I picked up a parts bike, an 83, same as mine, but mine has an 86 engine. The 83 1200 only has 11673 mi. on it, so i pulled the carb tops, and the diaphrams were like new! So, I used my 86 needles, and the 83 1200 slides, and it runs good, however, it high idles from one slide sticking. Should I drill the slides holes bigger, or not worry about it?? BTW, the 83 needles were much thinner, more agressive taper, and had plastic washers like my 86... I was told that 83's had adjustable needles, with 5 pos. clip, like old school bikes. Any ideas why this one had plastic shim on needles like my 86 did? I am using 2 brass washers on 86 needles, and runs good, 43 mpg.