Sparkplug gap for ryobi 410r 31cc tiller - Ryobi Cultivator

with a multimeter set on ohms resistance and in the coil wiring
you can also test by removing the plug , using a new plug connect the ht wire to the plug and ground the body of the plug onto metal of the engine-- problem
pull the cord fast and check for a spark across the plug gap
good blue spark --not a coil problem

check the air gap between the coil and the flywheel ( .005 to .010" gap) coils seldom fail and it generally the plug or switch wires that are at fault

Look closely at this exploded diagram.
It appears the piston 'relief' goes to the flywheel side.

Ryobi Tiller 410r Parts List

take off the muffler and try it again if better then open the muffler and clean the screen most pry open

If its a 725r ryobi weed eater it takes a champion RDJ7Y with

a gap of 0.020 in. or (0.5mm) with a feeler gauge.

torque @ 110-120 in.lbs. good luck!

I have a 410R still looks like new.
it has on it gas & oil = 40. to 1 for mixture.
mine never gets used so it is still new.

http://www.oscar-wilson.com/MANUALS/BOLENS/21B-121R765.PDF there ya go..

remove the screws holding the recoil cover off I would think and go here for parts and use your model numbers to find your unit.
www.ereplacementparts.com/ryobi-tiller-parts-c-7931_15702.html

After starting close the choke , push the lever back in
Vitally

you have a needle valve stuck open. i am not familiar with your model but if you can remove the float bowl and clean it out maybe replace the needle and seat and the float it should fix the problem good luck.

They have the parts your looking for at www.lawnmowerpartstore.com