Well, I did it, I tore into my 550xp.

[nmurph]

You can't pull the base gasket on that saw......not without machine work.

I'm pretty certain the last one I did went back together without anything...but, according to my wife, I've been wrong before....If I used something to bump the squish back up, it would have been an aluminum can, good for about .004".

OP, you can use Yamabond 4, Loctite 518 (?), or Threebond 1194 (?). It can be use alone or to coat an aluminum can gasket.

Someone can verify the two with question marks as I use the YB for everything.

 

[redoakneck]

I thought that I had been wrong before, but I was mistaken!!!!

Dodging the #10 from the misses , again!!

Subscribed, great post!!!

 

[Mastermind]

The base gasket is about .025 thick on the 550XP. I'm pretty sure it's a serious head slapper without it.

 

[tlandrum]

I think to pull the base gasket you have to cut the chamber or cut a 10 or 15 thou pop up.

 

[skylogger]

I got this all the way around.

 

[Adirondackstihl]

That's a thick azz gasket buddeh!
STIHL are usually 0.019-0.20"
The Dolmar I'm building now is 0.013.

 

[skylogger]

Well my knuckles are about to bleed that's as clean as the top is gonna get

 

[skylogger]

I'm ready just have to wait till the piston gets here I hope I don't jack it all up.

 

[skylogger]

I got the exhaust port completely clean those dang bumps are just leftover cylinder coating I reckon.

 

[skylogger]

I guess there not hurting anything I don't want o try to sand them off I don't have anything to get that far up there.

 

[LegDeLimber]

Could you give us an inside diameter of the strato tubes on the carb body?
If you list the carburetor body number and the diameters together,
that would help it to be searchable for the folks wanting to compare carbs.

As to those warts in the exhaust port: IF you do try to sand them off,
I would only apply pressure from middle out. I.E. like the exhaust gas flows.

It's just an OCD thing I have, so bear with me.
I'm just thinking that *IF* somehow there's a tiny bit of plating that's trailed off from them
then they *Might* roll and peel back the plating into the cylinder.
Or if they or strongly attached to base metal, they might tear out a little chunk of the port metal
since they are close to the edge/corner.

Yes I can be a bit obsessive at times, but it beats killing a part/cylinder.

 

[old-cat]

I guess there not hurting anything I don't want o try to sand them off I don't have anything to get that far up there.

If you get a little, tiny $2 flat diamond file, you can smooth those bumps without any problem.

 

[LegDeLimber]

Old-cat has a fine idea.
http://www.harborfreight.com/10-piece-diamond-grit-needle-file-set-69876.html
about $8 + shipping.

 

[skylogger]

550xp at-1 249 carburetor .410" strato tubes.

 

[skylogger]

Finally got the parts I'm gonna put it back together when I get home tonight is it ok to reuse the base gasket or should I put some sealer on there with it.

 

[Andyshine77]

if the gasket is clean and intact it will be fine, if you want a very thin coat of appropriate sealant won't hurt anything.

 

[skylogger]

I put a thin coat of spray copper sealant on the gasket got it all put together I'll fire her up tommorrow[emoji39]

 

[skylogger]

Well I fired er up it runs like a scolded dog I love these saws!!!

 

[lone wolf]

More pics.

Not my idea of what is"fine"