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two colour spark plug?? anyone have that before?
Posted: Wed Aug 26, 2015 1:46 am
by Davidsquaredson
Hi,
dialing in my carb. Scooter is running very well, if anything, I can tell its slightly rich in the needle, I could probably move it one clip position. I took at a look at the plug. The colour is almost split down the middle, milky tea on one side, black on the other.
I've never had that before on a scooter. Any ideas?
Re: two colour spark plug?? anyone have that before?
Posted: Wed Aug 26, 2015 7:35 am
by Morgan
blown head gasket ?
Re: two colour spark plug?? anyone have that before?
Posted: Wed Aug 26, 2015 11:17 am
by Donnie
Is it an ally barrel ? ie mugello/ imola etc?
Re: two colour spark plug?? anyone have that before?
Posted: Wed Aug 26, 2015 1:09 pm
by Davidsquaredson
800 km on a new gt200 iron cylinder and porcupine head. Head gasket is metal 0.5mm. I will go have a look for signs of fuel being blown out.
Re: two colour spark plug?? anyone have that before?
Posted: Wed Aug 26, 2015 1:22 pm
by coaster
Davidsquaredson wrote:800 km on a new gt200 iron cylinder and porcupine head. Head gasket is metal 0.5mm. I will go have a look for signs of fuel being blown out.
Doesn't the GT head have a blank plug in the centre position? is it tight?
Re: two colour spark plug?? anyone have that before?
Posted: Wed Aug 26, 2015 6:05 pm
by watto66
I had a similar problem on a GT 186 kit with the centre plug not being tightened ( I assumed it was tight when I bought it ! )
Check that and as stated the gasket you have to loctite that central plug in .
Cheers
Re: two colour spark plug?? anyone have that before?
Posted: Sat Aug 29, 2015 6:41 pm
by Davidsquaredson
watto66 wrote:I had a similar problem on a GT 186 kit with the centre plug not being tightened ( I assumed it was tight when I bought it ! )
Check that and as stated the gasket you have to loctite that central plug in .
Cheers
Correct in 1. Just took cowl off. I could almost unscrew the plug with my fingers. Will tocktite it in. What torque did you use? Because there is no gasket, 20 Nm? Also, I had a ring type heat sensor pick up around the base. Is this a problem, does it make it easier to not get a good seal?
THanks
David