• 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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1978 390 porting

cntymnty

cntymnty

Husqvarna
AA Class
I'm curious as to the intake ports on a 390. Mine is a 78 OR. When I had the motor rebuilt, I noticed the intake ports were large rectangular. Now I've seen a couple pics posted of a CR and now a WR cylinder showing the intake ports that are L shaped, mirroring each other. Unless the OR intake ports were unique, I guess mine has been ported. The bike runs great, no complaints there. Thoughts? Reasons for opening up the intake ports like that? Reliability decrease?
 

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These ports are stock. I don't remember seeing L shaped intakes on a vintage Husky. Maybe you could post one of those photos you saw.
 
Now I've seen a couple pics posted of a CR and now a WR cylinder showing the intake ports that are L shaped, mirroring each other.
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Okay, I'm confused, which comes as no surprise. Are the L shape ports somewhere in the above pics? They look stock to me.
 
The two pics I posted in my original post are my intake ports. Large and rectangular. There’s two pictures in the thread that I mentioned that have the L-shaped ports.
 
Also, Here’s a pic of the 78 390 CR cylinder from The Cycle Guide review of the bike in 1978
 

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Oh, on the inside of the cylinder. Yeah those booster ports are factory. So you're saying your cyl doesn't have those?
 
Now I’m getting confused. Lol... I didn’t take a pic of the inside of the cylinder, only the outside after was together. I’m fairly positive mine are rectangular inside and out of the cylinder .
 
Hell, now Im beginning to wonder myself. Wouldn't you be able to see the L shape booster port looking from the outside in like the pic I took of my cyl? If not, maybe Im :confused: loosing it and they are stock.
 
Wouldn't you be able to see the L shape booster port looking from the outside in like the pic I took of my cyl?
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Yeah you should be able to see the very bottom of the booster ports, or with the piston at bottom dead center you should be able to feel them inside. Your pics show the booster slots in the piston so I would think the cyl ports are there.
 
I have never seen L shaped intake ports and such in my opinion an L shaped intake port would be an obstruction to optimum flow through the reed valves into the cylinder. The ports in the liner are quite often L shaped so I think you were confused.
 
He's referring to the booster ports on the inside.

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I think I was confused guys. I assumed you would see the same L shaped configuration from the outside of the ports looking in as you see looking at the inside of a removed cylinder. So when I started seeing the L shaped ports on inside of cylinder pics, I started trippin’. Sorry for the confusion and thanks guys for the responses.
 
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