|
|
Post by streetlancer on Apr 3, 2009 16:42:45 GMT -5
okay my scoot is broke down it will start and run for a little bit,then it back fires and dies and won't start right away again..I've replaced the ignition coil with the MRP recently,also got a new plug..I checked the plug for spark..and it looks like it is sparkin then it quits sparking  ..Im thinkin maybe it quits sparking then fuel builds up and that causes the back fires when the spark randomly does it's thing again...my carb is dialed in perfect it ran great before this started happening. So im wondering what the problem really is and i need to narrow it down soon because this is my only transportation... any help will be very apreciated... I may need a new electrical part ..maybe a magneto or CDI maybe i fried something out because i am wired direct with no fuse..i dunno i just can't figure this out ....and its frustrating me to death. |
|
|
|
Post by stradarx150te on Apr 3, 2009 17:08:55 GMT -5
You CDI could be bad or a loose wire
|
|
|
|
Post by brian8474 on Apr 3, 2009 17:23:00 GMT -5
I agree with stradarx.The CDI is probably the culprit.Check the wiring before you order a new one.
|
|
|
|
Post by stradarx150te on Apr 3, 2009 17:47:11 GMT -5
also make sure the green wire is on tight on your coil
|
|
|
|
Post by streetlancer on Apr 3, 2009 18:45:44 GMT -5
the green wire has good connection....and all the wires that go in the CDI are connected well also...So it likely is the cdi then right..I have 7000 miles on it..and i've pretty much upgraded everything on it but the carb...already so whats another 25-50 bucks...
Do the racing CDI's make a differance?My RPM where hitting 10,000 rpms on this one i have on...I dunno if i should go any higher lol...I have an A-12 cam, 24mm carb , MRP high output ignition coil,30 mm chrome intake,harley muffler,and High flow Air intake set-up,electric fuel pump,and 12 volt lawn mower battery from walmart.
|
|
|
|
Post by stradarx150te on Apr 3, 2009 18:49:29 GMT -5
|
|
|
|
Post by rocketdog on Apr 3, 2009 19:38:59 GMT -5
I agree. Bad CDI. Or perhaps a bad ground.
|
|
|
|
Post by streetlancer on Apr 3, 2009 22:08:43 GMT -5
here's another symptom..the battery went dead pretty fast. It had a full charge then it lost alot of juice after all this started happening....
Maybe the stator thing isnt working right..I have an oil leak on the bottom of my head from a bad gasket that needs fixed..Maybe it's covered in oil and it's causing it to not function properly...this may explain why i get a weak randon spark pattern..I think If the CDI was bad it probly wouldnt run period.
So im gonna chage the battery to full capacity and disconnect it after it is started.It should stay running from the stator right.if the stator isnt workin right it will die..It may have ran good until the battery went dead because it pulled it 's juice from the battery..
I havent ever disassembled the stator housing yet..i bet it's got oil in there though..and this may be the actual problem.the stator sends current to the CDI. and the CDI has a capasitor in it that send the current to the coil and then to the plug...
I'll post the results when I do it tomarrow if i get a chance...
Does anyone know how to test a CDI?
Or has anyone had there cdi go out on them?
I really dont want to hav to buy anything new yet until i am absolutly positive it is what i need.
|
|
|
|
Post by streetlancer on Apr 4, 2009 12:08:04 GMT -5
I trickle charged the battery overnight started it this morning.fired right up and runs great again...voltage reading seems good goes up while reving and stays at 12.7 at idol.
So I dunno what the problem was maybe it is a bad ground wire..i unpluged the CDI and inspected it everything looked fine pluged it back in.checked over all wires and they look good..so i dunno maybe it could still be the CDI,cuz i only ran it for about 30 minutes so far.maybe it'll mess up again when it gets hot or something...
anyone elese hav a theory???
|
|
|
|
Post by streetlancer on Apr 4, 2009 16:13:52 GMT -5
i found a wire coming out of my ignition that was disconnected and it looked like it was melted a little on the end...its the one that is black with a white stripe..i think this may hav fixed the problem...
|
|
|
|
Post by streetlancer on Apr 6, 2009 12:07:26 GMT -5
well I took her out this morning for an official test run about a mile into my ride..it started backfiring and dies...after a bit it started back up and got me about 30 ft and died again..had to push her all the way back home and every now and then i started it and rode another short distance until it dies again...
Conclusion:I didn't fix the problem obviously. I did a little research on CDI problems and one person said that sometimes when you max your rpm to the peak of your rev limiter.it can fry your CDI out. The last time it was running good I had my rpms at 10,000 rpm I must have hit the peak of the limiter and burnt it up.Guess i better get one that has no rev limit or something
..I think I've ruled all other possibilities out..
|
|
|
|
Post by harrywr2 on Apr 6, 2009 12:13:59 GMT -5
The last time it was running good I had my rpms at 10,000 rpm I must have hit the peak of the limiter and burnt it up. These engines aren't designed to run at 10,000 RPM. I'd do a compression test. |
|
|
|
Post by streetlancer on Apr 6, 2009 12:21:20 GMT -5
I havent took off my valve for a while...I had to put a shim in it around the cam bearing to fill the gap the my old cam made from the bearing seizing up..maybe my shim is out and im losing compression..?I don't have anything to check my compression but i think im gonna check that cam and see if maybe that is the problem..but i doubt it but it could be it..it may be cracked or something with my luck..
|
|
|
|
Post by kink on Apr 6, 2009 14:24:40 GMT -5
ok, i only skimmed this thread but do you have the stock coil and CDI? you could try swapping out electrica parts one by one for the stock ones and see if the problem is eliminated.
|
|
|
|
Post by streetlancer on Apr 6, 2009 15:11:28 GMT -5
my CDI is stock i just bought a brand new Coil but still have my old one and i know the old one still works because i had it tested...I checked my cam looked fine to me.it cant be the new coil because it did this before i bought the new coil..I think it's narrowed down to the CDI now..
|
|
|
|
Post by slowscootin07 on Apr 6, 2009 15:37:19 GMT -5
sometimes a CDI will work fine until it heats up and then it fails. After it cools down, then it is "fine" again. The only real way to test that theory is to swap it with a known working one. Be warned though, some CDI's do have a rev limiter on them so it may not perform as well thus making you think that it's not the issue when it really is.
|
|
|
|
Post by streetlancer on May 8, 2009 16:14:01 GMT -5
I bought my new cdi from http://www.partsforscooters.com..this one---> www.partsforscooters.com/Digital_cdi_gy6_169-114?sc=9&category=119698 Hooked it up and it wont start at all now...it says it's universal for all gy6 based engines.. when i hook my old one up it will start for a bit then die's.. when i hook upo the new one and turn it over i get nothing period. im thinking that maybe i need to switch the wires around or something.. on the four prong plug i only have three wires going to it..and on the 2 prong plug i have one black wire going to that.. Does anyone know about CDI's??? im clueless and i dont want to fry this one it cost 60 bucks ya know.. I have the lancer GSR |
|
|
|
Post by scootdoggydog on May 8, 2009 20:01:12 GMT -5
|
|
|
|
Post by streetlancer on May 9, 2009 14:53:50 GMT -5
thanks for that chart im gonna check my wiring ...i think maybe i need to take that kill switch completely off or maybe that is the cause ..i'll post results when fini shed
|
|
|
|
Post by pedez2000 on May 9, 2009 16:01:59 GMT -5
some gy6 scooter have ac or dc. i sold a few cdi's to members and others. that their bike would not start cuz of the cdi, and put mine in. stock and performance, and it started, and they shut it down, and cdi was blown.
i tryed to find it here but had no luck.someone thats a member here knows all about here.maybe they will chim in.
gregg
|
|
|
|
Post by streetlancer on May 16, 2009 11:30:08 GMT -5
|
|
|
|
Post by scootpup on May 16, 2009 12:23:07 GMT -5
The same thing happened to me.I fixed mine on my Milan, near the spark plug I have 2 separate wire plugs.One of them does not plug in to any thing.Look at the colors of the wires to make sure you plug the right one in.
|
|
|
|
Post by streetlancer on May 18, 2009 8:47:19 GMT -5
New problem....now ran fine for a while but i think it over heated...the other day...it shot fire out the tailpipe then just cut itself off....it wont even start now....It will turn over ...I cleaned out the carb...I checked the cam and it's fine...so now there's only one thing left to check for and thats spark...I just got this brandnew CDI so there better be spark there....It has got to be something I gotta get this figured out today.....It started after but dies out easily especuially when i come to a stop every time.....then it won't start at all ...im about ready to just give up period...lol it's a mind boggler on prob after the next ...always has been.since i bought it...
|
|
|
|
Post by streetlancer on May 18, 2009 10:21:07 GMT -5
ok i took the vavle cover off ..and switched my shims around...I had sum shims inbetween the top of the head and the cam bearing...and noticed my valve adjustment was way off there was a large gap there...... so here is what i did...
I switched the shims to the top of the bearing on the cam holder side..and adjusted the valves properly at the very bottom of each side I can wiggle it just a tad..don't have a gap indicater for presision..but only doin what i can..
I have strait LUCAS oil did a new oil change yesterday found the oil screen was plugged... hope that i didnt hurt the oil pump from that..i am waiting another hour yet to start it because the gasket sealer has to cure....and i have the battery on the charger....
the cam has no damage and bearings still lookin good..i bought a brand new CDI , High performance Coil and new plugs ....getting spark for sure now.....carb is getting gas...I checked that too...yesterday I checked for jet blockage and there was none...so
I think and hope it's just this cam adjustment that was off when i re-installed it...
the reason i had shims put in is because the first cam bearing locked up on me a long long time ago like 3 years ago and it spun out the ID size...on the one side where the beiring seized..so shimming it will fill in that lil gap that was left there....bnut what is best ??to have the shim on the top or the bottom?i forget whwree i had it last when i was running good ....looks like i'll just have to trial and error...hopefully i won't do anymore damage at least....
|
|
|
|
Post by pedez2000 on May 18, 2009 11:12:15 GMT -5
I SELL THOSE SAME CDI'S LIKE WE SPOKE ABOUT. MRP HAS BEED OUT FOR SOMETIME NOW.I SURE WISH THE CDI I WANTED TO GIVE YOU TO TEST FOR ME WOULD HAVE WORKED FOR YOU.THOSE CDI'S COST WAY TO MUCH TO GIVE AWAY FOR FREE.Do you have the 12 coil stator?
GOOD LUCK AND KEEP US POSTED.
Gregg
|
|
|
|
Post by Kaos on May 18, 2009 11:21:22 GMT -5
Please let us know what happens.
|
|
|
|
Post by streetlancer on May 18, 2009 11:48:07 GMT -5
well I got it started for a bit ...when i re-installed the cam and switched the shims around...and tightened it back down ...it is critical that i dont over tighten it..or I will snap the cam holder...so anyway i think the head is slightly gapped or the gasket it blown..because it made loud noise like compression was coming out the head...where it seats on the bottom to the engine..so i tightented it a lil more and it quit doing that....but in the process of that i touched a bare wire somewhere and fried a wire...so im going to have to work on that later tonight when i get off of work..take care i'll keep posting and sharing the results...
|
|
|
|
Post by streetlancer on May 18, 2009 23:55:20 GMT -5
I've checked everything im getting spark valves are set correct..getting gas to the carb checked jets again all good...battery fully charged..turn the key hit the start button....and NOTHING..not even a single fire ....
when it started earlier today... it made a loud bangin like the header was off..but it wasnt consistant firing ..sounded liek something blew or something...
Man i hope i don't have a hole in the piston or something...thinking maybe the timeing chain may that jumped ...any ideas dogs?
Im ready to just frickin give up and buy a new one n swap out my muffler n cam .
|
|
|
|
Post by streetlancer on May 19, 2009 10:33:13 GMT -5
found out what happened...timing chain slipped..due to worn out chain tension arms...valve opened when piston topped out...there fore damaging the piston rings ..likely and No compression..there is slight valve scuffs on the piston and on the valve..
solution get new rings and tension bars...DAMN DAMN ....grrrrrrrr
|
|
|
|
Post by streetlancer on May 20, 2009 23:32:35 GMT -5
new solution ...just get a new engine..
|
|
..Im thinkin maybe it quits sparking then fuel builds up and that causes the back fires
.
