Yamaha Morphous - Does this scooter have jets in the carb?  By  warcamel (Read 6,984 times)

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? 

Alleyoop if it is just a throttle body...will it have jets? If so are they in a different area? I googled EFI throttle bodies and it does look like that. I included some pictures from EVERY angle of the carb.

Question - if this is an EFI do they not have jets?

I had a neighbor who is a mechanic (but not a motorcycle/scooter mechanic). He was perplexed and had no idea. The carb is all one piece.

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

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.

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.

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.

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