390xp carnage

[duramax99]

Anyone ever see a 385 or 390 snap a rod? Piston and cyl have very minor damage. The rod took a small chunk of out the cylinder extension and piston skirt. Cylinder bore and the piston are mint no scoring no dings nothing....View attachment 297661View attachment 297662View attachment 297663

 

[stinkbait]

Awesome!

 

[sarge3604]

you deserve an award for that

 

[ELECT6845]

To much nitro methane. Breaks rods everytime.

 

[adam32]

Looks like a case of Chinese Steel...

 

[duramax99]

Oem crank not a Chinese knock off

 

[Officer's Match]

Still, the rod looks as though it was defective.

 

[o8f150]

To much nitro methane. Breaks rods everytime.

to many beans will do it:hmm3grin2orange:
that's nasty damage,, I have never seen that before

 

[duramax99]

Yah its the first one ive seen break like that most of them end up like this....View attachment 297669

 

[blsnelling]

Ouch. That's painful to look at.

 

[Adirondackstihl]

That'll buff right out :msp_thumbup:

 

[ernurse]

did that happen under load.

 

[duramax99]

Yah, happened in the cut

 

[blsnelling]

What kind of life had this saw had? What kind of RPMs was in turning?

 

[Mastermind]

Did it still have the limited coil on it?

 

[blsnelling]

Did it still have the limited coil on it?

Don't be tryin' to scare me now I'd hate to see my baby looking like that:msp_scared:

 

[stihlavarna]

Any idea what cause it? This saw is the next one on my wishlist.

 

[duramax99]

Built it for my brother in law last year, west coast faller so its got a few hours on it now. Non limited coil tuned to 14,000 .wasn't running lean at all a hair rich if anything.

 

[Mastermind]

Built it for my brother in law last year, west coast faller so its got a few hours on it now. Non limited coil tuned to 14,000 .wasn't running lean at all a hair rich if anything.

It's an odd break........but I've seen rods broke just like that before.

That saw was limited at 13,000........I tune them to 13,500 using a 346 coil. Impossible to say if the rod was bad or what though.

 

[SkippyKtm]

Any idea what cause it? This saw is the next one on my wishlist.

Probably too much rpm...
Limited coils are good for the people who just look at a chainsaw as just a "tool". It keeps them from over revving the saw from bad carb tuning. My bud who owns a small logging company with a couple of guys working for him has yet to break a 372 crank that had a blue coil in it. His guys were always able to burn up/break cranks that didn't have them.