Oh no! wont start!!!

[zakmllr]

Hi guys and gals! New to the forum, so not sure if I'm posting this in the right place. I've just finished building my first bicycle engine kit and I really appreciate the help from previous threads I've read on here before joining. It really gave me a good sense of accomplishment finishing this build, that is, until I filled it up and tried starting it for the first time, and then... NOTHING! I followed the install instructions perfectly so I'm unsure what it may be, i double checked everything but i did and the jaguar CDI to the build, I wired it exactly as instructed. The first time riding it I had to break the clutch in because it was stuck from shipping so it pedals fine now,and when i drop the clutch it doesn't even sputter, or chug, or whatever you specifically call the noise from one of these. I have an expansion chamber exhaust on it as well but i can't see how that could affect the start at all. So I'm wondering if this could be a problem with the carb maybe? The needle has 5 slots and the clip is on the middle one. Any suggestions?

 

[MotorBicycleRacing]

i double checked everything but i did and the jaguar CDI to the build, I wired it exactly as instructed. Any suggestions?

Welcome,Yes, did you check for spark at the plug?

Put the stock CDI back on and try that.

 

[zakmllr]

Oh yes, there's a spark, i just checked it by accidentally shocking myself by holding the spark plug in my hand and spinning the pedals.

 

[MotorBicycleRacing]

Spark at the right time, gas and compression will make any motor run.
Is your plug wet from gas?
You don't say what carb or kit that you have?

Having the clip in the middle will not make any difference to starting.

 

[Legwon]

from what im reading, it sounds like the clutch is too loose.
can u pedal it, when u drop the clutch?? or does it just skid to a stop??

 

[zakmllr]

When I drop the clutch I can still pedal but it's harder

 

[ocho ninja]

Does it just feel like more drag or can you actually hear the motor turning over ?

 

[Legwon]

http://motorbicycling.com/showthread.php?t=22726

http://motorbicycling.com/showthread.php?t=8392

 

[zakmllr]

It feels like more drag bug when I remove the head and push the pedals I can see the piston movement

 

[zakmllr]

But the bike is lifted at that point

 

[crassius]

without compression it will most always turn the engine easily - you need to see if the engine is turning with compression or if the clutch is just slipping - try taking the 4 screws out of the magneto cover and watching the rotor to see if it turns

 

[2door]

It feels like more drag bug when I remove the head and push the pedals I can see the piston movement

Don't do this. With the cylinder head removed there is nothing to hold the cylinder in place but a stuck gasket. If you pedal the bike with the head removed the cylinder could come off of the case and you could do some serious damage to the piston, cylinder walls and other stuff.

Tom

 

[Legwon]

Don't do this. With the cylinder head removed there is nothing to hold the cylinder in place but a stuck gasket. If you pedal the bike with the head removed the cylinder could come off of the case and you could do some serious damage to the piston, cylinder walls and other stuff.

Tom

2door is right. to check that the engine is turning over do as crassias suggested or remove the clutch cover and Look for the large gears moving

 

[2door]

2door is right. to check that the engine is turning over do as crassias suggested or remove the clutch cover and Look for the large gears moving

Or just remove the spark plug and look down the hole.

Tom

 

[zakmllr]

after i adjusted the clutch it now sounds like the flower nut is scraping against the cover

 

[zakmllr]

the bike runs just fine now but i still hear a scraping beneath the cover like the flower nut is rubbing on it.

 

[zakmllr]

Thanks for the help guys! the bike's running like a champ. Does anyone else have a problem with the scraping?

 

[mew905]

I did, but not the flower nut, I had a problem with the other screw coming loose (the one keeping the small gear on) and punching its way right through the clutch cover. as long as the nut is tight and held there with the little screw between the "petals", you should be fine, though I've never heard of flower nut scraping.

 

[crassius]

look inside the clutch cover for marks - then search here for clutch problems

 

[wan37]

This link might answer it

http://motorbicycling.com/showthread.php?t=45746

 

[zakmllr]

It is the flower nut. Searched for it like you asked and there's really not too much on it surprisingly. One fellow said he noticed it happening to one of his engines and the flower nut eventually just cut out a space in the cover and it wasn't scraping anymore. I really don't feel like waiting for that to happen.