My 1981 XT 250 has started leaking oil at the kickstarter and the front sprocket. It got so bad I quit riding it last year. I'd like to replace the seals, but I haven't been able to find a source. Can anyone tell me where to get a seal kit? Also, how hard is it to replace them? I don't mind pulling the right cover off to replace the kickstart seal, but what about the left side?