Gv125 aquila 2007 firing on one cylinder when cold

[Joshua O’Shaughnessy]

Hi guys yet another issue with the gv125 2007. When the engine is cold I only get one cylinder firing. The other does kick in after 5 minutes of crawling in 1st. Any ideas what it could be?

[♠️ M77]

Hey,
Try this and tell us if we got anywhere close?

Before you start it….
Take both HT caps out and both plugs out.

Now
If you put the plug inside HT Cap => Then plug on engine cylinder heat bolt (unpainted area) =  Press start.

A.  Which cylinder sparks the most? (brightest)

B.  Swap the coils around ==> Do above again => which cylinder/coil sparks the most?

As an extra….

Come back if you can with this:
C.  Take pictures of the spark plug  => sideways (see if threads are burnt ,   top-down to see the middle of the plug and tell us if it is a normal CR8E or some other plug ?

Tell us which plug is front and which is rear.

 

I know it is electrical  ,  likely HT Caps  (common = we switch to Rubber NGKS , but don’t buy plastic ones as our twins are hot and shake a lot (vtwin rumble) )   and  ignition coils themselves  (also common)

Also if you have a can of Contact Cleaner (halfords)  and ACF50
– Find every plug on the bike ==> Clean contacts until they go gold ish.  = Better signals.
– Every plug that’s cleaned ==> Apply a “tear drop” of ACF50 inside them ==> fights rust or oxidization for you   as they cause weak signals or bad signals in general.

 

 

 

If you are handy with a meter , we can probably test ur caps and your coils right there  if they have been upgraded already ?   and see if its something to do with the carb or fuel system (pump/tap) doing a slow fuel delivery = but does it ride perfectly in general once hot ?

Lots of questions but lots of answers from you might help us narrow it down for you .

[Author]

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