Hyster forklifts running a Mazda M4-121G engine use a different tune-up kit than the VA/UA models — part number 996103. Mixing these up is a common mistake, so it's worth confirming your engine tag before ordering.
Signs your M4-121G engine needs this kit
- Rough or uneven idle
- Hesitation or misfire under load
- Hard starting, especially cold
- Preventive maintenance ahead of a busy season
Compatibility
This kit is built specifically for the Mazda M4-121G engine as used in Hyster forklifts. Double check your engine plate — Hyster used several different Mazda and non-Mazda engines across its model range, and the wrong kit won't fit correctly.
What's included
The 996103 kit bundles the ignition components needed for a complete tune-up on the M4-121G, so you're not sourcing plugs and related parts separately.
Installation overview
Swap ignition components one at a time to keep wire routing and firing order clear. Gap and torque new components to Mazda spec, then start the engine and confirm a smooth, even idle before closing everything back up.
Get the part
We stock the 996103 kit ready to ship. View the Hyster 996103 tune-up kit →