1998 90HP V4 starts will not stay running.

[A Potts]

I have a 1998 Johnson 90HP V4, never been in the shop, only work has been new plugs. It starts easy but it will not stay running unless you hold the choke in. I have rebuilt the fuel pump, been through both carbs and found no problems. added fresh fuel but had no change in performance.
Any help would be appreciated.

A Potts

 

[HybridMX6]

Re: 1998 90HP V4 starts will not stay running.

How well did you clean the carbs? Did you install new rebuild kits in each one and comletely take them apart, even the low and high speed jets and clean those out with some wire? It's not getting fuel for some reason, my guess would be some sort of restriction in the low speed jet.
Did you set the idle screws properly? Start 1.5 turns out and slowly adjust out in small increments? I have a '93 60hp and it's carbs ended up being 2.25 turns out.

 

[kenmyfam]

Re: 1998 90HP V4 starts will not stay running.

Rebuild the carbs

 

[A Potts]

Re: 1998 90HP V4 starts will not stay running.

Thanks for the tip, I'll recheck the jets, I may have missed something. I did not touch the idle adjustments, but I will check them also.

A. Potts

 

[kenmyfam]

Re: 1998 90HP V4 starts will not stay running.

Thanks for the tip, I'll recheck the jets, I may have missed something. I did not touch the idle adjustments, but I will check them also.

A. Potts

Cleanliness is vital with the carb's. You may have something in there that you missed. We have all done it at sometime.