O.S. Speed B2105 .21 Off Road Racing Engine Combo with TB02 EFRA2089 Pipe
- SKU:
- 1EK01
- Brand:
- O.S. Engine
The O.S. Speed B2105 combo set: the B2105 .21 off-road racing engine with the TB02 EFRA2089 tuned silencer and MB01-75 exhaust manifold.
Key Features:
- Factory tuned .21 (3.49cc) engine for 1/8 off-road competition
- Fifth generation of the O.S. Speed B21 series
- Newly designed 3-port cylinder and liner
- DLC-coated crankshaft
- Lighter outer head
- Crankcase from the B2104, with a ceramic rear bearing
- Specially treated thrust plate on the cover plate
- Supplied with the TB02 EFRA2089 tuned silencer and MB01-75 exhaust manifold
What's In The Box?
- (1) O.S. Speed B2105 .21 Engine
- (1) TB02 EFRA2089 (T-2090) Tuned Silencer Assembly
- (1) MB01-75 (M2000SC) Exhaust Manifold Assembly
- (3) Silencer Joint Springs
- (2) Exhaust Header Pipe Springs
- Exhaust Seal Rings
- (1) O.S. T-Series P3 Turbo Glow Plug
- (1) Carburettor Reducer 6II (Red, Aluminium)
- (1) Carburettor Reducer 6.5II (Red, Aluminium)
- (3) Dust Caps (3mm, 16mm, 18mm)
Required for Operation (Not Included)
- Glow fuel for model two-stroke engines
- Glowplug igniter
- Starter box
- Fuel filter
- Fuel pump or squeeze bottle
Overview
The O.S. Speed B2105 is a factory tuned engine for 1/8 off-road competition and the fifth generation of the O.S. Speed B21 series. The cylinder liner and crankshaft were redesigned for smooth, linear power delivery, and a lighter outer head improves drivability. This combo set adds the TB02 EFRA2089 tuned silencer and MB01-75 exhaust manifold.
O.S. recommend the 6II carburettor reducer for a buggy and the 6.5II for a truggy, and a muffler-pressurised fuel feed system. The running-in procedure in the O.S. manual is written for fuel containing 30% nitromethane.
The newly designed cylinder and liner use 3 ports. The port shape has been changed and the air-fuel mixture flow revised for more torque from the mid range to the top end.
The crankshaft carries O.S. Speed's DLC coating, and its internal shape has been revised for better power characteristics and easier use than the B2104.
A lighter outer head improves drivability.
The crankcase is carried over from the B2104, with a ceramic bearing inside.
A specially treated thrust plate on the cover plate reduces wear from friction between the rotating connecting rod and the cover plate, improving engine life.
Technical Specifications:
| Engine | O.S. Speed B2105 |
| Displacement | 3.49cc (0.213 cu in) |
| Bore | 16.27mm (0.641 in) |
| Stroke | 16.80mm (0.661 in) |
| Output | 2.68ps (2.64hp) at 34,000rpm |
| Practical RPM Range | 4,000 - 42,000rpm |
| Engine Weight | 348g (12.28oz) |
| Liner Ports | 3 |
| Carburettor | Type 22E2(B) |
| Rear Bearing | Ceramic |
| Crankshaft Thread | UNF 1/4-28 |
| Glow Plug | O.S. T-Series P3 (Turbo) |
| Tuned Silencer | TB02 EFRA2089 (T-2090SC) |
| Exhaust Manifold | MB01-75 (M2000SC) |
| Recommended Mounting Screws | 3mm or 4-40 steel socket head |
| Application | 1/8 Off Road Buggy and Truggy |
| O.S. Part Number | 1EK01 (engine only: 1EK00) |
Shipping
$13.50 Flat Rate - Nationwide!
Saturday Delivery
Unfortunately Saturday delivery is no longer available at RC Hobbies.
Delivery
Once RC Hobbies has confirmed acceptance of the buyer's order, we will endeavor to dispatch the buyer's order within
1-3 Business days unless a different time frame is specified in relation to a particular product. If we are unable to dispatch
the buyer's order within the time frame specified by RC Hobbies we will endeavor to contact the buyer and advise
the buyer of the expected dispatch date.
In stock items are generally dispatched on the same day you place your order, unless a different time frame is specified
in relation to a particular product and provided the order was placed before our daily cut off time which is usually
around 1PM.
We use NZ Post, Aramex, and Post Haste for New Zealand orders. Deliveries are usually 2 working days, but please allow an extra
day for big parcels to reach the South Island and for rural deliveries.
We use NZ Post for orders that can fit into overnight courier bags and Post Haste for larger parcels.
Tracking emails will be sent out once parcels have been collected.
The buyer may specify delivery instructions for an order (for example, the buyer may authorise the delivery agent to
leave the products in a specified location if the buyer will not be at the delivery address). RC Hobbies will
not be responsible for any order that is delivered in accordance with the buyer’s delivery instructions.
Delivery to PO Boxes
RC Hobbies can send goods to PO Boxes, except for large freight boxes.
International Delivery.
We're based in New Zealand but we deliver all round the world. Please use our shipping estimator at checkoutfor a shipping quote or contact us and will send you
a quote.
sales@rchobbies.co.nz
Returns Policy
The item I received is not the item I ordered
Provided the item is unopened and in mint condition we’ll replace the item. To receive your replacement you must return the
original item to. You will be provided with a no-cost return addressed courier satchel (or similar)
and we will process your replacement within 1–3 days of receiving your item.
The item I ordered arrived faulty.
Please arrange with RC Hobbies to return the item for testing. If we confirm that the item was damaged before leaving
RC Hobbies, or was faulty out of the box, your item will be repaired or if it cannot be repaired then it will be replaced
by RC Hobbies Ltd free of charge. If the goods are faulty we will meet our obligations under the Consumers Guarantees
Act to provide a remedy.
The item I ordered did not arrive
If your item did not arrive the first thing to do is request a “track and trace” on your item from the Courier Post or Fastway
tracking emails we send out.
Alternatively you can call Courier Post on
0800 268 743 or Post Haste on
09 444 2950
If the “track and trace” on your order indicates that it has been delivered, but you’re unable to find it or it hasn’t been
delivered within the timeframe we will start an investigation with Courier Post & Post Haste on your behalf.
Regrettably, neither RC Hobbies nor Courier Post & Fastway are able to refund or replace items that have been lost, damaged
or stolen after being delivered to your property. If you are concerned about leaving your items unattended we recommend
using “Signature Required” option which is our default option unless advise by the Buyer to use the “No Signature Required”
option.
I've changed my mind and no longer want the item I ordered
Change of mind returns can be processed as long as it has been agreed by RC Hobbies and the item has been returned
within 7 days of dispatch and is unopened and in mint condition. The shipping for the return will also be at the cost
of the buyer. Once we have the item in hand we will assess the item and if everything checks out OK you will receive
a Store Credit or refund less the restock fee and freight charges.
Restock fee
All goods ordered in error by the Customer or goods the Customer wishes to return are subject to a restock fee. The fee is
15% of the goods sales value. This applies if you change your mind, ordered it in error, unwanted Gift or just did not
like it or did not suit you, so please choose carefully and read the descriptions in the listings as some products also
require additional items to complete.
Description
The O.S. Speed B2105 combo set: the B2105 .21 off-road racing engine with the TB02 EFRA2089 tuned silencer and MB01-75 exhaust manifold.
Key Features:
- Factory tuned .21 (3.49cc) engine for 1/8 off-road competition
- Fifth generation of the O.S. Speed B21 series
- Newly designed 3-port cylinder and liner
- DLC-coated crankshaft
- Lighter outer head
- Crankcase from the B2104, with a ceramic rear bearing
- Specially treated thrust plate on the cover plate
- Supplied with the TB02 EFRA2089 tuned silencer and MB01-75 exhaust manifold
What's In The Box?
- (1) O.S. Speed B2105 .21 Engine
- (1) TB02 EFRA2089 (T-2090) Tuned Silencer Assembly
- (1) MB01-75 (M2000SC) Exhaust Manifold Assembly
- (3) Silencer Joint Springs
- (2) Exhaust Header Pipe Springs
- Exhaust Seal Rings
- (1) O.S. T-Series P3 Turbo Glow Plug
- (1) Carburettor Reducer 6II (Red, Aluminium)
- (1) Carburettor Reducer 6.5II (Red, Aluminium)
- (3) Dust Caps (3mm, 16mm, 18mm)
Required for Operation (Not Included)
- Glow fuel for model two-stroke engines
- Glowplug igniter
- Starter box
- Fuel filter
- Fuel pump or squeeze bottle
Overview
The O.S. Speed B2105 is a factory tuned engine for 1/8 off-road competition and the fifth generation of the O.S. Speed B21 series. The cylinder liner and crankshaft were redesigned for smooth, linear power delivery, and a lighter outer head improves drivability. This combo set adds the TB02 EFRA2089 tuned silencer and MB01-75 exhaust manifold.
O.S. recommend the 6II carburettor reducer for a buggy and the 6.5II for a truggy, and a muffler-pressurised fuel feed system. The running-in procedure in the O.S. manual is written for fuel containing 30% nitromethane.
The newly designed cylinder and liner use 3 ports. The port shape has been changed and the air-fuel mixture flow revised for more torque from the mid range to the top end.
The crankshaft carries O.S. Speed's DLC coating, and its internal shape has been revised for better power characteristics and easier use than the B2104.
A lighter outer head improves drivability.
The crankcase is carried over from the B2104, with a ceramic bearing inside.
A specially treated thrust plate on the cover plate reduces wear from friction between the rotating connecting rod and the cover plate, improving engine life.
Technical Specifications:
| Engine | O.S. Speed B2105 |
| Displacement | 3.49cc (0.213 cu in) |
| Bore | 16.27mm (0.641 in) |
| Stroke | 16.80mm (0.661 in) |
| Output | 2.68ps (2.64hp) at 34,000rpm |
| Practical RPM Range | 4,000 - 42,000rpm |
| Engine Weight | 348g (12.28oz) |
| Liner Ports | 3 |
| Carburettor | Type 22E2(B) |
| Rear Bearing | Ceramic |
| Crankshaft Thread | UNF 1/4-28 |
| Glow Plug | O.S. T-Series P3 (Turbo) |
| Tuned Silencer | TB02 EFRA2089 (T-2090SC) |
| Exhaust Manifold | MB01-75 (M2000SC) |
| Recommended Mounting Screws | 3mm or 4-40 steel socket head |
| Application | 1/8 Off Road Buggy and Truggy |
| O.S. Part Number | 1EK01 (engine only: 1EK00) |
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Shipping & Returns
Shipping
$13.50 Flat Rate -Nationwide!
Delivery
Once E&E TRADERS LTD has confirmed acceptance of the buyer's order, we will endeavor to dispatch the buyer's order within
24 Hours unless a different time frame is specified in relation to a particular product. If we are unable to dispatch
the buyer's order within the time frame specified by E&E TRADERS LTD we will endeavor to contact the buyer and advise
the buyer of the expected dispatch date.
In stock items are generally dispatched on the following business day, unless a different time frame is specified
in relation to a particular product and provided the order was placed before our daily cut off time which is usually
around 1PM - 2PM.
We use Courier Post and Fastway for New Zealand orders. Deliveries are usually overnight, but please allow an extra
day for big parcels to reach the South Island and for rural deliveries.
We use Courier Post for orders that can fit into overnight courier bags and Fastway for larger parcels.
Tracking emails will be sent out once parcels have been collected.
The buyer may specify delivery instructions for an order (for example, the buyer may authorise the delivery agent to
leave the products in a specified location if the buyer will not be at the delivery address). RC Hobbies 12 Ltd will
not be responsible for any order that is delivered in accordance with the buyer’s delivery instructions.
Delivery to PO Boxes
E & E TRADERS LTD can send goods to PO Boxes
International Delivery.
We're based in New Zealand but we deliver all round the world. Please contact us for a shipping quote or we will send you
a quote after your order has been placed.
sales@rchobbies.co.nz
Returns Policy
The item I received is not the item I ordered
Provided the item is unopened and in mint condition we’ll replace the item. To receive your replacement you must return the
original item to E & E TRADERS LTD. You will be provided with a no-cost return addressed courier satchel (or similar) and
we will process your replacement within 1–3 days of receiving your item.
The item I ordered arrived faulty.
Please arrange with E & E TRADERS LTD to return the item for testing. If we confirm that the item was damaged before leaving
RC Hobbies, or was faulty out of the box, your item will be repaired or if it cannot be repaired then it will be replaced
by E & E TRADERS LTD free of charge. If the goods are faulty we will meet our obligations under the Consumers Guarantees
Act to provide a remedy.
The item I ordered did not arrive
If your item did not arrive the first thing to do is request a “track and trace” on your item from the Courier Post or Fastway tracking emails we send out.
Alternatively you can call Courier Post on 0800 268 743 or Fastway on 09 634 3704
If the “track and trace” on your order indicates that it has been delivered, but you’re unable to find it or it hasn’t been
delivered within the timeframe we will start an investigation with Courier Post & PostHaste on your behalf.
Regrettably, neither RC Hobbies nor Courier Post & PostHaste are able to refund or replace items that have been lost, damaged or stolen
after being delivered to your property. If you are concerned about leaving your items unattended we recommend using “Signature
Required” option which is our default option unless advise by the Buyer to use the “No Signature Required” option.
I've changed my mind and no longer want the item I ordered
Change of mind returns can be processed as long as it has been agreed by E & E TRADERS LTD and the item has been returned
within 7 days of dispatch and is unopened and in mint condition. The shipping for the return will also be at the cost of
the buyer. Once we have the item in hand we will assess the item and if everything checks out OK you will receive a Store
Credit or refund less the restock fee and freight charges.
Restock fee
All goods ordered in error by the Customer or goods the Customer wishes to return are subject to a restock fee. The fee is
10% of the goods sales value. This applies if you change your mind, ordered it in error, unwanted Gift or just did not like
it or did not suit you, so please choose carefully and read the descriptions in the listings as some products also require
additional items to complete.
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