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 The previous version was outdated and no longer supported.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

CR400 piston question

Picklito

Picklito

Husqvarna
Pro Class
Pretty simple: Is there supposed to be an intake window on the non-reed 72-74 CR400? My piston doesn't have one.
 
Thanks, auto.
So, can anybody supply accurate dimensions of the port? Or I'd purchase a junk piston to measure from.
 
Thanks Gary. Got my vintage bike to the point of test firing but couldn't get it to fire. After checking EVERYTHING, I just happened to notice there's no window in the piston. How does that happen? And how am I going to fix it!
 
If you are looking through the intake, the boost port (we used to call it a "pop" port) will not be visible. The intake is timed off of the lower edge of the rear piston skirt. If you're looking at the piston removed from the cylinder, it should be there. Even if the port was missing from the piston, the engine should still start and run, although probably not perform as well as it can.
 
Thanks SteveJ. Lifted cylinder, has port. I was both happy and disappointed. In the photo the bore looks roached. It's not. Actually has great crosshatch. Now I get to scrape gaskets for nothing.

IMG_7303.JPG
 
I get to scrape gaskets for nothing....got to agree there....that's a real frustration...sort of like .."did I leave the light on?:thinking:..i'll turn it on to check!!"
 
I'm using a thin Cometic to set the deck height. Great gaskets, but they become fuzz when you lift the cylinder.
 
my '74 400 doesn't have one and I was assuming that the piston (Mahle) marked at standard bore was original :banghead:
 
Picklito said:
Well that's interesting. How does it run?
Click to expand...

Can't tell you yet! Bought as a "used to race / run" just needs a carb clean, etc. and have been going thru it (clean, derust, regrease). I messed up one of the piston spacers, which is keeping me from reinstalling top end.

By the way, thanks for your thread on your restoration! Very inspiring :cheers:
 
Well, I got her fired up tonight, and she sounds AMAZING!! Not sure how, but I had apparently put the worn out ring in there. Gap was .032." According to the manual, that's the service limit, but I just couldn't start it. A new ring right out of the package dropped in at .016"... compression is noticeably better, and she started. I've not owned a non-reed engine before this, and I didn't expect the idle quality and throttle response to be this crisp! In fact, she's just a little bit scary... just about perfect.

All I can say is... Thanks for tolerating my idiocy on this one!
 
Wrong piston for that cyl.
If it runs that clean and good probably has air leak and lean.
The ring locating pin looks to be running thru the rear port if so can snag and make a big mess real quick.
Later George
 
Thanks George. I see what you mean about the ring, it does look like that in the photo. I'll take a look. Where does the "correct" piston have the pin? Right in the rear center?
 
Something just didn't look right to me on your photo.
need more pics, looks like you have an early motor pre reed say 72-74. Cyl you have could be 360-390 reed.
All reed motors were die cast mag your cases look like cast alum, all reed motors had the clutch cable lug on LH side of motor yours is on RH side.
From the pic he bore looks bad.
Later George
 
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