There's only two states for my NSR... flat out or parked! 
Like I say, my '21 has been fed fully synthetic all it's life (apart from those first 3000 that it was in Japan which I can't account for!) but it was still out of tollerance when pulled apart last week.
20000 miles (30000kms) isn't bad for a 2T crank on what really is a high performance engine - you wouldn't get that out of many 240bhp/ltr 4-strokes!
Let's say, for example, you had a 1991 MC21 with 35000kms, that's an average of 2333kms per year, not a great deal admittedly, but that's 15 years of asking 5 crank seals (left, centre, and right, plus 2 seals built into the centre main) to hold out in a rather harsh environment, and big-ends and mains to run in nothing but a mist of fuel-oil. It's not like a 4-stroke where the brearings are force fed lubrication under pressure from a dedicated pump! But, divide the cost of a crank by 15 years, and you get something like US$35 a year! Hardly breaking the bank is it?!
If I bought an NC30 with 30-35000kms on the clock, I'd expect to overhaul it - either that or only expect it to make 55hp, so it's as broad as it's long in my opinion.
If you consider your mechanical ability as high, you'll do a top end in 1/2 a day. After the first couple, you'll have it down to a couple hours. I can do a cylinder in about 35 minutes with all the tools and parts to hand... in the dark! I imagine Matt from TYGA can almost half that!!
_________________
Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.
Check us out on Facebook! Please "like" our page!
Last edited by Andy on Sat Feb 18, 2006 7:48 pm; edited 1 time in total