Having trouble starting 90hp johnson vro v4 after it is warm

[boatingtattman]

I have a 1992 90hp johnson vro v4 on a 18 ft sunbird fish/ski. I took it out again today and after i ran it for about 2 hours, i went and ate lunch with my lady. When we came back after about an hour to leave the boat had alot of trouble starting. I choked it and crank and cranked and it finally started up. It had a large amount ofsmoke but that is normal..can someone help me with this.

 

[DJ]

Re: Having trouble starting 90hp johnson vro v4 after it is warm

It's time for carburetor rebuilds (2). your needle/seat valves (2) are leaking loading the engine up.

You can thank oxygenated (alcohol) fuel requirements.

 

[Chris1956]

Re: Having trouble starting 90hp johnson vro v4 after it is warm

Wouldn't that motor have 4 carbs on it?

I have a V6 that has similar trouble. I end up advancing the throttle and letting her run at 1200-1500 RPM in neutral for a couple of minutes until she runs smooth. I never could pipoint the cause for the warm start issue. it works perfect when coldstarting.

 

[boatingtattman]

Re: Having trouble starting 90hp johnson vro v4 after it is warm

I have no problem with it cold starting either. It seems that it was only when i had run the engine. U said that the needle seat valves are leaking and loading the engine up. Could that also make it get bad gas milage? It sems that my boat got very poor gas milage today.

 

[jonesg]

Re: Having trouble starting 90hp johnson vro v4 after it is warm

I have no problem with it cold starting either. It seems that it was only when i had run the engine. U said that the needle seat valves are leaking and loading the engine up. Could that also make it get bad gas milage? It sems that my boat got very poor gas milage today.

yep, get carb kits and rebuild them, very simple DIY project.
See the sticky file for pics and instructions.
Watch video for overall idea.
http://www.youtube.com/watch?v=o5cxBMDezuU&playnext=1&list=PL927682907A9BA566

 

[fishinmedic]

Re: Having trouble starting 90hp johnson vro v4 after it is warm

Very same problem. I"m going to attempt to do this myself. I have the kits on order my question is, is the valve seat part of the float assembly as seen in here http://www.iboats.com/mall/partfind...gd_poid=109344&gd_row=57&**********=056458193 the engine is an 85 60hp evinrude.

 

[instantheet]

Re: Having trouble starting 90hp johnson vro v4 after it is warm

It's time for carburetor rebuilds (2). your needle/seat valves (2) are leaking loading the engine up.

You can thank oxygenated (alcohol) fuel requirements.

I have the same problem I also own a 1992 Johnson 90 hp on a 17 ft Thunderbird......motor runs Great but if it sits for while after running it is also hard to start......the strange thing is it don't do it all the time......I also had the carbs checked out an everything was good....been running like this for about 8 yrs now...