• 2 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     WR = 2st Enduro & CR = 2st 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.

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250-500cc 2009 wr300 high compression head

jonnywr

jonnywr

Husqvarna
AA Class
Hi
Just got this 2009 wr300 was about to do a top end and noticed this number on head to what I believe is the high compression head?
Also has a B stamp does this indicate piston size?
The number in question is the one at back between hoses
Pic of bike
Ps I had one of these new in 2013 this 2009 seems more powerful everywhere.
 

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As per the part number it really seems like the mystical 'race head' :

S

250-500cc Thread 'Where to buy WR300 race head'

I am looking for the factory high compression 'race' head for my 2009 WR300. Part number 8000H0944. Does anyone know who has this in stock or who can get it? Thanks. -Todd


I tried as well to get that head in my hands back when I had the WR300 but it was impossible... In the end I had my oem head cut to a different dome profile that worked really good...

Regarding the letter B on hour head, I really don't think it has anything to do with the piston, maybe a different mold or something ...
Cylinder sizes (A or B) are sometimes written or engraved on the cylinder, but not cast as in your head, as this measurement is done after the fabrication and engraved or printed manually. On a lot of bikes this can be found inside the power valve compartments.

When changing pistons, always measure the bore to get the correct sized piston ;)

Cheers !
 
Last edited:
You’re correct that’s the hi-comp head. The b doesn’t mean anything. I do have a hi compression head if anyone is looking for one.
 

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