need help evinrude only working on one cylinder

[66evinrude]

got a 1966 evinrude ski-twin 33hp well thought i had it working properly but it only running on one cylinder this is what i have done so far cleaned carb ,changed out gas in tank, cleaned and set points, compression is 100 psi on both cylinders hot,checked reeds,etc etc. its got good spark on both cylinders but could the coil or condenser be bad even though its got good spark? seems like when its idling sometime its trying to kick in other cylinder?? any ideas?? matches maybe lol

 

[Daviet]

Re: need help evinrude only working on one cylinder

Do you know which cylinder is not firing? Is the cutout switch still connected? What do the plugs look like?

 

[66evinrude]

Re: need help evinrude only working on one cylinder

only the bottom cylinder works if i take the bottom plug wire off while engine is running it just stalls. yes cut out switch is still connected. plugs are little wet

 

[Daviet]

Re: need help evinrude only working on one cylinder

Have you checked the spark with an air gap tester, spark should jump 3/8" air gap and be bright blue. The front coil controls the top cylinder.

 

[66evinrude]

Re: need help evinrude only working on one cylinder

yup i bought a new spark tester just for this reason spark is good also could i unhook the cut out switch or will this effect something?

 

[Daviet]

Re: need help evinrude only working on one cylinder

You can disconnect it for testing.

 

[66evinrude]

Re: need help evinrude only working on one cylinder

well found out why my engine is only working on one cylinder and yup its ignition problem so i just ordered everything for both cylinders coils points condensors coil wires and plugs now it better work or else boom thanks for your help daviet only way the other cylinder will work is if i close my spark plug gap to 15 thou

 

[kfa4303]

Re: need help evinrude only working on one cylinder

Good idea. Don't forget new s'plug wires. They make a big difference too. No sense it getting new points and condensers and then using the same old wires. You can get for about $3 a foot from NAPA. 7mm coppper core with a couple new boots won't cost $20 and it'll make the points and condensers work ten times better. Good luck.

 

[66evinrude]

Re: need help evinrude only working on one cylinder

thanks kfa4303 and yes when i ordered new parts i did order new wires