Small Engines (Lawn Mowers, etc.): chainsaws, compression release, high compression

Question
QUESTION: Many older chainsaws seem to have hi compression,to the point of ones hand slipping off starter handle. these saws cannot be pulled thru one full rev. exhaust is open & plug lead disconnected.all turn freely w/plug removed &run well when you can start them, thanks

ANSWER: Hello Bruce:

Many of the Older Chainsaws with High Compression had a Compression Release Button on the Cylinder Head. If an Older Saw is Hard to Start Due to High Compression; Check the Flywheel Key for Damage. If you Hit a Snag or this Does Not Correct the Problem,  I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Thanks.

Respectfully

John

---------- FOLLOW-UP ----------

QUESTION: Thanks for your reply . none of these saws have a compression release.Given the fact that the spark plug lead is disconnected i don't believe a flywheel key sheared or other wise would stop ones efforts mid pull.Lately however i have been thinking that folks might be mixing too much oil in the fuel,perhaps there is a glut of oil sloshing around in the crankcase hmmmm?? Maybe glut is too strong a word.. Thank you Bruce

ANSWER: Hi Bruce:

Have you Made Sure the Exhaust Port and Muffler are Clear of Carbon Blockage? This will Also cause the High Compression Problem. If you Hit a Snag or this Does Not Correct the Problem,  I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Thanks.

Respectfully

John

---------- FOLLOW-UP ----------

QUESTION: thanks for your reply. i've inspected the exh. port & muffer alls clean,also normal carbon on piston top.. have you considered my thoughts on too much oil to gas + rich hi speed needle adj. ?? I have not tested the compression on any of these engs. to compare to a "normal" eng.however i will asap.Thanks you, Bruce

Answer
Hi Bruce:

I have this Scheduled for Thursdays Research. I am Going to Try Different Oil Mixtures to See if this can Cause High Compression. I know that a 16:1, 24:1, 32:1, 40:1 and 50:1 Ratios Do Not Cause High Compression. Theses Ratio's have Been Used in Most 2 Cycle Engines for Years. I have a Old 2 Cycle Mower that Used to Use the 16:1 Ratio and I am Now Using 40:1 (Synthetic 2 Cycle Mix) and Other than Not having to Clean the Exhaust Port and Replace the Muffer as Often; I can Not See a Difference in the Compression. What are the Makes and Models of these Saws? Can you Give me Some Background Information on them, Please. Thanks.

Respectfully

John

PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Thanks.

Respectfully

John