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In Reply to: Briggs and stratton 18hp 2cylinder garden tractor will turn over but wont fire up posted by Bill rogers on Sunday, September 18, 2016:
If eng cranks but will not fire/run leave the alternator alone as it's not the problem,alt is only used to charge battery.
The most likly simple cause(s) of your problem with the exception of an internal mech problem in eng are as follows:
1-problem in safety sw 's on tractor or wiring for same.
2-problem in ON ENG ign system wiring or ign coil(s).
3-restriction/blockage or fuel pump problem in fuel delivery system to carb.
4-dirt/water in carb or restriction/blockage of internal passages in carb body.
5-intake manifild leaking air.
The best thing you can do to help yourself is get a wiring diagram of tractor & a service/repair manual at local mower shop,briggs website or ebay that covers your mod# eng,just saying tractor is a 95 murray means little/nothing without an eng mod# & tractor mod# due to fact in time frame you're talking about briggs made 2 different mod ohv twin eng & an opposed L(flathead)twin eng,the ign system & fuel system is different on each of them,we have no idea which mod eng you have.
The 1st thing you have to do is isolate problem to safety sw's/wiring system,ign system,fuel system or an internal eng problem,once you do that you can break the problem system down & find cause of problem.
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