is basically the same with a shield on the WR
tune yours as an XC and you will be fine
 
so if the wr and xc are the same mostly, why do they have a different timing spec? is it just because of the ignition difference? im in running the motoplat do i stay with the .61mm?
 
justintendo said:
im guessing that the timing spec has more to do with port timing or pipe shape than brand of ignition.. any experience with altering from the stock spec? the past twp years the motoplat has been at about 1mm..it has ran awesome, started easy, no kickback..awesome bottom and mid with very little top. i know the 87-88 kinda run this way to begin with...but i like to mess with stuff even when it works well.
Click to expand...


Don't know if this helps, but here's what experienced Husky guys run out here in the NW. The notes are their settings. For expert riders.

1987 430WR TECH SHEET.jpg
 
I have an 87 CR250 and had an XC250
Kept the CR and never really rode the XC so can't really offer insight
Try both one will work for you
You know the ranges of advance you can play with right off
Don't forget to lap the mag rotor when you remount it
It's all about having fun and going vintage
 
yes, i really do love the bike..it has a bit of topend, but a nice broad torque from very low to upper midrange..great for tight woods..ill play around with it...worked well set at 1 degree...always starts 2 kicks cold, one kick hot..
loved the light output on the sem, was a great ignition except when it got the "fire up and run in reverse virus"....
 
Take care.
The SEM has NO built in advance thus the 2mm setting.
I believe that the Motorplat has a built in advance so if you set it at 2mm and it advances from there you will have a problem.
Stick with the recommended settings.
Cheers
 
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