Worth checking squish?

[Irongamer727]

Allright, I'm about to install a new cylinder kit. Should I pay any attention to the squish?
It's the 170 kit

[Calum]

Has it got measurements for what the squish should be.

[Jens Eskildsen]

Keep us updated with how you like it

[Irongamer727]

@calum nope, no squish is mentioned. No squish "plates" are included either. So I guess you shouldn't need to check it. But I want to be sure.

[Irongamer727]

@jens-eskildsen sure!

[Calum]

@irongamer727 Yeah, but you got no measurements to go by...

[Irongamer727]

@calum thats true. But that does not confirm that the squish is correct. Whould be quite angry with myself if the piston smashed the head after the first start.

[Calum]

@irongamer727 Well, that's not measuring the squish, that's just assembling an engine correct.

Squish band tolerance is about the "squish" effect on the combustuable mix. Not whether or not the piston hits the head. As said, if that's the case, then you find find out upon installing.

A general rule of thumb when assembling engines is, it shouldn't be tight, you should be able to turn it over by hand. And indeed you should turn it over by hand before starting it up. Thus ensuring it's not tight and that the piston doesn't hit the head.

[DTR+NSR]

You normally check the squish by feeding a small length of solder down the spark plug hole, so the edge of the solder touches the edge of the bore. Then turning the engine over by hand then measuring the squashed end of the solder with a micrometer or similar. The squish on my dtr was 0.6mm when I bought it, which seems to be on the tight side.