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Yamaha MX & Off-Road Dirt Bikes
Valve guide Q's
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[QUOTE="Ol'89r, post: 1262385, member: 17212"] +1. Diesel. Although that is not what I use for grinding seats, I have used those in the past. Like Rich said, they require a very light touch and you may want to practise on an old head first. The problem with them is when they dig in and start to chatter. Once the cutter 'digs in' it leaves a line across the seat it is almost impossible to get the chatter out without cutting the seat way down. A little tip to keep them from chattering is to place a peice of paper between the cutter blades and the seat and cut through the paper. Don't know why the paper works, just know it does help. That, along with a very light and consistant touch will produce a nice seat. IMO, the problem with many of the new heads is the OEM's are trying to make them too light. There is not enough material around the seats to hold them in place with the constant pounding of the valves along with the heat cycles. This has made them disposable. The KXF heads are the worst in this respect. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Valve guide Q's
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