New Rider
![*](//storage.proboards.com/forum/images/stars/star_black.png)
Currently Offline
Posts: 4
Likes: 1
Joined: Nov 15, 2014 14:21:19 GMT -5
|
Post by warcamel on Nov 15, 2014 14:29:10 GMT -5
Hey Riders,
My first time on the forums, nice to see an active community. I have a Yamaha Morphous 2006 and since it's not a popular scooter I have a really hard time finding information on it.
Issue - If I give full throttle the engine stutters. (this happens around 35-42 mph) It makes me back off the throttle before I can go full bore again. This problem has surfaced around 2k miles ago, and I've yet to isolate the issue.
Question 1 - I've cleaned the carb out about 5 or 6 times over the last 9,000miles. I've NEVER seen a jet to clean on it. I let it soak in carb fluid for a few hours and that does the trick. Is there jets on the Morphous? Where are the jets if so??? If you have a pic I'd be so grateful.
Even soaking the carb it doesn't solve the engine stutter issue. I changed out the air box because I had a hole from when the rear tire blew up. I've done spark plug, air filter, coolant, oil, I even run with stabil in the gas tank.
Anyhow I'm hoping a fellow owner can help me out. Thanks again
|
|
|
Post by scooter on Nov 15, 2014 15:05:42 GMT -5
Hey Riders, My first time on the forums, nice to see an active community. I have a Yamaha Morphous 2006 and since it's not a popular scooter I have a really hard time finding information on it. Issue - If I give full throttle the engine stutters. (this happens around 35-42 mph) It makes me back off the throttle before I can go full bore again. This problem has surfaced around 2k miles ago, and I've yet to isolate the issue. Question 1 - I've cleaned the carb out about 5 or 6 times over the last 9,000miles. I've NEVER seen a jet to clean on it. I let it soak in carb fluid for a few hours and that does the trick. Is there jets on the Morphous? Where are the jets if so??? If you have a pic I'd be so grateful. Even soaking the carb it doesn't solve the engine stutter issue. I changed out the air box because I had a hole from when the rear tire blew up. I've done spark plug, air filter, coolant, oil, I even run with stabil in the gas tank. Anyhow I'm hoping a fellow owner can help me out. Thanks again I don't know. That sounds like it could be fuel OR electrical in nature. I think my first bike with bad points did that. Then again, if it doesn't happen until you get to a certain speed, it could be vacuum leak or fuel pump failure. The jets would be on the inside of the carb, under the float bowl. Anyway, while we wait for the pros to come and answer your question, tell me about your bike. That Morphous is a good looking scooter. How does it feel to sit on and to ride?
|
|
|
Post by alleyoop on Nov 15, 2014 16:08:55 GMT -5
Are you sure it is a carb and not just an EFI throttle body because most Morph come with EFI's? If your not sure take a picture of it but if it has a BOWL and you took the bowl off then it is a CARB and the jets are in there . Here is where the jets are in the carb. Alleyoop
|
|
New Rider
![*](//storage.proboards.com/forum/images/stars/star_black.png)
Currently Offline
Posts: 4
Likes: 1
Joined: Nov 15, 2014 14:21:19 GMT -5
|
Post by warcamel on Nov 15, 2014 17:40:45 GMT -5
|
|
New Rider
![*](//storage.proboards.com/forum/images/stars/star_black.png)
Currently Offline
Posts: 4
Likes: 1
Joined: Nov 15, 2014 14:21:19 GMT -5
|
Post by warcamel on Nov 15, 2014 17:42:38 GMT -5
There is no float or jets on teh carb. Every screw is out of it.
Scooter to answer your question, it rides really nice. The scooter is very smooth, my only qualm about it is the long term comfort in the saddle. One hour on it and my butt is sore. Other then that, it's a blast.
|
|
|
Post by alleyoop on Nov 15, 2014 18:27:01 GMT -5
Yep that is what I thought it is just a throttle body and the fuel is controlled by the ECU and the INJECTOR, no jets. Now if you have a little problem idling the throttle sensor can be adjusted a little a by loosen the screw and you should be able to move it a little up or down in the slot. Other wise the ECU can be programmed, but you need the software.
What is the problem maybe the filter is dirty and or there is a leaking hose or something. These systems even a carb system are a closed system and any extra whatever will effect the fuel and air delivery mixture. Alleyoop
|
|
|
Post by alleyoop on Nov 15, 2014 18:39:51 GMT -5
The problem is you do not know what part of the system is bad, it could be the sensor the ecu the injector etc.. The Ecu alone runs over $400.00 bucks. Now some have just converted it over to a Carb a much cheaper solution. The EFIs are great when they work but when they go south it is going to cost some bucks. Just to check it out will cost you plenty because of the equipment the shop needs to have. Also the mechanic better know what he is doing as well. Alleyoop
|
|
New Rider
![*](//storage.proboards.com/forum/images/stars/star_black.png)
Currently Offline
Posts: 4
Likes: 1
Joined: Nov 15, 2014 14:21:19 GMT -5
|
Post by warcamel on Nov 15, 2014 19:48:36 GMT -5
Hey Thanks so much for your advice. It's nice to finally understand what I'm looking at. It's also concerning that it'll cost so much $ to check the ECU. I started using gasoline with no ethanol which I'm hopeful that makes a diff. I soaked the carb for a few hours today. Fingers crossed it works.
Thanks again for your help.
|
|
New Rider
![*](//storage.proboards.com/forum/images/stars/star_black.png)
Currently Offline
Posts: 46
Likes: 2
Joined: May 14, 2014 4:56:34 GMT -5
|
Post by bnc on Nov 16, 2014 2:26:32 GMT -5
I would begin by cleaning the TPS (throttle position sensor). It is the electrical device on the right side of the second photo down from the top. This device is basically an electrical potentiometer like the manual volume control of old radios and TV's. When you move the throttle, its job is to tell the computer where you set the throttle. If it gets dirty inside it will be like a scratchy volume control sending mixed messages to the computer where you set the throttle. Here is part one of a three part video about how guy cleaned his on a Yamaha R6.
If you have an electronics background and own a multimeter, a simple test is to measure the resistance of the device and smoothly rotate it through its range. The resistance should likewise change smoothly. Any jumping around means it needs a good cleaning. The computer will interpret the jumping around as how you are controlling the throttle.
|
|
|
Post by bandito2 on Nov 16, 2014 22:36:34 GMT -5
Your best bet may be to get it to a shop qualified to service Yamaha scooters. BTW a new ECU could be had for $323.86 from here: www.servicehonda.com/parts/lookup#/Yamaha/MORPHOUS_-_CP250V_-_2006/ELECTRICAL_1/CP250V_(2006_SCOOTER)/ELECTRICAL_1_(CP250V_-_2006)You could also look up on the part "Intake" to see the TPS at the lower part of the diagram item #27 here: www.servicehonda.com/parts/lookup#/Yamaha/MORPHOUS_-_CP250V_-_2006/INTAKE/CP250V_(2006_SCOOTER)/INTAKE_(CP250V_-_2006)Would you really want to go through the trouble and expense to convert to a carbed system and hope that it would work as well as the EFI system without FIRST having it checked? Ask how much it would cost to be checked. It may be as simple as the TPS needing cleaning, fuel filter, or perhaps leaky air hoses. It could possibly need a pipe inlet assembly (injector) or fuel pump. Those may cost $$, but I think that would still be less expensive and work better than cobbling something else together. I don't mean to sound harsh, just realistic. And it is apparent that your knowledge is lacking regarding carbureted & EFI systems. If it were me, I would try to get the system that is already in place functioning. That may be a consideration should you decide to eventually sell it as well. I wouldn't trust a bike with a workaround like that..... But that's me. just sayin.
|
|
|
Post by rockynv on Nov 17, 2014 5:10:02 GMT -5
You have to be careful on and throttle body since there are delicate electronics that won't respond well to being immersed in carburetor cleaner. You could have a problem such as a bad connection to the Oxygen Sensor, Throttle Position Sensor or Mass Airflow Sensor or it could be something along the lines of the muffler was not reinstalled correctly after a rear tire change allowing air into the exhaust throwing the Oxygen Sensors reading off.
You really need to research the type of fuel injection system that was put on the bike and consult the manufacturers trouble shooting chart before tearing into it again.
|
|
New Rider
![*](//storage.proboards.com/forum/images/stars/star_black.png)
Currently Offline
Posts: 46
Likes: 2
Joined: May 14, 2014 4:56:34 GMT -5
|
Post by bnc on Nov 17, 2014 16:39:37 GMT -5
If you have no skills, disconnect the TPS from the bike and take it to a dealer for testing. I have worked on fuel injection systems for years and have most the tools to test them and the TPS has proven the most common failure. Having an engine steam cleaned can destroy them. They are poorly sealed, wire wound, variable resistors.
Oxygen sensors are next in line but typically exhibit different symptoms than described. The O2 sensor most often will become contaminated causing its calibration to change so that the vehicle will test high in NOx (lean) in an emissions test or high in hydrocarbons (rich).
ECU's have proven to be very reliable at least in the past ten years.
|
|
|
Post by alleyoop on Nov 17, 2014 19:40:52 GMT -5
Since you have worked on EFIs for years you should know what they charge for a diagnose and or test, give the op a estimate of what a diagnose will cost him that way he will get a flavor for what a fix will be.
|
|
|
Post by rockynv on Nov 18, 2014 5:08:46 GMT -5
It is the injector nozzle that gets clogged and you just remove the nozzle and soak only the tip in cleaner not the complete unit. Generally there is little benefit from soaking the entire throttle body and you can throw the electronics out of calibration or destroy them by doing it. You usually just adjust the throttle grip and throw some fuel injector cleaner in the fuel tank once every month or so on a fuel injected bike and leave the throttle body alone. You might want to go through your owners manual to see what is actually recommended by Yamaha before tearing into it again. A owners manual is available at the following link (check out section 6): www.manualslib.com/manual/659484/Yamaha-Morphous-Cp250v.html?page=54#manual
|
|
New Rider
![*](//storage.proboards.com/forum/images/stars/star_black.png)
Currently Offline
Posts: 38
Likes: 3
Joined: Dec 8, 2014 5:48:22 GMT -5
|
Post by sevenwheels on Dec 14, 2014 6:21:37 GMT -5
There is a known problem with fuel pumps in the Morphous/Majesty era that you have. A diaphragm problem was the subject of a recall some years back. You might want to scoot over to Majestyusa.com for a visit. The Morphous and the Majesty share most parts and have identical fixes for most common problems. David
|
|