Hey guys, I've been steadily working on Mack's 640 getting back into running condition since it's been sitting for a year or more. I've found the problem with the dying motor. The floats were way off so that gas was flooding the engine everytime you hit the front brake or compressed the forks. If you held the carb level, the floats were no where near level with the lip of the carb. I did notice that the float tab contact point is very close to where the tab mounts to the plastic float. Is this correct? Here's a picture. The arrow on the right is where the needle contacts the tab. The arrow on the left is the end of the tab. Seems like it should be somewhere in the middle so you have more adjustability. Mack had bought a 8.9kg (had it measured) titanium rear shock spring, however, it was for the 950 or pds shock body. It's too wide and short to fit on the 640. Can someone recommend another spring? I checked Race Tech and they don't have or recommend an 8.9kg spring.