1975 Thunderjet - Vintage Snow

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CARBURETION 15 ~ '-0 .->------31 1- - - )--------29 -30 1-- - 2-- 3----- 28 ~-------27 -------26 fA 25 ~----24 _~" _ """ I 23 ~ll".:'Io--.....' '-,,& 2 2 ~/~ 21 #J~~ ~20 4----- 5---------+-~ 6---~ 7----- 19 ------18 ----- - - - - 17 --- ----16 --------15 --------14 - - - - - --13 --- ---12 8 - - - - - --11
16 The <strong>1975</strong> Thunder Jet is equipped with dual 36 mm MikUlo. VM type slide carburetors. Experience has shown the Mikuni VM carburetor provides the best performance and tuning capacity available at this time. There are several distinct functions of the Mikuni, and it is important to understand their operation. MIKUNICARBURETOR Operation A. Starter System (Choke) (Figure 46) The purpose of the starter system is to enable easy starting when the engine is cold. In the starter system, fuel and air for starting the engine are metered with entirely independent jets. The air metered in the starter jet is mixed with fuel from the float bowl and is broken into tiny particles in the emulsion tube. The mixture then flows into the plunger area, mixed again with air coming from the air intake port for starting and is delivered to the engine in the proper air-fuel ratio through the fuel discharge outlet. The starter is opened and closed by means .of the starter plunger. Since the starter is constructed so as to utilize the negative pressure of the inlet pipe, it is important that the throttle valve is closed when starting the engine. To Venturi Mixture SP~ Pilot Jet TJ47 r-igure 47 C. Intermediate System (Figure 48) When the throttle valve is opened further, the pilot outlet of the idle system cannot supply the required fuel. This shortage has to be made up with fuel entering from the bypass and main system needle jet. Fuel passing through the main jet in the intermediate range is metered by the clearance between the needle jet and jet needle. Air entering from .the main air intake mixes with the fuel being discharged from the needle jet. The jet needle moves up and down with the throttle valve to control the fuel mixture in the intermediate range. The throttle cutaway also affects the mixture in the intermediate range, but has .no effect above one half throttle opening. Small Clearance Medium Clearance Large Clearance Float Chamber TJ46 Figure 46 B. Idle System (Figure 47) ''''---Needle Jet The air which enters through the pilot air intake passes around the outside of the air screw where it is metered and enters the pilot jet bleed holes. The air entering the pilot jet bleed holes mixes with the fuel that is being metered by the pilot jet. The fuel and air mixture being drawn further up the fuel channel is again mixed with air that enters through the bypass. This mixture is drawn into the pilot outlet to mix with air flowing through the main bore into the engine. Figure 48 TJ48
Page 2 and 3: TABLE OF CONTENTS Warranty 2 Safety
Page 4 and 5: spring is standard, but to increase
Page 6 and 7: Varying terrain and operating condi
Page 8 and 9: Note: On reassembly, the head bolts
Page 10 and 11: 7. The bottom half of the crankcase
Page 12 and 13: Installing th e cyli nde r head Cyl
Page 14 and 15: -- - ------ ENGINE TROUBLE SHOOTING
Page 18 and 19: D. High Speed System Fue l fr om th
Page 20 and 21: Trouble Shooting Malfunctions that
Page 22 and 23: --------------- Spikes have a singl
Page 24 and 25: 23 Sprockets and Chaincase The Thun
Page 26 and 27: COMPONENT PA RTS : Component parts
Page 28 and 29: ENGINE MOUNT 02-27 THUNDER JET 1975
Page 30 and 31: EXHAUST 03-29 TH UN DER JET 1975 No
Page 32 and 33: ELECTRIC SYSTEM 04-31 THUNDER JET 1
Page 34 and 35: DRIVE CLUTCH 05-33 THUNDER JET 1975
Page 36 and 37: • CONVERTER/CHAIN CASE 05-35 THUN
Page 38 and 39: CONVERTER/CHAIN CASE 05-37 THUNDER
Page 40 and 41: BRAKE 05-39 THUNDER JET 1975 No. Sn
Page 42 and 43: SUSPENSION 06-41 THUNDER JET 1975 N
Page 44 and 45: FRONT SHAFT 06-43 THUNDER JET 1975
Page 46 and 47: SKI 08-45 THUNDER JET 1975 No. Sno*
Page 48 and 49: STEERING 09-47 THUNDER JET 1975 No.
Page 50 and 51: BODY & SEAT 10-49 THUNDER JET 1975
Page 52 and 53: BODY & SEAT 10-51 THUNDER JET 1975
Page 54 and 55: HOOD & DASH 12-53 THUNDER JET 1975
Page 56 and 57: FUEL SYSTEM 79-55 THUNDER JET 1975

1975 Thunderjet - Vintage Snow

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