i am having an issue with a 1975 rd 200 and am looking for any one who has had any experience working on these bikes. we just replaced the condensors and points and it runs a little better but the bike still will not rev over 5000 rpm and runs down the road like %!ยค. the carbs have completley been gone through and it also has new spark plugs and wires and caps. any sugestions will help.