Stalling after short rides - Ex-500.com - The home of the Kawasaki EX500 / Ninja 500R
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post #1 of 10 (permalink) Old 7-15-2019, 1:48 AM Thread Starter
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Question Stalling after short rides

Hi everyone,

I was finally able to wake up the GPZ from its hibernation this weekend.

Problem was she wouldn't start. The cranks were blocked, so I assumed the engine was flooded (for whatever reason). Unscrewed the spark plugs, cranked and blew out the gasoline (a lot!).

Started the engine and let it idle for around 15 minutes (was burning some oil). No problems there, nice and smooth idling, only needed choke for the first 10 seconds or so.

Put on my gear and went for a ride. She was riding very well for around 5 km or so, good throttle response, no lagging etc. Then suddenly, the throttle went dead, typical "no gas" feeling. Switched on the reserve to be sure, but I knew she had gas left. Didn't help, engine stalled while waiting at a red light one km or so down the road (throttle response getting worse and worse between the first symptom and the eventual stall).

For some reason she wasn't getting any fuel. I left the bike there and continued the ride on the back of a friend's bike (we were going somewhere). Came back around 3 hours later with a full jerry can of gas. Tried to start her before doing anything else and she was up and running at the first crank.

So somehow, I guess the float bowl filled up through some kind of leak or something (?) and the engine had some gas to burn again. Drove it back home and stalled in front of the house (so pretty much the exact same distance). Same thing, starving engine.

I took off the tank, and screwed out the petcock. Tested the functionality (funny image, me sucking on the fuel line and my buddy sucking on the vacuum port) and as far as I could tell, it was totally fine.

I would assume the petcock is not getting vacuum from the carb?
What about this leaking, that it stands for a while and I guess fills up the carb float bowl so I can ride for a short distance?
Why did the gas flood into the engine like that over the winter?

Was thinking I could remove the spring from the little rubber petcock valve to check if it really is the vacuum?

I am quite sure it is some small/stupid/easy to overlook problem...

Grateful for any suggestions/help.

Cheers, Yannick

GPZ 500 1992 (EX500C1)
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post #2 of 10 (permalink) Old 7-15-2019, 3:58 AM
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You have to remove the gas cap. Then disassemble the cap. Remove the small orange disks in the cap. Leave the disks out and reassemble the rest of the cap, then replace the cap.
Those orange disks are vent "flappers" that are stuck and not letting the tank vent.
You can search the site for a thread entitled "The key hole is not the gas vent". I can't seem to find it, but it contains more detailed information.

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post #3 of 10 (permalink) Old 7-19-2019, 5:54 AM Thread Starter
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Hi bpe, sorry for the late reply. Wanted to come back to you either way because I would definitely not have found those orange disks on my one. So thanks for the help, spot on!

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post #4 of 10 (permalink) Old 7-19-2019, 8:21 AM
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Quote:
Originally Posted by Amplid View Post

Problem was she wouldn't start. The cranks were blocked, so I assumed the engine was flooded (for whatever reason). Unscrewed the spark plugs, cranked and blew out the gasoline (a lot!).
************************************************** ********************************
So somehow, I guess the float bowl filled up through some kind of leak or something (?) and the engine had some gas to burn again.
************************************************** ********************************
Why did the gas flood into the engine like that over the winter?
You've completely disregarded the root cause to your long term winter (and now continuing) flooding, stalling then starting after sitting.....the all important float system within the carbs.....they are both sticking while leaking.

You need to perform a proper carb service.

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post #5 of 10 (permalink) Old 7-19-2019, 9:29 AM
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Quote:
Originally Posted by ducatiman View Post
You've completely disregarded the root cause to your long term winter (and now continuing) flooding, stalling then starting after sitting.....the all important float system within the carbs.....they are both sticking while leaking.

You need to perform a proper carb service.
Additionally, I would bet you also have gas in your crankcase. Time to check the oil level, and be prepared for an oil change.

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post #6 of 10 (permalink) Old 7-19-2019, 12:39 PM
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Agreed...oil/filter change is an automatic both after proclaimed winter hibernation and especially vital in view of reported hydrolock/fuel issue. So automatic, I failed to even mention it, presuming (note careful use of word) it was done.

So @Amplid Did you perform oil/filter change? If so...good, if not.....bad.

I'd go further and suggest NOT to ride until the float issues are confirmed corrected AND the oil/filter changed. Fuel in oil can create major engine destruction (rod/main bearings).

“Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba....” quote Hunter S Thompson

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post #7 of 10 (permalink) Old 8-8-2019, 9:30 AM Thread Starter
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Oil and filter changed. Strange that the floats would be sticking, I did a complete overhaul of both carbs before winter (including the float needles) and haven't ridden since. Guess I will open them up again. Thanks for the inputs!

GPZ 500 1992 (EX500C1)
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post #8 of 10 (permalink) Old 8-8-2019, 10:56 AM
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Quote:
Originally Posted by Amplid View Post
Oil and filter changed. Strange that the floats would be sticking, I did a complete overhaul of both carbs before winter (including the float needles) and haven't ridden since. Guess I will open them up again. Thanks for the inputs!
Did you drain your carbs before winterizing?

I used to do that in the past, but some of the kids dirt bikes would get sticking float needles and dump gas on the ground until the floats were freed up. I now just treat the gas with Stabil 360 and leave gas in the tanks and carbs. No issues starting come Springtime.

*edit: Forgot to ask. Did you find fuel in the oil? Much?

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Last edited by Davenay67; 8-8-2019 at 11:33 AM.
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post #9 of 10 (permalink) Old 8-8-2019, 1:33 PM
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The above was supposed to be in the bike of the day thread,
Adm , please move it

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post #10 of 10 (permalink) Old 8-8-2019, 3:12 PM
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moved

“Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba....” quote Hunter S Thompson

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Last edited by ducatiman; 8-8-2019 at 4:13 PM.
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