Blow every channel and hole in the carburetor body with compressed air to ensure they are completely clean and clear. I changed the needle with the same float it doesnt seal. NOTE: In this section we will work on a single carburetor at a time. Model Names: F100TR, F100-TR, F-100TR, F100AET, F-100AET, F100-AET Covers USA, Canada and woldwide models. Step 10. LIT-18616-01-66 Service Repair Manual Application: 1997-1998 Yamaha Marine Outboard 20HP (20-HP) & 25HP 25-HP) 10V, 25V, 25V2 2-Stroke Engines. In order to obtain the proper air fuel mixture for all engine speeds, some models have high and low speed jets. Remove the pilot screw and inspect it for pitting or wear, and replace it if necessary. Either the needle or the seat is worn. Model Name: F6AMH, F8CMH, F6MH, F8MH (F6-AMH, F6-MH, F8-AMH, F8-MH). Step 11. You have given me great information. If you cave in Gordon at central florida marine knows that engine very well. If the fuel level is raised and you blow again at the same velocity what happens? A cold powerhead requires a richer fuel mixture to start and during the brief period it is warming to normal operating temperature. Reinstall the pilot jet into the carb, and install a new rubber cap (included in the Yamaha carburetor repair kit) over the pilot jet. Step 11. Just more carbs lol I don't see how you can blow a piston with a carb...unless you pinch an oil line somehow. I'm guessing the new floats and needles are not exact OEM replace and go. The float is the metering device that controls the amount of fuel present in the carburetor's float bowl, which holds the fuel in preparation to its injection into the carburetor for mixing with air, to power the motor. Delivery options and delivery speeds may vary for different locations. I dont get it. Step 9. If there is no fuel in the float bowl then the motor will not be running so what does the float drop mean? Single and two barrel carburetors are fed by a single float and chamber. Never operate your outboard out of the water unless you provide a source of cooling water, whether by connecting a garden hose to the motor's flushing port, connecting a flushing attachment -- sometimes called "earmuffs" because of their resemblance to that winter-wear item -- to a garden hose and placing the "muffs" of the attachment over the cooling water inlets, or immersing the motor in a motor test tub filled with water so that the cooling water inlets are submerged. This manual covers all 15HP 4-Stroke models world wide including USA CANADA. Outdoor Hub, LLC (d/b/a Carbon Media Group), 3290 W. Big Beaver Rd. As the liquid in the column is expelled, an atomized mixture (air and fuel droplets) is created. Is there a way to adjust the floats? Reinstall the float chamber onto the carburetor, followed by the four screws. Reattach the vacuum lines, electrical cables, the fuel line and the oil linkage. As the throttle is advanced to increase powerhead rpm, the fuel and the ignition systems are both advanced equally and at the same rate. LIT-18616-02-97 - 2005-2006 F250 & LF250 F250TR/LF250TR 4-STROKE ENGINE. We’ve got you covered. If it does help good. I was asking a question to verify what I was already doing. A throttle valve controls the flow of air fuel mixture drawn into the combustion chambers. Remove the remaining fuel hose assembly that is still connecting the three carburetors. (I have a 90) The only other adjustement was idle speed located on the throtlle linkage of one carb. This engine is a simple one just like the merc 25. I have a 2001 Yamaha 100hp 4 stroke. On electronically controlled ignition models, a microcomputer decides when to advance or retard the timing based on input from various sensors. Step 3. All the necessary steps to clean and rebuild the carburetor(s) on a Yamaha 90HP outboard motor are listed below. I shook the carb and now it was not. To help free them, apply penetrating oil and let it sit for a few minutes before unscrewing the jets. Model name 90AETO, USA and Canada name 90TR 90C (90-C). (I have a 90). This manual covers all 4HP 4-Stroke models world wide including F4MSHX, F4MLHX, F4AMH, USA CANADA. A choke valve is placed ahead of the metering jets and venture. It was holding. "Yamaha/Mercury/Mariner Outboard Repair Manual 2 - 250 HP 1995-2004"; Seloc Marine; 2007. Each time the carburetor is removed from the ATV, the float level should be checked for adjustment, and reset if necessary. For me, there was no adjustment needed. Float drop down adjustment 12-12-2014, 10:46 PM I took off the carbs to check and adjust. How to Clean & Rebuild Yamaha 90HP Outboard Carburetors. All times are GMT-5. The throat of the carburetor is usually referred to as the barrel. In the rebuild kit there is a little plug that goes in the top of the float needle. Remove the pilot screw and inspect it for pitting or wear, and replace it if necessary. I cleaned mine a while back and was told by a Yamaha mechanic who looked it up in a book he had to set the idle mixture needle valves at 1-1/2 turns from seated as a starting point and adjust from there. A fuel chamber vent hole is located near the top of the carburetor body to permit atmospheric pressure to act against the fuel in each chamber. With this in place it stops the fuel flow when the float goes up. Attach the new float needle valve (included in the carburetor repair kit) to the clip in the float. Thank you all for the help! I think most, myself included, assume your doing this with, Copyright © 2000 - 2020, Outdoor Network LLC. A float valve admits fuel into the reservoir to replace the fuel consumed by the engine. Initial timing and timing advance are both set this way before using a timing light to check the timing. If that doesn't work, use an impact driver to break the screws loose. 8) Slide the … according SM should be... have look on attachment. Timing and synchronization on an outboard engine is extremely important to obtain maximum efficiency. This page was generated at 1 minute ago. Exact Models Covered (Covers All 1996-1997 Models World Wide): F8B (F8-B), F9.9A (F9.9-A), F9.9B (F9.9-B), T9.9U (T9.9-U), F9.9U (F9.9-U), F8BM (F8-BM), F8BEM (F8-BEM), F8BE (F8-BE), T9.9MH (T9.9-MH), T9.9AM (T9.9-AM), FT9.9AMH (FT-9.9-AMH), T9.9EH (T9.9-EH), F9.9AEM (FT9.9-AEM), T9.9ER (T9.9-ER), FT9.9AE (FT9.9-AE), F9.9MH (F9.9-MH), F9.9BM (F9.9-BM), F9.9EH (F9.9-EH), F9.9BEM (F9.9-BEM), F9.9BE (F9.9-BE). In almost all cases, the high-speed circuit has fixed high-speed jets and are not adjustable. Step 1. Watch the Yamaha B90TLRX carburetor clean and rebuild video above, and follow the step-by-step guide below to get this job done. If you work on your outboard motor when your boat is on its trailer, or your motor is on a storage stand, remove the propeller nut with a wrench and slide the thrust hub, propeller and washers from the propeller shaft. At high speed or under heavy duty service, the mixture may change to as much as 12 parts air to 1 part fuel. Spec's allow +/- .5mm. I know because I tested the dissents of travel, shook the carbs without the float cover and they didnt stick open. Item Model Names: E75V, E-75-V, E75-V, E-75V 75AM, 75AEM, 75AE, 75AET, 85AEM, 85AE, 85AET, E75B, E60J, E75MH. On the breaker point ignitions, synchronization is automatic once the point gap and the piston travel or timing mark alignments are correct. The bulb didnt get hard. The diagram illustrates several carburetor basics. Both the measurement and the adjustment are surprisingly straightforward. The throttle cam adjustment cannot be made unless the carburetor throttle shutter is completely closed. I dont know what I did wrong. LIT-18616-02-85 Service Repair Manual Application: 2005-2006 Yamaha Marine Outboard 50HP & 60HP (50-HP, 60-HP) 4-Stroke Engines F50D T50D F60D T60D (F-50-D, T-50-D, F60-D, T60-D). Does anyone know the drop down distance? Model Names: 25JMH, 25MH3, 30DMH, 25JMHO, 30DMHO, 30MH, 25JEHO, 25EH3, 30DWH, 25JEO, 25JETO, 25TR3, 30DEHO, 30EH, 30DMO, 30DE, 30DEO, 30ER, 30DET, 30DETO, 30TR Covers USA, Canada and wold wide models. Install the new float chamber gasket (included in the carburetor repair kit) onto the float chamber. The linkage is held in place by three pop-pins, and can be removed simply by pulling it away from the carbs. LIT-1816-02-59 Service Repair Manual Application: 2004, 2005, 2006 Yamaha Marine Outboard 9.9HP & 15HP (9.9-HP 15-HP) 2-Stroke Engines. He is also a certified marine technician and the author of a popular text on writing local history. 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