Chainsaw compression

[Mik the Miller]

What is the ideal compression for a Stihl chainsaw, can I presume that they are different (ie an 066 will be higher than an 024 for example) ?

 

Is there a 'look-up' table somewhere ?

 

When this is low is this due to ring wear or barrel wear ?

Will changing the rings bring it back up or do you need a new topend ?

[spudulike]

What is the ideal compression for a Stihl chainsaw, can I presume that they are different (ie an 066 will be higher than an 024 for example) ?

 

Is there a 'look-up' table somewhere ?

 

When this is low is this due to ring wear or barrel wear ?

Will changing the rings bring it back up or do you need a new topend ?

 

 

There is month real info available, larger saws tend to make a little less than smaller ones, I personally fit a new piston to restore compression as the bore wears very little and the piston generally wears more!

 

150psi is OK, 170psi is better, under 145 and you probably have issues!