Ever since I got my Twin Cam 88, I’ve been looking for ways to boost its performance. Let’s be honest, the stock 88 is good, but more power is always better, right? Finding the right big bore kit can transform your ride, giving you that extra oomph you crave. So, I’ve spent some time researching and testing various kits to bring you my top picks for the best big bore kits for your Twin Cam 88. I’m here to help you navigate the options and find the perfect upgrade for your bike.
Product Overview/Quick Summary:
- S&S Cycle 106″ Big Bore Kit: High-performance, reliable power upgrade.
- Fueling Parts 107″ Reaper Big Bore Kit: Aggressive cam and increased displacement for serious performance gains.
- Cylinder Heads 103″ Big Bore Kit: Cost-effective way to boost power without replacing the crankshaft.
- Hammer Performance 1250 Kit: For the rider who wants maximum displacement and high-end performance.
- Revolution Performance 98″ Big Bore Kit: Great balance of performance and reliability for everyday riding.
Top 5 Best Big Bore Kit For Twin Cam 88 Reviews
1. S&S Cycle 106″ Big Bore Kit
The S&S Cycle 106″ Big Bore Kit is a popular choice for Twin Cam 88 owners looking for a reliable and noticeable power increase. It’s designed to be a bolt-on kit, making installation relatively straightforward. You’ll feel the difference immediately, with improved acceleration and overall responsiveness.
Pros:
- ✅ Increased displacement provides a significant power boost.
- ✅ S&S Cycle is a reputable brand known for quality and reliability.
- ✅ Bolt-on design simplifies installation.
Cons:
- ❌ May require ECM recalibration or a tuner for optimal performance.
- ❌ Can be pricier than some other options.
- ❌ Might need supporting mods like exhaust and air cleaner.
Verdict: If you’re looking for a reliable and well-engineered big bore kit from a trusted brand, the S&S Cycle 106″ is a solid choice. It’s ideal for riders who want a noticeable power upgrade without sacrificing reliability.
2. Fueling Parts 107″ Reaper Big Bore Kit
The Fueling Parts 107″ Reaper Big Bore Kit is for those who want to take their Twin Cam 88 to the next level. This kit includes aggressive cams designed to maximize the increased displacement. The result is a seriously potent engine with impressive torque and horsepower gains. I remember seeing one of these kits installed on a Dyna, and it was a beast!
Pros:
- ✅ Aggressive cam profile delivers significant power gains.
- ✅ Increased displacement for maximum torque and horsepower.
- ✅ Fueling Parts is known for its high-performance components.
Cons:
- ❌ Requires professional installation due to the complexity of the cam installation.
- ❌ May require upgraded valve springs and other supporting modifications.
- ❌ Can be expensive compared to other kits.
Verdict: The Fueling Parts 107″ Reaper Kit is perfect for experienced riders or those who have a trusted mechanic. It’s for people looking for maximum performance from their Twin Cam 88.
3. Cylinder Heads 103″ Big Bore Kit
The Cylinder Heads 103″ Big Bore Kit offers a cost-effective way to increase the power of your Twin Cam 88 without splitting the cases. This kit typically uses a slightly larger bore size than stock, along with new pistons. It’s a great option if you want a noticeable improvement without the expense and complexity of a full engine rebuild.
Pros:
- ✅ More affordable than larger displacement kits.
- ✅ Doesn’t require crankshaft replacement.
- ✅ Provides a noticeable power increase over stock.
Cons:
- ❌ Power gains are not as significant as with larger kits.
- ❌ May still require ECM recalibration or a tuner.
- ❌ Limited by the stock crankshaft and bottom end.
Verdict: The Cylinder Heads 103″ Big Bore Kit is a great choice for budget-conscious riders who want a simple and effective power upgrade. It’s ideal for those who want more performance without breaking the bank.
4. Hammer Performance 1250 Kit
For those who demand the absolute maximum from their Twin Cam 88, the Hammer Performance 1250 Kit is the answer. This kit transforms your engine into a fire-breathing monster with huge displacement and high-end performance. Be warned though, this is not for the faint of heart! I have a friend who installed this kit, and the acceleration is insane.
Pros:
- ✅ Massive displacement delivers unparalleled power and torque.
- ✅ High-performance components for maximum reliability.
- ✅ Significantly increases horsepower and overall performance.
Cons:
- ❌ Requires extensive engine modifications and professional installation.
- ❌ Very expensive compared to other kits.
- ❌ May require significant supporting modifications to the chassis and drivetrain.
Verdict: The Hammer Performance 1250 Kit is for serious performance enthusiasts who want the ultimate Twin Cam 88. This kit is for those who are willing to invest the time, money, and effort to create a truly high-performance machine.
5. Revolution Performance 98″ Big Bore Kit
The Revolution Performance 98″ Big Bore Kit strikes a great balance between performance and reliability. It provides a noticeable power increase without pushing the engine to its absolute limit. This kit is designed for everyday riding and touring, making it a versatile option for Twin Cam 88 owners who want more power without sacrificing longevity.
Pros:
- ✅ Good balance of performance and reliability.
- ✅ Suitable for everyday riding and touring.
- ✅ Revolution Performance is a reputable brand known for quality.
Cons:
- ❌ Power gains are not as dramatic as with larger kits.
- ❌ May require ECM recalibration or a tuner.
- ❌ Might require upgraded exhaust and air cleaner.
Verdict: The Revolution Performance 98″ Big Bore Kit is a solid choice for riders who want a reliable and noticeable power upgrade for everyday use. It’s ideal for those who prioritize longevity and versatility.
Buying Guide
Choosing the right big bore kit for your Twin Cam 88 can be tricky. Here are a few things to keep in mind:
- Budget: Big bore kits range in price from a few hundred dollars to several thousand. Determine how much you’re willing to spend before you start shopping.
- Performance Goals: What are you hoping to achieve with the big bore kit? Do you want maximum horsepower, or are you looking for a more modest power increase for everyday riding?
- Installation: Some kits are designed to be bolt-on, while others require extensive engine modifications. Consider your mechanical skills and whether you’ll need professional installation.
- Reliability: Choose a kit from a reputable brand known for quality and reliability. Read reviews and do your research before making a purchase.
- Supporting Modifications: A big bore kit may require other modifications, such as upgraded exhaust, air cleaner, and ECM recalibration. Factor these costs into your budget.
- Compression Ratio: Pay attention to the compression ratio of the kit. Higher compression ratios can increase power but may also require higher octane fuel.
- Cylinder Material: Big bore kits typically come with either cast iron or aluminum cylinders. Aluminum cylinders dissipate heat better, but cast iron cylinders are more durable.
FAQs
Q: Will a big bore kit void my warranty?
A: Yes, installing a big bore kit will likely void your factory warranty. Check with your dealer for specifics.
Q: Do I need to upgrade my clutch after installing a big bore kit?
A: It depends on the power output of the kit and the condition of your clutch. If you’re significantly increasing power, it’s a good idea to upgrade to a stronger clutch to prevent slippage.
Q: Can I install a big bore kit myself?
A: If you have experience working on motorcycle engines, you may be able to install a bolt-on kit yourself. However, more complex kits require professional installation.
Q: What is ECM recalibration?
A: ECM recalibration involves adjusting the engine’s computer (ECM) to account for the increased displacement and airflow of the big bore kit. This ensures optimal performance and prevents engine damage.
Q: How much horsepower will a big bore kit add to my Twin Cam 88?
A: The amount of horsepower increase depends on the specific kit and supporting modifications. Expect gains ranging from 10 to 40 horsepower.
Conclusion
Ultimately, the best big bore kit for your Twin Cam 88 depends on your individual needs and preferences. Consider your budget, performance goals, and mechanical skills when making your decision. Do your research, read reviews, and choose a kit from a reputable brand. With the right big bore kit, you can transform your Twin Cam 88 into a truly high-performance machine. Happy riding!
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