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Johnson 2005 90 HP Stall When Throttle UP In Gear

B

bronx68

Member
Engines starts fine and idles fine. When I rev up the engine in driveway on hose it is fine. Problem occurs on water when in gear and try to throttle up. It then stalls out. It will start up fine and idle fine but stalls when idling up in gear. Gas is from last year and I'm not sure how long since gas filter has been changed since I just acquired the boat. Could this be old gas problem or fuel filter? The gas was treated with stabilizer and Starbrite gas treatment.
 
start with simple things as cleaning the tank with fresh fuel, add new scenty and fresh gas and change the fuel filter as a preventive insurance
 
I don't believe in the fuel stabilizers, i think they do the work if someone has big engines and $100+ on gas and they don't want to throw away that old fuel... that is not our case with our small engines, they are always running with fresh, scenty, sparkling, flammable rich fuel... I missed the point... hehehehe :)
 
you have a 90hp and every time you ride you spend 100 bucks on gas? you are a hell of a rider! :)

install a in line filter that is just cheap insurance...
 
No I don't spend that much each ride.....just saying with price of gas $100 won't go very far anymore. Line filter is on order
Thanks
Ray
 
Hi,

I have the same motor and have had the same issue for the past two years. This is really coincidental because I have not checked in on this forum in a while, and I happened to go to the local marine service center down the street today to get an H2O / fuel filter cartridge and plugs, and I asked the long-time owner about this same issue.

My motor is carbed, I assume yours is as well. My motor will be OK at idle and in low gear for a time, then suddenly it will stall out, or bog down when I go to give it gas (throttle up). Whenever it stalls, it will start right back up. It runs great when the RPMs are mid to high range. It's just that idle / low RPM period where I get the stalling or bogging.

Now, I'm not a marine mechanic, but I have pretty good mechanical comprehension. The way the guy explained it to me today when I asked him was, in his experience, that the "old" carbed 2 stroke motors are really finicky at idle. Everything has to be set just right in the chain of fuel movement through the carbs, or else they can flood and get choked out temporarily. He said that with these motors, they have gone to some plastic components that don't neccesarily do too well with warping, ethanol in the fuel, etc., over time. Just the nature of the beast. He said you really have to do some "old school" carb adjustment to fine tune the system. This involves knowing what to look for and in what sequence things are happening. Also involves in-water testing - can't fix it just on the hose.

I'm hoping to get through this season and have him take a look in the Fall. I would appreciate any other opinions or comments on the subject. Thanks and good luck with your motor.

Dave
 
Dave,
Please stay in touch and I will do the same. I brought the boat down to a mechanic yesterday. His first impression is that it is either water in the gas or dirty carbs but needs to do some further testing. My boat doesn't have a water separator on it and it sounds like it would be a good idea. I previously had a 90 HP Evinrude (1993) and never had any problems except the bendix on the starter.
 
remember guys, simple checks first as always and when troubleshooting ALWAYS start from the most simplest thing involved in the problem and then moving along inspecting and verfying carefully to the more complex thing...

For me IMHO, water/gas separators can bring you problems in the future, as we have small boats, it is better to have always fresh fuel in the tank and check for leaks or water ingress in the tank...

Dave, these engines when properly maintained, they are bulletproof, the system doesn't need tweaking or using old school stuff to tune these engines. In some cases I have seen Evin/Johns in a fair maintenance condition and they keep running somehow! But for safe boating for you and yours, a practice on maintenance is a must.

The drain plugs on the carb bowls are a wonder, depending on the time the engine is not used, you can drain the bowls to avoid the water ingress to the carb needles "sometimes condensation affects the carbs" and if engine is not used for a long time, complete carb cleaning is better...
 
Here is what fixed mine. Cleaning the vapor separator and fresh new gas. I hope this helps someone else with a similar problem.
 
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