General Reference; Standard Bolt Torque Specification; Stroke Gasoline / Oil Pre Mix; Gasoline Volatility - Polaris 2000 120 XCR Service Manual

GENERAL

GENERAL REFERENCE

STANDARD BOLT TORQUE SPECIFICATION

Grade 2
1/4 20 5 (7)
1/4 28 6 (8)
5/16 18 11 (15)
5/16 24 12 (16)
3/8 16 20 (27)
3/8 24 23 (32)
7/16 14 30 (40)
7/16 20 35 (48)
1/2 13 50 (69)
1/2 20 55 (76)
.- . X 1.356 = N
FT LB
N X.7376 =
M

2 STROKE GASOLINE / OIL PRE MIX

OZ OF OIL
GALLONS OF NEEDED TO
FUEL ACHIEVE A
20:1 RATIO
1
2
3
4
5
6
To figure out the correct fuel to oil ratio per gallon, you will need
to use different formulas for the ratio that you are looking for.
Example of a fuel/oil ratio of 20:1 is figured out by taking the
gallons of the fuel mixing container (1 gallon) and converting it
to ounces (128 oz.) divided by the ratio that you are looking for
(20), this will give you the amount of oil that you need (6.4 oz.)
to add to the fuel in the mixing container.
1 gallon has 128oz. / 20 = 6.4 oz. of oil needed to mix to each
1 gallon of gasoline. For a 5 gallon mixture, you would need add
32 oz. of oil to the gasoline.
2.6
Grade 8
Grade 5
8 (11) 12 (16)
10 (14) 14 (19)
17 (23) 25 (35)
19 (26) 29 (40)
30 (40) 45 (62)
35 (48) 50 (69)
50 (69) 70 (97)
55 (76) 80 (110)
75 (104) 110 (152)
90 (124) 120 (166)
M
.- .
FT LB
OZ OF OIL
NEEDED TO
ACHIEVE A
32:1 RATIO
6 4
13 8
19 12
26 16
32 20
38 24

GASOLINE VOLATILITY

M R V
AXIMUM EID APOR
CLASS PRESSURE
A 7.0 psi (0.5 bar)
B 9.0 psi (0.6 bar)
C 10.5psi (0.7 bar)
D 12.0psi (0.8 bar)
E 13.5psi (0.9 bar)
Add 2.45° Ffor each 1000 ft (305m) above sea level
One of the misunderstood properties of gasoline is its volatility,
or ability to vaporize at different ambient temperatures and
altitudes during the year.
When gasoline is blended, it is given a Reid Vapor Pressure
(RVP) number which reflects its ability to vaporize or mix with
air at a given temperature range. Gasoline vapor pressure is
measured by putting a sample of fuel inside a closed container
and applying a specified amount of heat to the container for a
certain amount of time. RVP will vary from about 7.0 PSI during
the summer to approximately 13.5 PSI during the colder
months. Service stations selling a large volume of fuel will
normally have the correct blend to work well at all times
throughout the year in their local area.
When the weather is very cold, gasoline must be able to vaporize
very quickly in order for an engine to start and warm up
properly. If summer blend fuel is being used in the winter, little
or no vaporization will occur. Droplets will form causing
flooding and very hard starting.
If winter blend fuel is being used during the summer months, it
may cause vapor lock (boiling fuel) inside the fuel lines, fuel
pump, or carburetor. This will cause warm engine drive ability
problems and hard starting when warm.
A A T
MBIENT IR EMP
R
ANGE
LOW HIGH
60° F 110° F+
(16° C) (43° C+)
50° F 110° F
(10° C) (43° C)
40° F 97° F
(4° C) (36° C)
30° F 85° F
(-1° C) (29° C)
20° F 69° F
(-7° C) (21° C)