Husky 394XP New Project

[WolfMann]

Think I found the issue...might try to just make my own.

 

[Gord404]

Yup, that will do it....been chasing down one on the 394 I'm building right now... casting had a bit of a high spot due to what looks like someone prying on it.

 

[WolfMann]

Well that's a shame, how are you dealing with the high spot? I'm kicking myself for ordering the cheap gasket set, I was fortunate that I had a crankcase gasket left over from my first go at it. That one was much higher quality, the one I got in this new set was already torn in bag. Probably why this base gasket didn't hold up too.

 

[WolfMann]

Speaking of base gasket, I cut one out from a roll of make a gasket, but it dawned on me after the fact that, the make your own material is .2mm thicker than the other stuff. Am I over thinking it or would that have a negative impact on compression?

 

[smcrow]

So I kept fiddling and found out there is an air leak right below exhaust port at base gasket. Going to pop off jug and see what it is.

probably from your crank case gasket sticking up. did you trim the gasket flush after going back together when you did the bearings? if you didn't then i would guess that is the cause of your leak

 

[WolfMann]

What I ended up doing was folding the extra material back and forth a few times and then tearing it off, I suppose it might not have been perfectly flush. I'll try going over the spot with a razor blade to see if I can trim it any better.

 

[Gord404]

Speaking of base gasket, I cut one out from a roll of make a gasket, but it dawned on me after the fact that, the make your own material is .2mm thicker than the other stuff. Am I over thinking it or would that have a negative impact on compression?

If you check your squish there will be your answer, if your not sure how to do that there is plenty of info on it and the goods and bads- mine is about 34 thou. on my latest saw.

 

[Gord404]

So Wolfmann, how did your rebuild go? Never could get that one cylinder to seal properly, think maybe someone was machining it and they were out making it high center, will check it on my own lathe but meanwhile had a ported and polished one and didn't leak a bit just trying it with an old gasket..... cleaned it up and on she went, between that and low restriction muffler she's quite the saw, next on the bench is a 395 with a bad bearing on the clutch side, and a 390 after that.

 

[WolfMann]

Good deal Gord, glad to hear you were able to make it work. I opted to order a new oem gasket set instead of running the one I made, should be in tomorrow, so hopefully I'll have some updates on Tuesday. That's neat that you had a ported cylinder floating around, was there any change to timing on that one?

 

[Gord404]

No change but a very low restickton walker type muffler should be used

 

[WolfMann]

I'm gonna need to look into the walker type muffler, I'm not familiar with that. I'm curious how much did you open up the exhaust port?

 

[cgraham1]

I'm gonna need to look into the walker type muffler, I'm not familiar with that. I'm curious how much did you open up the exhaust port?

Muffler mods are pretty common. You can just open up the stock outlet, or add a second (or third) outlet. It will allow the saw to flow better and keep heat off the muffler and cylinder. You will have to retune the saw when you’re done. If you are cutting on public land, you will need to have spark screens in place.

There are guys on this (and other chainsaw forums) that make ready to use deflectors that can be welded on, or you can use the bolt on style that came on a lot of older saws. @Red97 makes some that I’ve used. Some people drill holes and weld small pipes in for the outlets.

Here’s a couple that I’ve done...

365-372xp Husqvarna. I opened the stock outlet as big as I could and welded on a larger deflector...


I think this was for a 357xp. I just added a second outlet on the side of the muffler...

 

[WolfMann]

Those are sweet Cgraham, so if I'm understanding right a walker muffler is a muffler with an extra outlet or two? I've definitely read about the muffler mods before, just never heard it called a walker muffler. Something new every day huh.

 

[WolfMann]

So I looked it up and found out about Walkers saw shop, think I understand now how a walkerized saw might have extra exhaust outlets but not all modified mufflers are walker mufflers.

 

[cgraham1]

So I looked it up and found out about Walkers saw shop, think I understand now how a walkerized saw might have extra exhaust outlets but not all modified mufflers are walker mufflers.

Correct.

 

[Gord404]

Walkers saw shop is close to where I live so they have been porting and polishing for years and modifying the mufflers, hence being that I'm always getting older large saws in ten to one if it is ported and polished it most likely went through their shop sometime in their life.

 

[WolfMann]

Hey everyone, latest update, got the saw back together yesterday, couple photos below of the last steps of assembly and the finished product. Got a tank of gas through it while brushing around tool shed. Today the plan is to double check pressure/vacuum, and go over everything, making sure it's all tight and bright. I'll update again when everything is finished up.

 

[WolfMann]

Hey everyone, got the saw back on work bench to double check pressure and vacuum, found out flywheel side seal had partly flipped up , pic below, got a new one in, and the saw is now holding perfect pressure and vacuum, will probably finish reassembly tomorrow and go through the run/test process again.

 

[Gord404]

Yes they are a little tricky making sure they go in right.

 

[WolfMann]

New crank seal went in, used aluminum can trick and a fair bit of 2 stroke oil, made sure to set it 5mm deep. Tested good on pressure and vacuum, saw is running great. Got the 36 inch bar on it, and spent a bit of time milling today. Been making sure to keep it at a richer mix, and give it time to cool down after cuts.