• 4 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     TE = 4st Enduro & TC = 4st 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.

    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 The previous version was outdated and no longer supported.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!

310 oil return

MZee

MZee

Husqvarna
AA Class
Removed the tank to open up the red trumpet & get ECU awakened. I discovered the oil vent tubes going into the frame backbone. (I just want to get an understanding of this oil & vent system). One hose goes to valve cover. One hose goes to air filter boot. One hose comes from oil screen at bottom of engine. Hose to air boot mus be vent & for oil vapor emission control. Does the backbone also act as an oil reservoir for the oil coming from the engine oil screen, & then return down thru the valve cover? This means that the valve cover hose is both a return and vent, which seems to be an opposing flow of oil (down) and crank case vapors and blowby (up / out). Am I correct, or missing something?
 
Return is the long hose going to the sump. Valve cover hose is the vent from the engine. Hose going to the air box is the breather. Get the oil return kit from ZipTy and eliminate the return to the sump before the hose comes off and you lose all your oil.
 
Originally I thought venting the oil hose into the intake was a bad design solely for emissions, but if you ever went through deep water the hose is protected from sucking up dirt and water into the motor. At least the intake is sealed and protected and in effect becomes a closed system.
 
Yes they do, but there are no emission concerns and they are not designed to run in certain enduro situations like deep water crossings.
 
joedirt said:
doesn't the 4 stroke jap mx bikes vent hose just point towards the ground.
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Many bikes are and all kinds of dirt is sucked up through the hose. Adding a small amount of vacuum to the system and keeping the hose end clean is a really good idea.
 
Mike-AK said:
Return is the long hose going to the sump. Valve cover hose is the vent from the engine. Hose going to the air box is the breather. Get the oil return kit from ZipTy and eliminate the return to the sump before the hose comes off and you lose all your oil.
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I still dont see the purpose or need for the hose that goes to the bottom of cases. If it is a return, the only thing it has to return is condensed oil vapors from the valve cover vent. Wont those get returned thru the valve cover hose & the vapors get sucked into the air boot? Why not eliminate the bottom hose & cap off the fitting in the cases? Regarding the ZipTy oil return: it looks like it may make it difficult to remove the cap to add oil. Is it a swivel elbow?
 
Use a gear oil pump. I use one for a boat, that way it has a screw on cap at the end of the hose. Walmart has them in the boating section.

image_18737.jpg
 
Tinken 2 questions... 1.) Is there a way we can be notified when the new design is ready? 2.) If the oil is now routed back through the fill hole, why the necessity of keeping the pre-filter.. I kinda assumed it was a filter for the returning oil from the top-end? What would it do sitting by the drain plug? Just curious...
 
"If the oil is now routed back through the fill hole, why the necessity of keeping the pre-filter.. I kinda assumed it was a filter for the returning oil from the top-end? What would it do sitting by the drain plug? Just curious... "

The tech/service manual shows the inside of the right case. The filter is pre oil pump as you can see the oil gallery prior to the stub that feeds the pump. I wondered about this as well but appears there is no filtration for anything coming down the breather hose.

zoil.JPG
 
Johnrg said:
"If the oil is now routed back through the fill hole, why the necessity of keeping the pre-filter.. I kinda assumed it was a filter for the returning oil from the top-end? What would it do sitting by the drain plug? Just curious... "

The tech/service manual shows the inside of the right case. The filter is pre oil pump as you can see the oil gallery prior to the stub that feeds the pump. I wondered about this as well but appears there is no filtration for anything coming down the breather hose.
View attachment 42494
Click to expand...

That is correct!

I asked the same question to the guys at Zip Ty because I happen to have a magnetic drain plug from another bike that fits perfect.

So I said: "why don't I leave the screen out and use my magnetic plug?" and the reply was: "don't because the oil pump sucks oil from inside that screen!"

It is enough to convince me to leave the screen in place!!!

And you are right again about the stuff that comes down from the frame backbone going straight into the oil pump unfiltered! In my opinion another reason to use Zip Ty's drain back kit.
 
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