Honda 1998 VT750C User Manual

CRANKSHAFT jTRANSMISSION
SERVICE INFORMATION
GENERAL
• The crankcase halves must be separated to service the crankshaft, connecting rod and transmission (including the shift
fork and shift drum). To service there parts, the engine must be removed from the engine (Section 7).
• The
following parts must be removed before separating the crankcase:
- Oil
filter (Section 3)
-
Water pump (Section 6)
- Cylinder head (Section 10)
- Cylinder,
piston (Section 11)
- Clutch,
gearshift linkage and primary drive gear (Section 8)
- Alternator, flywheel (Section 9)
- Starter motor (Section 18)
- Neutral
switch, oil pressure switch (Section 19)
•
Be careful not to damage the crankcase mating surface.
•
When disassembling, mark and store the disassembled parts to ensure that they are reinstalled in their original locations.
• Connecting rod
bearing inserts are select fitted and are identified by color code. Select the replacement bearings using
the selection tables. After installing new bearings, recheck them with plastigauge to verify correct clearance.
• Clean and
apply sealant to the crankcase mating surfaces. Wipe off excess sealant thoroughly.
SPECIFICATIONS
Unit: mm (in)
ITEM
STANDARD
SERVICE LIMIT
Crankshaft
Side clearance 0.05 - 0.20 (0.002 - 0.008) 0.30 (0.012)
Runout
--
0.03 (0.001)
Crank pin
oil clearance 0.028 - 0.052 (0.0011 - 0.0020) 0.07 (0.003)
Main journal oil clearance 0.030 - 0.046 (0.0012 - 0.0018)
0.07 (0.003)
Transmission
Gear I.D. M3, M5 28.000 - 28.021 (1.1024 - 1.1032) 28.04 (1.104)
C1, C2, C4
31.000 - 31.025 (1.2204
-1.2215) 31.05 (1.222)
Bushing a.D. M3, M5 27.959 - 27.980 (1.1007 - 1.1016) 27.94 (1.100)
C1, C2, C4
30.950 - 30.975 (1.2185 - 1.2195) 30.93 (1.218)
Bushing I.D. M3 25.000 - 25.021 (0.9843 - 0.9851) 25.04 (0.986)
C2 27.995 - 28.016 (1.1021 - 1.1030) 28.04 (1.104)
Gear-to-bushing M3, M5
0.020 - 0.062 (0.0008 - 0.0024) 0.10 (0.004)
clearance
C1,C2,C4 0.025 - 0.075 (0.0010 - 0.0030) 0.11 (0.004)
Mainshaft G.D.
M3 bushing
24.972 - 24.993 (0.9831 - 0.9840) 24.95 (0.982)
Case
journal A 19.980 - 19.993 (0.7866 - 0.7871) 19.96 (0.786)
Case
journal B
21.967 - 21.980 (0.8648 - 0.8654) 21.94 (0.864)
Countershaft a.D. C2 bushing 27.967 - 27.980 (1.1011- 1.1016) 27.95 (1.100)
Case
journal A 27.972 - 27.990 (1.1013 -1.1020) 27.95 (1.100)
Case
journal B 19.980 - 19.993 (0.7866 - 0.7871) 19.96 (0.786)
Bushi
ng-to-shaft
M3
0.007 - 0.049 (0.0003 - 0.0019)
0.08 (0.003)
clearance
C2 0.0.15 - 0.049 (0.0006 - 0.0019) 0.08 (0.003)
Shift fork, fork Fork !.D.
13.000 - 13.021 (0.5118 - 0.5126)
13.04 (0.513)
shaft
Claw thickness 5.93 - 6.00 (0.233 - 0.236) 5.6 (0.22)
Fork
shaft G.D. 12.966 - 12.984 (0.5105 - 0.5112)
12.90 (0.508)
Shift drum a.D. (at left side journal)
11.966-11.984 (0.4711-0.4718) 11.94 (0.470)
12-2

Honda 1998 VT750C Specifications

General

Displacement	745 cc
Bore x Stroke	79 mm x 76 mm
Compression Ratio	9.0:1
Ignition	CDI
Transmission	5-speed
Final Drive	Shaft
Rear Brakes	Drum
Front Tire	100/90-19
Rear Tire	140/90-15
Fuel System	Two 34mm constant-velocity carburetors
Front Suspension	41mm fork; 5.1 inches travel
Rear Suspension	Dual shocks
Front Brakes	Single disc
Seat Height	686 mm