lost power then died !!  By  ftwkirby (Read 1,114 times)

Hello,

If you have access to starter fluid - squirt a bit down the carb throat. --> if it starts and then dies you have a fuel problem.

If its a fuel problem diagnose as follows :

1.) is fuel in the tank - if no - add gas .....if yes go to 2.
2.) is fuel making it to the fuel pump - unplug fuel pump (side going to carb) - - attach a spare hose to the fuel pump and run the hose from the fuel pump to a jar or can - press starter button and hold for 10 - 15 seconds to see if fuel is pumping gas. - if no then check fuel filter between tank and pump ..... if yes, reattach original fuel line to fuel pump and go to 3.
3.) TURN "OFF" the run button so it will not start. Then "hold throttle full open" and hold the starter button for 5 - 15 seconds. Smell around the carb for strong gas odors - if no fuel is smelled then its a carb problem.

this is a basic fuel supply check.

The fuel pump is vacuum operated - check for vacuum hose leaks - all vacuum hoses - EVEN THOSE THAT DONT GO TO THE FUEL PUMP.

This is a good place to start since it was running.

Combustion / explosion in the engine chamber needs three things --- Air (breather / filter), fuel (gas), fire (spark plug)

report your findings and maybe I or others can offer the next steps depending on your results..

Just read your reply from yesterday,
YOUR STATEMET :
"thought it was a spark plug issue i found it to be very dirty so i cleaned it. tried it and didnt spark so i just ran out and got a new one but i got the same result no spark."

So.... No spark, No fire.

When you check it for spark did you do it like this / with the ground ?? (see video in this link) :


This guy has great vids - his you tube home page is below and applies to 50cc - 150cc (Even though he uses the 50cc in most of his videos) : Link ---> www.youtube.com/channel/UCUxvvD_DC7kkG4OiS2S_B7g

Although forums like this one offer more interaction / idea swaps / ect - which gets you to the videos posted above -- so don't drop your login / password & share what you learn.

Another pertinent vid by another guy for electrical diaganostic is here :


These should help you eliminate some other issues since the spark is new - and properly tested & gaped.

Hope this helps - I will re-check thread tonight / tomorrow morning.

It is common for a ground wire to come loose so I would first check the wiring . Has it been going out but still run or die all of the sudden ? Got a spare CDI to test ? On my 2T the crappy boot kept coming off and the spring broke off . I had been unscrewing the cap off off the sparkplug tip but after the spring broke I had to put in back on and jam the boot on . I bought an orange coil and wire combo from Scrappy Dog and it was new again . It would run but fizzle . No fire could be CDI , coil , crank trigger , bad run/kill switch etc so you will need to run a continuity test and see where the flow stops at .

I would do the starting or carb cleaner spray test after I tested for fire and it was good .

When my bike did this it was a catastrophic stator failure (it failed mechanically) 

Thanks For Link To Manual.

Is the KILLSWITCH in the run position? Do you see any wires going to the SIDESTAND if so that is also a KILLSWITCH. To eliminate the CDI being grounded take the KILLWIRE off the CDI.
Alleyoop

Easy to test both, the power wire from the stator cranking should read anywhere from 30+Vac and the Coil cranking should read anywhere from .05-2.5v.
Alleyoop