if u turn the motor over by hand u can c a spark that dozent mean u have a sroung enough spark ok. of u hold the thang and turn it over u can actuly fell the spark and how intence the spark is if it dont fell srong theen it usuly ant ok ime just wondering if its like every other cdi system or if it runs at less of a sringhth its a old try and tru methid and as long as u dont turn it ouer as fast as u can it works real good and its just a short strong surge test lights dont always work and if u are in the middel of the woods and it stops u can hold on to the spark plug wire when its off hold a wrench or srew driver in the boot to check if ure geting spark if u dont have a spark plug wrench or if most likely the spark plug is hot as h3ll