What causes Jonsered CS2186 to not “four stroke”?
- SSusan ScottSep 13, 2025
If your Jonsered Chainsaw will not “four stroke”, check for a blocked tank ventilator, fuel filter, or fuel line. Also, inspect for a loose or faulty fuel pipe, a leaking or blocked impulse channel, or a loose cover on the carburettor’s pump side. Other potential issues include a faulty pump diaphragm, a leaking intake hose (rubber), loose carburettor mounting, a control system set too low, a leaking or incorrectly assembled control system, or a loose or hole/leaking diaphragm.







