singram

That and I believe it actually says HISS on the ignition- I wonder why no HISS in the US? Cost?

All good things to look at, will do

Yeah, the F4i did in fact reach spec overheat temp of 251, FI light flash and engine shut off once, so legit is overheating. I did the whole wire fan to run constantly thing, but the fan isn't the issue. I'm almost 100% confident the issue lies within the radiator core itself- why, I dont know. I tried ordering a Chinese knock-off radiator supposedly rated for an F4i. It turned out to be absolutely incompatible, which sort of burnt me on going for anything else outside OEM. Now having 3 bikes, this isnt a priority issue- just enough of an issue to drive me up the wall. It has about 55k on it, but is insanely smooth and reliable otherwise, like I'd imagine it would be brand new. I'd love to get the temp issue sorted to justify new plastics and reserrect it. I may end up just making it a trackbike, dont know..

I'm currently battling the same issue with an '02 CBR F4i. Coolant has been flushed and burped to death, radiator cap replaced(Stant aftermarket from Autozone, but still rated at the recommended 17psi),the pump is circulating and not leaking, the thermo has been replaced, the fan spins. The temp just steadily rises and rises when sitting or under 50mph cruising. Temps start to drop at highway speeds, but its really nerve wracking otherwise. The radiator looks like shit, but not much worse than alot of bikes I see on the road. I keep my I open for a nice OEM radiator off ebay, so for now its a cold weather only bike. Funny, I scored a decent radiator/fan/switch/cap assm for sale a couple months ago. Prior to the dipshit seller shrink wrapping it to ship, one of the mounting grommets came off and pressed against the fins of the radiator creating a nice round hole in an otherwise very decent radiator- it was shot.

Thanks for the replies guys, all good stuff to have a look at. The wife and I got it plated and legal this morning and took it out for a good 80 mile ride out in the country. Suffice it to say that I believe all is good fuel related😀 The temps(in my opinion) reached dangerously high creeping thru the touristy 'burbs- 245 at one point, but I cant fault her, air temp today reached like 105. 2-up on the Blackbird is everything I imagined it would be. The wife also highly approves!😁

Fair enough😅

Oh, no worries on the edit. Was just kidding about the username. I work from home on company equipment, so I'll probably limit my posts to motorcycle specific topics😁

FULL SOLUTION IN THIS POST Honestly given how dead typical motorcycle enthusiast sites have been for the last few years, I honestly didnt expect many(if any) responses to my original post so I just whipped my account together on the fly. Maybe I'll dump this account and sign on with a new one with a more covert username😄 Seriously, I'll be minding my Ps and Qs under this username and limiting my posts to motorcycle related topics, so not overly concerned, LOL! On the note of the first ride on the resurrected bird- I moved forth with clipping both ends off the Brown wire(pump side and relay side)and routing another wire along the harness. The pump side, I clipped off the brown connector and attached insulated spade connectors on the Green and Brown wires. The relay side, I cut the brown wire as far down as I could and attached the exterior cable with a wire butt connector. Finally, put a couple gallons of fresh gas in the tank. On initial start-up after the rewiring, the pump would prime, the engine would turn over, but would not start(here we go again). Just for grins, I hit the ram air intakes again with starting fluid. This time its started, stumbled a bit and eventually the idle little by little started smoothening out. Revving her a bit was very smooth. I took her for a spin around the block with no issues, then got her out on a real road for a couple miles(technically not plated or legal yet)and got it up to about 80mph with no issues. My theory is bad/old gas in the tank, line, filter. Just need a good Italian Tune-up!😄 Given this, I also believe that when I initially jumped the pump a couple days ago, it would have started had I done this same thing at the time.

Oh, its a conjunction of my first and last name.

I very much appreciate the offer, sir. It looks like I've solved the issue. In answer to your question, I did in fact check all relays(all good). The pump was able to prime when jumped directly to the battery, but not in circuit. I initially noted voltage being sent up to the pump when the bike was in the ON position, but closer inspection showed that this voltage dropped out after 1 second, and no voltage at the pump connector with the pump connected. The answer came pretty quickly yesterday when I noted that I was getting continuity from the Pump Green to the frame Ground, but ZERO continuity from Pump Brown to the relay. In running a separate test wire from the pump to relay I was able to not only get the pump to prime, but was able to get the bike started, pretty much isolating the trouble to Pump Brown wire to the relay. From here, I'll most likely just clip off the Brown wire connectors at the pump and relay, and run an insolated external wire along the harness. Maybe this Winter I'll remove the tank, unravel the harness and fish out the remnants of the brown wire, but I think I'm going to get fsome seat time on this bike first Wow, I'm VERY impressed at the amount of responses and help I've gotten from this site in such a short amount of time! I really thought motorcycle enthusiast forums were pretty much a thing of the past and I'd have to go it alone. Thanks again everyone, I think I'll stick around for awhile!

Yeah, same thing I'm seeing too.

Yeah, I noted that harness connector as well. I may having a closer look at that this Winter when I have the tank off anyway to replace the fuel filter as precaution. For now, snip/snip and new Brown wire insulated and ran alongside the harness.

Hmm, regarding that fuse, when I traced the brown wire from the relay to the pump, I didnt note any fuses on that circuit. Maybe on the brown/black wire going to the ECU(?) Dont know.

I'll definitely give that a look at as well. HUGE thanks to all help!! Regarding how much I paid, get this- I believe you assisted the seller with this issue back in May😆 I scoured all the back thread in the Garage section hoping to find something that would help with my issue when I came across a thread where the member had the same exact pump/electrical symptoms as me. Digging deeper, he also had a red 2001 bird and according to his sig, also lives in the Chicago area(figure the odds, LOL!!). I guess he just gave up on it and sold it for $3500. to me 🤔 But yeah, this bike is friggin MINT. He placed it on Craigslist on a Sunday morning, I was the first person to call on it. Bought it non-running instantly.

Ok, we're much closer. Here's what I got now- With a meter across the pump connector leads(pump attached)- no voltage at start Testing voltage across connector leads with pump disconnected- 12v for 1 second only, then nothing Testing continuity from pump connector GREEN to frame Ground- Good Very important here - Testing continuity from Brown pump connector to Fuel Cut Off Brown- NOTHING Ran an auxiliary wire from the Pump connector to the Fuel Cut Off Relay in tandem with the Brown wire- Pump primes, motor starts and BlackBird Fires to life!! Sooo, damaged Brown wire? Looking at the wiring diagram, Brown doesnt seem to go anywhere or to anything else. Can I simply snip the Brown off the Relay side and pump side and simply run another wire in parallel and insulated with the main harness?

I'm sorry, I thought it was clear the first time I read your suggestion 😀. The first test, I'll be testing voltage at the pump wires with the pump attached and the Start switch i the ON position. Easy enough. The 2nd test, also with the pump attached and the switch ON, I'll first test voltage from the (Green -)to the battery NEG, then from the (Brown+) to the battery POS, is that correct?

Beautiful example, Jon! Agreed on not needing the extra weight.

Your instructions are pretty clear, let me hold onto your offer and give them a shot after work- thanks! Agreed, lets see what I can come up with today. I'll update from there. Thanks!

Hmm, whats our move from here?

Update!! I hit the front ram air vents with some starting fluid and she started up!! Sooo, fuel injectors I'd imagine. But why would the pump not prime while in circuit, but will when jumped? I cant tell if this just got easier or harder😄

Makes sense. I think we're on the same page on that note. For sure not limited to the pump, thats for sure. Yup, you and me both.

Hmm, honestly that was not even on my radar given that the pump will not prime while in circuit. Lack of spark could prohibit the pump from priming? If thats possible, worth looking into, I suppose. On another note, do you still have your '01 BB? I ask because given the condition of the bike, I'd rather send my ECU to someone willing to hook it up to their bike as opposed to tearing too deep into a showroom condition Bird.

Hey there, Jon. I agree, the ECU is definitely a top contender. Given that I'd imagine a used ECU would be a non-returnable item, I'll give the "free" tests a go first. That Triumph in your sig, Speed Triple? I have a cafe'd out '07. Once the charging/starting issues were sorted, its an amazing bike.

By the way, Superhawk- nice bikes!! A few years ago, my F4I spent the Winter in my living room while sorting out the valve adjustment and undertail😀 Speaking of undertails, I haven yet sourced a solution for the BB, but its on my short list once it starts-she's got a BIIGGG a$$😄

This is correct, though important to note- I've also attempted to start the bike while "jumping" the pump to an external 12v battery. Although the pump does prime, the engine just cranks away without starting. I'll need a bit of time to test your recommendations, but it seems like the bike is in some sort of "lock out" state, either by design(switch, sensor, etc), or some sort of short or connectivity issue. I welcome any and all recommendations and assistance(the responses so far are hugely appreciated!), but it really seems to me that this issue is beyond fuel delivery. Just my thought, you guys are the Blackbird experts! 🙂