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Curtis B.
Curtis B., Technician
Category: Agriculture and Farm Equipment
Satisfied Customers: 28066
Experience:  Technican turned service manager on multiple lines of equipment and rental equipment.
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Have a 1975 deere 400 snowmobile with good spark but wont

Customer Question

Have a 1975 john deere 400 snowmobile with good spark but wont run
Submitted: 1 year ago.
Category: Agriculture and Farm Equipment
Expert:  Curtis B. replied 1 year ago.

Twin engine. Spark at both cylinders? If you remove spark plugs, and put fuel direct into the cylinders,re-install the spark plugs,will unit fire? Or with plugs out, run compression test, do you have around 100 psi?

Expert:  Curtis B. replied 1 year ago.

It it fires with fuel in the cylinders, the carburetor/fuel pump would be suspect, letting no fuel to cylinders.