weird tank part is leaking gas

[Kaizer]

Thanks. I think the previous owner did that. I dont have the instruments to do a valve check and rejet check. How much would I have to pay to have a mechanic do those checks? Let me know what is the norm.

[ben2go]

Between $200 and $350.It depends on the shop.If it's a dealer, you'll pay a premium price for a so so job.If it's an independent shop,you'll pay less and get a premium job.The jetting will take some ride and tune time,unless the shop has a dyno.If they have a dyno the price will go up a lot.That's why most of us prefer to do it ourselves.There are really no special tools to adjust valves,clean carbs,check the jetting or rejet.Buddha on here will clean and rejet your carbs.You have to remove them,send them to him with your air filter and exhaust specs.To do the carbs and valves, you need a set of metric allen wrenches,phillips and flat screw driver,pliers and metric feeler gauge that goes down to .03 mm.Here check these links.

http://cgi.stanford.edu/~sanjayd/gs500/Maintenance/CheckValves

http://gstwin.com/rejet.htm