Pound Through JIS Screwdriver Set Workshop Tools Yamaha claim in their manuals

Yamaha claim in their manuals that they can't be taken out and death will be the reward for those who try :)

Setting the fluid level in front forks accurately is critical to the safe handling of your bike and this tool makes it a piece of cake

Using cheap 'easy outs' are a very bad idea indeed and the name is an oxymoron

For correct

Pound Through JIS Screwdriver Set Workshop Tools Yamaha claim in their manualsIf you've got a tight JIS screw, insert one of these screwdrivers into the head and give the top of the screwdriver a good sharp tap with a hammer and you'll find that you should be able to undo it. If it still refuses to budge, then soak it in AC50 for a while. If it's still difficult, then warm the aluminium up initially with a heat gun. Give the pound through screwdriver another good tap and turn it. If it's still tight then you'll need more heat.