Street Bike Heads and Parts
Street Bike Heads & Parts at JJ Motorsports
Upgrade and maintain your street bike's cylinder heads with premium heads and parts from JJ Motorsports. Our selection includes block-off plates, valve head kits, and accessories designed for improved airflow, weight reduction, and precise tuning on the road or track. Compatible with Honda Grom, Yamaha, Kawasaki, Suzuki, and more, these components feature CNC-machined aluminum, stainless steel valves, and forged designs to enhance power, torque, sealing, and durability for sportbikes, cruisers, or daily commuters. Built for easy installation and closed-course use, they ensure optimal engine performance, accurate dyno readings, and long-lasting reliability for DIY mechanics or professional shops.
Shop trusted brands like Powerstands Racing for block-off plates and Koso North America for valve kits. Explore related categories such as street bike valves & parts for more components or street bike engine gaskets & kits for sealing solutions.
Top Street Bike Heads & Parts Products
- POWERSTANDS RACING Block Off Plate - Black 03-01350-22 – CNC-machined aluminum for removing excess weight, safely sealing air injection ports, and accurate dyno air-to-fuel measurements; closed-course use only.
- POWERSTANDS RACING Block Off Plate - Black 01-01350-22 – Billet aluminum construction blocks air injection ports, reduces weight, and enables precise tuning; ideal for closed-course applications.
- KOSO NORTH AMERICA Valve Head Kit - Grom MC623000 – Four-valve design with forged piston and stainless steel valves (24 mm intake, 20 mm exhaust) for increased airflow, power, and torque; complements big bore kits.
Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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POWERSTANDS RACING Block Off Plate - Black 00-01351-22
POWERSTANDS RACING
$44.95If you're serious about tuning, excess emissions equipment is dead weight holding back your power numbers. The POWERSTANDS Racing Block Off Plate eliminates this parasitic drag and seals off air injection ports, giving you cleaner dyno data and more...09300079- SKU:
- 09300079
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- BLOCK OFF PLATE
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$44.95 -
POWERSTANDS RACING Block Off Plate - Black 03-01350-22
POWERSTANDS RACING
$44.95If you're serious about dyno tuning or racing applications, unnecessary air injection systems add dead weight and complicate your air-to-fuel ratio measurements. The POWERSTANDS Racing Block Off Plate eliminates this equipment with a precision...09300080- SKU:
- 09300080
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- BLOCK OFF PLATE
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
$44.95Qty in Cart: 0Quantity:Price:$44.95Subtotal: -
POWERSTANDS RACING Block Off Plate - Black 02-01350-22
POWERSTANDS RACING
$44.95If you're serious about dyno tuning or weight reduction on your race platform, eliminating unnecessary air injection systems is a straightforward way to tighten your setup. This CNC-machined aluminum block-off plate seals off factory air injection ports...09300112- SKU:
- 09300112
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
- UNITS:
- SET
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- BLOCK OFF PLATE
$44.95 -
POWERSTANDS RACING Block Off Plate - Black 07-01351-22
POWERSTANDS RACING
$44.95If you're serious about extracting every ounce of performance from your engine, unnecessary weight and parasitic systems are working against you. This CNC-machined block-off plate from POWERSTANDS Racing eliminates air injection ports while maintaining a...09300117- SKU:
- 09300117
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- BLOCK OFF PLATE
- UNITS:
- SET
- COLOR/FINISH:
- BLACK
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$44.95 -
On Sale
POWERSTANDS RACING Block-Off Plate - Black 04-01354-22
POWERSTANDS RACING
MSRP: $44.95Now: $29.00Was: $44.95Every pound matters on the track. Removing unnecessary equipment weight directly improves acceleration, braking performance, and overall handling dynamics. The POWERSTANDS Racing Block-Off Plate is a CNC-machined aluminum solution that eliminates excess...09300178- SKU:
- 09300178
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- BLOCK OFF PLATE
- TYPE:
- AIR INJECTION
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
MSRP: $44.95Now: $29.00Was: $44.95Qty in Cart: 0Quantity:Price:MSRP: $44.95Now: $29.00Was: $44.95Subtotal: -
POWERSTANDS RACING Block Off Plate - Black 03-01354-22
POWERSTANDS RACING
$44.95If you're optimizing your engine for the dyno or shedding unnecessary weight on a dedicated race platform, block-off plates are non-negotiable. POWERSTANDS Racing's CNC-machined aluminum design eliminates air injection ports with precision, giving you...09300146- SKU:
- 09300146
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- UNITS:
- SET
- COLOR/FINISH:
- BLACK
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- BLOCK OFF PLATE
$44.95 -
POWERSTANDS RACING Block Off Plate - Black 07-01353-22
POWERSTANDS RACING
$44.95If you're serious about dyno tuning or reducing parasitic weight on a closed-course vehicle, eliminating unnecessary air injection systems is a straightforward way to improve efficiency and get cleaner fuel mapping data. The POWERSTANDS Racing Block Off...09300151- SKU:
- 09300151
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PRODUCT NAME:
- BLOCK OFF PLATE
$44.95 -
POWERSTANDS RACING Block Off Plate - Black 07-01354-22
POWERSTANDS RACING
$44.95Eliminating unnecessary equipment weight is critical for optimizing power-to-weight ratio on the track. These CNC-machined block-off plates seal off factory air injection ports while delivering accurate air-to-fuel ratio readings on the dyno—essential...09300152- SKU:
- 09300152
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- BLOCK OFF PLATE
- UNITS:
- SET
$44.95 -
POWERSTANDS RACING Block Off Plate - Black 01-01350-22
POWERSTANDS RACING
$123.95Eliminating parasitic weight and sealing off unused air injection ports directly improves your power-to-weight ratio and simplifies fuel mapping on the dyno. This CNC-machined block-off plate delivers the precision fit and material quality that serious...09300096- SKU:
- 09300096
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- BLOCK OFF PLATE
- UNITS:
- SET
$123.95 -
POWERSTANDS RACING Block Off Plate - Black 09-01350-22
POWERSTANDS RACING
$44.95Eliminating unnecessary air injection systems reduces weight and simplifies your fuel mapping strategy on the dyno. This CNC-machined block-off plate seals off air ports cleanly while allowing you to achieve precise air-to-fuel ratio measurements without...09300097- SKU:
- 09300097
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- UNITS:
- SET
- PRODUCT NAME:
- BLOCK OFF PLATE
$44.95 -
POWERSTANDS RACING Block Off Plate - Black 04-01351-22
POWERSTANDS RACING
$44.95If you're serious about dyno tuning or weight reduction on a closed-course vehicle, air injection systems are dead weight holding back your performance numbers. The POWERSTANDS Racing Block Off Plate eliminates parasitic drag from factory air injection...09300098- SKU:
- 09300098
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- BLOCK OFF PLATE
- COLOR/FINISH:
- BLACK
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- SET
$44.95 -
POWERSTANDS RACING Block Off Plate - Black 06-01350-22
POWERSTANDS RACING
$44.95If you're serious about optimizing your engine's performance on the dyno, eliminating unnecessary weight and parasitic losses is non-negotiable. This CNC-machined block-off plate safely seals your air injection ports, giving you accurate air-to-fuel...09300100- SKU:
- 09300100
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- BLOCK OFF PLATE
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- UNITS:
- SET
- COLOR/FINISH:
- BLACK
$44.95Qty in Cart: 0Quantity:Price:$44.95Subtotal: -
KOSO NORTH AMERICA Valve Head Kit - Grom MC623000
KOSO NORTH AMERICA
$937.95If you're running a big bore kit on your Grom, this valve head kit is essential to unlock the full potential of your displacement gains. The unique four-valve design dramatically improves cylinder head flow dynamics, translating directly to measurable...09500755- SKU:
- 09500755
- Availability:
- Ships Same Business Day
- Weight:
- 6.61 LBS
- PRODUCT NAME:
- CYLINDER HEAD KIT
- UNITS:
- KIT
- TYPE:
- 4 VALVE
- FEATURES:
- HEAD KIT ONLY
- RIDING STYLE:
- STREET
- MATERIAL:
- STAINLESS STEEL
$937.95Qty in Cart: 0Quantity:Price:$937.95Subtotal: -
BARON Air Injection Kit BA-2561-00
BARON
$31.95A clean engine bay starts with eliminating unnecessary vacuum lines and emissions hoses that clutter your intake manifold. The BARON Air Injection Kit BA-2561-00 removes these unsightly components while maintaining emissions compliance—no carb or fuel...09300054- SKU:
- 09300054
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- REMOVAL KIT
- UNITS:
- KIT
$31.95Qty in Cart: 0Quantity:Price:$31.95Subtotal: -
BARON Air Injection Kit BA-2571-00
BARON
$31.95The BARON Air Injection Kit BA-2571-00 eliminates the maze of vacuum hoses and secondary air lines that clutter your engine bay, giving you a factory-clean appearance without sacrificing emissions compliance. This bolt-on system reduces backfire while...09300055- SKU:
- 09300055
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- PRODUCT NAME:
- REMOVAL KIT
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$31.95 -
BARON Air Injection Kit BA-2521-00
BARON
$31.95If you're running a carbureted or fuel-injected engine, air injection systems are essential for emissions compliance—but they don't have to clutter your engine bay. The BARON BA-2521-00 eliminates those unsightly lines and hoses while maintaining full...09300053- SKU:
- 09300053
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- REMOVAL KIT
- UNITS:
- KIT
$31.95 -
DRIVEN RACING Block Off Plate - Yamaha DSBLOCK-21
DRIVEN RACING
$35.99If you're serious about dyno tuning your Yamaha, you need accurate baseline conditions—and that means eliminating air leaks that skew your results. The DRIVEN RACING Block Off Plate seals unwanted passages in your airbox, giving you repeatable,...09300126- SKU:
- 09300126
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- COLOR/FINISH:
- ANODIZED
- PRODUCT NAME:
- BLOCK OFF PLATE
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
- MATERIAL:
- 6061 T6 ALUMINUM
- UNITS:
- SET
$35.99 -
DRIVEN RACING Block Off Plate - Suzuki DSBLOCK-17
DRIVEN RACING
$47.99If you're serious about dyno tuning your Suzuki, you need precise control over your airbox configuration—and this block off plate gives you exactly that. By sealing unwanted air leaks, you eliminate variables that skew your baseline readings and make...09300109- SKU:
- 09300109
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- ANODIZED
- PRODUCT NAME:
- BLOCK OFF PLATE
- MATERIAL:
- 6061 T6 ALUMINUM
- UNITS:
- SET
$47.99 -
DRIVEN RACING Block Off Plate - Kawasaki DSBLOCK-25
DRIVEN RACING
$47.99If you're serious about dyno tuning your Kawasaki, air leaks will sabotage your baseline readings and cost you real horsepower. The DRIVEN Racing Block Off Plate eliminates unwanted intake air bypasses, giving you the accurate, repeatable data you need...09300156- SKU:
- 09300156
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- MATERIAL:
- 6061 T6 ALUMINUM
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- BLOCK OFF PLATE
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- ANODIZED
$47.99 -
DRIVEN RACING Block Off Plate - Honda DSBLOCK-18
DRIVEN RACING
$47.99If you're serious about dyno tuning your Honda, you need accurate air intake control—and guesswork won't cut it. The DRIVEN RACING Block Off Plate eliminates variable air leaks that skew your tuning results, giving you repeatable, precise data for every...09300111- SKU:
- 09300111
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- ANODIZED
- PRODUCT NAME:
- BLOCK OFF PLATE
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- BLACK
- MATERIAL:
- 6061 T6 ALUMINUM
- UNITS:
- SET
$47.99Qty in Cart: 0Quantity:Price:$47.99Subtotal:
