measuring squish?

[thejackrabbit]

when people refer to what their squish band reads are they measuring the thickness of the solder at its thinnest point or at it's thickest?

[jostby]

Thinnest point.
When I had RBD do mine seems He asked that I use a 2" piece hollow core solder directly across the top of the piston under the hole for the spark plug. The result showed the untouched part where the plug would have been (leave it out to do this) and the tightest area is around the plug hole. The head is then machined accordingly to match the squish desired while keeping the same shape as the piston dome.

Kudos to RBD. He did a great job at a good price and turn-around was quick. Very noticeable results on my bike. We haven't done my kids bike.

[thejackrabbit]

My bike has a .5 base gasket (dark green in color) I measured the squish and it came to be 1.7 and 2.5mm on the larger end, the piston looked good so I plan on just replacing the rings.
The bike is really soft on the bottom, could be jetting, but compared to the ktm 200 it's lacking, the mid range and top are strong

[Jakobi]

http://www.twostrokeperformance.com.au/#!important-info

The outside edge is your minimum clearance, which is what most refer to when they say their squish. Depending on how the rest of the head is cut in relation to the piston dome it may stay the same clearance across the band, or may open up some more as it does stock. The main thing to remember when adjusting the squish is to take into account that any changes also effect the trapped volume and thus the compression.

[(F5)]

The 200 really likes increase of compression & decrease of squish. I closed mine up to 0.8, but I had to take some out of the bowl to reduce the compression that went too high. How high you can go depends ont he gas you will always run. Google how to measure trapped volume there should be heaps of info around. takes some time & careful tinkering but it is worth it.

Finally going to do my 300 tonight after a couple of years saying I will.

[Jakobi]

Nice one F5!

[hannesd]

Originally Posted by (F5)

The 200 really likes increase of compression & decrease of squish. I closed mine up to 0.8, but I had to take some out of the bowl to reduce the compression that went too high. How high you can go depends ont he gas you will always run. Google how to measure trapped volume there should be heaps of info around. takes some time & careful tinkering but it is worth it.

Finally going to do my 300 tonight after a couple of years saying I will.

0.8 for the 200?? that's real close...