I need your help.
Firstly my bike's details:
Suzuki GN125, 2004 year, chinese version, 120,000 km done
Carburettor Mikuni: http://www.brooksbarn.co.uk/GN125-CARB-NOT-H-MODEL-SILVER-TOP-DIAPHRAGM-TYPE_ART61.aspx
Now the problem. Engine won't start from electric ignition when cold but it does start when pushed and it does start when engine is warm.
New battery, new spark plug, fuel is going to carburettor freely (checked fuel tap filter), there is a good spark (taken spark plug out and touched to engine and pushed the ignition, good spark)
So, there is a fuel going freely to carburettor and there is a spark.
I have cleaned the carb, but to be honest there was no rubbish in it.
There was some white stuff in the rubber hose which is going from air filter to carb, like soapy stuff.
Adjusted a fuel/air mixture as was told by friend that maybe there is too much fuel and not enough air- when cold and rainy outside (live in Scotland) maybe the air filter is getting wet and there is not enough air going to carb?
When trying to start the engine there is an explosion sometimes. Trying to start it with and without choke which is manual of course.
Another thing, the fact is that the engine starts sometimes even when cold, I just observed that there is a problem when is wet outside (keeping the bike outside)
The problem started recently, but as I said it sometimes starts, sometimes not. I use the bike everyday for going to work which is 8 miles one way. After 8 hours of work it starts most of the time, but after night it doesn't. Almost always it starts when pushed and from the 2nd gear.
By the way, I don't know if that's normal but when I start the engine on the choke and it starts the revs are around 4000rpm but sometimes after 30secs, sometimes after 2 minutes revs going down to 1000rpm-1500rpm - does it mean that engine adjusting the choke automatically when warm? Doesn't it suppose to have big revs when choke is fully open, even when engine is warm?
Now few possible reasons (in my opinion):
Wrong fuel/air mixture (even after adjusting it- half rotation on the mixture screw)
Wrong valve settings (gaps)
Blocked fuel stream from carb to engine (?)
Any ideas??? please email to madmadig @ gmail.com
Thanks in advance,