Roketa 150 gy6 motor dies at speed By cruisethescoot (Read 9,980 times)

[sprocket]

You get on it and it dies? Or do you mean you give it throttle and it dies...

Still sounds to me like the carburator...

[cruisethescoot]

I start driving and as soon as I give throttle under load, it dies. I'm going to try cleaning the carb again.

[cruisethescoot]

If I knew about explosives, and had some, my POS scooter would be in 4 billion pieces! I cannot for the life of me figure this stupid thing out.

So, I cleaned the whole carb again (and fixed a faulty brake light switch that crept up by the way), checked all the connections I could find, and verified my spark plug worked by hooking to my car (not recommended, I got a pretty good jolt). After all that, it started working like it used to. I got on, rode around, waiting any second for it to stop working again. Remarkably, I made it around the block several times, and decided to venture out into the world. Drove some more, reminding myself of how much fun it can be. Got to the bank and cashed a check. Was gone no more that 3-4 minutes, and came back to NOTHING! Damn thing wouldn't even try to start! Cranked a few minutes until the battery died, and started pushing it back to my house.

I really can't understand why the problem is so intermittent. How can it run so well one minute, then completely crap out the next? I have yet to even determine if it is an electrical problem or a mechanical one, since it seems I have had problems with both.

On top of all that, I think back to when I first had problems, and remember that it came out of nowhere. One day, driving it home from work, and BAM.....no workey.

I will now accept you sympathies, and will continue to beg for some insight as to what the $@*%^@! problem is.


P.s. after writing the last part, I went back to my garage (since my batter has been charging for a bit) and started cranking again. Still no workey. So I get curious, and pull the spark plug. For some unknown reason, it is not firing. However, that reason must not have existed an hour ago, because I was riding around......Urge to kill rising.......

[cruisethescoot]

Ok, so more updates. I let the battery charge another hour or so, and went back out to check. Spark plug was firing, so I put 'er back in. Started cranking, and it took about 2 revolutions to start right up.

Is there some kind of cutoff for when the battery is low? I dont understand why just letting it sit and charging the battery would make the spark plug work. Doesn't the spark come from the stator?

-More confused than ever

[sprocket]

Check the valve gaps...to rule them out as the problem.

Could be a bad pick-up coil or CDI or ignition coil. Some times they work, but when they get hot they can fail...

[sprocket]

Yes, the battery had nothing to do with the running of the scooter...NOTHING!!!! so it isn't the battery causing the issue...

Scooters run on AC power direct from the stator...

Here are the valves for checking the stator on a 150cc

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[cruisethescoot]

I have tested the stator output and the pickup output several times, and both read in the acceptable range. I can't get to the stator to check for shorting, because I can't get the cover off. Everything I can get to and can check seem ok. I replaced the ignition coil and the CDI the other day, so that can't be the problem either, I think.

By the way, that pic you have is awesome! That really helps me to understand what is going on. Ok, the stator cant be bad, because when I run the scooter, the lights always work. They even work when cranking, so it is producing power. I don't know what R/R is, for the yellow and white wire, but those dont affect the spark, so that can't be the problem either.

Also, when I had the engine apart again recently, I rechecked the valves and they are set at .004 and .005

[sprocket]

>>>I don't know what R/R is, for the yellow and white wire.

rectifier regulator (R/R) There are about 20 different kinds...

Did you have the cam chain off the cam sprocket? You may be one link out from TDC...

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[cruisethescoot]

No, I never took the cam chain off, so it cant be that.

So, I was out riding just now, and I made is a few miles (probably just long enough to really get warmed up, and then when I hit the throttle hard (just to see) it died. After a few seconds, I was able to get it started again. This is promising, because it points me back to a mechanical prob, i.e. carb. I am considering buying a whole new carb unit, rather than trying to tinker with a stock one.

Any suggestions on where to get a carb that is better than stock, and more reliable?

[sprocket]

No... use a stock carb. There are what are called flat slide carbs from Mikuni, OKO etc, but they require alterations to the throttle cable and are a pain to tune...

[sunlproblems]

i had a sometimes spark as well if i just moved the cdi canection a little bit it would spark again so i rapped a wire tie over the plug and around the cdi to hold it tight seems to be working just fine now so i would try that as for the carb your still out of ajustment so i would go 3 turns out on it thats where mine runs the besti had the same hit the gas stall out issue as well mine is a 250 but the same no matter what size you ride good luck allyoop is the carb man pm him he will help you out

[cruisethescoot]

Well, I was riding again for about 5 min when the engine stopped. I pushed it home and found the spark plug not working. I didn't change anything or do anything, and about 15 min. later I cranked again and it worked. I really have no idea, and it negates my previous idea about it being a carb problem.

Just a thought, it is possible to somehow bypass the wiring to test the intermittent issues?

[Alleyoop]

Have you checked the wires that connect to the COIL coming from the CDI. They maybe loose and or real close to each other and may be grounding out after some movement like going over a bump.

Start it up and at IDLE start moving wires around a little to see if you can make it stall out.
Alleyoop

[cruisethescoot]

I have checked so many things, I don't really know. I will mess with those wires, and see what happens.

[cruisethescoot]

I have officially diagnosed my scooter as having T.I.E.I, (pronounced tie-eye), which is temperature induced electric infertility. I was idling my scooter in the garage with the battery disconnected (I know, I know, it shouldn't matter...) and it ran fine for about 10 min. I revved the engine, braked, used the turn signals, everything I would normally do while driving. Then, after all that I was back to idling and out of nowhere, the engine stops.

I seized the opportunity to test a theory, and removed the spark plug; my TIEI was all but confirmed. I know of no other established diagnosis in the scooter field that fits all the symptoms.

If you can tell me why my spark would be present one minute, and then stop for no apparent reason, you get a gold star.