Originally Posted by
vease
I have an issue trying to start and keep running my 3W 80 with rcexl ignition unit.
If i manage to get it running it runs fine at top end and will tick over for a short while but then die.
Upon investigation I've found that it sparks on some revolutions but not others.
I've tried different ign units and different plugs and no difference. Also the pick up is brand new
Any thoughts welcome
Thoughts, yea start here:
when was this engine made?
single or twin?
what ignition was it supplied with?
what prop do you have on it?
The reason for most of these questions is the old ignitions for 3W's were not driven by hall effect sensors. All our arms got tired one day trying to start a 3W that had been changed over the winter by the new owner. He just screwed the hall effect sensor in the holes for the old sensor. I put the prop at TDC to quick eyeball the timing and boy was it off. I unscrewed the sensor ziptied it in about the right place and the motor ran great. So sensor brackets are now available for older engine conversions (just if that is the case).
Other reasons I will think about for awhile.