Fuel injection on a 1977 KZ1000?

Can I install fuel injection on a 1977 KZ 1000? Has anyone attempted this with success?

I would say it wouldn't be too difficult. Get yourself an ecu, some GPz1100 throttle bodies with injectors, a fuel pump and regulator, and you're off to the races. Going to take you a bit of work to tune it, but its not hard to install.

T_Dub wrote: I would say it wouldn't be too difficult. Get yourself an ecu, some GPz1100 throttle bodies with injectors, a fuel pump and regulator, and you're off to the races. Going to take you a bit of work to tune it, but its not hard to install.

HEH HEH HEH - talk about understatement... :lol:

Gary - K7GLD wrote:

T_Dub wrote: I would say it wouldn't be too difficult. Get yourself an ecu, some GPz1100 throttle bodies with injectors, a fuel pump and regulator, and you're off to the races. Going to take you a bit of work to tune it, but its not hard to install.

HEH HEH HEH - talk about understatement... :lol:

Where's the understatement? Hardest thing about installation is installing a return line to the tank, and finding a place to mount the fuel pump.

Tuning is easiest if done on a dyno, cheaper but more time consuming if done with a widebamd O2 and datalogging.

steell wrote:

Gary - K7GLD wrote:

T_Dub wrote: I would say it wouldn't be too difficult. Get yourself an ecu, some GPz1100 throttle bodies with injectors, a fuel pump and regulator, and you're off to the races. Going to take you a bit of work to tune it, but its not hard to install.

HEH HEH HEH - talk about understatement... :lol:

Where's the understatement? Hardest thing about installation is installing a return line to the tank, and finding a place to mount the fuel pump.

Tuning is easiest if done on a dyno, cheaper but more time consuming if done with a widebamd O2 and datalogging.

WELL, first, WHICH ECU - and from where? Perhaps the whole injection setup from a GPZ?

WHICH fuel pump? Perhaps also from a GPZ?

AH - then the tuning - easy or hard, depending upon WHO you are, and WHERE you are, and whether you HAVE all the expensive tools and related hardware - in a larger metropolitan area, perhaps some expert help, but anywhere out in the rural sticks, perhaps NOT so easy - so the one trying all this had BETTER be well experienced in turning a wrench, and detailed computer tuning...

Good luck to the OP, and any others making the swap, I suspect a large amount of blood, $weat, and tear$ will be involved...

IF not, I sure like to see a writeup - I might wanna do the same thing on my '83 1100LTD...

Fuel Pumps & Regulators
www.fuel-pumps.net/gsl393.html
www.mpsracing.com/products/MPS/FuelPumps.asp
www.airtexproducts.com/

If you go with the system from a GPz, you'll need the computer (and where to mount it),sensors(air temperature,engine temperature, & throttle position), a one way return valve to the tank to help maintain fuel pressure, injectors, and all related wiring.

Fuel pressure on the GPz's is 33 PSI at idle, going up to 35 PSI as soon as the TPS senses throttle movement.

Things to consider if you use a FI system (as delineated above by Mike) is that these early generation systems are basically non-adjustable. By that I mean that all the flexibility is already programmed into the ECU and you can't reprogram these early units. That early computer is expecting to be on a 1089cc motor (not a 1015cc) and will react accordingly. So, it is quite possible to design a FI for your 1977 motor, but some of the components will have to be later generation components (megasquirt, etc.). Search this forum for a KZ650 that has been FI'd by a fellow out of Oz (search under Dave Sloan).

MegaSquirt is a well known, proven EFI controller that is well supported, and the tuning software is free.

Suzuki EFI controller off the Hayabusa and GSXR600/750/1000 models has been cracked and the tuning software is also free.

GSL393 Walbro external EFI pump is $110

750 Turbo and 83-84 GPz1100 throttle bodies are available fairly cheaply, and many others can have their spacing altered to fit.

MegaSquirt varies from $140 to ~$500 depending on what you want to do with it, and how much assembly you want to do.

No expensive tools needed for tuning, many people have tuned using a cheap narrowband O2 sensor.


Last I heard Larry Cavanaugh was planning on using GPz1100 throttle bodies that had been bored by Sid Pogue, along with a MicroSquirt ECU. Dave has his fuel injected KZ650/810 with MegaSquirt, and there are at least a couple more people building big bore 1000's with MegaSquirt.

Personally, my ZX11 with MegaSquirt controlled coil on plug and Yamaha FJR 43mm throttle bodies is on hold due to medical crap.


Everything you need to know about converting a motor to EFI is in the MEGA MANUAL!!

Exactly what I said is correct. I assume the OP is somewhat mechanically inclined so installation of a FI system is not tremendously difficult.

TB's from a GPz1100 will bolt on with a set of J manifolds, and the injectors will be of an appropriate size (have them tested to make sure they're functioning properly).

Fuel pump and fuel regulator, just get universal units that can supply from 30-45psi. Put a return in your tank.

TPS will be on your TB's, and you'll want a MAP sensor, MAT sensor and wideband O2.

Coil on plug like steell's would be nice, but not necessary.

Use a microsquirt, lots of info available, free software. GOnna have to rig up a hall sensor and trigger wheel under your points cover, not ridiculously difficult.

Thats it, your FI system is installed. Now to tune. Hopefully the microsquirt software will give you a baseline for ignition and fuel. You can set your ignition mao easily, use the same as stock, its listed in your FSM. If there's a baseline fuel map, that might work. Bring it to the dyno now, the guys there will help you tune, it'll probably cost about $1000 to get a tune put together. If you do it yourself, using the dyno will be $100-150 an hour til you're done.

If dyno tuning isn't an option, use the base tune I mentioned, and set up datalogging (hopefully theres a function for this in your ecu). go out for a short run, come home, change settings based on what you have. Go out again, come home to tune again. Do this until your map is just right and you've got the correct AFR in every situation.

I think we scared off Larry_Mo... :huh:

Yeah probably. Oh well.

T_Dub wrote: Exactly what I said is correct. I assume the OP is somewhat mechanically inclined so installation of a FI system is not tremendously difficult.

My post was directed at Gary - K7GLD, no one else.

You actually don't need a trigger wheel and sensor, you can trigger off the coil on a points or electronic ignition. My system is much more complicated, simply because I can