Gilera DNA 50cc not firing up - Coil? Ignition? Battery?

will108 · Derestricted Danger Joined: 08 May 2011 Karma :

Hi guys,
As per the title, my DNA is not firing up.
I do not think it is the battery as I connect a charger to it and it said full, and when I started the bike with it attached, it just kept kicking but did not fire.

Please have a look at a video I have uploaded of me starting it:
https://www.youtube.com/watch?v=Mv3_Ryftwbw

I have put in a brand new spark plug.
Thanks in advance.

Will.

P. · Red Rocket Joined: 14 Feb 2008 Karma :

Dead battery.

Its not even turning it over.

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

battery has totally had it, it say charged cos the battery won't take any charge fooling the charger into thinking its charged.

As above it doesn't even turn over, get a new battery mate

Nope. · World Chat Champion Joined: 16 Feb 2011 Karma :

1) Battery is dead.

2) Try kick starting it.
____________________
Former: Derbi GP1 50, Sachs XTC 125, Suzuki GSXR 400 GK73A, Kawasaki ZX7R, Suzuki DR250, Yamaha RD350
Current: 2011 Yamaha XT660Z Ténéré, 2003 Yamaha YZR-R1 5PW (In Build), 2009 Kawasaki ZZR1400

Itxi · Scooby Slapper Joined: 19 Sep 2011 Karma :

Can the battery be dead if the starter motor is still working? (I guess that's what you can hear, pretty sure it turned it over once.)

Have you looked at the spark plug(s)? Check that they still give a spark when you kick start it. If not it could be that you need to check the spark gap (not likely if it's worked before), or you may need a new plug.

If the new plug doesn't work my guess would be the ignition coil. You can test it with a multimeter or a bulb, best to look in the haynes manual for your bike to check how on that one.

I'm having the same problem with my bike, I can only guess it's the ignition coil right now since I've checked everything else. But at the same time this is my first bike so I'm not the best person to take advice from.

Nope. · World Chat Champion Joined: 16 Feb 2011 Karma :

Ok, were back to trouble shooting small capacity two strokes again!

There are several things that every 2 stroke engine needs to run (Ill stick to two strokes as its on topic).

It needs the following:

Air, Fuel, 2 Stroke Oil, Spark, Compression.

(Well, it might run without 2 stroke oil, but it'll seize quickly!)

So, to troubleshoot a Two stroke engine you need to check all these things.

Start with the basics that anybody can do at home.

CHECK THAT THE KILL SWITCH ISNT ON!

Start by checking that fuel is getting to the carb. Check that the fuel tap is on, that the fuel line isn't blocked/kinked, that you have petrol in the tank.

Then check that you have two stroke oil in the tank, that the line isn't blocked and that its still connected to the carb and/or crank case.

Then check the air filter. Check that it hasn't fallen out, make sure that its clean, make sure nothings blocked up and make sure the air box is still connected to the carb.

Check that you have a spark. Unplug the HT lead, take out the spark plug and re-attach the HT lead. Place the side of it against a head bolt or something. Hold it there with a pair of insulated pliers then kick the engine over. If there is a spark then you know that its sparking. Pop the plug back into the engine. If there is no spark then you need to check the HT lead, the Coil, the CDI/Points and condenser and associated parts.

If all thats ok then you need to look at compression. You'll need to get yourself a compression tester and find out what the compression should be for your engine. Check the compression and if its far below what it should be then your engine is due a rebuild. If thats ok and its still not running then you need to check a few other things.

Take off the exhaust and make sure that theres no nasty bits in there. De-coke the exhaust (It wont necessarily help your starting issues, but it cant hurt while its off). (The following bit is stolen from Pete)

P. · Red Rocket Joined: 14 Feb 2008 Karma :

will108 · Derestricted Danger Joined: 08 May 2011 Karma :

Wow, thanks for the responses guys.
I have ordered a new battery for £25, will get in Sunday and let you know.

Thanks again.
Will.

PS. I have broken the inside of the kick start, I need a new case.

will108 · Derestricted Danger Joined: 08 May 2011 Karma :

Hi,

Checks made:
Getting good spark.
Enough compression in top end.
Carb Getting petrol.
No oil coming through.

So:
Oil pump not working, added oil in tank.
Cleaned carb.
New plug.
Cleaned choke.
New battery.

Done.
Works.
Crazy.

Thanks.
Will.

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

you really need to get that pump sorted, are you checking it correctly?

Nope. · World Chat Champion Joined: 16 Feb 2011 Karma :