550 that stalls when it is hot - Yamaha Grizzly ATV Forum
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post #1 of 5 Old 04-07-2019, 10:03 PM Thread Starter
 
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550 that stalls when it is hot

I have a 2013 Grizzly 550 EPS.


Old gas was left in it. This was another thread in itself. Stabil and fuel injector cleaner was put in it and run. It wasnt the right thing to do. Well it caused a no start situation. The old gas was removed. A new plug was installed and it restarted. Fresh gas with Seafoam was run through it several times. At first it would not idle at all. It would start but not stay running.

However, after a few tanks of fuel with seafoam the situation has improved. I can start it. It will idle and stay idling for a certain amount of time. I would guess until it warms up. It will immediately restart and if I feather the throttle it will take off an go. Sometimes I can slam the throttle and it will go. Sometimes if I hit the throttle too aggressively it will sputter and stall.



The situation now is that if I run it until it gets hot, it wont stay running at all. It only stays running if I am on the throttle pretty good. If I back off the throttle to just crawling speed it stalls. If I try to get it too much throttle it stalls.


Today I was running it for a little while and I gave it gas and it backfired.


I know there are a bunch of threads on idle issues with the 700 and such but this is a 2013 550. In addition this is more than an idle situation. I cant let it get anywhere near an idle and throttle is not responsive when it is warm. Heck it is not responsive any time some of the times.



Should I change the plug again?
Should I do some time of intensive cleaning?
Should I use fuel injector cleaner?
Is there something I should check or take apart and clean?
Is it possible that there is more than one problem in play here?



It is almost impossible to drive once it gets warm. Any help is greatly appreciated.
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post #2 of 5 Old 04-08-2019, 09:35 AM
 
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Start by

Check the fuel tank venting.
Pull out the fuel pump check and clean the screen/filter.
Check the fuel pump pressure.

Also is the air filter clean?
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post #3 of 5 Old 04-08-2019, 09:56 AM
 
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Have the valves been checked/adjusted?
I think you have more than one small problem building to your situation.
A few years ago my buddy bought a used 660 (I know yours if E.F.I. and all but small engines are mostly the same) that spit and sputtered the first couple rides until the bike was A.P.O.S. and my buddy was about to sell it. I told him it needed a full tune-up, and that he couldn't sell it the way it was so......
The bike belonged to a rancher that probably fill the tank using a bucket and didn't always replace the gas cap between fill-ups.
We washed the dirt from air-filter, removed the gas tank to get to the valves and removed the plug to easily find T.D.C. to check the vales lash.
The rancher had installed the wrong plug, but I keep extras around for a 660.
We adjusted the valves, cleaned the gas tank and pet-cock, installed the correct plug, oiled and installed the clean air filter and put the 660 back together.
The 660 purred like a kitten and we took her for a long ride to test'er out doing this....
https://oi1361.photobucket.com/album...ps3b21305e.jpg
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post #4 of 5 Old 04-08-2019, 11:44 AM Thread Starter
 
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Quote:
Originally Posted by reogem View Post
Start by

Check the fuel tank venting.
Pull out the fuel pump check and clean the screen/filter.
Check the fuel pump pressure.

Also is the air filter clean?

I checked the air filter and it looked clean. I am going to clean it.


How do you check the fuel tank venting? Are you checking to see that there is no blockage?


Am I checking for a certain amount of fuel pressure or just that it is pushing fuel?


Thanks for getting back to me
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post #5 of 5 Old 04-08-2019, 11:46 AM Thread Starter
 
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Quote:
Originally Posted by Ridgway81432 View Post
Have the valves been checked/adjusted?
I think you have more than one small problem building to your situation.
A few years ago my buddy bought a used 660 (I know yours if E.F.I. and all but small engines are mostly the same) that spit and sputtered the first couple rides until the bike was A.P.O.S. and my buddy was about to sell it. I told him it needed a full tune-up, and that he couldn't sell it the way it was so......
The bike belonged to a rancher that probably fill the tank using a bucket and didn't always replace the gas cap between fill-ups.
We washed the dirt from air-filter, removed the gas tank to get to the valves and removed the plug to easily find T.D.C. to check the vales lash.
The rancher had installed the wrong plug, but I keep extras around for a 660.
We adjusted the valves, cleaned the gas tank and pet-cock, installed the correct plug, oiled and installed the clean air filter and put the 660 back together.
The 660 purred like a kitten and we took her for a long ride to test'er out doing this....
https://oi1361.photobucket.com/album...ps3b21305e.jpg

I am going to check all of this. Thanks for getting back to me.
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