A reed valve kit for motorised bicycles that aims to sharpen intake control and throttle response. Riders wanting crisper acceleration and fewer flat spots will appreciate what CDHPOWER Racing Reed Valve Kit can deliver. Is it the right upgrade for 66cc and 80cc cylinder setups?
⚡ At a Glance
- • Flow Performance: Carbon fibre petals designed to respond quickly to intake pulses, improving airflow control
- • Best for: Owners of 66cc and 80cc motorised bicycles seeking improved throttle response
- • Not ideal for: Engines that require proprietary or non-standard reed plate dimensions
Carbon fibre petals and defined neck dimensions suit 40mm and 32mm stud spacing. Neck length ranges from 1.06 inch to 1.65 inch with inner and outer diameters of 0.63 inch and 0.75 inch.
Quicker throttle response – thanks to carbon fibre petals
Carbon fibre petals flex under intake vacuum and snap back to seal the reed seat, allowing rapid opening and closing with minimal deformation. The material choice reduces weight of each petal while keeping stiffness consistent under load.
Faster valve action sharpens acceleration and reduces hesitation during throttle changes, especially useful for stop start riding and steep inclines.
Broad cylinder compatibility – with 40mm and 32mm stud spacing
Designed for cylinders that use either 40mm or 32mm stud spacing, matching common mounting patterns for 66cc and 80cc motorised bicycle engines. Mounting aligns to a steel reed plate, though small washers are excluded.
Straightforward swap for many standard setups without need for bespoke adapters, cutting installation time for routine upgrades.
Consistent intake sealing – with defined neck measurements
Neck length varies between 1.06 inch and 1.65 inch, with inner diameter 0.63 inch and outer diameter 0.75 inch, dimensions intended to match typical intake ports. The measured neck helps control airflow velocity into the combustion chamber.
Proper neck sizing reduces air leakage and helps maintain steady mixture delivery across the rev range, improving midrange tractability.
✨ The 4 Key Reasons for CDHPOWER Racing Reed Valve Kit
- Carbon fibre petals - Quicker valve response and longer wear life under load
- Dual stud spacing compatibility - Fits 40mm and 32mm cylinder studs without extra adapters
- Defined neck dimensions - 0.63 to 0.75 inch neck fits common intake ports
- Optimised for standard pistons - Works well with normal pistons and better with windowed pistons
📋 Technical Details at a Glance
- Display: N/A
- Processor: N/A
- RAM: N/A
- Storage: N/A
- Camera(s): N/A
❓ Frequently Asked Questions
Q: Will this fit my cylinder with 40mm or 32mm studs?
A: Yes, the kit is suitable for cylinders that use 40mm and 32mm stud spacing, so those mounting patterns are supported.
Q: Are small washers included with the reed plate?
A: Four small washers for the steel plate are excluded, so confirm available mounting hardware before installation.
Q: Does performance change with a windowed piston?
A: Performance is better with a windowed piston, while the assembly also works well on normal pistons and cylinders.
🏆 Our Verdict
Suitable for riders upgrading 66cc and 80cc motorised bicycles who want crisper throttle response and more consistent intake control. Carbon fibre petals combined with specific neck dimensions make for measurable improvements in valve response and sealing. A practical aftermarket upgrade that should repay through improved rideability and component durability over time.
