Roketa 250cc-MC54- no Spark. By tinatinu (Read 10,916 times)

[Luke]

welcome tina! just stick to this forum, forget about that other forum.(oooops,good i didn't mention any forum name,i'm safe,lol)

[tinatinu]

hello JR,
i got new CDI. Let me check everything u said, and feedback for you tonight.

[JR]

OK and tinatinu I'm going to move this to the 250 section.

JR

[tinatinu]

hi JR,
iam so busy this week that why i feed back for you late. I going to do it on Sunday. Can you show me how to check Ignition Coil good or Bad with Volt meter ?
Thank you so much.
Coleon.

[tinatinu]

Hi,
The new problem occur. After i did test u teach me. Test 6 not work. Then i try to plug in old cdi in wires : i plug 3wires first, and then 2 wires, and i heard and saw the spark out in Spark plug. Everything i turned on(key, kill switch eng).
I want to notice u know about it.

[JR]

OK tinatinu here is a copy of test 5 and 6 with your volt meter hooked up to the gray/white and green wires;

(5) Now with the volt meter still hooked up to the wires I told you TURN THE KEY ON, you should immediatley have NO OHMS RESISTANCE
(6) Next with the KEY STILL ON and with the volt meter still hooked up to these two wires turn the ENGINE KILL SWITCH OFF or to the engine off position, you shourld immediately get OHMS RESISTANCE.



Now let's be clear you have the volt meter hooked up to the gray/white wire and green wire and test number 5 works.

Then with the key in the ON position you turned the engine kill switch on the handle bar to the engine off postion and you had NO ohm resistance? If so this switch is bad or a wire has come loose on it? Jiggle the switch back and forth with the volt meter still hooked up and see if you get ohm's ressistance then and remember to have the key on.

Also now that you seem to have a spark check to see if it's a good spark blue and steady with the spark plug grounded to the body and turing the engine over?

Two things now come to mind, you've got a bad or corroded engine kill switch OR you have a wire loose such as this gray/white wire and it's touching ground somewhere. Remember this wire is the kill wire to the CDI. if it's grounded out anywhere then the CDI WILL NOT SPARK!

Actually amnother thing comes to mind it's not common but the key switch could be failing as it's not disengaging on the engine kill side with the key on?

Remember the key ignition switch is a two way switch as in normally open and normally closed. With the key off the switch is open on the 12 volt DC side and closed on the engine kill side so if one turns on the key and the normally closed engine kill side doesn't open the the CDI is grounded out thus no spark.

Since you've had a spark show up we are on the right track, there's a gremlin in the system now we got to isolate it.

I'll check back in later.

JR

[tinatinu]

hi JR,
do you think the problem can came from i changed new piston and Valves ?

[JR]

Well with Chinese wiring it's easy sometimes to knock something loose, that's whay one neds to secure all the wiring out of the way and check things closely when puttinf it back together.

So now my question is do you still have a spark right now and is it a good steady bright blue spark? If so then you either had something not making good connection and changing your CDI made this poor connection go away or again you possibly have something intermittent that is coming or going? Electrical shorts can be that way sometimes and movement can cause them to reappear.

JR

[tinatinu]

so tired and dont want to Fix that more. So, anybody want to buy it and can Fix that, let me know, only 600$.

[tinatinu]

Nov 20, 2011 20:21:42 GMT -6 JR said:

Well with Chinese wiring it's easy sometimes to knock something loose, that's whay one neds to secure all the wiring out of the way and check things closely when puttinf it back together.

So now my question is do you still have a spark right now and is it a good steady bright blue spark? If so then you either had something not making good connection and changing your CDI made this poor connection go away or again you possibly have something intermittent that is coming or going? Electrical shorts can be that way sometimes and movement can cause them to reappear.

JR

no spark right now sir.
so tired with that, and dont know what is going on with that.

[tinatinu]

i thought 2 things :
1/ i have some mistake when i change new Valves and Piston.
2/ it has some wires connect together somewhere.

[alleyoop]

Tinatinu,
Just a thought when your checking for Spark are you holding the Spark Plug on the Engine or FRAME? Have you tried holding the Spark Plug to the FRAME? It may could be that the GROUND WIRE from the Engine to the FRAME is NOT making a good connection.

See if you get a SPARK if you hold on the FRAME.

Changing the Valves and Pistion will not effect you not getting a Spark.
But since you had to take the cam off it may be out time BUT the Spark plug would STILL SPARK but just at the wrong time.
Alleyoop

[JR]

I will say this you need to make sure the engine is grounded. It should have a jumper wire bolted on the engine to the frame and if it doesn't then put one on.

JR

[tinatinu]

hi,
i take a picture on engine. can you check it for me ?is that Eng ground ?
picasaweb.google.com/110246837535726191977/November212011?authuser=0&feat=directlink.
i connected it with wire bolte. how can i check it Good or bad, sir ?

[JR]

No that looks like the engine temp sensor plug in. Simply put a good gauge wire from the frame where the battery negative wire bolts to the frame to a place on the engine where you can bolt it on. Preferably the wire needs to have crimped on or soldiered on eye ends to make it easy to bolt on. The engine must be grounded if not that can stop you from getting a spark or make it erratic.