Why is my compression so low

[rhuebner]

higher you go, comprsssion lowers

Yeah I have 20cc, I think i'm going to go with 18cc.

Does your compression get higher or lower the closer you get to sea level?

[Snopczynski]

It gets higher.

[dajogejr]

Squish is the gap beween the dome and the crown of the piston...and quite easy to measure, acutally.

You need solder and a micrometer...

 

You put solder in the spark plug hole, make sure it is running parrallel to the the crank (if you do it in front or back side of the piston, it will be a false reading since the piston rocks back and forth in the cylinder) and crank the bike over by hand with the kickstarter.

 

Measure how thick the "Smooshed" solder is.

 

Everyone has their preferences....I like to run .045 to .050.

 

Some will say lower....

 

That PSI sounds roughly 15 to 25 PSI low to me, even at 3600 feet.

[rhuebner]

Squish is the gap beween the dome and the crown of the piston...and quite easy to measure, acutally.

You need solder and a micrometer...

 

You put solder in the spark plug hole, make sure it is running parrallel to the the crank (if you do it in front or back side of the piston, it will be a false reading since the piston rocks back and forth in the cylinder) and crank the bike over by hand with the kickstarter.

 

Measure how thick the "Smooshed" solder is.

 

Everyone has their preferences....I like to run .045 to .050.

 

Some will say lower....

 

That PSI sounds roughly 15 to 25 PSI low to me, even at 3600 feet.

Thanks for the info man.

Also my reading was on a cold motor, i'll get my shearers on and run it awile and then do another reading.