• 2 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     WR = 2st Enduro & CR = 2st 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 The previous version was outdated and no longer supported.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!

125-200cc Jetting issues with the TMXX - aware of the jet block gasket failure?

KTM Talk won't let non-members view the page linked above.

Is there some way to paste the pertinent information here?

Heath
 
I started that thread. There is a rubber gasket under the jet block that has been failing. It appears to be squeezing out and messing up the idle/off-idle circuitry. It may well be why some riders love the Mikuni while others can't get it to run worth a darn. My own 150xcw ran very will with just the usual jetting, then began getting funky after several months. A carb teardown showed that the jet block gasket had failed. The part is not shown on the fiche so no way to order it. I fixed it (made my own) and the bike ran well again. Several of us on KTMtalk have been working on solutions that don't require a homemade gasket, and Cometic agreed to produce a replacement. There is now a rubber-metal-rubber replacement available from Cometic. These pics show what was in my carb when it was acting funky.
IMG_8524.jpg
IMG_8525.jpg
 
I assume that as the japanese bikes sharing this carb, the HVA's have the single-hole-design and the gasket doen't fail as fast as by the KTM's.

jeanjean
 
Glad to hear that an aftermarket company has stepped up to help.:cheers:

I hope they will show a part number for it on their website soon.
 
You can buy the prototype now, available 10, 14, 20 thou thick. It's looking like the 0.014" will be the way to go, as most of the jet blocks are recessed .010-.011":

CB559010RC
CB559014RC
CB559020RC

The other VERY common failure in the Mikuni is the O-ring for the float needle seat. It shrinks, cracks, then leaks and your fuel level is too high. Check it out!
 
Picklito said:
You can buy the prototype now, available 10, 14, 20 thou thick. It's looking like the 0.014" will be the way to go, as most of the jet blocks are recessed .010-.011":

CB559010RC
CB559014RC
CB559020RC

The other VERY common failure in the Mikuni is the O-ring for the float needle seat. It shrinks, cracks, then leaks and your fuel level is too high. Check it out!
Click to expand...
O ring failure has been an issues for decades on various Mikinis.
 
O ring failures as well as gasket failures became common since ethanol showed up in the fuel... so yes a really long time.
 
Picklito said:
I started that thread. There is a rubber gasket under the jet block that has been failing. It appears to be squeezing out and messing up the idle/off-idle circuitry. It may well be why some riders love the Mikuni while others can't get it to run worth a darn. My own 150xcw ran very will with just the usual jetting, then began getting funky after several months. A carb teardown showed that the jet block gasket had failed. The part is not shown on the fiche so no way to order it. I fixed it (made my own) and the bike ran well again. Several of us on KTMtalk have been working on solutions that don't require a homemade gasket, and Cometic agreed to produce a replacement. There is now a rubber-metal-rubber replacement available from Cometic. These pics show what was in my carb when it was acting funky.
View attachment 93255
View attachment 93256
Click to expand...
Hi There,
Does this apply to the 2012 wr 300 ?
 
It would apply to any Miknui of same design, but we oddly hadn't heard much about it until KTM/Husky released the 17's with Miks. Can only speculate why that would be. I've now installed several of the Cometic gaskets with no further issues.
 
Finally got around to checking mine. Yup gasket was bad. Also found my main jet laying n bottom of bowl! Explains the sudden massive spooging issue that developed at the end of last ride. Blubbering bad at WOT. Will take her ouT tomorrow for a test run.20190420_141009.jpg
 
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