Jonsered 2153 VS Husqvarna 550XP

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Hey Randy, would you mind modding just the muffler and sticking it back in that log? With what porting didn't do for mine, I really want to know how much the MM did. BTW, I've been in the garage the last couple of hours working on the carb on mine. It's back up and running with quite a bit larger venturi:) It's much too late to make any cuts with it though. It does at least run though.

I found something of interest while I had my carb apart. There's a needle in the face of the carb. Once you remove the filter adapter, it's right there on the left. It's sealed with a small o-ring and is about 1 turn out. I'd sure love to know what it does!

BTW, the exhaust on mine is still at 106°. As low as compression is on these, I'm thinking a squish band mod is in order.

I'm not Randy, at least I don't think I'm Randy, but from my videos it looks like my 550 gained ~25% from the muffler mod.
 
Very interesting so far. As torquey as the 550's appear to be in other vids, I'm surprised at how low their compression is.

If you guys are using 10mm adapters on standard compression gages, you are going to get really low, inaccurate readings. (That's why Husky makes 2 separate gages and stresses that dealers have both on hand.)

When I get to the store later this morning I'll take some readings on a few saws and post some out of the box numbers for you guys.
 
If you guys are using 10mm adapters on standard compression gages, you are going to get really low, inaccurate readings. (That's why Husky makes 2 separate gages and stresses that dealers have both on hand.)

When I get to the store later this morning I'll take some readings on a few saws and post some out of the box numbers for you guys.

I think TZed has an actual 10mm hose and he was still @ only 130 psi
 
:bowdown::bowdown::bowdown: lol

so where can i trade my reps into saws or port work?

and wheres your 346 in this mix?

I traded it for an 046. :buttkick:

I'm not Randy, at least I don't think I'm Randy, but from my videos it looks like my 550 gained ~25% from the muffler mod.

Be glad your not Randy....he's an #######.

That's about what I figure this one should gain......

If you guys are using 10mm adapters on standard compression gages, you are going to get really low, inaccurate readings. (That's why Husky makes 2 separate gages and stresses that dealers have both on hand.)

When I get to the store later this morning I'll take some readings on a few saws and post some out of the box numbers for you guys.

I was wondering about that.......

Thanks Bob.....you are the man ya know.
 
OK, pulled a few saws off the shelf and took some compression readings. I wouldn't conclude that each and every saw would be exactly the same, but I'd be surprised to see variations of more than the 5psi that I had between the two 562's. I don't have my own 550 here at the shop, to see how it compares with 4 tanks of fuel through it.

545: 135psi
550: 145psi
555: 140psi
562: 155psi
562: 160psi

The 545 and 555 do have different combustion chambers vs their XP brothers, so that explains the lower readings on those models.
 
Dammid, I tried to rep some of y'all, was only able to hit Young, need to spread the rep around first.

Questions, because I :dunno::
Are overalls required attire for running a chainsaw?
Are well worn jeans acceptable under certain circumstances?
Should we be thankful that "Birdlegs" Randy wasn't wearing shorts :laugh:?
Is the 550XP unimpressive when stock and not yet broken in?
 
My friend......you are the guy I was hoping to see. :)

LeesStihl038018.jpg


What would raising the exhaust do to the torque this saw makes? :msp_mellow:

That was similar to the reading I got on mine - with 7 tanks of fuel on it. My new gauge has yet to arrive though, I'm still running the adapter - with a leaky gauge at that!
 
Dammid, I tried to rep some of y'all, was only able to hit Young, need to spread the rep around first.

Questions, because I :dunno::
Are overalls required attire for running a chainsaw?
Are well worn jeans acceptable under certain circumstances?
Should we be thankful that "Birdlegs" Randy wasn't wearing shorts :laugh:?
Is the 550XP unimpressive when stock and not yet broken in?

I'm in bibs again today.......they fit fat guys real well......but worn jeans will work. :laugh:

Be thankful I'm not wearing a Speedo.

The 550XP would be fine for me with or without a muffler mod........if I had never ran a well ported saw before. :D

The 550 is VERY impressive with only a muffler mod. I've never run one bone stock.

Well........I ain't impressed......yet. :msp_sad:

I do have videos and pics uploading of the 550 with a muffler mod though.
 
This was the first thing I did to this saw.....I don't own a .325 bar or chain. If this saw won't pull 3/8s I have no desire to own one.

550XP005.jpg


Here's some pics of my muffler mod.....I wanted to be able to figure out something that could be screened.

In the inlet these holes in the baffle seem fine for a unported 50cc saw. I may open them as part of the porting process in the next step, but for now it is unaltered.

550XP006.jpg


550XP007.jpg


This paint looks blushed until it is heated. After a run in it evens out to a nice color.

550XP008.jpg


Yeah this strut moved a little. :(

550XP009.jpg


Close to the brake handle....but not quite touching.

550XP010.jpg


550XP011.jpg
 

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