Derfly=50 years engine building. Hope this helps:
You can have a "spark" BUT NOT A GOOD SPARK ! Good spark is BLUE AND SNAPS/CRACKS so: take off flywheel shroud get a piece of white letter paper and hold over flywheel MAGNETS. Turn flywheel until magnets are under 2 arms of armature. Unscrew (partially) 4 bolts holding armature to block. Magnets will pull armature to them. Tighten bolts and slowly turn flywheel+magnets away from armature. You can now remove paper(you have just set armature air gap).
Turn idle screw in till hits base then open 1 and 1/2 turns. Make sure hose from crankcase is clamped to carb. Install new plug and check spark ! If have float bowl=turn screw OUT 1 turn from base. Hopefully starts=if not prob is carb. Get rebuild kit(MAKE SURE IT IS B&S FACTORY=IMPORTANT !).
These people who say it's valves are crazy(unless someone has messed with them). You can run these engines on the side of route 70 for 2080 HOURS=ONE YEAR and the valves will NEVER be out of adjustment. See my talk about fixing carb in above comment; the best way to clean carb is with GUNK CONCENTRATE (availlable at wholesalers) AND ULTRASONIC CLEANER. This is what they are using to restore Mukini carbs on antique 2 strokes. THANKS Derfly
Wtha u probliam Plz Halp Me My Id faxebook Haked
The fuel coming out carb and the backfire before running good. check your valves. take valve covers off i dont have a manual infront of me but you have to find top dead center on comprision stroke. the valve springs on that cylinder intake and exhaust will be equal. take a feller gauge and check the clearance. i think it between .030 and .060. i use the .060 one. i have used the .030 once its alittle to tight, if ur valves are loose it can cause all of what i described. ill bet before it got this bad. you had to use alittle starter fluid to get it to crank.
it sounds like a fuel starvation problem it is very possible theres a blocked vent in the carb. the carb will probably will need rebuilding not very difficult
SOURCE: Ok i have a problem
It appears that you have a slight mis-adjustment in the idle speed and idle mixture. To adjust setup, start with at least a half tank of fuel, and have engine at operating temperature (That is warm but not overly Hot). The Briggs & Stratton Website manuals section should show the locations of the adjusting screws if you are not sure of them.
To adjust idle speed set Throttle control to minimum and adjust screw on throttle butterfly to maintain a good idle speed. To adjust idle mixture, screw in idle mixture screw (Lean) until motor falters and then screw out (Rich) until it falters again. Correct setting is the halfway point of these two positions. You may have to re-adjust idle speed again and also the mixture to get best running.
If you are not comfortable doing this, take it to a B & S dealer.
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