DOG FIGHT RACING DOG FIGHT RACING Bike Chamber Race Parts Home Delivery Bike / Rental Engine maintenance Engine maintenance (tax excluded) 2-stroke E / G 2 cylinders (TZR, NSR, etc.) E / G attachment / detachment From ¥ 36,000 Waist O / H From ¥ 45,000 Full O / H From ¥ 90,000 E / G processing Cylinder detoning process ¥ 25,000 Cylinder re-plating ¥ 35,000 Intake system Carburetor O / H From ¥ 22,500 4-stroke E / G 4-cylinder E / G attachment / detachment From ¥ 30,600 Head O / H From ¥ 112,500 Full O / H From ¥ 166,500 Intake system Carburetor O / H ¥ 22,500 Injection setting ¥ 18,000 * Price does not include tax ―――――――――――――――――――――――――――――――――――――――――――― ▼ Enforcement Example ▼ ① 2st cylinder head detonation ring processing ② 2st cylinder ring processing * The head and cylinder before and after the enforcement example are not the same model. ――――――――――――――――――――――――――――――――――――――――――― At Dogfight Racing, engine maintenance We carefully disassemble, inspect, clean, and replace. Here, we will introduce an excerpt of the contents of engine maintenance carried out in used car production. Please refer to it. I will remove the parts that can be removed before lowering the engine. First, remove the tank and then remove the air cleaner box at the top. There is an air filter inside, and we will check for clogging such as dust and for tears. In the unlikely event that a hole is opened, the amount of air inflow will increase, and the thin state will continue, which may damage the engine in the worst case. Since more than 20 years have passed, there are many vehicles in which the sponge of the air filter has become tattered and it has collapsed, causing clogging. The engine removes the cylinder head from the state where the chamber is removed. At this time, you can easily see the condition of the piston side and cylinder from the exhaust side, but there are many vehicles that already have severe burn-in and exhaust leakage. When you remove the cylinder head, you can see the piston. As you can see in the picture, there is a lot of carbon on the piston. Carbon deposits not only cause abnormal combustion (detonation), but can also damage the cylinder due to changes in compression, so the pistons used so far should be replaced. When you remove the cylinder, the piston connected to the connecting rod will come out. As for the carbon accumulation mentioned earlier, the vertical scratches due to friction with the cylinder are quite severe. The piston ring is also thin, and the exhaust gas blows through under the piston ring and black carbon is attached. Of course, all of them are replaced because the compression will be lost. I will also remove the cylinder of the upper bank. After all, both pistons were worn out according to the mileage. As for the 2-stroke, the piston wears more than the 4-stroke, so it is recommended to check it at an early stage if possible and replace it if necessary. * Race-specification vehicles were replaced after about 500km! If you remove the piston further, you can see the crankshaft inside the crankcase. I will check the final state after breaking the case, but you can see that the crank has already burned considerably from this stage. In this state, if the connecting rod moves loosely or loosely up and down, it is NG. This is a crankshaft leak test. Before lowering the engine, first pour gasoline from the upper cylinder and check that the center seal is removed. If the center seal is removed, the gasoline poured from the upper side will flow out from the lower bank. As you can see, the gasoline flowed out and the center seal of this crank was completely removed and it was out. If the center seal is removed, the cylinders cannot be sealed, and one of them becomes extremely thin and the engine will not start.If the cylinder is running as it is, it may cause engine damage such as seizure. Will also be. This is the removed cylinder head. We will check for detonation and all the plug holes. If it is unusable, we will modify or modify the detonation ring. Of course, if there is damage that cannot be repaired, we will replace it with a new one. Since the plug center of the lower cylinder head of the NSR250R is off-center, detonation is likely to occur, so check it carefully. We will also check the inside of the cylinder. We will check for scratches caused by rubbing against the piston and check the port part. If it is severely scratched or has a large inner diameter, it will be re-plated. In the case of NSR250R, the center rib part of the exhaust port is especially easy to hurt, so check it. Also remove the oil pump and check the operating condition. Be careful when using the NSR oil pump, as the oil seal can easily come off. If there are symptoms such as an increase in T / M gear oil, which causes the 2-stroke oil to decrease quickly without removing the pump, it is suspected that the oil seal has come off. Remove the change arm and drive sprocket, remove the four E / G mounts and link arm, and lower the engine with the carburetor, cylinder, and piston removed. I haven't disengaged the clutch yet. Drain the oil before lowering the E / G, but receive the drained oil in a clean oil pan and check for foreign matter (metal pieces, etc.) inside. Remove the case cover on the clutch side so that you do not forget the knock pin, and then disengage the clutch. For dry clutches, the procedure is to remove the clutch first and then the case cover. We will also inspect the clutches one by one. While checking the burnt and thickness, we will replace the unusable ones. Vehicles with long mileage will be replaced before the clutch starts to slip. Also inspect the outer and housing of the clutch. This vehicle was starting to step and was near the limit. We will also replace it here before it rattles. If there is a step here, the clutch will not disengage smoothly, so it is desirable to replace it before it looks like the picture. The dry clutch wears faster than the wet type, so we check it frequently. After removing the oil pump, remove the mission. Since it is a cassette mission, it can be slipped out as it is. The oil pump bolt is screw-locked, so be careful as it will break if you try to loosen it forcibly. This is the mission I removed. When I thought that it would not come out of the case, the bearing was stuck. I pulled out the bearing because it couldn't be pulled out as it was. After removing the mission, we will also check the shift fork. We will carefully check to prevent mission troubles such as gear loss. For vehicles after 94, replace the shift return SPG with a reinforced type. Is the mission gear chipped or cracked? We will check if it is worn too much. Objects with rounded corners may cause the gear to come off. I will disassemble the crankcase. When you break the case, the crankshaft will come out from inside. When I checked the crankcase, the bearing body rotated and the positioning protrusions hit the case. In the worst case, the case will be replaced if it becomes very terrible. After cleaning cleanly, check the strain. Measure the clearance with a straight edge. It also removes unnecessary burrs from the case. The crank whose center seal has come off will be replaced by ASSY after 1990. 88 and 89 have already been discontinued by the manufacturer, so we will overhaul the crank. Replace all seals and bearings. Replace all bearings in the crankcase. Check the crankshaft runout. If there is runout, perform high-precision centering. Even if it is a new crank, Dogfight Racing will check everything and modify it to improve accuracy. We will inspect the reed valve. We will check the operating condition such as whether the wings are closed tightly and the contact with the base surface, and then wash. Of course, if there is a problem, we will replace it. Next is the carburetor. Vehicles that have not been used for a long time or vehicles that have a long mileage should be checked. I will check all of this vehicle separately. We will check all the holes where gasoline and air flow. Older vehicles and vehicles that have not been used for a long time may be clogged, so this is an important task. Float valves, etc. may be damaged due to steps, etc., so we will replace them with new ones. Check all the holes and jets, and regain the function as a carburetor by soaking in a cleaning solution to remove dirt from fine gasoline and oil that has adhered. Replace all jets that are once clogged and jet needles that are heavily worn with new ones. The carburetor is a precision part in the 1000 minute range. Also check the insulators. There may be cracks due to deterioration over time, in which case secondary air may be sucked in (it may cause seizure, etc.). If there are cracks, we will replace it with a new one. Click here for all of Dogfight Racing's used car production . maintenance Engine maintenance Body maintenance General maintenance Used car production RACING COMPLETE YZF-R6 YZF-R25 online shop online store Chamber Scarf Brake system Step Radiator Other parts by vehicle type Original goods Motorcycle / used car / new car OZ wheel Frequently Asked Questions Store overview Latest information Owner / staff introduction Racing Race schedule / system Race result Rider introduction Takayuki Nakazawa Rider introduction Recruitment of team members Copyright © 2016 DOG FIGHT RACING. All Rights Reserved.