Racer4YSR's Stock Yamaha YSR Spec Page

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(Jim)

Stock YSR Specs

Dimensions

Length 1,630 mm 64.2 in

Width 635 mm 25.0 in

Height 930 mm 36.6 in

Seat Height 660 mm 25.6 in

Wheel Base 1,055 mm 41.5 in

Min. Ground Clearance 120 mm 4.7 in

Weight w/ Oil & Fuel 91 kg 210 lbs

Weight w/o Oil & Fuel 165 lbs

Fuel Capacity 2.11 gallons

Min. Turning Radius 2,400 mm 94.5 in

Engine

Type Air Cooled, Single, 2-Stroke

Displacement 49.3 cc

Bore/Stroke 40.0 X 39.2 mm 1.57 X 1.54 in

Compression Ratio 7.4:1

Max. Torque 4.27 ft. lbs.@8,500 rpm

Ignition CDI

Starting System Kick Starter

Induction System Reed valve

Carburetion Mikuni VM16SH

Air Filter Wet type element

Lubrication System Yamaha Autolube

Oil Tank Capacity .73 L .77 US qt

Oil Type Yamalube 2 or BIA cert. for service TC-W

Transmission Oil Capacity .65 L .69 US qt

Periodic Trans. Oil Change .60 L .63 US qt

Transmission Oil Type Yamalube 4 or SAE 10W30 Type SE or GL gear oil

Transmission 5 Speed

Transmission

Type Constant mesh 5-speed

Primary Reduction System Helical gear

Primary Reduction Ratio 68/19 3.579

Secondary Reduction System Chain drive

Secondary Reduction Ratio 44/12 3.667

Operation Left foot operation

Gear Ratio 1st 39/12 3.250

Gear Ratio 2nd 34/17 2.000

Gear Ratio 3rd 30/21 1.429

Gear Ratio 4th 27/24 1.125

Gear Ratio 5th 25/26 0.962

Clutch

Type Wet, multiple disc

Carburetor

Type VM16SH

Manufacturer Mikuni

Main Jet #120

Pilot Jet #17.5

Starter Jet #20

Air Jet 2.5

Jet Needle-Position 3G21-4

Needle Jet E-0

Cutaway 2.0

Pilot Outlet 0.9

Air Screw 1-1/8

Valve Seat Size 1.5

Fuel Level 0~1 / 0~0.04"

Float Height 21~23mm / 0.83~0.91"

Idle Speed 1,300~1,400 rpm

Spark Plug

Type B7HS or B8HS

Manufacturer NGK

Manufacturer 0.5~0.6mm / 0.020~0.024"

Reed Valve

Valve Thickness 0.15mm 0.006"

Valve Stopper Height 6.7~7.3mm 0.26~0.29"

Valve Bending Limit 0.3mm 0.012"

Suspension

Front Telescopic Fork

Rear Monoshock

Brakes

Front Type Single disc

Front Disc Outside Diameter 203mm 8.00"

Front Disc Thickness 4.0mm 0.16"

Front Brake Pad 6.0mm 0.24"

Front Pad Wear Limit 0.5mm 0.02"

Master Cylinder Inside Diameter 11.0mm 0.433"

Caliper Cylinder Inside Diameter 34.9mm 1.37"

Brake Fluid Type DOT #3

Rear Type Drum

Drum Inside Diameter 110mm 4.33"

Drum Wear Limit 111mm 4.37"

Lining Thickness 4mm 0.16"

Lining Wear Limit 2mm 0.08"

Tires

Front 3.50 X 12

Rear 4.00 X 12

Chassis

Frame Type Double cradle

Caster Angle 25.3°

Trail 64mm ~ 2.52"

Chain

Type 420M

No. Links 99 Links + Master link

Free Play 25~30mm / 1.0~1.2"

Torque

Spark Plug 18 ft lb

Cylinder Head 7.2 ft lb

Intake Manifold 5.8 ft lb

Muffler (Front) 5.8 ft lb

Muffler (Rear) 13 ft lb

Crankcase 5.8 ft lb

Crankcase Cover 7.2 ft lb

Transmission Drain Bolt 14 ft lb

Primary Drive Gear 43 ft lb

Clutch Boss 32 ft lb

Pressure Plate 4.3 ft lb

Shift Lever Adj. Nut 18 ft. lb

Change Pedal 8 ft lb

Stator 5.8 ft lb

CDI Magneto 50 ft lb

Neutral Switch 2.9 ft lb

Engine Mount 18 ft lb

Engine Stay 18 ft lb

Rear Shock 29 ft lb

Front Fork Cap 40 ft lb

Lower Triple Clamp 22 ft lb

Steering Ring Nut 4.3 ft lb

Steering Stem Bolt 29 ft lb

Wheel Hub & Rim 22 ft lb

Front Brake Disc 14 ft lb

Brake Caliper 25 ft lb

Front Axle & Nut 29 ft lb

Rear Sprocket & Hub 25 ft lb

Rear Axle & Nut 43 ft lb

Colors/Year

1987 White/Red

1988 White/Red or Blue/Yellow

1989 White/Red or Blue/Yellow

1990 White/Red

1991 White/Red or Black/Yellow

1992 White/Red or Black/Yellow

If there is a specification not listed here that you require E-mail me.

Other Racer4YSR sites to check out

Racer4YSR's Home Page...Back to Jim's home page
A-Tak Force Racing Team...Our 6 time championship racing team
Racer4YSR's Race Results...Latest races results & locations
Racer4YSR's Picture Page...Various pictures of me racing
Racer4YSR's Links...A few motorcycle links
Racer4YSR's Multiple Myeloma Cancer...My fight with cancer
Bro's/Team mate Home Page...Jason's home page
Bro's/Team mate Racing Page...Jason's Racing Page
The Right Line...South West Association of Road Racing Teams
Kamikazi Cole's YSR Page...YSR racer from Las Vegas
MiniMoto Madness...Pocketbikes & YSR's. Parts, Service, New & Used bikes for sale.

Created by ®
Created on Apr.22,1999
Last updated on Mar.18,2000

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Length	*1,630 mm*	*64.2 in*
Width	*635 mm*	*25.0 in*
Height	*930 mm*	*36.6 in*
Seat Height	*660 mm*	*25.6 in*
Wheel Base	*1,055 mm*	*41.5 in*
Min. Ground Clearance	*120 mm*	*4.7 in*
Weight w/ Oil & Fuel	*91 kg*	*210 lbs*
Weight w/o Oil & Fuel		*165 lbs*
Fuel Capacity		*2.11 gallons*
Min. Turning Radius	*2,400 mm*	*94.5 in*

Type	*Air Cooled, Single, 2-Stroke*
Displacement	*49.3 cc*
Bore/Stroke	*40.0 X 39.2 mm*	*1.57 X 1.54 in*
Compression Ratio	*7.4:1*
Max. Torque	*4.27 ft. lbs.@8,500 rpm*
Ignition	*CDI*
Starting System	*Kick Starter*
Induction System	*Reed valve*
Carburetion	*Mikuni VM16SH*
Air Filter	*Wet type element*
Lubrication System	*Yamaha Autolube*
Oil Tank Capacity	*.73 L*	*.77 US qt*
Oil Type	*Yamalube 2 or BIA cert. for service TC-W*
Transmission Oil Capacity	*.65 L*	*.69 US qt*
Periodic Trans. Oil Change	*.60 L*	*.63 US qt*
Transmission Oil Type	*Yamalube 4 or SAE 10W30 Type SE or GL gear oil*
Transmission	*5 Speed*

Type	*Constant mesh 5-speed*
Primary Reduction System	*Helical gear*
Primary Reduction Ratio	*68/19*	*3.579*
Secondary Reduction System	*Chain drive*
Secondary Reduction Ratio	*44/12*	*3.667*
Operation	*Left foot operation*
Gear Ratio 1st	*39/12*	*3.250*
Gear Ratio 2nd	*34/17*	*2.000*
Gear Ratio 3rd	*30/21*	*1.429*
Gear Ratio 4th	*27/24*	*1.125*
Gear Ratio 5th	*25/26*	*0.962*

Type	*VM16SH*
Manufacturer	*Mikuni*
Main Jet	*#120*
Pilot Jet	*#17.5*
Starter Jet	*#20*
Air Jet	*2.5*
Jet Needle-Position	*3G21-4*
Needle Jet	*E-0*
Cutaway	*2.0*
Pilot Outlet	*0.9*
Air Screw	*1-1/8*
Valve Seat Size	*1.5*
Fuel Level	*0~1 / 0~0.04"*
Float Height	*21~23mm / 0.83~0.91"*
Idle Speed	*1,300~1,400 rpm*

Type	*B7HS or B8HS*
Manufacturer	*NGK*
Manufacturer	*0.5~0.6mm / 0.020~0.024"*

Valve Thickness	*0.15mm*	*0.006"*
Valve Stopper Height	*6.7~7.3mm*	*0.26~0.29"*
Valve Bending Limit	*0.3mm*	*0.012"*

Front Type	*Single disc*
Front Disc Outside Diameter	*203mm*	*8.00"*
Front Disc Thickness	*4.0mm*	*0.16"*
Front Brake Pad	*6.0mm*	*0.24"*
Front Pad Wear Limit	*0.5mm*	*0.02"*
Master Cylinder Inside Diameter	*11.0mm*	*0.433"*
Caliper Cylinder Inside Diameter	*34.9mm*	*1.37"*
Brake Fluid Type	*DOT #3*
Rear Type	*Drum*
Drum Inside Diameter	*110mm*	*4.33"*
Drum Wear Limit	*111mm*	*4.37"*
Lining Thickness	*4mm*	*0.16"*
Lining Wear Limit	*2mm*	*0.08"*

Frame Type	*Double cradle*
Caster Angle	*25.3°*
Trail	*64mm ~ 2.52"*

Type	*420M*
No. Links	*99 Links + Master link*
Free Play	*25~30mm / 1.0~1.2"*

Spark Plug	*18 ft lb*
Cylinder Head	*7.2 ft lb*
Intake Manifold	*5.8 ft lb*
Muffler (Front)	*5.8 ft lb*
Muffler (Rear)	*13 ft lb*
Crankcase	*5.8 ft lb*
Crankcase Cover	*7.2 ft lb*
Transmission Drain Bolt	*14 ft lb*
Primary Drive Gear	*43 ft lb*
Clutch Boss	*32 ft lb*
Pressure Plate	*4.3 ft lb*
Shift Lever Adj. Nut	*18 ft. lb*
Change Pedal	*8 ft lb*
Stator	*5.8 ft lb*
CDI Magneto	*50 ft lb*
Neutral Switch	*2.9 ft lb*
Engine Mount	*18 ft lb*
Engine Stay	*18 ft lb*
Rear Shock	*29 ft lb*
Front Fork Cap	*40 ft lb*
Lower Triple Clamp	*22 ft lb*
Steering Ring Nut	*4.3 ft lb*
Steering Stem Bolt	*29 ft lb*
Wheel Hub & Rim	*22 ft lb*
Front Brake Disc	*14 ft lb*
Brake Caliper	*25 ft lb*
Front Axle & Nut	*29 ft lb*
Rear Sprocket & Hub	*25 ft lb*
Rear Axle & Nut	*43 ft lb*

1987	*White/Red*
1988	*White/Red or Blue/Yellow*
1989	*White/Red or Blue/Yellow*
1990	*White/Red*
1991	*White/Red or Black/Yellow*
1992	*White/Red or Black/Yellow*