“The Oil-Cooled Legend Starts Here!” GSX-R750 GR71 Inspection, Spark Plugs, Engine Oil, Fluids and More

The spark plug cord is stiff = we have an additional request to replace it.
The parts have arrived, so let’s go ahead and swap them out!

Regarding the rear brake switch spring possibly being too short
I recall this type works well when the return spring is fixed underneath.
This clears the issue (*´ω`*)

Suzuki 33410-31311 P90mm Ignition Coil – Primary side approximately 4Ω coil
When you order from RR, this is what arrives. The cord is long and it’s fantastic.

The stock cord has already developed shape memory.
Well, it’s been in use for nearly 40 years now.

Roughly around 4Ω. Well, you don’t really need to look at it anyway…

Labeling the coils makes future work much easier (*´ω`*)
We often remove the coils when taking off the head cover.
Rather than marking with a marker each time, having proper labels is easier and cleaner.

Back in the day I “Tepura” label makers, but when removed, the “color residue” and “weakness to chemicals/solvents”
After researching various options, I settled on the Brother P-TOUCH.
I’ve shown this on YouTube before, but “acetone” doesn’t erase the text…
It’s amazing… really…

If you’re unsure, P-TOUCH is the way to go. By the way, I use it all the time, so it’s the 9mm width.
If I were buying new, I’d go with the PT-P710BT.

Just a heads up – ignition coils have polarity, so please be careful (it’ll fire even reversed, but…)
We’re changing the mounting bolts to flanged (iron) ones. The positive side is generally less efficient.

Screwing the cap onto the stock plug cord is extremely tedious, and “Is it in?” I’d say there’s a 100% chance of doubt…
Let me share my method for making it easier and more reliable to insert.

Using something like a drill bit, aim for the center conductor of the cord and “pierce it!” This creates a pilot hole, making threading much easier.
Next, check the depth on the plug cap side.
Knowing how far to thread it in by “numbers” makes it reliable.

It’s not that loud, so as long as it’s in reasonably far, it’s OK .
If you think about it, we’ve been threading without any standard before, so “that’s quite an improvement” ?

If you don’t stop threading at some point, “the cord side becomes loose” so please be careful

This is how we laid out the spark plug cord.
Subtle attention to detail Cords 1 and 4 / Cords 2 and 3 can be swapped and we’re aiming for clean routing.
If the spark plug cords are made “too short” then “recovery becomes impossible” so we want some slack.

The numbering is of course done with P-TOUCH.
And just my personal opinion, but “numbering that clamps the cord” I’d prefer if you… didn’t do that
There’s a non-zero chance of it coming off.
For people who have this installed, “remove it once, mark with marker, then reinstall after work”
Personally, I’m too nervous to remove the plugs…
If you can take responsibility yourself, it’s OK! Our shop says no though~

We changed the engine oil and filter to Shell Advance winter blend.

This tail cowl really suits the GR71 too, I thought to myself.
All that’s left is a test ride and we’re done~

Today’s “gem”

株式会社ヒロチー商事 楽天市場店
¥10,427 (2026/09/22 16:35時点 | 楽天市場調べ)
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