OK so I think I have the answer to this but I'm gunna ask anyway and if I look like a d!ckhe@d so be it.......

Would it be fair to say, that if you changed a belt at home, and did the alignment that if you can ride at 100km/h without incedent then the belt is aligned just fine??

Thanks for the answers guys. Yeah I did the alignment by using proper non stretching cloth gaffer tape, with a nail at one end and a pencil at the other. (Saw this method used on youtube) Messuring from the centre of the swing arm pivot to the centre of the axle. 

Just didn't know if there was another way to check if it's correct. Belt tension was my next question.......

 

So how did you tension it Huddo?

You probably dont really need the gauge.

You could alternatively hang a (correct weight ) off the belt and measure the sag.
 

To be honest with you I went by my gut feeling with the little mechanical knowledge that I already have. I checked it by putting a metal rule at the belt were the top belt guard normally resides and pushed the belt up with my finger using fairly reasonable force and checked it against recommended specs. I also twisted the belt to see how much it would rotate. (Like old time mechanics did to check fan belt tension.) I could only turn it to about 45 deg. Maybe a bit less. I will invest in getting the proper tool though. Am I right in figuring that the belt should be re-tensioned after riding a few kms?

always check da tension with da rider sitting on da bike 

Shouldn't need to be re checked after a few klms. Thing is to get it right first time, which is why there is the special tensioning tool.

A reasonable harley type shop should be able to check the tension for not much coin if you don't want to buy the tool.

I won't be riding it until after it goes to the shop to get the frame horns modified and a rear guard sorted. I'll get the to check it all before i ride it home.

Thanks for the advice guys.

I changed out my rear tyre and just took photos of the tensioning bolts positions, then when I put it all back together I put the bolts back to the same position then felt the belt to make sure it felt right, took it for a test ride to make sure it tracked true and bobs your uncle, Port Augusta to Sydney straight after it.

Most accurate way to align the drive belt is by using a laser alignment device and aligning the rear pulley with the drive pulley.

Simple as holding the device onto the flat of the rear pulley and projecting the laser down the length of the belt.
Usually have to remove or swing the belt guard out of the way.

after rear is aligned then set the belt tension.

I use a coat hanger rod with a bend in one end and a snap tie on the other end to slide into position. One end on the center of the swing arm bolt and the other at the rear axle. change and adjust as required.

And if you reckon all mechanics at the dealers test the belt tension when they put the wheel back on, you are kidding yourself. That said, I have done all mine at home without a tensioner. Read the manual - you will be fine!