all of the changes

include/FluidSim/TwoStrokeConfig.hpp

@@ -13,7 +13,10 @@ struct TwoStrokeConfig {
     float trapped_compression{8.2f}; // exhaust-closure volume / clearance volume
     float transfer_duration{130}, exhaust_duration{190};
     float transfer_width{.050f}, exhaust_width{.036f}; // summed effective window widths
+    float jet_scale{1.f}; // multiplier on effective jet diameters
+    float crankcase_clearance{150e-6f};
     float carburetor_diameter{.0381f};
+    float idle_slide_opening{.045f}; // fixed mechanical stop, normalized 0..1 (4.5%)
     float minimum_burn_seconds{.0008f};
     // Empirical mechanical FMEP = A + B*mean_piston_speed + C*speed^2.
     // Generic correlation estimates, not a measured YZ125 coast-down fit.