THE 3-Cylinder Secret? Yamaha GX750 Inspection – Stem OH, Oil/Fluid Change, Caliper Cleaning, and More

Between 2-cylinder and 4-cylinder… that’s exactly what the 3-cylinder feeling is like. It’s just right.

Quite a rare bike? The GX750, or XS750 overseas, has confusing names depending on the region.

Disassembling the front end.

It came off! The grease was almost completely depleted.
Despite that, there weren’t many impact marks.

We’ll replace the dust cover and nuts with new ones too.

There’s no universal tool to remove the race.

Even my usual Park Tool struggles with tapered rollers.
I removed the upper side with a Suzuki OEM special tool, and the lower side with a custom-made axle shaft that I welded and modified.
*The lower side has a removal groove cut, but it’s tight!

For now, we won’t be disassembling it, so I gave it a thorough cleaning.

Press-fitting is done by ‘tapping/screwing/hydraulic pressure’.

I want to work gently when press-fitting stem bearing races.

When it comes to press-fitting, minimizing damage to the mating surface might be a sign of love.
It’s easy to mess things up by going at an angle, so it’s all about preparation—first preparation, second preparation.

The process is: The upper side goes in easily, so I usually just tap it in.
The lower side is basically press-fitted with hydraulic pressure.
Using the upper side as a reference, creating a situation where it won’t wobble first makes the work reliable.

If you try to tap the lower side in, the posture and surrounding parts will likely obstruct the work.
Also, sometimes in the past, it was press-fitted at an angle, leaving scratches on the frame side, making it impossible to insert it straight.
Preparing and working according to the situation reduces risk.

No way! Absolutely not! I think working with a power-play mindset is the key.

THE Koshihara? Stem Adjust Wrench is excellent.

Honestly, I’d like one from each manufacturer.
It’s a standard tool for Suzuki oil-cooled bikes, but other manufacturers mainly use hook wrenches.

I bought it thinking I’d use it, and it made the work so much easier! ◎

Compatible with Yamaha 90179-25003 nut.

The thin fork has fender clearance, so adjust it.

Even removing and attaching the fender causes slight bending.
If you can reduce this gap, the thin fork will work better. It becomes stress-free.

On old bikes with thin parts everywhere, small stresses add up and have a big effect, so please handle them with care.

The oil is Shell Advance Blend.

15W-50 is too thick, and 10W-40 is too thin.
Recently, I’ve been mixing them to adjust the viscosity.

I quickly ordered the discontinued filter.

Caliper cleaning and fluid replacement.

Since we did an overhaul recently, the condition was VERY GOOD.

It was a bit dirty. I also replaced the step rubber.
All done!