Plug check

Farmingstock · Trackday Trickster Joined: 17 Jun 2016 Karma :

Does this plug look ok?

Trying to sort out the fueling on a 50cc, it starts on the button sometimes and runs fine but then occasionally it won’t start at all on the button the barely runs at all when I bump it and once it does start I have to wind the throttle totally back and hold it there or it’ll die, then eventually it will Rev up.

It’s getting fuel as I’ve tried to undo the overflow on the carb and it leaks out of that.

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

Yep, looks fine.
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Sprint ST 1050

Farmingstock · Trackday Trickster Joined: 17 Jun 2016 Karma :

Any suggestions as to why it has the running issue?

Almost like it’s getting either too much are or too much fuel?

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

What bike?

Fueling can't change that dramatically if it starts fine sometimes and not others. what sort of fuel tap does it have?

Does it start fine when cold or hot?

Do you mean overflow or drain screw? Fuel shouldn't be coming out of an overflow.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

Farmingstock · Trackday Trickster Joined: 17 Jun 2016 Karma :

It’s a Rieju with the AM6 50 engine.

Does it hot and cold, has a vacuum fed tap, a new one, comes out of the drain when I undo the tap.

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

Farmingstock · Trackday Trickster Joined: 17 Jun 2016 Karma :

The drain on the bottom of the carb, you unscrew it and fuel comes out! Most carbs have them!!

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

Is the vacuum pipe in good condition and a good seal at each end?
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

Farmingstock · Trackday Trickster Joined: 17 Jun 2016 Karma :

The vacuum petcock is new and yes they are tight, the reason I mentioned the tap was because I checked that when it wouldn’t start to see if there was fuel in there to try and cross that off.

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

Does the tap have a 'prime' position?
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

Farmingstock · Trackday Trickster Joined: 17 Jun 2016 Karma :

No, nothing on the petcock and nothing on the carb.

Farmingstock · Trackday Trickster Joined: 17 Jun 2016 Karma :

The bike has the issue all the time now, it struggles to start but does start with no throttle, as soon as I touch the throttle to give it any revs it will die, also the mixture screw and idle screw do nothing!

Looking like a carb issue.

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

jaffa90 · World Chat Champion Joined: 06 Apr 2016 Karma :

Hi again, "" but does start with no throttle""
That tells me the pilot jet is letting fuel through with part opening of the butterfly flap / carb slide / piston. Opening it more (more throttle) should pick up more fuel from the main jet.
I suggest that the carb should be serviced and an inline fuel filter fitted to see what is going on.

Farmingstock · Trackday Trickster Joined: 17 Jun 2016 Karma :

Made a quick video to hopefully explain, this is warm, choke does nothing either way. Won’t start when on throttle!

Kawasaki Jimbo · World Chat Champion Joined: 09 Oct 2015 Karma :

Farmingstock · Trackday Trickster Joined: 17 Jun 2016 Karma :

I’ve sprayed brake clean around the carb and no change in revs

jaffa90 · World Chat Champion Joined: 06 Apr 2016 Karma :

mentalboy · World Chat Champion Joined: 05 May 2012 Karma :

Has this started happening since the start of winter? Sounds to me like it could be condensation collecting in the float bowl.
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Farmingstock · Trackday Trickster Joined: 17 Jun 2016 Karma :

Still no joy today

Tried some fresh fuel in a separate tank - no joy
Tried a new plug -no joy
Tried spraying pre-mix around carb with throttle open - no joy
Checked all the jets - all clear
Tried without filter - no joy
Tried blocking air filter intake - no joy

I have taken the carb off again, to check gallery’s and all clear, the float has no adjustment as it’s made of plastic.

As can be seen in the video, it’s from tickover to anything above, could it be anything to do with the reeds or needle height? I haven’t touched either as yet but I’m struggling here

jaffa90 · World Chat Champion Joined: 06 Apr 2016 Karma :

"""Tried spraying pre-mix around carb with throttle open - no joy"""

I hope you mean IN THE CARB?

Farmingstock · Trackday Trickster Joined: 17 Jun 2016 Karma :

Farmingstock · Trackday Trickster Joined: 17 Jun 2016 Karma :

Put the carb back together and no change! Tried spraying fuel in the carb, no change, seems to be getting plenty of fuel!

Farmingstock · Trackday Trickster Joined: 17 Jun 2016 Karma :

Just took the silencer off and it now revs up! It lingers low down it the revs around 3000 revs, then drops down to 2000 revs after around 30 seconds but with the silencer removed it actually revs up, it feels very lazy low in the revs and not responsive at all, but high in the revs it pulls ok.

Could it be over fuelling?