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Old 10-10-2013, 06:57 AM
FMB42 FMB42 is offline
Motorized Bicycle Elite Member
Join Date: Sep 2013
Location: Idaho
Posts: 107
Default Re: How durable are these engines?? 66cc

Chrome and Nikasil failures do occur (a growing number of companies specialize in "re-plating" Nikasil cyliners of all types). However, most of these "failures" are most likely caused by excessive piston clearances, FOD, piston/ring seizures, and high sulfur content fuels rather than a failure of the plating itself. Modern Nikasil bores are occasionally known for premature failure due to manufacturing defects (such as excessively thin plating and improper cylinder preparation prior to the plating process). Otherwise, they're known for lasting through as many as 6 piston changes in high performance engines (in other words, they either fail "right away" or they last "forever" ).

Here's a couple of links with more info on the subject:
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