February 3, 201313 yr Ok I've had my m91 250 for a couple of years now and after two trips to the French 4 day she is deffinatly ready for a rebuild. Just wanted some advice on the piston, my dad has a 340 and says to go for a mahle just wondered if anyone had tried anything else and with what result? Also going to replace the carb, is dellorto the carb of choice and if so would I stick to a 26 or up to a 28? Also would anyone happen to know the standard shock length on a m91? It seems I bottom the rear end out more than expected and as the shocks aren't standard I wondered if this could be a factor.
February 3, 201313 yr I believe Mahle was considered the best available in the day; I'm not sufficiently familiar with what others use nowadays to say whether this still applies. This possibly raises two other questions, though : would a Mahle item be unobtainium?.......or simply unaffordium ? Suspension spring rates will have more influence on the tendency (or not) of a shock to "bottom out" than its length......... Edited February 3, 201313 yr by lorenzo
February 3, 201313 yr I believe Mahle was considered the best available in the day; I'm not sufficiently familiar with what others use nowadays to say whether this still applies. This possibly raises two other questions, though : would a Mahle item be unobtainium?.......or simply unaffordium ? Suspension spring rates will have more influence on the tendency (or not) of a shock to "bottom out" than its length......... NOS Mahle piston with rings and piston pin was around 145 € in 2011, as I know still available.
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