whdave 1 #1 Posted July 11, 2010 Is there any kind of isolation fir the Onan 20 HP Engine?? This thing runs great but shakes the tractor. No rubber mounts like the days of old I guess? Share this post Link to post Share on other sites
TT-(Moderator) 1,147 #2 Posted July 11, 2010 The "days of old" were actually solid-mounted engines too. Onan twins are usually quite smooth...... I wonder if you don't have some other sort of issue. Are you sure it's running on both cylinders? Share this post Link to post Share on other sites
stevebo-(Moderator) 8,409 #3 Posted July 11, 2010 I agree with Terry on this. The 520 with the Onan is one of the smoothest running tractors I own. Check to see if running on both cylinders and then check to make sure the motor bolts are all tight. Good luck- Share this post Link to post Share on other sites
6wheeler 668 #4 Posted July 11, 2010 :D Maybe it has a Harley engine in it Potato potato... Share this post Link to post Share on other sites
whdave 1 #5 Posted July 12, 2010 mid range very smooth, about 3500 RPM's some noticible vibration, couple of aluminum pieces in the oil at the oil change, it has 1125 hours on it, I bought it the way it is and just thought maybe bad gas but I am now wondering if the metal pieces are piston skirts or something major, no knocking or obvious noises?? Motor bolts were loose though. Maybe not a good deal at $1000.00 but the hydro is a real powerhouse :thumbs: Share this post Link to post Share on other sites
Raider12 13 #6 Posted August 7, 2010 Maybe it has a Harley engine in it Potato potato... Hummmmm ...... Harley enigne mounted on a 520? Im thinking on this one! Might be a good idea? Share this post Link to post Share on other sites
Shuboxlover 479 #7 Posted August 7, 2010 I have heard of these things running on just one cylinder after one of the rods broke :thumbs: Share this post Link to post Share on other sites
rickv1957 73 #8 Posted August 7, 2010 An Onan that is vibrating has a problem some where as they run very smooth in good condition,Rick Share this post Link to post Share on other sites
