hi i have classic yamaha 100cc dirt trail bike wanting to do it up original colour yellow just wondering if anyone knows what sort and year model it is the vin number is 497000353 if someone can help me out it would be much appreciated 

I think it's a 1974 AG100 Matt

https://www.google.co.uk/search?q=1974+yamaha+ag100&tbm=isch&imgil=8glOtlXlLo7G1M%3A%3BDkYvbKOzkv4RZM%3Bhttp%253A%252F%252Fwww.off-road.com%252Fdirtbike%252Fvoice%252Fdont-ask-you-dirt-bike-questions-answered-53180.html&source=iu&pf=m&fir=8glOtlXlLo7G1M%3A%2CDkYvbKOzkv4RZM%2C_&usg=__88pI96Zg-i6D7IZ8BOS2maUCAVg%3D&biw=1280&bih=899&ved=0ahUKEwibqO_r4LbVAhUFLFAKHUHTDhwQyjcILQ&ei=stSAWZuHC4XYwALBprvgAQ#imgrc=8glOtlXlLo7G1M:&spf=1501615400146

thanks mate i think that's the one closest so far your a legend