Gaskets and Seals› Engine Gaskets and Seals
TwinPower
Twin Power 17-Up M8 with 4.25 Big Bore Kit 4.25in Head/Base Gasket Kit .030-.014 MLS
SKU: T09O 042124
Description
Part #: 042124
Cylinder Head and Base Gasket Kits for 124" and 128", oil-cooled or water-cooled models, with 4.25" Big Bore Cylinders. This is a strictly bolt-on kit, as the special gaskets eliminate the need to weld and modify oil or water passages. Gasket kits are available with either .030" or .040" thick gaskets . The Cylinders are offered in a factory-style black texture finish with highlighted fins. Cast-iron liners ensure strength, durability and quiet operation.
4.25 in., Big Bore Gasket Kit .030-.014, MLS
MIA's Description
It is a strictly bolt-on kit, eliminating the need for welding or modifying oil or water passages. The kit is compatible with 17-Up M8 engines.
Fitment
Fitment Guaranteed
Don’t gamble
on fit.
Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | TwinPower |
| Part Number | T09O 042124 |
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
View Full Return Policy