Fuelling Issue?? Idle + VTECH - A bunch of weird things

Hi guys,

Have been browsing the forum for some useful information; found some tips but nothing that mimics my experience;

I have a 2012 with 96,000 kms, down in Melbourne, Australia.

Recently did an oil change, brake bleed some standard TLC got the injectors serviced. I had not changed the fuel filter in a few years so took the opportunity to do this also with an OEM fuel filter. I have also ordered a new hot idle wax unit as I think mine has been shot; on Occassion it does not idle consistently, a few months ago a mechanic messed with it and turned the adjustment nut a few turns...go figure...

Once I reassembled everything, the bike started falling over itself and sputtering badly around 6,500 -6,800 RPM's. (Side note: I will admit, the reassembly of the fuel pump assembly into the tank after the filter fitment was a bit tricky and I was not sure if shoving the last bit of the steel wool filter was the way to go but I could not get it to fit otherwise..). Because I had fit in a new filter, I suspected perhaps an incorrect assembly causing fuel delivery restrictions?

To avoid draining the tank, I thought I would have a look at the vacuum hoses to make sure there were no vacuum leaks - sure enough found the vacuum hose for the flapper valve off the intake nipple. (Should mention that the bike has had the snorkel delete, flapper mod + PAIR delete (blocked off) for a while and it was running great). Took the time to redo all the vacuum hoses with fresh silicone hoses; MAP + FPR circuits. Blocked off the flapper valve hose with an end cap so no vacuum leaks now!

After this, the power all the way through VTECH to red line seems much much better, doesn't stumble but it does occasionally hesitate between 6,500 - 8,000..almost stutters through the revs all the way to redline..Gut feeling is that it feels like a fuelling issue at this time to me...

A few other mystery items; After the bike is warmed up, I can smell what seems to be a rich exhaust... (i have a REMUS exhaust system on it (just the cans and piping from the collector)

Also the left side exhaust (standing behind the bike) feels warmer than the right side?? I tried to read up on how the collector box is made but on the face of it looks as though it is a 4 into 1 and then into 2 for the cans?
I am thinking before pulling out the fuel pump again, my FPR may be malfunctioning?

I could not smell any fuel or see any visible fuel leak out during priming with just the ignition ON? Could it be just stuck shut?

Did a starter valve sync and got a solid steady adjustment 8-9 inch of vacuum.




I really appreciate you guys helping out...really doing my head in..

 

Are all of the vacuum values soposed to be identical for the 6th gen?
I own a '98 (5th gen) and the FSM states they are not!

 

Hey RillwJoe,

Yeah..they are all referenced to cylinder 4, I set up the gauges so the one on the left is cylinder 1 and the one on the extreme right is cylinder 4.

 

Get an infrared temperature gauge, they so cheap and so handy

 

Have you replaced the spark plugs in the time that you have owned your VFR?
You might want to pull them to see how they look.

 

yes I had replaced the spark plugs a few weeks ago before I got into the fuel filter and the SVS..ran fine.


Today i noticed the rear 2 exhaust headers were cool much after the front 2. Given they were on the idle circuit I cracked the throttle and sure enough they started warming up pretty quickly. I do not think it is a spark issue because it wouldnt fire up under throttle application?

i think the mechanic screwing around with the idle unit messed things up. Even though I synced them pretty close; i am assuming perhaps the throttle bodies themselves need some cleaning? The filter had black fuel pouring out when i pulled the old one out and some of the injectors were partially blocked before i had them serviced however the bike did not seem to lack power and no issues on VTECH either....just a low end vibration..

i am considering ordering a FPR now as it could be a failing FPR? i did pull the vacuum hose again but couldnt spot any fuel there but what if it has not leaked at the diapghram but it is malfunctioning none the less? Any suggestions for an aftermarket FPR or just go OEM?

Also not sure if the throttle body has a rebuild kit? Or just needs a good disassembly and clean?


Thanks guys

 

The only path for idle air is through the starter valves, the butterflies are basically sealed shut at that point. If you've synched the vacuum then you ought to have uniform airflow at idle.

 

Absolutely. Although after I put the last post I remembered that when I had done the vacuum after the hot idle unit has done its job..I actuated the hot idle unit by hand and i noticed all valves squeaking. Not sure if this is normal and they need to be silent but I noticed some minor play in them maybe thats why they were squeaking as they were moving? I did give them a dose of WD-40 but that did not stop the squeaking...