Carb:

250S:

Mikuni VM26SS

Main Jet: 110
Jet Needle: 5HN31 - 3rd clip (note: same needle as 5L1)
Needle Jet: O-3 (that's an oh-3, not zero-3)
Cut-away: 1.5
Pilot Jet: 17.5
Pilot Screw: 2 3/8 turns back

230S:

Mikuni VM26SS

Main Jet: 112.5
Jet Needle: 5HN23 - 3rd clip
Needle Jet: O-0 (that's an oh-zero, not zero-zero)
Cut-away: 1.5
Pilot Jet: 20
Pilot Screw: 2 turns back

 

Torque specs:

Head bolts: 8mm: 15-18 ft-lbs. 6mm: 5-8 ft-lbs

Cam sprocket bolt: 7-8.5 ft-lbs

Magneto rotor nut: 36-44 ft-lbs

Clutch sleeve hub nut: 29-44

Primary Drive Gear Nut: 44-58

Oil drain plug: 14-18

Drive Sprocket: 58-73

 

Connecting Rod: Vesrah catalog:

LT230SF,G,HQuadsport 23085-87VA-3004LT230SJQuadsport 230 ( Up to Engine No. 104360) 88VA-3004LT230SJQuadsport 230 (Engine No. 104361 and Up)88VA-3004

250S not listed

 

Catalog

230 valves

 

Catalog

250S valves

 

Rims:

Front: 4/166 10x5 2+3
Rear: 4/130 9x9 4.5+4.5

 

Flywheel puller:

Part Number: SS-8 Threads: 30x1.5 RF Fits: 230S, 250S, 220 bayou, and maybe more

 

Flywheel puller:

BikeMaster Magneto Flywheel Puller, Suzuki GSF, GS, GG, TM, TS at BikeBandit.com

Its hard to find is why I'm posting it.

 

Webcam stage 1:
Intake:
seat-to-seat duration: 270
.050 duration: 244
centerline: 107
max lift: .340
Exhaust:
seat-to-seat duration: 270
.050 duration: 244
centerline: 108
max lift: .340
cam lobe-center angle: 107.5
Valve overlap: 29
Valve opening/closing based on .050:
IVO: 15
IVC: 49
EVO: 50
EVC: 14
Valve opening/closing based on seat-to-seat:
IVO: 28
IVC: 62
EVO: 63
EVC: 27
Ramp rate as calculated by dyno2003: 2.65

Webcam stage 2:
Intake:
seat-to-seat duration: 278
.050 duration: 250
centerline: 103
max lift: .368
Exhaust:
seat-to-seat duration: 278
.050 duration: 250
centerline: 107
max lift: .360
cam lobe-center angle: 105
Valve overlap: 40
Valve opening/closing based on .050:
IVO: 22
IVC: 48
EVO: 52
EVC: 18
Valve opening/closing based on seat-to-seat:
IVO: 36
IVC: 62
EVO: 66
EVC: 32
Ramp rate as calculated by dyno2003: 2.67

Megacycle stage 1:
Intake:
seat-to-seat duration: 244
.050 duration: 229
centerline: 108.5
max lift: .400

Exhaust:
seat-to-seat duration: 244
.050 duration: 228
centerline: 104.5
max lift: .400
cam lobe-center angle: 106.5
Valve overlap: 15.5
Valve opening/closing based on .050:
IVO: 6
IVC: 43
EVO: 38.5
EVC: 9.5
Valve opening/closing based on seat-to-seat:
IVO: 13.5
IVC: 50.5
EVO: 46.5
EVC: 17.5
Ramp rate as calculated by dyno2003: 4.46

Stock 230S cam as measured by me:
Intake:
seat-to-seat duration: 337
.050 duration: 229
centerline: 122.5
max lift: .336
Exhaust:
seat-to-seat duration: 313
.050 duration: 227
centerline: 134.5
max lift: .311
cam lobe-center angle: 128.5
Valve overlap: 15
Valve opening/closing based on .050:
IVO: 14
IVC: 35
EVO: 46
EVC: 1
Valve opening/closing based on seat-to-seat:
IVO: 46
IVC: 111
EVO: 111
EVC: 22
Ramp rate as calculated by dyno2003: 1.73

Stock 250S cam as measured by me:
Intake:
seat-to-seat duration: 300
.050 duration: 245
centerline: 125
max lift: .339
Exhaust:
seat-to-seat duration: 338
.050 duration: 230
centerline: 133
max lift: .345
cam lobe-center angle: 129
Valve overlap: 19
Valve opening/closing based on .050:
IVO: 7
IVC: 58
EVO: 38
EVC: 12
Valve opening/closing based on seat-to-seat:
IVO: 25
IVC: 95
EVO: 122
EVC: 36
Ramp rate as calculated by dyno2003: 1.82

Stock LT4WD cam as measured by me:
Intake:
seat-to-seat duration: 330
.050 duration: 213
centerline: 125
max lift: .321
Exhaust:
seat-to-seat duration: 315
.050 duration: 218
centerline: 132.5
max lift: .284
cam lobe-center angle: 128.8
Valve overlap: 6
Valve opening/closing based on .050:
IVO: 4
IVC: 29
EVO: 36
EVC: 2
Valve opening/closing based on seat-to-seat:
IVO: 40
IVC: 110
EVO: 110
EVC: 25
Ramp rate as calculated by dyno2003: 1.68

 

That's all I can think of for now. It would be nice to have some Dirt Wheels magazine pics from the 80's to post.