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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 The previous version was outdated and no longer supported.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!
Today's Whodunnit ...
- Thread starter grouty
- Start date
Crashaholic
Husqvarna
Pro Class
I was in agreement with the previous post that suggested the wrist pin keeper came out but you said that wasn't the problem. From the looks of the extreme damage in such a small area of the piston leads me to guess that something came apart inside the carb or the reed cage assembly before ending up between the piston and cylinder. I've seen seized pistons from lean conditions that didn't do near as much damage as this. Looks like damage from metal debris.
grouty
Auto Lover ...
No, checked the reeds very carefully tonight. They are still perfect. As are all the parts from the reed cage.
Yes Bill, head torqued correctly, and checked again sometime later. Head was lapped. Mixture has been spot on since it was first run.
Stated bore clearance from Wossner is .08mm. This is, as far as I am concerned, too tight. My 390WR 6 speed has just been done to .09mm. The Auto was bored to .10mm over as they run so hot.
Yes Bill, head torqued correctly, and checked again sometime later. Head was lapped. Mixture has been spot on since it was first run.
Stated bore clearance from Wossner is .08mm. This is, as far as I am concerned, too tight. My 390WR 6 speed has just been done to .09mm. The Auto was bored to .10mm over as they run so hot.
ptkatoomer
Husqvarna
Pro Class
Back in the day the husky service mgr used to set up the tolerances quite loose on the Baja winning bikes because they ran them so hard......
grouty
Auto Lover ...
I've just put a new piston and ring in the manual box 390WR after 900 miles. The ring gap with the old ring was .5mm, gap with the new ring is .3mm. It did not need a rebore (just as well as it is 84mm anyway). I repacked the silencer and did a few miles on it this afternoon. At least with a manual box I can keep the rev's down and keep it all sensible. It is a bit harder with the Auto as I can't short shift to keep the rev's down.
The Auto will be up and running as soon as my Kawasaki small end bearing turns up on Tuesday.
The Auto will be up and running as soon as my Kawasaki small end bearing turns up on Tuesday.
grouty
Auto Lover ...
I'm using Lectrons on both my 390's. I will go richer 1/4 turn on the metering rod, and richen the power jet by at least 1/2 turn or more. If it starts to blubber higher up the revs I can come down on that.
The Kawasaki small end turned up tonight, so if I get time later this evening I will put it back together. Running it in before the 28th might involve some extra effort.
The Kawasaki small end turned up tonight, so if I get time later this evening I will put it back together. Running it in before the 28th might involve some extra effort.
Bigbill
Husqvarna
Pro Class
I'm noted for doing midnight runs through the neighborhood with new engines. I rebuilt husqvarna bikes every superbowl sunday and fired them up for a rip after the game.
It's something I tear up about now because my son tells this story it's something he will always remember about me and him and the husqvarna bikes.
I'm a well known husqvarna legend in these parts (in my own mind) with these magnificent Swedish bikes I'm one of the only ones who stuck with the evolution bikes. It's that Swedish fin ring that gets my juices flowing. I can distinguish the sound from all the other bikes.
I rode husqvarna bikes when huskys weren't cool.
I do think about those Swedish blondes........
It's something I tear up about now because my son tells this story it's something he will always remember about me and him and the husqvarna bikes.
I'm a well known husqvarna legend in these parts (in my own mind) with these magnificent Swedish bikes I'm one of the only ones who stuck with the evolution bikes. It's that Swedish fin ring that gets my juices flowing. I can distinguish the sound from all the other bikes.
I rode husqvarna bikes when huskys weren't cool.
I do think about those Swedish blondes........
stormer254
Husqvarna
AA Class
What happens on the 28th? Just sent of the documents to register my 250, keeping my fingers and toes crossed!
In the end with your seizure are we thinking it was not quite enough clearance round the piston?
In the end with your seizure are we thinking it was not quite enough clearance round the piston?
grouty
Auto Lover ...
No, clearance around the piston was good Steve. A little on the generous side. I just think I was unlucky.
Anyhooo .... Had an hour and a bit tonight, so the motor is all back together, and the carb is richened. Probably a bit too rich, but I can work back from that.
No chance of finishing it tomorrow as it's track recce night at Harberton. Friday evening before the pub may be the best time to finish it and run it down the road. Sunday is Dorset Classic.
Sunday the 28th is a TRF funday at the Harberton track Steve. We will use the scrambles track and all the woods and valley over the back. If you are a TRF member then no issue. If not, and you want to come down, we are allowed one guest each. All bikes must be taxed, insured and MOT'd. Proof will be required on the day.
Anyhooo .... Had an hour and a bit tonight, so the motor is all back together, and the carb is richened. Probably a bit too rich, but I can work back from that.
No chance of finishing it tomorrow as it's track recce night at Harberton. Friday evening before the pub may be the best time to finish it and run it down the road. Sunday is Dorset Classic.
Sunday the 28th is a TRF funday at the Harberton track Steve. We will use the scrambles track and all the woods and valley over the back. If you are a TRF member then no issue. If not, and you want to come down, we are allowed one guest each. All bikes must be taxed, insured and MOT'd. Proof will be required on the day.
motomwo
Husqvarna
AA Class
Grouty, I don't have any experience with the Lectron carbs but every time I ride my autos or any of my other Huskys I always check the weather conditions/stats for barometric pressure, temp, and humidity (this will give me corrected altitude and ADR) and change the main jet to the current weather. If I start riding early in the day the when it is cooler then I know later in the day as it warms up I know I will stay safely on the rich side. My main jet size requirement changes day to day and sometimes the needle clip position, but not as often. For instance on my 81 420 auto I will use anywhere from a 420 to 360 main. I would suspect you probably had the carb tuned correctly from previous days riding and the day the piston seized was a day that the weather conditions required much richer jetting for that given day. I don't think many people realize how much the weather plays a part on the correct jetting. Just food for thought.
Marty
Maybe but Lectrons are very tolerant to temps and elevations. I typically ride 50-2000 feet. Did the Idaho City ISDE this last weekend. It starts at 400 feet and goes to about 8000. Zero issues, bike ran perfect. Everyone else was complaining about blubby rich running. I have many times seen this.
motomwo
Husqvarna
AA Class
Not saying it is the Lectron at all. My point is weather plays a bigger part of carb tuning than any other factor such a the elevation. You can be at 3500 ft and with the weather conditions such as high barometric pressure, cool temps and low humidity the "corrected" altitude could actually be at below sea level! If he had his carb tuned on the lean side to begin with and the weather required much richer jetting then that would be the perfect recipe to seize the motor.
Marty
darren7878
Husqvarna
AA Class
My 390 was/is very sensitive carb/fuel wise. once the fuel went lead free it suffered from some pinking late in motos, where the 250s seem to run fine on the new 'crappy' fuel......