My bike motor won't start. It only has 65 miles on it. I checked the obvious things. There is gas in the carb, there is spark at the spark plug. Clutch seems to be working as it should. Not only does it not start, but now it's backfiring when I try to start it. Any suggestions?
Almost new motor won't start
- Thread starter duanemyers
- Start date
Don't forget to flick the kill switch a few times. Try starting without rolling the throttle and with the choke off.
If that doesn't work then wait for more expert advice.
If that doesn't work then wait for more expert advice.
As Chaz says, push the kill switch while trying to start. Did you take the magneto rotor out? If you put the magneto rotor in backwards, it can cause a no start condition or backfiring. It might have been installed at the factory wrong
Also, make sure you don't have the choke on.
Here's a couple no-start guides:
https://docs.google.com/document/d/1aBeJuoS--VQWwXysc07rpscTUbPzgc93xjiQBgsyFjc/edit
http://www.grubeeinc.com/USA/2 cycle engine trouble shooting guide.html
Here's a guide from Grubee on magnetos and how to properly install the magneto rotor:
http://www.grubeeinc.com/USA/Magneto Mystery.html
Good Luck,
Chris
AKA: BigBlue
Also, make sure you don't have the choke on.Here's a couple no-start guides:
https://docs.google.com/document/d/1aBeJuoS--VQWwXysc07rpscTUbPzgc93xjiQBgsyFjc/edit
http://www.grubeeinc.com/USA/2 cycle engine trouble shooting guide.html
Here's a guide from Grubee on magnetos and how to properly install the magneto rotor:
http://www.grubeeinc.com/USA/Magneto Mystery.html
Good Luck,
Chris
AKA: BigBlue
If you were using 16:1 like the "instructions" say, your plug may be fouled.
Switch to 32:1 and clean or replace the plug and see.
Switch to 32:1 and clean or replace the plug and see.
Thank you for all your suggestions.
Replaced spark plug, still doesn't start.
Disconnected kill switch, still no luck.
Haven't taken the rotor out. It ran yesterday but not now.
Have tried starting with no choke, 1/2 choke, full choke, no luck.
The backfiring seems to have stopped but still doesn't start.
Replaced spark plug, still doesn't start.
Disconnected kill switch, still no luck.
Haven't taken the rotor out. It ran yesterday but not now.
Have tried starting with no choke, 1/2 choke, full choke, no luck.
The backfiring seems to have stopped but still doesn't start.
There is the possibility that you've sheered the woodruff key on the magneto rotor and your timing is way off. Remove the left side cover and see if the keyway in the rotor (magnet) lines up with the one in the crankshaft. With the piston at TDC (top dead center) the keyway should be at the 1 o'clock position on the crank and rotor.
Let us know what you find.
tom
Let us know what you find.
tom
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You said 65 miles on break-in. Well have checked the head to see if needs to retorqued? It's definitely that time by my experience. If you're losing compression it will not start .
2door,
It does seem like a timing issue. I will check the rotor, crank, etc after work today. Thanks.
It does seem like a timing issue. I will check the rotor, crank, etc after work today. Thanks.
Huffydavidson,
Yes, I have re-checked all nuts, bolts, and screws. Everything is nice and tight.
Last thing I did yesterday was to try and start it without the muffler, thinking it may be clogged. No luck.
Yes, I have re-checked all nuts, bolts, and screws. Everything is nice and tight.
Last thing I did yesterday was to try and start it without the muffler, thinking it may be clogged. No luck.
May have found the problem. When I pulled the boot off the spark plug, all these parts came out. That's bad, right? LOL Question: Can I just buy a boot or do I have to replace the whole coil?
Attachments
Get a section of car wire with the boot on it. Unscrew your wire from the cdi box (It might be glued and require careful digging out) and replace it with the car wire and boot. Just be careful not to break or damage the screw post in the cdi box and it is an easy upgrade.
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Check your local motorcycle shop do you usually get an NGK boot for 5 bucks they screw on clockwise .
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Go to an auto parts shop and buy a new lead and boot. It's a cheap upgrade from the stock even if it's not the no start problem.
I'm sorry to say the new plugwire & boot didn't fix the problem. It still won't start. Here is a list of things I've tried-
DISCONNECTED KILL SWITCH
CHECKED THROTTLE OPERATION
CHECKED CLUTCH LEVER OPERATION
FUEL FLOW FROM PETCOCK IS GOOD
BLACK & BLUE WIRES FROM COIL TO MAGNETO ARE SOLDERED AND SECURE
TIGHTENED ALL NUTS, BOLTS, SCREWS
REMOVED/CLEANED/REPLACED CARB, NO SIGN OF DIRT OR WATER
CHECKED AIR FILTER
SPARK FROM SPARK PLUG IS GOOD
NEW NGK SPARK PLUG
NEW PLUG WIRE
TRIED TO START WITHOUT MUFFLER
ADJUSTED CLUTCH ARM TIGHTER/LOOSER
TIMING:
-AT TDC, ROTOR CUTOUTS ARE AT 12 & 6 O’CLOCK
-SHEAR PIN IS INTACT AND AT 1 O’CLOCK
Anybody have any more ideas?
DISCONNECTED KILL SWITCH
CHECKED THROTTLE OPERATION
CHECKED CLUTCH LEVER OPERATION
FUEL FLOW FROM PETCOCK IS GOOD
BLACK & BLUE WIRES FROM COIL TO MAGNETO ARE SOLDERED AND SECURE
TIGHTENED ALL NUTS, BOLTS, SCREWS
REMOVED/CLEANED/REPLACED CARB, NO SIGN OF DIRT OR WATER
CHECKED AIR FILTER
SPARK FROM SPARK PLUG IS GOOD
NEW NGK SPARK PLUG
NEW PLUG WIRE
TRIED TO START WITHOUT MUFFLER
ADJUSTED CLUTCH ARM TIGHTER/LOOSER
TIMING:
-AT TDC, ROTOR CUTOUTS ARE AT 12 & 6 O’CLOCK
-SHEAR PIN IS INTACT AND AT 1 O’CLOCK
Anybody have any more ideas?
Or remove the spark plug and spray into the cylinder head.
If that don't work, then look at my first post and with a DMM, check the Ohm values of the CDI and magneto coil. The spark may be weak and may not be able to fire under compression.
Resolder the small unshielded wire on the coil magneto. Sometimes they look good, but might be a cold solder connection.
Make sure no wires are touching the frame.
If your getting gas and spark, you should be getting fire.
Good Luck,
Chris
AKA: BigBlue
sboricic123,
I've done that, too. LOL According to testing with an ohm meter, the magneto is bad. I've ordered a new one, should be here in a few days. I will let the group know if that fixes the no start problem or not.
I've done that, too. LOL According to testing with an ohm meter, the magneto is bad. I've ordered a new one, should be here in a few days. I will let the group know if that fixes the no start problem or not.
