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 The previous version was outdated and no longer supported.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

Boiling Fuel

shilo020

shilo020

Husqvarna
AA Class
Yesterday I was riding up a long rocky single track at 100 degrees and was about 7 miles in when my bike started to run terrible. Idle speed fell to 1000 and would not rev at all. Stopped and smelled gas. Looked at the bike and gas was SPRAYING out the the fuel pump/tank gasket. Now I know that IMS tanks leak but mine has not in two years. I took of the gas cap to see if any gas left and to my HORROR gas fumes come rushing out under super high pressure and the gas was BOILING.

After a half hour to let the gas cool I took the tank off and tightened up the screws to the pump, although they were not loose. Lots of fun to do on the trail esp cause the tank interferes with my nice Motorsportz steering stabilizer. Now the bike ran fine. I had no more overheating problems or leaks.

I did not like sitting on a Air/Fuel bomb.

Any ideas on why it got so hot and how to keep it cool? Should I use an open vent tubing?

My bike has only been hot once before because the water pump was broken. Also just placed in waterless coolant about 500 mile ago.
 
Do you have a vent line on your gas cap? If not, an open vent line routed through the head tube or down the frame below the exhaust would be my first recommendation. You might also want to consider some adhesive-backed aluminum foil on the underside of the tank to reflect away some of the heat from the engine.
 
Those things are bad news (as you have discovered). Chuck it in the trash and run an open vent line.
 
shilo020 said:
I had a mx style shorty vent cap that replaced the stock vent/check tubing.
Click to expand...
Ditch that thing, that check valve will stick and cause your tank to blow up like a balloon. My gas has boiled in the past but I think it was running way too lean so the bike was very hot (bad ECU).
 
The cap itself has a check valve in it. I have seen them stick on 2 different 310Rs. I replaced my cap with one from an older 250 after I heard pressurized air escaping when I loosened the cap.
 
also in case its not mentioned get for example CV4 tank insulator "tape" sticker whatever they call it. It seems to work well at reflecting at least some of the hot engine heat from the bottom of my tanks. Yes I have seen my friends clear tank vent with fuel bubbling up through it on a hot slow trail day, I'm sure mine was doing the same, just couldnet see it with the black hose.
One time I had a nogo start until we sat in the shade for awhile and let my machine cool down . It was definitely because of fuel tank boiling, fuel pumps dont like bubbly fuel.

http://www.cvproducts.com/Powersports/Products/Thermal Products/Thermal Film/
 
I've found between the heat of the engine on a hot day , the color of the tank (black being worse than clear) worse if you are in direct sunlight, and the closeness of the fuel pump/tank to the cylinder head on the 4 strokes , the best cures are insulate the bottom of the tank with that reflective adhesive backed heat shield available from several sources , toss that shorty vent tube and run an open line down the steering stem or frame tube below the exhaust , and I've actually removed the check valve in the stock cap on several of the bikes I've owned after looking down at the tank(seeing it was bulging) and realizing that the tank check valve was stuck in the closed position and wouldn't allow the tank to vent , pressurizing the entire fuel system. The down side is if you drop the bike upside down it will leak fuel through the vent line without the check valve in the vent cap .
 
shilo020 said:
robertaccio, should I use any kind of valve in the tank vent? The green stock one? Mr Stiffy? Or go with open vent tubing?
Click to expand...
No nothing odd my bikes are always stripped of BS-check valves etc..
I just have the hose, the only vent device is whats part of the gas cap oriface vent design.
Also makes no difference here, but FYI I always run and extra long hose off my cap vent and run it down near my engine inside the front area my skid plate("frame tube below the exhaust") I have a habit of pulling off the hose from the cap when fueling and lube it from time to time for an easy pull off. I never run vent hoses into the center of the steering stem it tends to wash out the grease to some extent.

PS both my 2011 TE and 2013 TXC have CV4 insulation stuff on them, the stuff goes on well and stays on. Truth is its kinda fun putting it on, ya gotta cut it into shapes that fit the sections of the tank and think of the best puzzle way to overlap the stuff.
 
I'll go ahead and post this here, not that anyone else has a system like mine, but it was interesting to realize I had a fuel overflow system when I boiled my tank that one time. I now only put 1 gallon of gas in my 1.4 gallon rear tank so that I have a buffer of space in case gas in my main tank wants to expand. So my entire system is vented thru a WD40 straw on the rear tank. And when the bike is on its side, only a very little gas can escape thru that small straw.

HuskyFuelBreatherSystem_zps86e73cf6.jpg
 
Go find a local speed shop for auto racing accesories. Get the stick on thermal sheets. Line the whole bottom of your tank and front by radiators. Also, wrap your ecm and fuel line with a layer. Your good to go as long as your vent works.

Stuff is alot cheaper than going thru motorcycle shops.
 
Thanks. I'll do the heat shielding and open vent tubing. And maybe on super hot days consider "coolant" for myself instead of riding.
 
Came home from work and noticed fuel dripping from my 09 te450. Came from around the fuel pump gasket. When I spun off the gas cap alot of pressure came out. No riding and the bike was just sitting in a fairly hot garage. Have the stock green one way valve on. Do you think that a stuck valve caused this?
 
yup its the stubly valve, ive got one but i always leave my tank empty as i came back one day to see the shrouds sticking out, opend cap an tank shrank by an inch or so, should of heated it up to enlarge my capacity.... long hose or leave cap off when in garage or shed.
 
You must log in or register to reply here.
Back
Top