I took down the top end of my 1998 KDX220 to replace piston and rings. I noticed that at bottom dead center, the piston crown has a step up above the exaust and transfer ports, when measured, of about 1.2mm.
A friend has suggested that I should make a spacer gasket out of alluminum and use two paper bottom gaskets on either side to raise the block so that the piston crown becomes level with the ports. Then measure the top dead centre squish using solder or plastercene to see how much of the top of the block needs to be shaved to bring the compression within normal tolerances.
He also suggested using the botton gasket to determine whether the casings need to be properly matched to the block. There seems to be a little that could be trimmed to match.
Has anyone done anything like this to their bikes? I have been told it should make by bike burn fuel more effieciently and reduce the overheating I experience under harsh riding conditions, plus an overall improvement of performance by 5-10%.
A friend has suggested that I should make a spacer gasket out of alluminum and use two paper bottom gaskets on either side to raise the block so that the piston crown becomes level with the ports. Then measure the top dead centre squish using solder or plastercene to see how much of the top of the block needs to be shaved to bring the compression within normal tolerances.
He also suggested using the botton gasket to determine whether the casings need to be properly matched to the block. There seems to be a little that could be trimmed to match.
Has anyone done anything like this to their bikes? I have been told it should make by bike burn fuel more effieciently and reduce the overheating I experience under harsh riding conditions, plus an overall improvement of performance by 5-10%.