Bottom End (Crankcase, crankshafts, bearings and seals)

Replacement reed petal set with tension plates and hardware. These are compatible with our 22.5cc through 34cc engines. These are not compatible with our 46/47cc reeds. 

Replacement Reed Gasket for Reed Case Engines

This V2 reed valve is an upgrade for any of our reed engines(28.5cc - 34cc) We've added an isolator to keep the carb from heating as well as opened up the volume in the reed to flow more fuel/air improving power. You will see an instant performance gain by simply removing your V1 reed and installing the V2. Two gaskets are included for both sides of the isolator as well as two sets of carb bolts to cover most air filter setups. Reed petals are not included.

Replacement crankcase oil seals for all CY and Zenoah engines 22.5cc's-30.5cc's.

Stock GP460 crankcase that was pulled from a new engine. These have not been used but will have marks from being assembled & disassembled. Bearings and seals are included and assembled as shown in picture. Minor cleaning required before use.

This mount is needed to install an engine into a DBXL or MTXL with our billet crankcase.

<p>This crankcase only fits the Zenoah G320RC/G340RC engine! We've clearanced the inside of the crankcase for a +2mm stroke. You can expect a small gain in performance by just installing this crankcase. We've removed the excess volume from the crankcase to help with throttle response. Transfer bowls have been changed to help with flow and oil holes have been added to prolong crankcase bearing life. Cases come complete with nachi crankcase bearings, snap ring and oil seals installed. Just like our other cases we went with a 3 piece design. If you're ever to crack the fan cover mount it can be replaced by itself instead of having to purchase a complete crankcase. There is not a gasket that seals the two case halves. A good gasket sealant such as threebond 1211 needs to be used.</p>

<p>Dyno results are in.&nbsp;<span>We've had quite a few questions on the power difference between our case and a stock Zenoah case. Testing was done on our prostock g290rc we've been developing. We're seeing by just swapping to the TR/OBR billet piston port case more power</span><span class="text_exposed_show">&nbsp;all the way across the board. 0.2 ft/lbs of torque and HP, broader powerband, +1500 rpm's and quicker crankcase temperature dissipation. You're not going to bolt this case onto a stock engine and turn it into a full mod or anything but you will see a noticeable difference in power.</span></p> <p>After the huge sucess of our reed case's we're proud to announce the release of our billet piston port 4 bolt cases. All excess volume has been pulled from the case to give your engine more power.&nbsp;<span>One of our favorite features is the three piece case design. Over our many years with large scale rc cars, we&rsquo;ve seen our fair share of cracked crankcases. The TR/OBR reed case has a replaceable fan cover mount incase you ever crack or break it. This is a much cheaper alternative to replacing the whole or half case.</span></p> <p>We recommend any displacement Zenoah 4 bolt top end to match this case. RCMK top ends will only fit if the case is opened up or the skirts of the cylinder are turned down. We offer this service by request.</p> <p>Comes complete with bearings and seals installed</p> <p>If you have any stock or ported Zenoah engine this case can be swapped with no modifications. &nbsp;</p> <p>These cases do not use a crankcase gasket. Cases need to be sealed with a good sealant. OBR's sealant of choice is Threebond 1211.&nbsp;</p>

<p>Does not fit G320 or marine/watercool engines.&nbsp;</p> <p>&nbsp;</p> <p>This is a new stock Zenoah 28mm crankshaft. This crankshaft&nbsp;was removed&nbsp;from a stock&nbsp;G290RC engine that was converted to a 30.5cc.&nbsp;</p>

Replacement stainless steel crankcase bearing set from Nachi. Fits all CY and Zenoah engines 22.5cc's-30.5cc's.

OBR balanced crankshaft for G340RC engines. Our cranks are CNC machined before being pressed back together and hand trued. Balance factor is greatly increased over stock and you can expect more power across the board along with a huge drop in vibration. From our testing we see engines with a balanced crank spool up quicker, have more mid range power and rev higher.

All balanced crankshafts have a lead time of 1-2 weeks. If your order is time sensitive please contact us prior to placing your order. 

Complete GP460 bottom end from a new dissembled engine. Complete with bearing, seals and crankshaft. Some cases are sealed and some have been split but are brand new and unused.

OBR balanced crankshaft for 30.5cc engines. Our cranks are CNC machined before being pressed back together and hand trued. Balance factor is greatly increased over stock and you can expect more power across the board along with a huge drop in vibration. From our testing we see engines with a balanced crank spool up quicker, have more mid range power and rev higher.</p> <p></p> <p>All balanced crankshafts have a lead time of about a week. If your order is time sensitive please contact us prior to placing your order to see what the current lead time is.

Replacement stainless steel crankcase bearing set from Nachi. Fits all G320RC and G340RC Engines

Replacement clutch bell and carrier for our piston port and reed 46/47cc engines

<p>+2mm (30mm) Stroker Crankshaft for Zenoah G320RC Engine</p> <p>+2mm aftermarket stroker crankshaft (30mm stroke). For the Zenoah G320RC engine only. Does NOT fit earlier Zenoah RC models!</p>

OBR balanced crankshaft for G320RC engines. Our cranks are CNC machined before being pressed back together and hand trued. Balance factor is greatly increased over stock and you can expect more power across the board along with a huge drop in vibration. From our testing we see engines with a balanced crank spool up quicker, have more mid range power and rev higher.</p> <p></p> <p>All balanced crankshafts have a lead time of about a week. If your order is time sensitive please contact us prior to placing your order to see what the current lead time is.

All G320RC/G340RC reeds are now V2 cases with V2 reed valves. The V2 case has been redesigned to produce more power and eliminate the need for a mesh mod without effecting cooling or air flow. V2 reed valves come with a Delrin isolator to prevent heat transfer from the case to the carb. 

Complete reed case for the G320RC/G340RC engine only!! This case can be bolted up to a stock G320RC but at the minimum the intake port and pulse hole need to be epoxied. To get the full potential out of the case reed porting is required. This case comes complete with hardware, bearings, seals, snap ring, reed block gasket and reed petals/tensioner plates. This case does not use a gasket to seal the two halves and a good gasket sealer such as threebond 1211 is required.

Does not fit G320 or marine/watercool engines. 

This is a brand new CY 2mm stroker crankshaft. This crankshaft needs to be used with a top end that is cut for the +2mm stroke. If not additional cylinder gaskets will need to be used to achieve a proper squish clearance.

<p>Only available for standard rods. Long rods are compatible but will require a cylinder spacer.</p> <p>&nbsp;</p> <p>We are extremely proud to release the TR/OBR 4 bolt reed case. To start, we would like to thank Dave at Turtle Racing and Yamadude for all of their hard work that it took to make this happen! Dave has spent countless hours and late nights designing the many prototypes that we went through making these cases to perfection.</p> <p><span style="color: #ff0000;">Short teaser video</span>&nbsp;<a title="http://youtu.be/kqCpjy2sdlU" href="http://youtu.be/kqCpjy2sdlU" target="_blank">http://youtu.be/kqCpjy2sdlU</a> More video will be available soon.</p> <p>This is not a knock off or slight redesign of any current reed engine. Though there are only so many things that could be changed while still being able to fit into our 1/5^th scale cars, there is a lot more that has gone into these cases than most will realize. Yamadude stepped in to assist and was a huge help with design and flow bench testing. Many prototypes had to be made to achieve the ideal intake track for the best possible flow.</p> <p>&nbsp;</p> <p>Between the help of Dave and Yamadude, that gave us the tools we needed to give you all more power! For those of you not familiar with our history we are coming up on our 10^th year in business. We take a lot of pride in every engine that ships out of the OBR warehouse and we feel this one really reflects what we are capable of building. The development of this case took several months, a lot of labor, testing on our dyno, in-car testing and we could not be more pleased with the final product. We have seen horsepower and torque numbers we never thought possible out of engines this size. We are seeing quite a bit more torque and rpm&rsquo;s as good, if not better than, our piston port long rod engines.&nbsp;</p> <p>&nbsp;</p> <p>In able to offer you a better product, we&rsquo;ve chosen to not use a crankcase gasket. This allows for tighter tolerances and higher reliability when a good sealant such as Yamabond is used.&nbsp;</p> <p>&nbsp;</p> <p>As an option, you may choose to add a TR/OBR sealed clutch housing. When choosing this option, we will install three open crankcase bearings into your reed case. This option also allows for a direct fitment into any HPI Baja or Losi 5-ive T.</p> <p>&nbsp;</p> <p>One of our favorite features is the three piece case design. Over our many years with large scale rc cars, we&rsquo;ve seen our fair share of cracked crankcases. The TR/OBR reed case has a replaceable fan cover mount incase you ever crack or break it. This is a much cheaper alternative to replacing the whole or half case.</p> <p>&nbsp;</p> <p>To top everything off, we&rsquo;ve chosen Boyesen reed petals. We&rsquo;ve also kept in mind that there&rsquo;s more than just HPI&rsquo;s out there. This reed case will fit any HPI Baja, Losi 5-ive T, MCD&rsquo;s, FG&rsquo;s and most other large scale rc cars.</p> <p>&nbsp;</p> <p>This case has been left very versatile. All of you current OBR owners can send in any piston port Zenoah 4 bolt engine to be upgraded. That&rsquo;s right, any four bolt piston port! That covers our Prostock&rsquo;s, full mods and full mod long rods. The ideal engine to send in if you would like to upgrade, is a full mod long rod but any of them will do. If you own a prostock or normal full mod, the cost will be slightly more as you will need the reed case, long rod crankshaft and additional cylinder work to see the full potential of this reed case. Full mod long rod owners will just need the case and cylinder work.</p>

Crankcase snap ring

Brand new GP460 crankshaft removed from an engine. Some may have cosmetic blemishes from assembly/disassembly.

<p>Does not fit marine/watercool engines.&nbsp;</p> <p>&nbsp;</p> <p>This is a new stock Zenoah 28mm crankshaft for the G320RC engines only. &nbsp;This is the stock replacement crankshaft for all of our full mod G320RC engines.</p>