So I got a little carried away rebuilding the carb on my Echo trimmer tonight. Actually this is more of an upgrade... like a true phase 1 mod to the intake...backed up by real flowbench data from Team FAST.
1. Removed and trashed the OEM EPA non adjustable carb, in favor of an old school Zama C1U from the stash.
2. Machined a custom punch from tool steel to install a funky shaped welch plug.
3. Installed a rebuild kit and set the pop off lever height with a gage to the rich side.
4. Installed a stainless low profile screw on the throttle butterfly (improves flow across the throttle butterfly section)
5. Replaced all hardware with stainless or alloy socket head cap screws.
6. Installed match ported intake manifold onto cylinder
7. Added billet velocity stack (with choke plate!)
8. Completed the ensemble with a nice high flowing, yet effective K&N style air filter (washable).
Combined with a free flowing ported box muffler (also flowbenched), this is now one baaaad trimmer!
Phase 1 complete
Phase 2 is over there on the workbench...
1. Removed and trashed the OEM EPA non adjustable carb, in favor of an old school Zama C1U from the stash.
2. Machined a custom punch from tool steel to install a funky shaped welch plug.
3. Installed a rebuild kit and set the pop off lever height with a gage to the rich side.
4. Installed a stainless low profile screw on the throttle butterfly (improves flow across the throttle butterfly section)
5. Replaced all hardware with stainless or alloy socket head cap screws.
6. Installed match ported intake manifold onto cylinder
7. Added billet velocity stack (with choke plate!)
8. Completed the ensemble with a nice high flowing, yet effective K&N style air filter (washable).
Combined with a free flowing ported box muffler (also flowbenched), this is now one baaaad trimmer!
Phase 1 complete
Phase 2 is over there on the workbench...