Gary , You should have spark regardless of cranking speed .
If you are trying to use a new style sensor with the old module they may not be compatible .
I will assume you are using a known good and fully charged battery.
If using the original module and sensor and there is no spark or weak spark the most common problem is the plug wire cap. (replace it )
If using a newer module be sure you are using the sensor that came with it .
If none of the above resolves the issue , send it to your preferred 3w dealer for diagnostics and repair.