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 The previous version was outdated and no longer supported.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

Cough stall / backfire then no compression??!!

Tetley

Tetley

Husqvarna
AA Class
I was out on my TE450 on one of the most dangerous and remote trails in Wales yesterday, and halfway through I cough stalled the bike, and it spat back through the throttle body as it often does. I tried to restart the bike, and it had absolutely no compression. Massive panic, as if you break down here, you leave the bike behind unless you have a lot of helpers and ropes - its littered with deep peat bogs that can, and have swallowed bikes never to be seen again.
Anyway, I was thinking it must have a stuck valve, as surely major mechanicl failure can't happen on tickover. So just before the battery died, and was then going to remove the cam cover, she suddenly burst into life and ran fine for the rest of the day!
All I can think that happened, was the backfire blew an inlet valve open, and a shim partially popped out, jamming the valve open a bit?
Anyone had anything like this happen before, was it a one off freak incident, or a sign of looming problems?
This is the third breakdown within a year (dirt in fuel injector, and mud in fuse carrier which both required a tow home), and I'm starting to loose faith in the bike.
 
Hi Tetley


Not sure what that may be but let us know how many Ks you have done and servicing etc.........

Have a look at my wiring thread

There is plenty of pics for you to look at
Reply soon for more help
 
Bike has done 9,000 miles, tappets always spot on, oil just changed etc. This is definately a mechanical issue, not wiring, as the bike had absolutely no compression for about 5 minutes. The only thing that this could be is a valve that is not seating. Anything else eg broken piston / rings, cracked head etc would not have rectified themselves.
The big question is what was jamming the valve, and will it happen again? I'm running 2 trains of thought here, 1. A shifted tappet shim, and 2. The backfire broke something inside the throttle body that got sucked in and jammed the valve open.
 
Tetley said:
something inside the throttle body that got sucked in and jammed the valve open.
Click to expand...

Check your intake manifold boot, the metal ring inside the rubber boot broke and pieces of rubber passed thru my engine, I think. Could have been a piece of intake manifold jamming a valve open and then it slipped out.

HuskyBadIntake1_zps2475399f.jpg
 
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