79 tower with no power

[STREAMFREAK]

I have a 79 tower that was recently has new rings and pistons over the winter.We made the first shake down run last weekend and ran great to the other side of the lake of course and like a switch going on lost all top end power.It idles fine just no top power.I saw the volt meter was reading 16 plus volts.I Ohm tested the stator and rectifyer both bad and were replaced.Now it starts great and was a hard starter before but no power on the lake.Revs great on the hose but anything past idle nothing while in gear.The carbs were also cleaned over the winter when apart but Im certain its electrical.Fuel pump was also rebuilt at the same time.Any help would be great Thanks

 

[Chris1956]

Re: 79 tower with no power

OK, Why not start with a compression test and a spark test? That '79 can have a distributor ign or an ADI ignition. Please post if it has two switchboxes or one. Post compression and spark results.

make sure carbs open nearly all the way as you advance throttle.

 

[STREAMFREAK]

Re: 79 tower with no power

Yes it has 2 switch boxes no distributor and I will test spark and compression tonight.

 

[STREAMFREAK]

Re: 79 tower with no power

compression is 145-150 all cylinders and no spark on #1 and intermittent spark on #2 the rest were all good. One coil ohmed bad and the other ohmed ok.Ill swap switch boxes tonight and go from there.

 

[Chris1956]

Re: 79 tower with no power

Stream, I think the switchboxes control spark to 1,3,5 and 2,4,6. So if spark on 1 and 2 is bad, it may not be a switchbox. I recommend you go on CDIElectronics.com and look up troubleshooting procedure.