Gen2 Busa won't start

[mkbusa7]

Hello,
I'm new to this forum although I have been reading forum postings for a while.

I'm building a bike engine car with a Gen2 Hayabusa engine, wiring harness and ECM.
At the moment the engine cranks, the fuel pump is working correctly and I tested for spark on cylinder 1. However I suspect the injectors are not working. I do not smell gas when cranking the engine. I have a side stand bypass installed and the TOS disabled in the ECM. I don't have a bike dash but I do have the Healtech OBD-S01 interface and I see the positions of the throttles and other information.
I'm quickly running out of ideas on what would prevent the engine from starting. Can anyone make suggestions I could try?
Thanks

 

[mkbusa7]

O

 

[Kiwi Rider]

Wow! Very cool Lookin car!!
Welcome along, it’s time to visually inspect fuel delivery and pressure (if you don’t have a fuel pressure gauge, get one!)
You could spray some starting fluid down the throttle bodies while crank to see if it fires up and runs at all.
If you have a Busa dash, plug it in and try it again, it may be that the healtech dash is incompatible in some way.
You could pull an injector and check for spray pattern while cranking the engine…
I dunno, it’s hard to know over the internet… good luck man!

 

[BigBSBusa]

Welcome!

 

[Hayabusa Wannabe]

Welcome to the formum @mkbusa7. Cool car!

 

[mkbusa7]

Thank you Guys,
I'll see if I can narrow down the problem and let you know what I discover.

 

[mkbusa7]

Status update:
Engine starts and runs on starter fluid! This is great news!
However it doesn’t run on fuel.
Checked the cranking voltage and it goes down to 11.2-11.6 volts from an unloaded voltage of 12.6v.
Need to see where the voltage drop is. First I will see what the cranking voltage is at the battery

 

[Kiwi Rider]

Status update:
Engine starts and runs on starter fluid! This is great news!
However it doesn’t run on fuel.
Checked the cranking voltage and it goes down to 11.2-11.6 volts from an unloaded voltage of 12.6v.
Need to see where the voltage drop is. First I will see what the cranking voltage is at the battery

No, the starter voltage drop is perfectly normal! Even as low as 10v is ok . . the starter current draw is high and the voltage drop reflects that . . .

Starter Current Draw Test: Testing Starter Motor

If a vehicle dispays no starting or slow starting conditions a starter current draw test may be in order. How to perform a starter current draw test. What is a starter current draw test? No start and slow start troubleshooting resulting from starter problems

www.freeasestudyguides.com

Great news that she started and ran on starter fluid!
This means your electrical system is ok and the spark plugs are working as they should.
Next step is testing fuel delivery to the fuel injectors and also fuel pressure up to injectors.
If you don't have a fuel pressure tester, you can pull an injector from the cyl head and see if it sprays any fuel at all while cranking the starter motor.
The pump may be working fine (you can hear the pump run when you turn the key?) but if the fuel pressure regulator is faulty there will be no pressure up to the injectors.
So this is why a fuel pressure test is so important!
This is why you should never assume that because you can hear the pump running, the injectors will spray fuel

Fuel pressure should be 3 bar (42psi)

 

[mkbusa7]

Thanks @Kiwi Rider.
My next steps are to put an oscilloscope on a primary injector wire from the ECM and see if the ECM is driving the injectors. Then as you say is to check the fuel pressure. I need to get my hands on a fuel pressure gauge.
One question. Does the bike have a fuel pressure regulator? I'm hoping my fuel pump does have an internal regulator but a pressure test will tell me one way or another.

 

[Kiwi Rider]

Thanks @Kiwi Rider.
My next steps are to put an oscilloscope on a primary injector wire from the ECM and see if the ECM is driving the injectors. Then as you say is to check the fuel pressure. I need to get my hands on a fuel pressure gauge.
One question. Does the bike have a fuel pressure regulator? I'm hoping my fuel pump does have an internal regulator but a pressure test will tell me one way or another.

You can test for signal at the injector connector with a cheap 'Noid Lamp' . . .
If you have the signal from the ECM it will flash as you crank the starter.

You said . . ."One question. Does the bike have a fuel pressure regulator?"
Answer . . Yes, ALL fuel injection systems are pressure regulated.

The fuel pressyre regulator is built into the fuel pump assembly on a Busa tank.
Are you running an in-tank pump? and what pump is it and what is it from originally?

 

[mkbusa7]

It has a 'universal' injection pump and an integrated fuel filter and 4 bar (58PSI) pressure regulator. I believe it is a Bosch unit but I assembled the fuel tank months ago so that may not be correct.
I think this should be OK. I need to check if the injectors are firing first.
BTW The engine sounds mega without a muffler! So happy that it is working even if only on starter fluid.
Thanks for your help

 

[Kiwi Rider]

It has a 'universal' injection pump and an integrated fuel filter and 4 bar (58PSI) pressure regulator. I believe it is a Bosch unit but I assembled the fuel tank months ago so that may not be correct.
I think this should be OK. I need to check if the injectors are firing first.
BTW The engine sounds mega without a muffler! So happy that it is working even if only on starter fluid.
Thanks for your help

No worries, I'm happy to help out when I can.
One thing though, 4 bar pressure is way to much!
You really need to bring that down to 3 bar, it won't run well with too higher pressure.
So you will need an adjustable fuel pressure regulator.
But check for signal pulse at the injector connector, with your oscilloscope ore as I mentioned earlier, a noid light. If there is no signal, next step is to check for continuity from the injector wire thru to the ECM terminal of that same wire.
Any help I can give, just ask.
Glad to hear it sounds 'MEGA' lol.

Bye the way, 'Do you know the way to San Jose' lol, one of my old favorites!

 

[mkbusa7]

First of all thank you for all your help.

The engine runs!!!!!

I removed the fuel rail and injectors from the throttle bodies and while everything looked fine and the rail was pressurized, giving me a petrol shower, I replaced the fuel rail and injectors with what the bike engine came with (a 6600 mile engine from a crashed bike). The throttle body and fuel rail I originally had on the engine came from a zero mile engine so I don't understand why it didn't work but it will be something to puzzle over in the days to come.

I'm hoping get to NZ over Christmas as my partner has family there. It's a beautiful country and one that would be delightful to ride through on a Hayabusa!