I've had my MC21 since about 3000kms, but it's done 30K+ of hard use! 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!!
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Andy.
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Last edited by Andy on Sat Feb 18, 2006 7:48 pm; edited 1 time in total