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 The previous version was outdated and no longer supported.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

1984 Husky 500xc with 390 motor restoration.

W

Willie71

Husqvarna
A Class
I am restoring (sort of) a 1984 500xc, and plan to go vintage racing with my son this spring. I am missing the cylinder and head for my 500, but have a near complete 390CR motor from a 1979CR. I am missing the head and pipe, but have the head coming from ebay. My cylinder is original bore, but it was cpseized, so it gets a new piston and overbore. am using the 390 motor as the 500 will be too much for my son, who is a novice at motocross, but in his teens, was a competitive BMX racer who was a strong intermediate. We rode mostly offroad in the mountains when he was a kid. I raced MX before I had him.

My first question is: do the 390 motors need any type of head mod to run on modern fuels? If they do, I’d rather do it now while it’s apart, then have to redo a bunch of stuff a second time.

Second question: Is there and recommended porting changes while it is apart? I never owned a 390, other than one given to me as a basket case that I rebuilt and sold in the late 90s. I read great things about them.

I will be making a custom cone pipe for the bike. I have a software package to design a pipe. I need to get the piston first, and measure the port timing to do this though.

Pics soon. I need to figure out the best way to post pics here and will upload shortly. I will be racing one of three bikes, a 1983 Husky 510TX, a low hour original in unrestored condition, a 1982 KTM504, or a 1982 Honda 500 with a 1985 husky frame.
 
Pretty cool! I have an 86 510 I'm working on. So you like the big bore four bangers? Lots of work on a tight MX course but !Holeshots!
 
Eurofreak said:
Pretty cool! I have an 86 510 I'm working on. So you like the big bore four bangers? Lots of work on a tight MX course but !Holeshots!
Click to expand...


Vintage racing is great for open four strokes. Long straights, sweeping turns, no huge jumps. I rode four strokes most of my life, except a couple husky 500s and a Honda 250. Husky knew what they were doing when it comes to natural terrain motocross. Supercross, not so much. My 83 510 is my favorite bike ever.
 
Cylinder head arrived today. I found some porting specs for the 390, and will get to grinding this weekend. I will measure out the port timing, and get the pipe cone dimensions calculated.

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