thanks for your response but it runs bad with two different carbs one of them is new.It does the same thing with both ones.. The cns which ran good for about 8 months and so I thought it was the carb adjusted float checked jets and adjusted needle seats all of them...no better.So last week I put a new nt on same problem...
I'm stumped here.Please help!
- Thread starter wan37
- Start date
See post #4...
http://motorbicycling.com/showthread.php?t=27629
Sounds like it could be several things to me
1. Your timing may be off if your magnet has turned slightly on the crankshaft if the woodruff key is missing..
2. CDI or magneto is bad
3 Bad or loose wiring connections
Make sure you have that plug wire screwed in tightly to CDI black box
Did your bike get wet and is it wet inside the left side magneto cover?
TiM
http://motorbicycling.com/showthread.php?t=27629
Sounds like it could be several things to me
1. Your timing may be off if your magnet has turned slightly on the crankshaft if the woodruff key is missing..
2. CDI or magneto is bad
3 Bad or loose wiring connections
Make sure you have that plug wire screwed in tightly to CDI black box
Did your bike get wet and is it wet inside the left side magneto cover?
TiM
Well Tim It could be any of them that's what I'm thinking.I cut all connector off and soldier all of them and put heat shrink on them about a month ago .I think after that It started so last night I cut them again and connected crimp connectors that's were I'm at now.I will run it tomorrow and see.I also had a small light hook up and cut it too and caped it off about 2 weeks ago but didn't help either
Get a meter and check those resistance readings on the magneto windings. Also make sure on the back side of the magneto you use sandpaper and sand the shellac off where the ground is on the one bolt that goes through into the engine casing.
I doubt your problem is carb related if you got the same results with 2 different carbs
TiM
I doubt your problem is carb related if you got the same results with 2 different carbs
TiM
I'm wanting the engine to idle longer then I'll dial the rest in.My main thing is the idle,after I get it to start it will idle about 2minutes and then cut out and die.It sound like a little tap in the head when it cuts out and then dies.So I thought that the plug was hitting the piston,wrong plug looks good and piston looks good no marks,but once it dies its hard starting again and the plug is wet.I'm really thinking timing or coil.I think when I had the little 6volt head light hook to the white wire it over worked the coil.Any more Idea's.
Here's a place I found explaining how to test the cdi and coil with a meter: http://www.motoredbikes.com/showthread.php?t=20227 Set your multimeter to read resistance (ohms, marked with the omega symbol, set to 20-40k)
This link has all sorts of info about the ignition, including specs on the magneto windings and expected resistance you should measure with your multimeter for each coil...
http://www.grubeeinc.com/USA/Magneto Mystery.html
http://www.grubeeinc.com/USA/Magneto Mystery.html
I had a friend with a similar problem (I think). his would never start, but when it did, it would die again shortly afterward. I wasn't there mind you, but he told me he pulled the head off and found that his head bolts were stripped, he had a cracked piston ring, and his head gasket was ruined. He never did fix it, looking to buy another 66cc now. I hope this helps, if not, sorry for this post.
Definitely by a new plug an NGK toss the one you have now in a small tool bag for emergencies
P.S.very good observation about the under pressure spark or lack there of that happened to me once and after scratching my head , replacing the carb I bought a new plug "because it was the only thing I hadn't replaced yet" and sure as taxes and death it increased my power at take off , top speed even seemed to increase my fuel economy.
. For chits and giggles I put the old carb back on, and still ran just as good
all it was was the plug it showed spark but couldn't handle the pressure "No pun intended"
