odes 50cc have fire and fuel,wont start By chris423 (Read 2,790 times)

[chris423]

i have a 2004 50cc odes scooter,,i went through 3 cdi boxes,finally have spark,,and plug was dry tried cleaning card plug was still dry, bought a new carb and have fuel on the plug seems maybe a lil too much,,have checked electrical timeing and mechanical timeing and valve tentioner bolts and have 150 psi on my compression check, all is good..but still wont start..it pops like a small backfire but just wont start..plzzz help..thanx much..

[sprocket]

You may have spark, but perhaps not ENOUGH spark...

If you went through 3 CDIs it points to the stator... or the pick-up coil...3 CDIs wouldn't be bad, but they may not have worked because they didn't get sufficient trigger voltage

Check your stator voltages...

[Bashan]

Well said by the learned and sage Sprocket. Get us multimeter values for the red AC power wire, the blue trigger wire, check your coil feed connection and ground, and check your engine ground too. When you hold your plug on the head and crank it is it a nice bright blue or kinda orange? Lets rule out the electrics and then well look into some other things. Rich

[chris423]

thanx guys..i have checked the ac voltage from the motor,the red wire is like 90v ac and the blue was like .9v ac..and my motor is gronded good or eles my electric starter would not work well enough to turn the motor over,and i have a really strong blue spark..im normaly pretty good at this stuff but im at a complete loss..the reason (maybe) i went throygh 3 CDIs is that one was the original and the second was a friends and his scooter didnt run iether and the 3rd wich worked i bought new..but as i say i have sufficient spark i think, and there is plenty of fuel on the plug..i have too much time in this thing to give up on it now..

[chris423]

rich and sprocket..thank yall for ur time and help..chris

[Bashan]

OK, you did the electrical tests, thanks, that's off the table. Try this simple test. Take the vac line off the runs to the intake manifold, spray some carb cleaner in there, reattach and crank it. I won't say it'll run great just see if it makes a difference and what it does. Sorry this takes so long, forum repair is a slow process. Rich

[sprocket]

I would set the valve gaps at this point...after doings Rich's vacuum line test...

You have electrics, so it is fuel, compression (valves) or air intake (plugged air intake, filter etc)

[chris423]

i will try that and let u know what happens,and i dont care how long the proccess takes long as it runs..
thanx guys..will starter fluid work?and is 150psi compression ok,or is that too much?

[sunlproblems]

its okey about mid range check your fuel pump petcockvalve should be the issuie