Below: the small decal/sticker which is supposed to go on the YEIS-device, a.k.a. the "Boost bottle", which gives the motor more power in low revs. YEIS=YAMAHA Energy Induction System. The sticker is not a comletely true copy of the original. The difference is that the copy is made up of 2-3 planes, each itīs own color. But in every other respect it is a very good copy.
edit: since the inception of this webpage, a few services have appeared offering full line of IT stickers and also lots of other YAMAHA stickers.

YEIS device without sticker.

The sticker I had made, the original below, the copy above (top). YEIS with sticker attached.

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Among the next projects is making the warning sticker for the rear fender. i will probably have it made in the same manner as the YEIS-sticker if no other method is available. I am still trying to figure out the right look of the warning sticker for the 1981, I think it differs in colour and shape to the one in the pic. below, though the text is probably the same.

"WARNING - THIS VEHICLE IS EQUIPPED FOR COMPETITION USE ONLY. IT MAY BE ILLEGAL TO USE THIS VEHICLE FOR OFF ROAD USE WHILE IT IS EQUIPPED FOR COMPETITION USE. CHECK THE REQUIREMENTS OF YOUR STATE AND RIDING AREA.

THIS VEHICLE IS NOT EQUIPPED FOR REGISTRATION ON PUBLIC STREETS AND HIGHWAYS.
MFD.XX/XX YAMAHA MOTOR CO. LTD"

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The silencer assembly for IT250 H,J,K,L and IT465 H, J and IT490 K and L types. The inner baffle (below on the pics) reaches 20.5 centimetres into the assembly.

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Below,printable decals. These need a white background, works good for white plastic but for blue plastic the decals must have white paper or white paint on the backside if printed on transparent material, regular paper or white decal paper will work good.

IT and 465 decals