Riding in winter
Helmet
If the visor mists up, you need an anti fog / mist insert from your motorcycle shop.
Better still get a helmet which is supplied with an anti fog / mist coating (coating is better than an insert, vision wise).
If you need more warmth in the helmet, buy a helmet thermal balaclava.
Hands
Wear winter motorcycle gloves that are big enough to wear thermal under gloves inside,
you could also try over gloves to try to stop the wind chill.
But the best way to stop the wind chill getting to your hands in the first place,
are motorcycle handle bar muffs, or you could put plastic hand protectors for off road bikes on to the handle bars,
do anything to get a thick amount of insulation between the wind and your hands, even air is an insulator.
Of course the more layers of protection you have, the warmer you will be.
Heated grips need power from the engine,
the Honda CG125 is a small engine and may struggle to cope with the electrical demands (battery may struggle to recharge).
Boots
Buy a thick insulated pair and make them one size to big for your feet.
Put two pairs of thick thermal socks on so the boot fits,
the next trick is to stop the cold wind getting through the boots, over boots (waterproofs).
Trousers
Wear thin thermal trousers, then put a pair of normal thick jeans over the top,
the jeans will need to be one size larger than you normally wear due to the thermal trousers underneath.
You can also put waterproofs over the top to reduce the wind chill.
Coat
Leather is still the warmest on a motorbike. The only trick is to stop the cold wind getting through the main zip.
You could put a large map or bubble wrap inside the coat, if nothing will fit, put waterproofs over the top of the coat.
Silencer / Exhaust
Do not put oil or grease on the silencer, it will burn off and leave a stain. In winter you must keep cleaning it.
The silencer constantly likes to rust, even in summer.
Clean the rust off with Autosol (car shops, it's metal polish that claims not to scratch, the toothpaste tube type version is best, not the liquid bottle version).
If Autosol does not get all the rust off, try again with more Autosol but rub more and harder, keep doing this over and over until its all gone.
There is one thing you can put on the silencer. I recommend Mer Car polish, its normally sold in most shops for waxing car paint.
But it can also be used on chrome or stainless steal silencers and can stand the heat when the bike is used.
I put 2 coats on, its improved the rusting problem, there is no sign of the polish,
the silencer is just protected more and shining as much or better than before.
When the polish eventually wears off the silencer, it will no longer be smooth to touch, simply put another coat or two of Mer Car polish on again.
If you notice the silencer rusting in a few places its because the polish has worn off totally, use Autosol (see above) to remove rust and put Mer Car polish back on.
Autosol will also remove Mer Car polish, so you must put Mer Car polish back on again.
If you are confused about how both Autosol and Mer Car polish both claim to be metal polish and protect afterwards, I have found,
Autosol removes rust very well but is useless at protecting metal from rusting afterwards,
Mer Car polish is useless at removing rust but is very good at protecting metal from rusting.
Rest of the Bike
Clean the bike before the salt is put on the roads, and before it's to cold for your fingers to work on the bike.
When the bikes clean, you need to protect it from the salt on the roads.
You need some form of grease to stick to the cold exposed (not painted) metal parts.
You could use Vaseline or motor bearing grease (car shops) or anything really.
Smear it on the wheel rims and the spokes, the spokes are the most difficult and important since they are not chromed.
Put the grease on the chrome forks, but not the part that goes up and down the rubber suspension part (you must clean that part all the time in winter).
Grease the chrome Honda badge on the forks and the chrome headlight ring.
Grease the back brake pedal (not the part your foot touches), gear shift, handle bars and all the nuts and bolts you can find on the bike.
Grease the outside bottom part of the rear suspension (chrome part).
The chrome inside the rear suspension can be treated with engine oil, using a cotton bud or anything to reach inside
(again do not treat the bit that goes up and down the rubber suspension seal, you do not need to clean it since its protected by the front of the bike).
You do not want the grease and oil on the bike in spring or summer, the insects will stick to it.