It all depends on the fuel you use and the kit. I ran 20psi on my 2000 for over a year till i turned it up to 23 and bent the wrist pins? So even with a safe tuneup it's a crap shoot to what yours will take total.
A well tuned stock motor with pump gas and 8psi boost will last for 20-30,000 miles if your not abusing it. I have a bunch of regular street guys out there making 8-10 psi on pump with 0 issues. The only guys i see have any issues are the guys that want to top out the bike every time they go ride. If that fits you then buy an intercooled kit, lower your compression and run better fuel when you go out.
so with all stock bike i can run about 10psi easily and not hurt it... i the guy to just go out and ride and do the occasional hammering on it not all out all the time... what kind of spacer are we talking about here?? sorry for the newbie questions...
really depends on the turbo. think the mr turbo's needed a lot more boost to run same numbers as newer kits. the pistons are good till about 350, rods about 300, others have gotten more, but these are the typical accepted numbers most stick too. 10psi is about the limit on stock compression if you have a really nicely designed turbo (like ghetto...), but this is a little pushing it. most will put on the spacer at 8+ psi or an intercooler or water inj. some do a combo os those as well. 6-8 psi is what i am currently looking for on my setup (homemade) and shooting for mid 200's.
ps, after making my kit, i can understand why most people say to just buy a kit....there is a LOT of work that you wouldn't really think about in the process. i studied many peoples kits, both homemade and bought. the way tey installed, what they used...and so forth. LOTS of work. that being said though, i wish more people would...kinda catch 22 i guess. i am sure you will enjoy it either way ya go.
With the likes of JE turbo pistons 080 spacers are necessary as the piston is .080 thicker between the piston pin and deck
can also bump comp on a std motor by removing the std base gasket and use a sealant (if you check clearances and confirm piston /head and valveclearance)
the cylinder sleeves are not an integral part of the block. much like the head is separate from the cylinders.
if you look just above my finger in te photo, you can see that there is a line down the engine. this is where the cylinders separate from the block itself. so, put a spacer there, and the cylinders dont go any hgher than before, and the head is now further away....less compression
if youre gunna boost a stock motor be safe about it and get some "insurance". Gary Evens (hes on this site) told me about this. put in an over boost ignition cut out switch. http://tinyurl.com/ymvgrv
my bike over boosted and killed the motor. wish i knew about this switch last year....