The only real problem I have had with my Sport City is a leaking fork seal. I had the left fork seal replaced under warrantee but it eventually it started leaking again. The right tube was also leaking slightly. The Aprilia Tech at Rider's Hill suggested I try something that one of his customers recommended. What he recommended was Dow Corning Molykote 55 O ring Lubricant. It is a grease that is claimed to lubricate and slightly swell seals. I got a tube of it from Amazon.com for around $25. I pulled up the dust seals on my fork tubes, put some of this stuff all around the fork tubes just above the fork seals, put the dust seals back in place and then bounced the suspension up and down a few times. Then I let it sit overnight. Since then I have ridden a few times and there has been no oil on the fork tubes. It appears that it worked but only time will tell if it's a long term fix.