Rebuild one original carburetor on your 1977-1979 Kawasaki KZ750B Twin with this aftermarket service kit for the stock Mikuni BS38 carburetor. It replaces common sealing, fuel-control, and mixture-adjustment components that wear, harden, or become damaged during carburetor service.
Key Features
- Aftermarket rebuild kit for one original Mikuni BS38 carburetor
- Includes float bowl gasket and top cover gasket
- Includes #2.0 float needle and seat assembly, #45 pilot jet, #125 main jet, and Y-22 jet needle with retaining clip
- Includes mixture screw, spring, washer, and supplied O-rings
- Sold individually; one kit is required per carburetor
- Two kits are required to rebuild both carburetors on one motorcycle
Fitment / Compatibility
Kawasaki:
- KZ750B Twin - 1977-1979
Buyer Notes
- Order quantity 2 for a complete two-carburetor rebuild.
- Confirm the motorcycle still has its original Mikuni BS38 carburetors before ordering.
- Compare the original jet sizes and needle profile before installation. Previously replaced carburetors or modified intake and exhaust systems may require different jetting or tuning.
Shipping Information
We ship orders daily from our warehouse, and most orders leave either the same day or the next business day after they are placed.
As soon as your order ships, we’ll send you an email with tracking information. You can also log in to your Account page at any time to track packages, review past orders, print invoices, and more.
We offer free ground shipping on all orders over $50 USD to the United States and over $50 CAD to Canada.
Standard delivery typically takes 3 to 7 business days. If you need your order sooner, expedited shipping options are available at checkout.
Orders below the free shipping threshold will have standard shipping charges applied.
Qualifying orders may be combined into a single shipment.
Orders are processed Monday through Friday. We are closed on Saturday and Sunday.
Orders shipping to Alaska, Hawaii, Puerto Rico, APO/FPO addresses, and some Canadian destinations may be subject to standard shipping rates.
Returns
We never charge restocking fees.
Ordered the wrong parts? Sold the bike before you had a chance to install them? Wrong size or wrong color? No problem. We accept returns on unused and unaltered items within 30 days of receipt, excluding electrical parts.
We believe in treating customers fairly and handling returns with a friendly, common-sense approach. When you are reasonable, so are we.
Once we receive and inspect your return, a full refund of the purchase price will be issued. Refunds are processed within 10 business days of receiving the returned item, less any original and/or return shipping charges.
Refunds are issued back to the original payment method used at the time of purchase. Any fees paid for international duties, taxes, and/or brokerage charges are non-refundable.
To exchange an item, simply follow the return steps below. Once your refund has been processed, place a new order for the replacement item or items you need.
All returns must include the original packaging and must be shipped in a proper shipping box.
Return shipments that do not meet all of the above criteria will be refused and returned to sender.
Return Steps
Please email us at helpdesk@oldbikebarn.com with your order number, the part you would like to return, and the reason for the return. We will reply within 1 business day with return authorization and return instructions.
Still have questions? Submit a support ticket through our Contact Us page.