plug colour advice.

[grandpa]

Hi Chaps,
Since fitting a stainless steel expansion exhaust to a standard indian gp150 i noticed the plug colour is slightly lighter.It is similar to the colour of an amazon cardboard box.Plug is NGK B7eS carb is standard jetex .I have a 122 main jet i could fit .If needed how do I make it run richer? Does anyone drill the atomiser to 2.0 mm as suggested by Scooty loopy john? on the old forum.
All ideas appreciated.
Thanks ,
Grandpa

[coaster]

It's difficult to tell from a photo but that doesn't look far off perfect to me

[CHRIS in MARGATE]

+1
It's difficult to accurately assess because cameras and software give varying results. Almost there. Try the 122 but I wouldn't personally drill the atomiser out.

[sunrisemac]

Looks pretty good from here

[grandpa]

Hi chaps,
Thanks for your reassuring comments.I shall leave well alone
Grandpa

[bazza3004]

I would be happy with that.

[Paulnobodyimportant]

Looks perfect to me as well.

[Toddy]

Agree nice Colour, was that just taken out after General Running or was it during Plug Chops ? as it may be good at one throttle position and Lean/Rich at others always worth checking when you change exhausts .

[grandpa]

Hi Bazza, paul and toddy,
Thanks for all your comments.
It was taken after going up a hill on full throttle and switching off.I will check again soon but before expansion exhaust it was more of a chocolate brown rather than the amazon box brown it is now
I also noticed it appears to have less torque at low revs but might be faster in fourth gear possibly because engine is revving a bit more (Indian gp150 with 5.65 final drive)
.....and it wont rust
Thanks all
Grandpa

[CHRIS in MARGATE]

Lack of torque is the expansion box out of the power band.You can't have it all.

[bazza3004]

I would do the same run at 1/4 1/2 and 3/4 throttle positions aswell to give you a better idea of how the rest of jets etc are doing there job. (Unless you ride everywhere flat out of course )