Choosing the right engine mounts is essential for pit bikes and small dirt bikes, ensuring engine alignment, vibration control, and long-term durability. This guide highlights five reliable engine mount bolt kits that fit 50cc to 150cc pit bikes, ATV dirt quads, and similar small-engine machines. Each option offers different lengths, bolt diameters, and included hardware to fit a variety of models. The table below provides a quick snapshot of the highlighted products to help you compare at a glance.
| Product | |||
|---|---|---|---|
| PRO BAT 2pcs 8mm x 115mm | 8mm, 115mm | 2 bolts, 2 nuts, 1 wrench | Solid top & bottom mounting bolts for many 50cc–125cc engines |
| Windance 8mm x 115mm | 8mm, 115mm | 2 sets bolts and nuts | Universal fit and corrosion-resistant alloy steel |
| PRO BAT M8 x 100mm | 8mm, 100mm | 1 bolt, 1 nut | High-tensile steel, compact 100mm length |
| PRO BAT 8mm x 115mm (Top & Bottom) | 8mm, 115mm | 1 bolt, 1 wrench | Single-bolt option with 115mm length |
| YD-PS001 M8 Set | 105mm & 110mm | 2 bolts, 2 nuts | Dual-length kit for versatile fitment |
PRO BAT 2pcs 8mm x 115mm Engine Mount Bolts
The PRO BAT kit includes two 8mm engine mounting bolts designed to fit a wide range of pit bikes from 50cc to 125cc. Each bolt measures 115mm in length, with a total length of 122mm, and comes with two nuts and one wrench for quick installation. The kit targets top and bottom mounts, providing a secure, rigid connection between the engine and frame. It’s suitable for compatible pit bikes and ATVs, delivering reliable torque retention under riding conditions.
Windance 8mm x 115mm Engine Mounting Bolts Nuts
Windance offers a complete bolt-nut set designed for 50cc to 125cc pit bikes, ATVs, and quad bikes. Each bolt is 115 mm in length with an 8 mm diameter and a 1.25 mm pitch, providing a universal fit across a broad range of models. The set emphasizes robust alloy steel construction, enhancing strength and resistance to corrosion in outdoor environments. This kit is ideal for riders seeking durable fasteners that accommodate multiple configurations and bike models.
PRO BAT M8 x 100mm Engine Mounting Bolt
This PRO BAT bolt features high-tensile steel to handle engine mounting stresses on 50cc–150cc pit bikes and four-stroke setups. The bolt length is 100mm with a total length of 107.5mm, and the package includes a matching nut. The design focuses on reliability and ease of replacement, making it a practical choice for riders performing routine maintenance or upgrades to their engine mounting hardware.
PRO BAT 8mm x 115mm Top & Bottom Bolts
This variant mirrors the universal 8mm mounting bolt niche, optimized for pit bikes from 50cc to 125cc. It includes one 8mm engine mounting bolt and a wrench, with a length of 115mm (4.5 inches) for the bolt and 122mm (4.8 inches) total length. The straightforward kit suits riders seeking a dependable, quick-install solution for both top and bottom mounts in common pit bike configurations.
M8 Engine Mount Bolt Set M8 x 105mm & 110mm
Designed for pit dirt bikes and small motorcycles, this M8 bolt set includes two bolts—105mm and 110mm—along with two nuts. The dual-length approach supports different mounting configurations and engine placements, helping ensure proper alignment across multiple models. The kit is presented as a practical option for riders who need precise fitment across a range of engines and chassis designs.
Buying Guide: How to Choose The Right Pit Bike Engine Mounts
Engine mounts must keep engines aligned, reduce vibration, and withstand the stresses of off-road riding. When selecting mounts, consider the following aspects to ensure a proper fit and solid performance.
- Engine compatibility: Verify that the bolt diameter (common sizes are 8mm) and the bolt length match your engine casing and frame mounting points. Pit bikes vary from 50cc to 150cc, so confirm the correct length for top and bottom mounts.
- Material and finish: High-tensile steel and alloy steel offer superior strength and corrosion resistance, especially for outdoor use. Rust-proof coatings extend service life in humid or muddy conditions.
- Hardware included: Some sets come with nuts and a wrench, which simplifies installation. Check whether you need extra nuts, washers, or spacers for your specific model.
- Length and fitment options: Sets with multiple lengths (such as 105mm, 110mm, or 115mm) accommodate different engine and frame geometries. A dual-length kit can cover more models.
- Installation effort: Consider bolt head type, ease of access, and whether you can install without removing major components. Simpler kits save time during maintenance.
- Mounting topology: Some kits are designed for top and bottom mounting, while others target only one mounting point. Ensure the kit aligns with your bike’s design and the engine mounting pattern.
- Supplier reliability: Choose reputable brands with positive reviews and clear product details to ensure the bolts meet mechanical tolerances and quality standards.
When assessing options, balance length, diameter, and included hardware with the specific model of pit bike you ride. A well-matched set reduces unwanted movement, maintains chain and belt alignment, and supports smoother operation under throttle and impact loads. For riders planning upgrades or replacements, keeping spare bolts of the same specification can prevent downtime and simplify future maintenance.