they are round headsnowdad4 said:are those the hex ones?
if so, depending on what size your after, any western power sports or parts unlimited dealer can get those, in the popular sizes as well as your oem yamaha parts dealer in the odd increments, they are mikuni 4/042 type jets.
lots of different vehicles used those style carbs, i even have a few unneeded ones left over from those days, can check sizes if your interested.
yamahas typically drop one jet size for every 20*F. remember though that yamaha mains are incremented differently by size vs aftermarket ones and you pay for those odd sizes.coryv4 said:lets say the sled is running rich at 20F how many mains should i drop for 70F 4 sizes?