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Top End Rebulid on xt600

Joined
Mar 4, 2007
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#1
hey i am planning to do a top end rebuild on my 1991 xt600.. i wanna send the head to the machine shop and have them do a vavle job for me and get them to bore out my cylinder a bit.. i never really been to a machine shop so. do i bring them new psiton and ask them to make it fit the cylinder? lol. also i dont have the tool to measure my cylinder so what piston should i buy. i know PISTON STD is prob.. stock ones but what are the other 2.. any ideas on how much it would cost for the machine shop?

PISTON STD
3TB-11631-00-Y0

PISTON 2 O/S 0.50 AP
3TB-11636-00-00 1

PISTON 4 O/S 1.00 AP
3TB-11638-00-00


thanks
 
Joined
Oct 19, 2006
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#2
The manufacturer of the piston should provide you with the information necessary to set up the bore properly. Piston to cylinder clerances are typically .0015-.0035" Just add that on to the outside diameter of the piston and that is what your finished bore diameter should be. The size of the piston will be usually be stamped somewhere on the crown. STD or no markings would indicate standard. Otherwise, there will be a number which inidicates the oversize, 0.5 or 1.00 somewhere on the piston. Machine shops usually charge $60-90 to bore a cylinder.
 
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Oct 19, 2006
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#4
No, and it really depends on what you need done. If the head just needs the valves lapped, you may be out less $100. If the valves, springs, and guides are bad, you could be out $600. If the seats are bad, you're getting to the point where you may have to scrap the head.
 
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#6
Yeah, they will inspect everything for you. It's nice if you have the tools to double check when they're done, but they're usually pretty good at what they do.