Joe Reeves
Supreme Mariner
- Joined
- Feb 24, 2002
- Messages
- 13,262
Re: Help is anyone local motor has pushed my buttons for the last time
If the combustion is actually firing out the exhaust which would sound like a shotgun being fired, either the flywheel key is sheared or (as Dhadley states above) you have a coil crossed with one other coil. In either case, the engine would not run properly at any rpm if it ran at all.<br /><br />Note that the flywheel nut must be torqued to 105 foot pounds.<br /><br />If the backfire sounds more like a spitting back type action, that would usually be due to fouled carburetors or restricted slow speed jets. You may have overlooked something in the carburetor area. The jets have a number on them indicating the opening in thousands..... run a proper size drill bit thru them to clean them out.<br /><br />The fact that the engine gains rpms when you shoot gas into the carburetor throats would indicate that the fuel flow thru the carburetor fuel passages are restricted. Did you actually manually clean the four (4) brass fixed high speed and slow speed jets? If not, do so.<br /><br />When running the engine at a low rpm.... when it is backfiring, spitting back, whatever, stick two fingers into the carburetor throats, one throat at a time. If the engine rpms pick up and the engine smooths out somewhat at any given carb throat, that carburetor is fouled at some area.
If the combustion is actually firing out the exhaust which would sound like a shotgun being fired, either the flywheel key is sheared or (as Dhadley states above) you have a coil crossed with one other coil. In either case, the engine would not run properly at any rpm if it ran at all.<br /><br />Note that the flywheel nut must be torqued to 105 foot pounds.<br /><br />If the backfire sounds more like a spitting back type action, that would usually be due to fouled carburetors or restricted slow speed jets. You may have overlooked something in the carburetor area. The jets have a number on them indicating the opening in thousands..... run a proper size drill bit thru them to clean them out.<br /><br />The fact that the engine gains rpms when you shoot gas into the carburetor throats would indicate that the fuel flow thru the carburetor fuel passages are restricted. Did you actually manually clean the four (4) brass fixed high speed and slow speed jets? If not, do so.<br /><br />When running the engine at a low rpm.... when it is backfiring, spitting back, whatever, stick two fingers into the carburetor throats, one throat at a time. If the engine rpms pick up and the engine smooths out somewhat at any given carb throat, that carburetor is fouled at some area.
