sevensandeights
ArboristSite Operative
Just wondering how often you check cylinder bolts? Do you do it routinely? Torque to spec or guesstimate? Threadlocker?
I upgraded to a 79cc p&c on my Makita 6421 about 20 tanks ago. Upgraded to the HD air filter about 2 tanks ago. After the air filter change, I noticed some intermittent lean conditions with erratic idle but saw was still running strong and plug looked good. Retuned the carb thinking the new filter changed something and ran another tank through and everything seemed OK. Went to use it a few days later and fired right up but was racing really fast - knew something wasn't right so I shut it down. Today I cleaned the carb, pressure/vacuum tested the tank and fuel filter. Saw wouldn't stay running for more than 5 seconds - seemed to be starving for fuel. When checking the spark plug I noticed the entire cylinder was rocking when I pulled the starter rope. All 4 cylinder bolts were really loose!!!
Suggestions so this won't happen again?
I upgraded to a 79cc p&c on my Makita 6421 about 20 tanks ago. Upgraded to the HD air filter about 2 tanks ago. After the air filter change, I noticed some intermittent lean conditions with erratic idle but saw was still running strong and plug looked good. Retuned the carb thinking the new filter changed something and ran another tank through and everything seemed OK. Went to use it a few days later and fired right up but was racing really fast - knew something wasn't right so I shut it down. Today I cleaned the carb, pressure/vacuum tested the tank and fuel filter. Saw wouldn't stay running for more than 5 seconds - seemed to be starving for fuel. When checking the spark plug I noticed the entire cylinder was rocking when I pulled the starter rope. All 4 cylinder bolts were really loose!!!
Suggestions so this won't happen again?