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Old 10-18-2014, 10:43 AM   #1
Tinker1980 OP
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1977 Husqvarna - Time to do some work.

For the past 12 years or so, I've had this somewhat worse for wear '77 Husqvarna WR250 "Cross Country". Great sentimental value to this machine.

It's always ran, and for quite a while ran pretty decent. But recently, I've been noticing low compression, lack of power, harder to start, so on and so forth. Along with the lack of brakes, bad suspension, etc etc etc.

So it's time to fix up my old bike. Shop says the cylinder hasn't been bored before, and I should go to the first oversize due to a scratch. I'm thinking wiseco has the piston kit I need. What else should I look at doing, while I have the top end off? Anything I should pay special attention to?

Lastly, when I pulled the head off, there didn't seem to be an o-ring or a head gasket. Is this normal, or is this machine so old and decrepit that I just didn't notice the head gasket?











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Old 10-19-2014, 07:37 AM   #2
Ever Onward
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If you not splitting the cases, then your kinda limited to what you can see with the top end off......IE , rod wobble and end play. At least measure your rod play so you have a basic idea of crank / rod wear .

I personally would try to source a OEM type piston.......I dont know if OEM was cast or forged. The Wiseco's are forged, and expand differently when heated than a cast piston. Whichever you go with, make sure the macinist is really talanted with a boring bar, hone and has the finess to chamfer ALL those ports !

Thats a crazy amount of porting in that jug. Lotsa labor to do a rebore correctly there.

Since Im not a Husky guy, gotta wonder if those are simple steel sleeve, or some kind of plated liner ?
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Old 10-19-2014, 12:05 PM   #3
daviethebiker
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I don't know about the newer Husky motorcycles but back in the era of your bike the stock pistons are forged. They didn't use a head gasket . The cylinder and head are lapped together with rubbing compound, the same way old aircooled VW heads were sealed to the cylinder.
I would look into replacing the crank seals if they can be replaced without splitting the cases, if aren't splitting the cases.
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Old 10-19-2014, 03:55 PM   #4
Tinker1980 OP
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I'm going to hit up my favorite machine shop about the boring job. A bit of work with calipers confirms that it hasn't been bored. I've only pulled apart a couple of two strokes, and never have I seen this many ports in the cylinder.

Fortunately I have lapping compound leftover from a recent valve job. I will wait until I have the jug back from machining before I lap it to the head.

Still trying to decide if I want to split the cases. Bearings all seem ok, and I think I can replace the seals with the engine in situ. Assuming I can find said seals.

I'm thinking about replacing the bing carb with a mikuni... anyone know which jets I should get?
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Old 10-19-2014, 04:09 PM   #5
JeffS77
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If the bottom end was fine before I would probably leave and just replace crank seals..but that's me.

Sudco can probably sell you one jetted for your bike. Probably wouldn't be a bad idea to get a few richer and leaner from them as well
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Old 10-19-2014, 05:00 PM   #6
Lotus54
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I liked the Bing carbs back in the old days.
But probably harder to find parts now
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Old 10-19-2014, 09:12 PM   #7
Tinker1980 OP
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I liked the Bing carbs back in the old days.
But probably harder to find parts now

I'm sure it was a great carb - back in the 70's. Now it's just a leaking, dripping chunk of aluminum. IF I could find the pieces for it (float, float needle, seat, etc) I'd be willing to use it - simply because it works. I think the next year for this particular bike (1978) they went to a mikuni carb anyway.
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