New Chain Sticking

[Justjames1961]

Hi all, wonder if someone can point me in the right direction here.

Fitted a new chain to my MS 251 and it runs fine for about 30 seconds or so, then it jams in the bar.

Saw is oiling fine, it's meant to be a genuine Stihl chain, thought bar was past its best so tried a new bar as well, same thing happens.

Put old chain on and runs fine. Confused .com???

[Will Heal]

Is the new chain a thicker gauge than the old?

[Justjames1961]

Is the new chain a thicker gauge than the old?

 

I don't think so, it's meant to be the correct chain, 1.6mm.

[wisecobandit]

The bar should be stamped with the correct chain size etc to use then compare it to the chain.

Theres normally a number stamped on the chain you can google if it doesn't state which.

 

It certainly sounds like a chain issue if your old ones where fine with it. Take it you've done the obvious and cleaned the bar groove etc.

[C.J]

What pitch is your new chain ?

 

0.325" or 3/8"

[spudulike]

I have seen 0.325 used on a 3.8 sprocket - bit of a mess:001_rolleyes:

 

Check gauge and pitch!

[Justjames1961]

What pitch is your new chain ?

 

0.325" or 3/8"

 

325, when off the info on the bar.

Yes bar grooves all clean.

[wisecobandit]

You need to check the kerf.

Theres the latest .043 micro then theres .050 .058 and .063

 

There are the 4 above different widths now available for .325 chain

 

Sounds like you have the next width up from what your bar is meant for. As mentioned previously it will be on the bar.

[Justjames1961]

You need to check the kerf.

Theres the latest .043 micro then theres .050 .058 and .063

 

There are the 4 above different widths now available for .325 chain

 

Sounds like you have the next width up from what your bar is meant for. As mentioned previously it will be on the bar.

 

Ok what it says on bar is .325 1.6mm 0.063 68 link.

[TGB]

I presume that's the info off the bar. What did it say on the chain's box?