As for them not having other spares, where do you think I got all the consumable parts for rebuilding the two we have? HRC of course. Some parts you have to wait for, some are next day.
The very reason we went for a pair of 500V's was the avalibility of parts. I really wanted a RS500 but the parts were just too hard to obtain in use-able condition.
If you would like to buy some pistons though I can sell you some, and they won't be $1000+ each
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If I have to take the carbs off once more...