WTF ?????????????????

[02 zx 50 s.f.]

  i was riding for probably about a good 20 30 min and then all of a sudden it just stopped. i let it sit about 5 min it started right up ran good the rest of the day and then at night it did it again but this time i was going down a bridge. i was full throttle both times on the scooter tac said 50-51 mph both times. i have comp gas oil this i know but i do have a aftermarket cdi now my stock cdi i derestricted and made my scoot haul ass then it fried so i bought a race cdi it gets me moving pretty fast but not like the other. it only happens when i'm at the 50 mark for a good time but the problem reminds me of when the stock one fried. is it possible that my scoot is trying to take more than it can get from my cdi. its almost like it just goes retarded. it does not lock up it just stops running and i have to wait to start it up. it also seems to run better when i am full throttle and let off a tad and get back on it but i have to do that non stop every couple of seconds to stay at 50mph.               

[zombie]

It could be the hi heat from long wot runs shorting the stator, or cdi. Try insulating the cdi with some sort of heat shield or relocating it a little. If that helps the problem is there. If not try a new stator. Could be a low float level too try raising the float just a bit. Also look inside the fuel nipple on the carb. Some have casting flaws that block the full flow.

[Peters]

Could be a low float level too try raising the float just a bit.

You're saying bend the clip up a little bit so the valve opens sooner right?. The fuel inside of the bowl is dropping "too" low? This may be the problem I've been having with my people. Just never thought of it til now.

About how long does it take before your scoot will start again? Shouldn't take but a few seconds for the bowl to fill up again.

[zombie]

The few seconds is why I think float, or fuel starved more than Ignition.

[Peters]

  Right

[wordslinger]

..is this a stock scootr??


..any mods??

..how many kms??

[02 zx 50 s.f.]

It's stok for the most part as far as parts just CID cvt belt case is open for the heat to be gone. Other than that just cosmetics

[02 zx 50 s.f.]

It takes a good 2 min

[02 zx 50 s.f.]

To start back up

[JustWantToRide]

Could be a clogged air vent on the gas tank.  Next time it happens pop the tank open and listen for the sound of air rushing in.  Then try to start it right away. 

It doesn't take 2 minutes to fill a float bowl (unless your fuel filter is clogged - so check it).  You could be overheating the engine, or you may have a slight flaw in the ignition that expands when hot and turns into a bigger problem...  Check the fuel tank venting, then the fuel filter... 

FWIW:  If it happens more on a full tank then it's the tank vent.

[zombie]

Agreed w/ Just want... Try riding with the cap loose. If not that then either the stator (more likely ) or the cdi( les likely)
I always buy both, and install 1 at a time, and test. 100.00 bucks will cover both

[02 zx 50 s.f.]

It holds the rev up whatever it is even when im riding and let off it sounds like I didn't. And it just sounds different altogether weaker it is felling ruffer when I ride

[zombie]

Are you saying it is reving by itself? Let off the throttle, and the rpm's stay? sh**ty running all the time?

[zombie]

Try the basics first. Compression test/Vacuum test. With out these your attempts are useless. To be rich/fouling, and detonating you have a vacuum leak in the cases. It would over heat, and die. Starting again as it cools. Do those tests.

[02 zx 50 s.f.]

Yes it's about normal 0-30 mph  but when the tac hits 43 and up it gets really rough it used to get to the 50 mark pretty quick and now it won't only when I'm going down a hill I know the rollers are bad just replaced the plug a d head gasget