Compression Test

[Shaka]

Thanks for that shaka, @ $21 it is not a lot to lose if it does turn out to be cheap and nasty in the long run. The valve adjuster tool for my GPX was going to cost $93, needless to say I made do with my conventional tools.

For that price you could buy 12 before you equal the price of the Snap-on!  I wonder if the Snap-on is really 12X better?

[sidthesloth]

They probably are better quality but for home use it would be hard to justify the price.

[sidthesloth]

Hey shaka, what is the compression spec.? I could only find 11.5kg/cm. Any idea what this is in psi?

[axy]

Hey shaka, what is the compression spec.? I could only find 11.5kg/cm. Any idea what this is in psi?

Install this, it can pretty much convert from anything to anything.

http://www.brothersoft.com/master-converter-5857.html

[Shaka]

11.5kg/cm is 165.5psi. I use onlineconversion.com.  165psi sounds pretty high!  Is that your new cylinder?  I've always just heard anything over 100psi is in the good range.

[sidthesloth]

No, the manual says 11.5 kg/cm for compression. If so my original cyl. was kinda low @ 7.4.

[Shaka]

Interesting!  I see where the manual specifies the 11.5 kg/cm.  When I do the conversion the only option is kg/cm².  I'm pretty sure that is what the manual means, but that still seems really high.  I've never heard of a scooter running 165 psi of compression.  I've seen 140 psi, but that requires very high octane fuel to prevent detonation.  Possible mis-print?  Idk?  What I do know is anything below 100 psi and the fuel doesn't combust properly, so that's where the cut-off really is!  However, the higher the compression, the more power you can get out of it!

[sidthesloth]

Yeah, I figure with mine so close to the 100 would possibly explain the reluctance to start some times, though when running was fine.

[zombie]

I ran a diff. converter, and came up, the same. I looked at an old zx (pre super fever) manual, and they also had 11.5. My Malossi tests at 120 new. Ihave seen polinni kits go to 190, but they are pure race on 110 0ctane only. That 160 bothers me.