Poor starting moped

[Farmingstock]

Took the carb off again and drained the fuel out that was in the bowl then poured it back into the bowl put a clear pipe on the over flow and the fuel level was level with the top of the bowl! The car is as clean as the last time I cleaned it, all jets clear, all passages clear, no issues as far as I can see!

Put back together and the bike is exactly the same!

Takes 18-20 seconds of turning over to start!

[jaffa90]

Ok, can you remember the condition / colour of the spark plug upon removal?

When it starts is there a few puffs of dark smoke?

Does it have a high flow air filter fitted?

Have you tried a temporary home made denser / low flow air filter (blow through them)?

[Farmingstock]

[jaffa90]

If possible remove the plug after trying to start it without starting to see if the plug is wet with fuel.
Also try easy start spray with fine tube (i use GT85) and spray into carb inlet as far as possible ON FULL THROTTLE then remove and try starting engine also on full throttle and NO choke.
Surely it should cough ?

[Farmingstock]

Managed to finally get the plug out, I know know why they made it so difficult, the plug was dry a little black on the edge but dark brown in the Center, I did try the plug out of the engine it wasn’t sparking, I put a jumper pack on and it started sparking fine, put it back together and it still wouldn’t start properly, maybe a little better with a jump pack but more like 15 seconds instead of 20 seconds, not tried carb spray in the intake yet, will wait until it cools down again!

[jaffa90]

"""""I did try the plug out of the engine it wasn’t sparking,""""
Why was that? Is the spark better on the kick start ?

[Farmingstock]

[jaffa90]

See how you get on with the spray method.

[Farmingstock]

[jaffa90]

I`ve tried carb cleaner and it evaporates too quickly, as said i use gt45 on all engines ( more so 2 strokes) because it has a lubricant and runs a little bit longer .

[Farmingstock]

[Easy-X]

Using the spray, does it cough like it's trying to start but just won't keep going?
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Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[Farmingstock]

[Easy-X]

Hmm... I would guess some sort of spark issue. Down on compression or bad timing would at least get a cough out of it.
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Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[Farmingstock]

[Farmingstock]

It’s something to do with the spark! Don’t know what’s but it doesn’t spark at all then it does, maybe a loose cdi connection inside the cdi/coil, will get another one of them and see if the issue persists

[Farmingstock]

Looks like it was the CDI after all that, thank you everyone for the help and advice, much appreciated

[jeffyjeff]

Alls well that ends well. What was the cause of the problem? Was it a failed ignition module, sensor air gap, or something else?
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History shows again and again how nature points out the folly of men - BOC

[Farmingstock]