Onan JB Series - Tune-Up Specifications; Carbon Monoxide Hazard

TUNE-UP SPECIFICA"nONS
Cylinder head bolt torque (Ibs. ft.) .. , ....... ,""', .. ,', .. , ...... , .. , .. ,""", .... 28-30 (38-41 Nom)
Spark plug gap ..... ,:, ... ,." ... " , .. ,"" ......................... ':............ ,025(0,64 mm)
Centrifugal switch, breaker point adjustment ... , , , ..... , , . , .... , . , .. , , , , •.... , , .. , . .020 (0.51 mm)
Magneto, Pole shoe gap .. ,', ... " .. " ...... ,",.,.,"", ... , ...... , ...... , .. "... .020 (0.51 mm)
Breaker pOint setting gap ....... , . , .. , ....................... ; ........•......... ,. .020 (0.51 mm)I
Tappets*
Gasoline, Intake ....... , •. , , , , . , , , , .. , , , . , , , , . , . , , , . ,', . , , , , , , .. , .. , ..•. , ... , ... .
.012 (0.30 mm)
Exhaust ,;, .............. : .................. , ........................ .
.015 (0.38 mm)
Gas and Gas/Gasoline, Intake ........ ,. , .. , .... , , , ....•.......•. ; .. , .•• , . " .... , ,
.0131 (0.33 mm)
Exhaust·, •. ". ,', ... ',,',"'" " ".," " .. ,.,., .... ,' .. "','
.020 (0.51 mm)
Ignition timing sparkadvance**
(Running) Gas fuel*** ",." ... , .... " .. ,.,"""',.,""""""""',.".,"", .. ,.," 35° BrC
(Stopped) Gas fuel ",." ........... ,', .. "., .... ,"',., .. , .•...•. ,',.,',."., .. , ..... ,.". 5° BTC
(Running) Gasoline Fuel .
Flywheel magneto ... , , , . , .... , . , .... , . , .. , .. , ... , , .... , , . , , , ... , , , , .. , . . . . . . . . . . . . . .. 25° BTC
Battery ......... : ...... , .... , ..... , .................... '.' ..... , ...... , ............ '. . .. 25° BTC
(Stopped) Gasoline fuel
Flywheel magneto .... " ....... , ....... ,., .... , ....... ' ............................. '..... 5° ATC
Battery ... ~ .......................................... , ..... ; .. " .. , .... ,., ... ,......... 5° ATC
, - Set valve clearance with flywheel timing mark between 10° ATC
and 45° ATC with cylinder being adjusted on power stroke,
.. - The JB series has an automatic spark advance of 30° ,
•• '- Sets with a flywheel magneto must always fire at
25° BTC, regardless of fuel.
IWARNING)
ENGINE EXHAUST GAS (CARBON MONOXIDE) IS DEADLYI
Carbon monoxide is ,an odorless, colorless gas formed by Incomplete
combustion of hydrocarbon fuels. Carbon monoxide Is a dangerous gas that
can cause unconsciousness and Is potentially lethal. Some of the symptoms or
signs of carbon monoxide Inhalation are:.·
• Dizziness
• Vomiting
• Intense Headache
• Muscular Twitching
• Weakness and Sleepiness
• Throbbing in Temples
If you experience any of the above symptoms, get out Into fresh air
immediately.
The best protection against carbon monoxide inhalation is a regular inspection
of the complete exhaust system. If you notice a change In the sound or
appearance of, exhaust system, shut the unit down Immediately and have it
.inspected and repaired at once by a competent mechanic. .
If')
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