372xp - What's wrong??

I found my security torx bits. Woo hoo.

I wonder if the new cylinder comes with this plate already. Why is it even there? For cleaning purposes?

 

I think it’s a cover for the transfer port.

 

It’s easier to cast the cylinder with removable covers. Smear some sealant on the rubber O-ring when you put them back on or there’s a good chance they will leak.

As far as the carburetor limiters go, take a pick and push in the outer ring while you spin each jet out with a tuning screwdriver. You can either grind the tabs off of the metal rings or I heat up a tuning screwdriver and melt the plastic stopper off on the carburetor and then reinstall the jets. Or you can use the proper splined driver to push the ring in and adjust the jets. It’s actually considerably easier than tuning them with a screwdriver

 

And don’t ruin the rubber o rings. The only way to acquire them is find someone that has a spare used set or buy a new cylinder. They aren’t available as an individual part

 

Ah thanks.

The inside of that cylinder was pretty dank. The top of the piston was kind of black and the top of the cylinder too.



And here is the blown up saw's crankshaft. I don't see any bluing so I think it's ok.



And here is the same shot of the donor saw which looks a bit sandy/rusty for some reason.

 

The carbon is normal for some oils. Only thing wrong it looks like is the vertical streak below the exhaust port

 

If the stroke and bore are supposed to be the same why is this piston measuring 48mm? I thought it is supposed to be 50mm.

 

I just went and measured the donor piston and that is show 49.89mm. I think whoever put in that piston did not do the right thing and just used some piece of crap lying around eh?

 

The main thing that matters is that the piston you are using is a good fit in the cylinder you are using...

 

Its a Husqvarna!

 

Because that cylinder is for a 365 special

 

Pre xtorq
365 = open port 48mm (semi pro version)
365 special = closed port 48mm (pro version)
371 and 2 = 50mm closed port (pro)
372xpw = 51.4mm “” “”

xtorq
365 = 50mm strato with restrictions in the transfer covers
372xp = 50mm strato w/o restrictions

 

Thank you for clearing that up.

 

It's a beautiful day when chainsaw parts come in, especially a nice shiny new piston.

 

No removable cover on this jug either.

Just look at this sexyness!

 

The 372xp x-torq does not appear to have those plastic sleeves for the carb bolts.

Is that correct huskihl ?

Both the donor saw and the blown up saw did NOT have those sleeves....but the 372xp (non x-torq) I cleaned DID have them.

And you can definitely see a bit of wigglage in the hole when you slip the bolts in there.

Xp x-torq diagram:



Well I put together the saw and my buddy happened to just stop by so I gave him the honors. It burbled on the first pull. Then started on the next.......

And I was celebrating inside........and then the saw just stalled out.

He was able to keep it idling by playing with the choke.....

But once popped back in the saw would die.

So I took the cover off and quickly noticed I had pinched the impulse line instead of feeding it through the hole in the carb to cylinder boot. Fixed that problem.

Still wouldn't start but I have a feeling we probably flooded it by trying to pull too many times.

The decomp had been working but after this part it wouldn't pop back out. Took the cover off again and noticed a bit of oil coming out of it so just to rule that out I put in the plug that came with the piston/cylinder kit.

I took the opportunity to just double check my work so I took off the muffler, checked the piston and the rings and that looked fine.

Took apart the carb and there was a tiny bit of debris in the screen but nothing that would clog it up. I'm 99% sure I put it back together properly as the gaskets and things only really go one way.

Put it all back together and got it to start and idle for like 25 seconds and then it died again when I blipped the throttle.

If it was still flooded, it wouldn't have started.......so now I'm thinking maybe I should just get a rebuild kit because I just got off the phone with my buddy and *NOW* he tells me that he messed around with the throttle plate so who knows what he did. I may have to swap out carbs with another saw.

 

The rwj boot needs to slip into the carb and it’s easy for it to not line up correctly. Also, there are buttons on the filter elbow that help align the carb. So that’s why the rwj doesn’t use the sleeves

 

It’s easier to mount the boot, carb, and elbow to the cylinder before installing the cylinder

 

I did that - saw afleetcommand do it on YT and that made sense. I just oopsied and forgot to pull that impulse line through.

Waiting for a rebuild kit now.

 

Got the rebuild kit for the carb delivered today. Turns out the kit included a second gasket for the pump side of the carb. The original carb did not have that and neither did the donor carb. Weird.

Had to open up the L jet a bit (counterclockwise) as the saw was initially just dying when I would hit the throttle. Got it to respond pretty well I think. I took a short video of it.

First pic shows the two gaskets - one is under the diaphragm and one is on top. The second pic shows the old carb diaphragm which only had the one gasket below it.



Here's a really short video of it idling away (to break it in) and me blipping the throttle a little.

New piston/cylinder, rings, wrist pin, circ clips
New air filter
New spark plug
New fuel filter