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The Yamaha TT-R 90 E was a single-cylinder, four-stroke motorcycle produced by Yamaha between 2002 and 2007. The 2004 TT-R 90 came in both a kick start only and an electric start version. This paragraph will discuss the steps to electric start the 2004 Yamaha TT-R 90.
| Characteristics | Values |
|---|---|
| Engine | Single cylinder, four-stroke |
| Max torque | 4.5 ft/lbs (6.1 Nm) @ 4000 RPM |
| Claimed horsepower | 5.36 HP (4.0 KW) @ 7000 RPM |
| Bore and stroke | 47.0mm bore x 51.8mm stroke |
| Displacement | 89.0 cubic centimeters |
| Fuel supply | Single overhead cams (sohc) |
| Transmission | 3-speed |
| Power moderation | Wet, multiple-disc and centrifugal automatic |
| Tires | 2.50-14 front tire and a 3.00-12 rear tire |
| Starting | Electric start and kick start |
| Cooling | Air-cooled |
| Ignition | CDI |
| Fuel | Gas |
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What You'll Learn
Check the wiring, CDI, plug cap, and igniter
To check the wiring, CDI, plug cap, and igniter on a 2004 TTR 90, follow these steps:
Firstly, check the wiring. Ensure that all the wires are attached and functioning, especially the ground wires. Start at one end and move forward, checking each wire as you go.
Next, check the CDI (Capacitor Discharge Ignition) unit. The CDI box is typically located under the seat and controls the ignition system. You can test the CDI unit by using a multimeter to measure resistance. Pin up the positive probe of the multimeter to the wire of the specified colour, and the negative probe to the cable of the corresponding colour. Then, check the resistance value. You can also check the connection between the CDI unit and the ignition coil by measuring the resistance between the specified cables.
Now, check the plug cap. Ensure that it is clean and dry, and that the spark plug is receiving power. If the spark plug is not firing, try replacing it.
Finally, check the igniter. If the wiring, CDI, and plug cap are all functioning properly, and the engine still won't start, it could be an issue with the igniter or an electrical problem. Use a test light to check if the coil is receiving a pulse. With the test light on the negative terminal, crank the engine and observe if the light flashes. If there is no flash, it indicates an issue with the electrical signal to the coil.
By following these steps, you can systematically check the wiring, CDI, plug cap, and igniter on your 2004 TTR 90 and identify any potential issues affecting the starting process.
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Drain the card float bowl and check for a foul odour
To drain the carb float bowl on a 2004 TTR 90, locate the screw on the lower side of the bowl. Remove this screw and allow the fuel to drain out. Once the fuel has drained completely, replace the screw.
Now, check for any foul odours. If there is a strong smell of fuel, this could indicate a leak. A sweet smell could indicate that coolant is leaking into the oil. A burnt smell could be a sign of an overheated engine, or that the clutch or brakes are slipping.
If there is no unusual odour, the next step is to clean the carb float bowl. To do this, remove the float bowl and spray the entire carb with a carb cleaner from an auto parts store. Be sure to wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings, as well as the screw holes.
Finally, put the float bowl back together, ensuring that the bolts are tight. Reinstall the carb and let the float bowl fill before starting the engine.
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Remove the spark plug and check if it's wet
To check if your 2004 TTR 90's spark plug is wet, you will first need to remove it. The spark plug for a Yamaha TTR 90 is located in the engine.
Before you begin, ensure that you have the correct spark plug for your vehicle by checking your owner's manual. You should also examine the spark plug for any signs of damage. Look at the end of the spark plug that was in the cylinder and inspect it for any blisters on the insulator tip, melted electrodes, or white deposits, which are signs of a burned spark plug. If the electrodes are worn and eroded, this means the spark plug needs to be replaced.
Once you have located the spark plug, you can remove it by hand. Take the spark plug in your hand and begin looking at it for signs of damage. If the spark plug is wet, this could be the result of engine flooding, which happens when you try to start the engine several times without success.
If the spark plug is wet, you can either clean it and wait for it to dry out, or you can replace it with a new one. Getting the water out is a priority, as leaving it in can cause extensive damage to your engine. You can try to get the water out by removing all the spark plugs and trying to use the starter to see if the engine will spin over—the compression should blow the water out.
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Clean and dry the spark plug, then replace
To clean and dry a spark plug, start by disconnecting the negative cable from your vehicle's battery. Next, locate the spark plug covers, also known as boots, on top of your engine. There should be 4-6 of them. Slide out the cables from each boot and wipe the surface with a clean, dry cloth to remove dust and debris. Spray compressed air over the area to blow away any remaining grime. Pull out the first boot, then use a socket wrench with an extension to rotate counterclockwise and loosen the spark plug. Once it's loose, pull the spark plug out with the socket wrench.
Now that the spark plug is out, you can clean it. A popular method for cleaning spark plugs is with a lighter or blow torch. Grip the spark plug with pliers and pass the flame over the electrode. Only keep the flame on the spark plug for a couple of seconds at a time to avoid damaging it. Repeat until the contaminant is burnt away, then let it cool and wipe the electrodes. Alternatively, you can use sandpaper to gently scrape the electrode until it looks like bare metal.
Once the spark plug is clean and dry, you can replace it. Thread the spark plug back into the engine by hand, then follow up with a wrench for final tightening. Push the spark plug wire down over the end of the spark plug. Rotate the rubber boot in both directions to ensure a secure connection. Finally, replace any coverings you removed earlier.
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Spray WD-40 into the carb opening
If your 2004 TTR 90 won't start, there are a few things you can try. Firstly, check that you have gas and spark, and if the plug gets wet, you could try a pressure pak starter. If that doesn't work, the next step is to remove the spark plug, clean and dry it, then replace it. Next, remove the air filter.
Now we get to the WD-40: spray a one-second blast of WD-40 into the carb opening. Turn over the engine (pull the handle). If the engine starts briefly and runs for three seconds, you know you don't have a spark plug issue, but rather a dirty carb. You can buy a rebuild kit for this from the manufacturer.
If the engine doesn't start, you're not getting a spark to the spark plug. In this case, you may need to try a different solution, such as cleaning the carb with a dedicated carb cleaner, or adjusting the carb.
Note: WD-40 is not suitable for use on silicon-filled cranks.
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Frequently asked questions
The Yamaha TT-R 90 is a single-cylinder, four-stroke motorcycle produced by Yamaha between 2002 and 2007. It came in both a kick start only and an electric start version.
The electric start version of the Yamaha TT-R 90 is known as the TT-R90E. The E suffix indicates the presence of electric starting.
Ensure that you have gas and spark. If the plug gets wet, you may need to use a pressure pak starter (ether).
Check each component of the ignition system, including the wiring, coil, and igniter. If the issue persists, it could be an electrical problem or a lack of signal/pulse to the coil.
Yes, there are a few Yamaha TT-R 90 electric start motorcycles available for sale online. These motorcycles are typically advertised as being well-maintained, with normal wear and tear.
