1985 20hp Johnson outboard conversion 30hp timing

[hammer3232]

Hi I have a 1985 20hp Johnson outboard that I have restored and upgraded to a 30hp and I was told I would need to adjust the timing otherwise I would possibly blow up CDI’s can someone please help I can’t find any videos on how to adjust it

 

[racerone]

Hugh---???-----Where did you read that the wrong timing can " blow up " the CDI's.------Just nonsense I say !

 

[hammer3232]

Just a fellow that rebuilds outboards said it’s happened to him said that the timing would need adjusting and it would run better and won’t blow up CDI’s

 

[racerone]

Best not to let him touch your motor.

 

[Dano3578]

Converted my 86 20hp to the 35hp last year. No timing issues. Runs like a top

 

[Sea Rider]

What have you done for the 20 to 30 HP conversion, does both models shares the same CC powerhead, with same carb, but surely with a carb and timing restriction going on between both 2. Usually more fuel intake needs slight more timing advance if the above applies...​

Happy Boating

 

[Dano3578]

Changed out intake manifold and carb. Bigger throat on carb and bigger intake on manifold. From my understanding the powerHeads are the same.
Now you have me wondering what would happen if I advanced the timing
Otherwise it runs great. Probably could afford to burn off more fuel. I have noticed some residue in the bottom of the cowl

 

[Sea Rider]

Changed out intake manifold and carb. Bigger throat on carb and bigger intake on manifold. From my understanding the powerHeads are the same.
Now you have me wondering what would happen if I advanced the timing
Otherwise it runs great. Probably could afford to burn off more fuel. I have noticed some residue in the bottom of the cowl

For timing advance adjustments if needs to be performed, need the Service Manual to check if states a difference in timing advance between both models, some motor manufacturers reserves the right to publish them, doesn't want boaters fingering their less HP motors when the next ones are more costly to buy and already factory converted. If with no available info, stay there...

Just prop right the motor to run towards middle to max of its wot rpm range factory stated as will be loaded to take the max out of that combo.

Happy Boating​