re jetting question

[Coon4ss]

i have decided to switch my 1995 gtx to premix
it has a 657 engine

my question is what size jetting do i need to switch to to accomodate for the oil

 

[timmyboy76]

nuth'n...block the injection pump, and mix at 40/1

 

[Coon4ss]

Kk

But I have read on these forums that if you switch to premix and don't re jet the ski will run lean and overheat

 

[timmyboy76]

not at this forum....

 

[Coon4ss]

thankyou i thought i had seen it but i must have seen it it somewhere else and i trust yall more than anyone else

def givving rep points

 

[Dr Honda]

Yes… the oil will displace a small amount of fuel… but most of the older boats ran rich anyway. The 720 engines after 96 were leaned out (went from a 137.5 down to a 130 main jet)… but you should be fine.

If, you want/need more fuel… and your carbs don’t need rebuilt… then just turn out the high mixture screw a little to richen it up. You don’t “Need” to rejet.

 

[Coon4ss]

Cool. Nothing I love better than an explanation to go with an answer