Author Topic: Muffler bolts 290 310 390 250 etc  (Read 968 times)

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Offline Cut4fun .

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Muffler bolts 290 310 390 250 etc
« on: March 24, 2012, 08:10:14 pm »
Why is it  (even on like new saws) in this series that the muffler bolts like to twist into aka break when removing? Gets old and only think I have gotten through 1 saw without breaking a bolt. Stihl thinks their bolts are made of GOLD for the OEM prices.

Even noticed most of the time if they dont happen to break they loose the threads on the bolt on nut to removal.  Are they  that freaking cheaply made or what.

Just venting on another muffler mod job with broken bolts and threads coming off bolts and having to order more  bolts and nuts.
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Offline Al Smith

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Re: Muffler bolts 290 310 390 250 etc
« Reply #1 on: March 24, 2012, 09:46:02 pm »
I tried to figure out from the IPL of an 029 .If the thing is a stud with the nut on the outside they all jamb up .The danged nut is out there where it gets screwed up being in the air .FWIW the old Macs did the same thing if they were on a stud .

On the Stihls with removable covers and the screws inside they never jamb up .

It's about the same as an exhaust manifold on a car engine .The ones with studs and nuts you have a deal of time removing them ,Usually a bolt thread into the head comes out easier .

About the only cure I can think of is brass nuts if you can find them in metric .FWIW the old Caterpillars used brass nuts on the manifolds .

Offline Cut4fun .

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Re: Muffler bolts 290 310 390 250 etc
« Reply #2 on: March 24, 2012, 10:02:16 pm »
I dont have the 310 bolts for a pic right now. But here is a set of similar smaller 025 bolts.
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Offline man of stihl

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Re: Muffler bolts 290 310 390 250 etc
« Reply #3 on: March 24, 2012, 10:22:21 pm »
Can you hit them with Blaster before removal? I have only worked on 1 290 series and it was a carb and fuel line issue. I dont much care for those models.
Ron

Offline Al Smith

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Re: Muffler bolts 290 310 390 250 etc
« Reply #4 on: March 25, 2012, 04:53:53 am »
I suppose you could heat the nuts with a torch .You'd have to use acetylene because propane wouldn't rise the heat fast enough .

About the only type anti sieze that would work I can think of would be a product called Lead Pate but I'm not certain they still make it anymore .Never Seeze might work but a muffler bolt gets pretty hot .

Offline Cut4fun .

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Re: Muffler bolts 290 310 390 250 etc
« Reply #5 on: March 25, 2012, 09:21:40 am »
MOS, tried the PB blaster on this one.  Still  ::)    I think it is just a way to get $4+ a bolt.   

On the P 500 5000 muff bolts if one broke I could make one. But being a customers MS 310 saw and in like brand new cond it's got to go back oem.

Let just say the stihl guys dont like getting their arse handed to them by yellow wth is that 49cc 55cc partners and yellow and lime green 330 3450 3750 54cc 60cc poulans. LOL   None were muffler modded either.  :D
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Offline Cut4fun .

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Re: Muffler bolts 290 310 390 250 etc
« Reply #6 on: March 25, 2012, 12:14:33 pm »
MM done just got to wait on freaking bolts and nuts now.  >:(  Cant do carb re-tune till I get then grrrr.

Guess I will go sharpen his chain. To think he told me he had just sharpened it.  :o   ( I tested it stock as came in to see).
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Offline man of stihl

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Re: Muffler bolts 290 310 390 250 etc
« Reply #7 on: March 25, 2012, 12:22:44 pm »


Guess I will go sharpen his chain. To think he told me he had just sharpened it.  :o   ( I tested it stock as came in to see).
Another reason he cant keep up with the Partners? :-X
Ron

Offline Cut4fun .

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Re: Muffler bolts 290 310 390 250 etc
« Reply #8 on: March 25, 2012, 01:47:13 pm »
Not pretty but functions really well IMHO. I have seen 23% gains on just a 290 with this simple caveman muffler mod.  Takes about 30mins IF the freaking bolts dont break or the  :-X :-X :-X threads strip off.


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Offline man of stihl

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Re: Muffler bolts 290 310 390 250 etc
« Reply #9 on: March 25, 2012, 01:59:55 pm »
Whats theoriginal holes? the 3 slots to the right?
Ron

 

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