ZEPHYR550/400 (ZR550) Zephyr 550/400 used bike maintenance (compression pressure spark plug) cold compression, ignition plug, carburetor synchronization

Well then,
this is a ZEPHYR550.
Quite a bit of time has passed,
and I’d like to gradually freshen it up.

Ideally,
it starts on the first try every time!

Whether the starting is good or bad
really changes your mood completely (*´ω`*)

I checked the current condition with cold compression.



After that,
I replaced the spark plug from DR8EA to JR8B
carburetor synchronization in that order.

To be honest,
at this point,
there wasn’t a major improvement.

However,
spark plug/compression/synchronization
as the cause of the problem
could be ruled out.

It would be nice if we could figure it out in one shot,
but troubleshooting
is a process of elimination.

It’s important to make steady progress!

(´ー`) Carbureted bikes are fun when you change the spark plug.

日本特殊陶業(Ngk)
¥898 (2026/09/21 15:35時点 | Amazon調べ)
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