Dies on bumps

[mahall665]

I recently got my '84 NQ50 up and running. After cleaning the carb twice, it seems to run ok. However, it dies whenever I hit a large bump. Bouncing the rear end, while moving or not, makes it want to die. Any ideas?

[scooterwerx]

loose wires?

[ALOW1]

loose wires?

I second that. Make sure the plug wire is good and tight on the end of the plug. I had a similar problem with an Elite a few weeks ago.

[kentdog007]

My 86 Spree will "Bog" right out when I hit a good bump or dip. I am usually WOT when it happens so I loose speed and then eventually it works it out. Replies to my posts on the subject suspected a sticky float; I suppose that it could be enough to flood it out.

I am not in the mood to rip apart my carb so I have been toughing it out and swirving around those bad potholes! Good luck.

[apephoto222]

the needle or the float maybe.

[mahall665]

After some more experimenting tonight I have narrowed is down to gas. I jostled every wire i could find while the bike was running and not one hint of stuttering.

I took it out for a test drive and purposly hit a few bumps. If the throttle is applied while hitting a bump the enigne continues on like it never hapened. But if you hit that same bump off throttle "idling", it will die immediately.

Then I tested it at a stand still. I lifted and dropped it a few times while on the stand and the engine didn't phase. I dropped it off the stand -- it died.. So now i'm thinking the wheel has something to do with it??

Finally, I grabbed the handle bars and shoved it forwards and backwards real quick.....the engine dies. So it has to be some sort of "G" affect flooding the engine??? But how does that explain the engine not being affected if the throttle is applied? Ok, so then I lifted the back end so the bike was at a 45degree angle and the engine died...I'm at a loss...help

Not sure what the reed does, but could this faulty? I checked the float & needle and they don't seem to be sticking.

[Kenny_McCormic]

It's in the carb, try a new float and needle, polish the seat.

[Wheelman-111]

Greetings:

The float may be a-sticking, but I'm not satisfied with that explanation. When the float needle closes, the engine runs for at least a few seconds on the dregs in the bowl. It should not shut down on impact.

It still sounds electrical to me. Check the wires to the coil. Make sure the coil itself is mounted securely.

[Kenny_McCormic]

Float slams down and fuel level gets too high, mixture gets rich quick.

[Wheelman-111]

Greetings:

When/if the float "slams down" it may briefly open the needle valve. I'm not sure if gravity can overcome buoyancy anyway but let's go with that. Agreed that it's not a bad idea to check the fuel system theory, but I'd still check all wires before pulling the carb again.

[PimpinSpree]

does it just all out suddenly die, or does it bog down and run like crap and then die

[mahall665]

It dies right away.

[Wheelman-111]

Greetings:

This is a long shot but let me ax you:

Is your ignition key on a ring with 5 pounds of other keys for every door in the Asylum?

If so you may have found your problem.

[mahall665]

Nope, no key chain, only have the one key.

Could a bad reed have something to do with it? I must admit I have no idea what the reed is, what it does, or how to check it..

[Clivester]

Not likely the reeds. They are too stiff to be affected by a bump like that (or change of inclination). They get, and withstand, quite a hammering in normal use. Only way I could imagine them being related is if there was a loose object in the reed cage but then they would be likely to run like crap more often.

Have you checked to make sure there are no cracks or loose fittings around the carb manifold or airbox that could open up when the scoot is jarred?