ac resistor at fault? By pimp (Read 497 times)

[pimp]

hi all
just got my daughters cpi aragon on the road after replacing every component in the ignition circuit only to finally find out that the wires in the cdi block were not gripping the pins!
anyhoo since then she has used it a few times and it has got more issues, firstly when warm, the revs would not go down at tick over, checked for inlet leaks and finally looked at the enricher circuit, the auto choke worked well on a bench test, not on the bike. tested the bike from cold with the choke wires disconnected the result was exactly the same high revving as when the it was connected. the lights have been playing up too and i believe that they will be on an ac circuit the same as the choke?
tested dc voltage going to the battery and it measured 3 volts............. so tested power to regulator in one lead is at 40v the other nothing. bike has just had a new stator, could it be the ac resistor? anyone know what the value should be? im getting 11.4. ohms any help would be hugely appreciated.

[Alleyoop]

First off the ENRICHER you have it backwards, the enricher by DEFAULT not PLUGGED in or COLD will feed extra fuel to the motor. So when starting cold if the valves are adjusted right you will get a high IDLE when first started cold. THEN if the enricher is plugged in with the motor running it gets voltage to heat up the element and the PLUNGER will start to EXTEND and within 3-4 minutes SHUTS off the extra fuel. After this it is ONLY the PILOT JET that is feeding it fuel and the IDLE will should come down to where ever you have set it which for 50s and 150s is 1500-1800 rpms where ever it idles the smoothest and the rear wheel is not spinning.

If you tested the STATOR wires they should all register about the same at IDLE 20-30VAC and at say 4krpms 50+VAC. You have to set your meter to VAC not DC.
Alleyoop

[pimp]

hi there
got to the end of this issue, it was that i had put the earth to the coil from the cdi to frame earth, i am used to working on larger bikes with dc systems. i think you may have misunderstood what i was saying with the auto choke, i was testing to see if i had the same effect when plugged in and unplugged to prove that the fast running state continued under both situations proving that the enrichment circuit was not shutting off.i am quite handy with a multimeter and was using vac. i have built large custom bikes and trikes for 30 years and run my own parts service now, just not had much to do with small chinese scooters. i do however run a honda sh50 in a local moped racing series and have made some radical changes to the engine including porting blue printing piston and duration mods. its a bit of a long term project but increases performance all the time. could upload some info if you like. (ijunked the ac system and run a dc total loss system using ni cad drill batteries) saves on drag in the stator.