Honda SGX SKY Starting Problem

Hi .
Need some help because the Motor gets full of Petrol When it stands 1 day.
I,m repairing the Scooter for a freind.

Found out that the Vacuum cock not worket right, didn,t shut of .
Changed Batteri also defect, and Spark plug old
Took the Carburator apart and cleaned it.
Checked Fuel Valve , which gona shut of when the Carburator is full.
Took of the Inlet Manifold and changed the Reed Blade, old one was okey.
Checked the Automatic Choke funktion , It moves down after some time .

When I Had removed the Reed Valve I found out that the motor Sump was filled up
with Gasoline. ?

Got all things together again and the Scooter Started with no Problem
2 day,s after that i wont start again

Moped

 

Did you change the vacuum petcock?

 

Also see here:
https://www.scootershack.co.uk/threads/sorting-starting-problems-on-peugeots-and-yamahas.34074/

 

I changed the Vacuum Petcock

 

Ok.
Try what I suggested in the other thread there.

 

Have read the LInk, but the problem is that ignition is okey but the
Spark Plug is full of Gasoline, and the Engine is drowned.
I Just went out to the scooter 1 hour ago hmmmm
It Started at Once.
I didnt smell Gasoline in the Room like 2 days ago

I Normally drive and Repair Oldtimer mopeds from the 60,s

 

It does sound like the float is sticking.
Maybe change the float needle?

 

Going to tjeck the float and needle again tomorrow
Thanks for answers

 

Did you change the petcock for a brand new one though, or a used one?

 

A brand new was mounted, but today the new one didn,t close too.
Tried to put some thin oil spray in the vacuum tube and used som air too,
but the function is not Stable.
Took a look at the Dellorto PVHA 12mm again, the needle and Floot was okey.
But even if the Vacuum Petcock not is closing right , I think the Carburator
should close when its filled up

moped

 

Have you mixed up the 2 pipes maybe?

 

No , when i suck in the vacuum tube ( the one undernear ) the petrol cock open the other tube ( Gasoline goes to Carburator )
but it is not closing after some seconds,

 

That's a problem with scooter carbs, they cannot be relied on to shut the fuel off completely with just the float needle, hence the need for a vacuum fuel tap. You could try installing a manual fuel tap in the line.

 

Yes I think thats a good Idea , today it didn, t close total again.

 

View attachment 14809 Hi all
Change the Vacuum Fuel cock with another type and mounted an ekstern fuel cock in line of that
also changed the needle valve and float.
Gonna test that in some days.
Yesterday it had start problems again , hmm now the new Spark Plug had fail spark from the isolation ,
Took the decision and put in an oldtimer spark plug .

I don,t have time anymore because the oldtimers are waiting for me
but will return

 

The bike won't run good without an airbox.

 

Hi
Picture just shows where an normal Fuel cock can be mounted on a Honda Sky

 

Ah ok. You took it off to work on it.

 

No The vacuum petrol cock is still mounted and an normal close open cock is mounted after that.
Then you can shut of all Petrol, in case of the vacuum not shutting correct.

 

I think you got lost in translation here.
The carburettor needs an air filter. The engine will run very badly without an air filter.