16024-ZB9-005 Honda SCREW SET, DRAIN (CARBURETOR NO.) (Honda Code 4006458).

Introduction
The following procedure describes installation for the 419-0893 Solenoid Valve Gp .The new solenoid valve group seals the gas supply from the engine during shutdown at high operating pressures. Sealing the gas at high operating pressures reduces restarting difficulty, or backfiring.Required Parts
Tables 1 contains the parts needed for installation of the solenoid valve group.
Table 1
Qty    New Parts    
2     0S-1625 Bolt    
2     1A-8537 Bolt    
2     2H-3743 Bolt    
8     4K-0367 Full Nut    
16     5P-8247 Hard Washer    
2     5P-8250 Washer    
6     9X-8881 Bolt    
2     9X-8883 Bolt    
1     419-0893 Solenoid Valve Gp    
1     419-6617 Tube As    
2     420-8789 Gasket    
1     424-1117 Bracket    
1     424-0851 Flange    
2     425-3549 Gasket    
1     443-7245 Bracket    
1     443-7246 Tube As    Disassembly
Shut down the engine and shut off the gas supply to the fuel lines.
Purge fuel from the fuel lines and gas shutoff valve.
Remove the current gas shutoff valve (GSOV), fuel piping, fuel heater core, and fuel heater core bracket from the engine.Set aside the fuel heater core and associated hardware for reuse.Installation
Illustration 1 g03655254
Typical G3508 ULB with the 419-0893 Solenoid Valve Gp (GSOV)
Illustration 2 g03655255
Typical G3512 ULB with the 419-0893 Solenoid Valve Gp (GSOV)
Illustration 3 g03655257
(1) 443-7246 Tube As
Apply sealant to the threads of tube assembly (1) .
Install tube assembly (1) the pipe tee, so that when the fuel cooler core is installed the connection flanges are positioned horizontal.
Illustration 4 g03655916
(2) 424-1117 Bracket
Install bracket (2) onto rail with the original hardware. Leave the bolts loose so the bracket can slide to facilitate mounting and installation of fuel heater and bolts.
Illustration 5 g03655259
(1) 443-7246 Tube As (3) 425-3549 Gasket
Attach the fuel cooler core loosely to tube assembly (1) with one gasket (3) and the original hardware.
Illustration 6 g03655918
(3) 425-3549 Gasket (4) 419-6617 Tube As
Attach tube assembly (4) loosely to the fuel cooler core with one gasket (3) and the original hardware.
Illustration 7 g03655959
(4) 419-6617 Tube As (5) 419-0893 Solenoid Valve Gp (GSOV) (6) 420-8789 Gasket (7) 9X-8881 Bolt (8) 5P-8247 Hard Washer (9) 4K-0367 Full Nut
Attach GSOV (5) loosely to tube assembly (4) with one gasket (6), four bolts (7), four washers (8), and four nuts (9) .
Illustration 8 g03655960
(5) 419-0893 Solenoid Valve Gp (GSOV) (6) 420-8789 Gasket (7) 9X-8881 Bolt (8) 5P-8247 Hard Washer (9) 4K-0367 Full Nut (10) 443-7245 Bracket (11) 9X-8883 Bolt (12) 424-0851 Flange
Attach bracket (10) and flange (12) loosely to GSOV (5) with one gasket (6), two bolts (7), two bolts (11), four washers (8), and four nuts (9). Refer to Illustration 8 for the correct location of the bracket and bolts.
Illustration 9 g03655974
(1) 443-7246 Tube As (2) 424-11