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If you know that you have a good plug, and you don't have spark at the plug, then it is a bad Ignition Coil (Module). If you need further help, let me know.
The Briggs and Stratton 450 series is the engine (4.5 Hp). Is there a model number on the mower deck anywhere? I can probably find you a manual but need that model number. Unless you just want an engine manual.
Murray makes a 20 inch MX450 that has the Briggs and Stratton 450 engine on it but there are numerous makes and models (self propelled) that use this engine.
It should be a MURRAY part number 37X84 ( NOTE: that is read 37 "ex" 84 NOT 37 "by" 84, it is a part number not a measurement) but without knowing the exact model number of your lawnmower, I can't say for certain.
You need a rear wheel part# 71133MA. A place to look up this model would be at www.precisionope.com. Look up OEM parts section, in may be under Murray or Briggs & Stratton. Briggs bought out Murray out several years ago. Hope that helps.
Hi,
Here is the link to the parts list for your mower. Though it doesn't give instruction for replacement, it does show an exploded view of the components:
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