KAWASAKI ninja250SL drive-sprocket and noise

[Japanese(日本語)]

Annoying noise

I bouht a second hand KAWASAKI ninja 250 SL  in December 2023. But I was annoyed by the strange noises which become bigger when I run 5th or 6th geer. I heard the sound of iron or something scraping.I bring my motorcycle to the shop but they said that it was no problem. I was not convinced, so I researched it on the internet and I got an information.  The drive sprocket which is not a genuine parts sometimes makes a wired noise, because of lacking a rubber which makes noise easy.

I opened the sprocket cover and noticed that the previous owner changed the drive sprocket to SUNSTAR 378. And the chain guide plate was scratched abnormally. The chain guide plate was set upside down. I guess the previous owner might made a mistake.

I thought the strange noise was come from this upside down chain guide plate. I tried to run without the chain guide plate, But it still made the strange noise. I guess the chain guide plate was already fully scratched not to make the noise.

	SUNSTAR 378
	scratched chain guide plate. In this picture, the chain guide plate was set upside down.
	You can see the chain guide plate over the cover, If you set the guide correctly.

Changing the drive sprocket

I went to a motorcycle supplies store and ordered the genuine part(KAWASAKI 13144-0577) and have it changed.
that made the strange noise gone. ( additionally, the shop clerk scrape the chain guide plate to set normally)

SEIKO 4R35 position accuracy

[Japanese(日本語)]

I checked SEIKO SZSB011(4R35 movement)  gain/lose every 12 hours for 1o days with changing the position.

This watch gains between 6 sec and 10 sec per 24 hours.
and loses between 15 sec and 20 sec per 24 hours.

adidas ADIZERO BOSTON 11

[Japanese(日本語)]

I bought an adidas ADIZERO BOSTON 11 on march 2023.
But, when I run with these shoes, my instep of my right foot hurts.

Even loosening the shoelace did not help.
the shoe tongue of this shoe is connected with the sole and it is very tight.
finally I cut the tongue of this shoe, and now, the shoes are very confortable for me.