Question about 2008 Yamaha Aerox R

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2008 Yamaha Aerox R no power - 2008 Yamaha Aerox R

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  • Yamaha Master
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Hi, Adam_greenha there are few things you need to look at when trying to troubleshoot your scooter for power loss. How does it sound? If you run it wide open throttle when warmed up, does it peak out? or stutter? is it loud, or very quite the symptoms can help decide what to try. When you are going full throttle, the engine should get to a high RPM and sound smooth here are a few things you should look for:
1. Plugging air intake- will start well cold, but be hard to warm up and not reach top speed. The engine will stutter at high RPM.
2. Open air intake- to much air or air cleaner is disconnected- engine will not have power at high speed, make vacuum cleaner sound. Acts like it's running out of gas. ( sounds almost the same as a dirty carburetor.)
3. Plugged exhaust port the engine sounds and runs good, but has no power. Slow to take off. Same as plugged muffler, but if the muffler is plugged you get a very smooth exhaust note at idle. Humming instead of pop pop pop pop.
4. Fouled spark plug- backfire. If you get backfire, pretty good chance the plug is fouled.
5. On models with belts, the gear ratio drops as the belt gets thinner (most hondas have belts).
6. On a moped with high mileage, the belt will cause slow top end speed if worn thin.
7. If you have a bike with chain drive in an oil bath and you "OVERFILL" the oil amount in the chaincase, that makes for slow running as it requires too much power to turn the oil.
8. If your engine does not rev up well and stutters or sputters, like when it is cold with the choke on, the engine is running too rich. (too much fuel).
9. Is the air filter soaked with oil? Clean with soap and water!
10. Is the air opening in the airbox plugged? Very common for a spider or mud wasp to build a nest in one of the intake holes.
11. On some scooters it is common to get a leaf stuck in the intake port of the airbox, causing a 10mph drop in top speed.
12. Don't try to adjust the screws on the side of the carb to get lean or rich, as they are for the idle circuit only.
13. The idle air screw should be about 1 1/2 turns out on most scooters.
14. Say your engine revs but kind of wheezes or acts like it runs out of gas it is common to have a buildup of hard carbon on the inside diameter of the hole in the main and pilot jets, and it must be carefully removed.
15. If your moped does not idle the pilot jet is likely plugged.
16. Anytime a moped has not been used for 1 year or more, and still has the same fuel in it, good chance you will need to clean the jets.
17. The poor quality of today's gasoline has made this a rather steady bet.
18. Mopeds are affected more than most vehicles because the small size hole the jet requires is easily plugged, even by thick oily fuel, or water.
19. Drain your carb once in awhile! Most have a screw of some type at the bottom (where the drain needs to be) of the carb.
20. Make sure the air boot to the airbox is not on wrong, kinked, hard and shrunken.
21. Don't oil the air filter if you got the stutters.
22. On some scooters, you can leave one snap loose on the airbox lid to allow it to crack open, to get full rpm.
23. "WARNING" too much lean out on the gas, and since the fuel cools the piston, the piston can "MELT"
24. Still slow? Check the muffler tip. Make sure no carbon buildup is inside the tip, stick something in as far as it will go.
25. Common on some scooters to have the tip bent over on a curb, then carbon up solid. common of all types to have the whole muffler plug.
26. When you have the muffler off, is it heavy?
27. Can you get the baffle out to see if the holes are plugged?
28. Check the exhaust port on the cylinder.
29. If you can't see all the way into the piston, use a mirror and a flashlight to make sure the piston is ok and the port is not plugged where it meets the piston.
30. Common on all models to plug here, Just scrape it out so the hole is full size again.
31. Don't worry about the small film on the inside of the port, I am talking about a very thin film that forms a wall in the exhaust port right next to the piston.
32. A 1 1/2 inch hole can be reduced to the size of a pea...... With a thin film of carbon.
33. If you can see the piston ok, it's not the problem.
34. If you are in doubt regarding your exhaust pipe being plugged, put your hand behind the muffler to see how much pressure is expelled. compare to another bike.
35. It should blow pretty good and have a distinct pop pop pop pop sound while idling, not a steady humming.
For more information about your question and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
https://www.o2w.co.uk/tagforum/viewtopic.php?t=7896
Troubleshooting
Yamaha MBK YQ100 Service Manual
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YAMAHA AEROX YQ50 Owner Manual

Posted on May 29, 2017

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Posted on Jan 02, 2017

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robotek
  • 1512 Answers

SOURCE: V-Belt flashing

Hi carms

Even although you have just had it serviced, the warning light is triggered by the mileage traveled. So if the belt appears to be Ok, then resetting it has to occur at the point when the indicator comes on. Having said that, I understand that scooter belts can weaken (and break) from internal weakening over time (heat and stress) and not just from external wear and measurement. Over the years I have read about belts breaking (other scooter brands & models) from high use and/or mileage even though they still externally measured within spec.

The "service limit" for the Majesty belt is 27mm (shop manual) or 12,500 miles - so to be safe it should all be interpreted as "replace belt upon the soonest of 12,500 miles or 27mm width"


If they have not replaced the belt in your recent service, then you could perhaps return to them to have it done, or reset the idiot light for you. OR you could do it yourself and see how you go.

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If you're wondering where the area that the diagram above is indicating, the reset coupler is the white plastic coupler located under the tailpiece where the battery is located. The rubber strap securing the battery holds it in position and it is the only white coupler in the vicinity of the battery. I also read that you need to have the park brake off to perform this exercise.


I got some of this info from a great site dedicated to your bike. Check it out here. Thanks for using FixYa. A FixYa rating is a grewat reward for my time taken to address this with you. Cheers!

regards
robotek

Posted on Nov 13, 2008

  • 2 Answers

SOURCE: yamaha rxs 100cc note on horn alters when indicators or brakes on

check all your male and female connections on your wires for corrosion and also make sure they are matching with the right colour coated wire

Posted on Apr 25, 2009

  • 1 Answer

SOURCE: Yamaha TTR 125 L won't idle

i cleaned the carb on the bike and put it back together and now it is as if the float is stuck open and is just dumping gas out of the carb all over the ground.

Posted on Sep 02, 2009

carlsbiz
  • 1124 Answers

SOURCE: Yamaha TW 200 starts but won't run.

If the bike has sat for a long period of time without being run - the gas that is sitting in the carb(s) will shellac.. Then the carb(s) would need to be cleaned and "rebuilt"..

Posted on Sep 14, 2009

Pristonero
  • 119 Answers

SOURCE: i have a yamaha aerox scooter and it keeps blowing

if you recently add an accessories such as troub light, halo light, horns etc etc double check their wires there is a loose connection maybe both wire are having contact or a strip wire is touching the scooters chasiss, hope this help

Posted on Oct 19, 2009

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Clean out your carb?
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, but I might be wrong, (have been before :) )
Carburettor cleaning fluid is good stuff.
Hope you get it sorted.

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