KymcoForum.com

Scooters - 50cc => Super 9 => Topic started by: yogi on September 21, 2009, 06:48:36 PM

Title: Low compresion Super9s
Post by: yogi on September 21, 2009, 06:48:36 PM

Hi guys just wondering what the compression should be on the Aircooled super 9, Ive carried out a compresion test and it's only reading about 80 psi at WOT spun over about 10 times......Any help appreciated  :)

Title: Re: Low compresion Super9s
Post by: OldGuy on September 21, 2009, 11:44:12 PM

To take an accurate compression test the motor needs to be fully warm and the throttle fully open. Cold and/or the throttle closed will cause low readings.

Title: Re: Low compresion Super9s
Post by: zombie on September 23, 2009, 12:06:38 AM

Should be right at 100. You may want to put in a set of rings. You can take the glaze off the cylinder w/ 600 grit emory paper, and a good oil. ONLY CUT in a circular motion around the inside. Never from top to bottom

Title: Re: Low compresion Super9s
Post by: yogi on September 23, 2009, 06:06:10 PM

Thanks for the replys guys, i'll check it again tomorow when it's warm .