History:

I have an 01 F4i, which has been running good, though I recently noticed a noise which only occurred around 5,000 RPM and higher. I thought this could be the CCT, so I replaced the old one with a new OEM one.

After everything was put back together it would crank but not start. I checked the timing by pulling the case & valve cover and alining the "l" with the groove in the case cover. Both the "IN" & "EX" were straight with the surface of the head.

Also changed the spark plugs, then put the bike back together.

Issue:

The bike starts up and seems to idle fine, but when you give it throttle it will only go to 2K before it drops down/cuts out to idle speed. I can hold the throttle open and it will rev to 2,000 then drop to 1,000 and continue to do this back and forth until you release the throttle.

Note, the red FI light is not blinking at all.

Help!

 

so by pulling the valve cover off and everything that means you also checked the throttle cable and made sure your butterfly valves were opening?

 

Is your map sensor all plugged in? Look around all the stuff you touched while doing the cct.

 

the valves on the throttle bodies look like they are working/opening correctly, but i will double check. Should i be checking for something specific?

The map sensor is plugged in. Though i must be missing something, i will continue to re-trace all my steps.

Thanks you guys! I know we'll figure this out.

 

Here is a video i found that does what is happening, except mine starts at 2,000 RPM then drops to 1,000, it does this back and forth.



I unplugged the green neutral switch connector but still has the same issue?

 

Wanted to circle back to this thread incase anyone else ever experiences this. Ended up taking my bike to a shop. They had it for quite a while and couldn't figure it out. They then sent it to another shop (Honda) and they worked on it for ~4 months. They went through everything, tried swapping parts, entire new wiring harness, new ECU, new throttle body, etc. They ended up figuring it out and fixed the problem. They said somehow one of the prongs on the cam pulse rotor (part# 14405-MBW-J20) got bent and this was causing all the problems. They replaced this part and it fixed all the issues.