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Yes I understand that, I insist on cranking because in the past most of the times it manage to start after some retries, and switching off and on the igntion seemed to help. I did not exhausted the battery this time, I did not have any errors.

CPS measured at 299 ohms. Spark plug looks like this I tried again cranking this morning and I ve got no spark at all.

Second day with replaced, used fuel pump assembly. Today same situation. But i got this on video, is this a healthy spark?

Yes thank you for this, it must be able to plug in threaded stud, like the one I have (which connects to chassis on the other end, so only 3 cylinders work )

I don't want to think that I have two problems at the same time. Fuel pressure loss after ignition off which was verified with measurement but may be overcome with pump priming combined with a cps near failure. An in-line spark tester constantly on would be more useful, but I could not find one...

This afternoon leaving work the bike refused to start again. Did not have the spark tester with me unfortunately. I primed via d09 and it started but I had to do this more than once. After half an hour of riding without any symptoms I turned off the engine for 5 minutes at the post office ( near...

Today (12 hours after not being able to start it and having error 12 and battery kind of exausted) I plugged for a while the battery charger ( i have a dedicated socket ) and entered the diagnostics menu to erase the error 12 and retry. I haven't been able to delete it on d62. During d61 the...

Now it's getting more complicated. Today it refused to start. Primed 4 - 5 times, i even entered at diagnostic d09 to activate the pump continuously. No luck. I connected the spark tester and I only got one spark during one minute of cranking. Here is a few seconds video. I ve also got error...

I ve got two pressure regulators 2.5 bar in my hands. I have also arranged with the mechanic to replace the pump motor again in case it's the internal check valve that is occasionally leaking. But I am not sure if it is wise to make 2 changes at the same time.

the problem re-appeared. If its a vapor lock indeed, it wasn't resolved by replacing the pressure regulator. Could it be the fuel pump motor itself ? The mechanic had verified that the pressure was lost once in front of his eyes. Claimed that the only suspect is the pressure regulator and...

I have already contacted them. I will be on vacation the next two weeks so the bike will be resting too. I m curious if it starts ok after two weeks. Then will be used daily so I will know soon how it goes. I would be more confident if there new orings fitted also.

This is adjustable as it says.. can't see the range though. https://tmaxperformance.fr/en/products/regulateur-de-pression-tmax?pr_prod_strat=e5_desc&pr_rec_id=3b674aa0c&pr_rec_pid=10416108110155&pr_ref_pid=8180234617072&pr_seq=uniform

Here is the suspect. There is a code 6M21 on it. On the thread posted above the code was denso 4760 9J12. Dimensions are identical to the Ali regulator My plan is : - wait to see if the vapor lock is gone - visit another garage or try measuring the pressure myself to verify the 3.2 bar - see if...

Thank you for verifying..the common sense. I was starting to wonder about my ability to understand the basics. Now I have to to see if the pressure loss issue is gone and then deal with how to set the pressure at 2.5 without selling my kidney.

Found this on Ali but doesnt mention yamaha. Visually seems the same as far as I can tell but who can tell if it is ok to try. I m still confused if the 2.5 is the exact strict value or a minimum acceptable. As I read the manual I understand strictly 2.5 as you also mention, but there are many...

Yes, cartridge = fuel pump motor, apologies for my bad english. Thank you very much for posting this very useful info. just spoke to the mechanic. He had the pressure gauge connected and most of the times he had 3.2 bar. Once the pressure was lost so he decided to replace the pressure...

Can't find the pressure regulator part number at yamaha online catalogue. And I only find aftermarket universal regulators at 3.5 bar. Is it available as a genuine seperate part or as an aftermarket at 2.5 bar, does anyone know? AI claims that the issue might not be the regulator but the pump...

So to sum up: we want 2.5 bar fuel pressure just before the engine starts and during the engine operation, and maintain this pressure after turning off at least until the engine is cold. Am i correct?

Omg you re right, just verified what you said on the service manual. But shouldn't the pressure regulator adjust it to 2.5bar no matter what the pump gives ( as long it gives more than 2.5 ) ? IF the pressure gauge measures accurately, doesn't this mean that I have a rich fuel mixture? Will...

Aftermarket. The fuel pump is an Italian brand called RMS. My car mechanic (not the bike one) is quite disappointed with aftermarket parts quality the last 3-4 years, brands he trusted for decades have degraded too much their quality lately. I just realized with the help of AI that I might...