Please note:

The centre seal on all 1989-1997 NSR250s is integral to the centre bearing. The O-ring around the outside of the centre bearing IS NOT the main centre seal on these cranks.

The crankshaft on ALL YEARS must be split to replace the [main] centre seal.

A bad centre seal can indeed, and almost certainly will, cause poor starting.
_________________
Andy.
NSR-WORLD.COM

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