Engine kit fits XT600, SRX600, TT600 1983-1989 (1990 and up xt600 is slightly different, we can do the kit, just ask)
this kit is all socket allen. with no knurls.
These are highly polished stainless fasteners, not just a bag of bolts, comes with instructions, and sorted. specifically designed to fit 1983-1989 SRX 600, TT 600, XT 600

kit includes: engine YAMAHA SRX/XT/TT 600 a:right crankcase cover 13 pieces b:left crankcase cover 11 pieces c:cylinder 6 pieces d:cylinder head 25 pieces e:exhaust 4 pieces f: sprocket cover 2 pieces 59 pieces

here's a pic of another kit we do - so you can see the quality/finish