converting a warrior engine from EFI to carb?s.

[ckmustangcobra]

You will need a custom intake, a carb of proper size, and figure out a way to use existing sensors to trigger the coils.

Honestly with our ECUs and being a basic speed density fuel map... there isn't any air metering that will adjust the ignition timing... just RPMs....

I'm willing to bet if you ran our bikes dry (of fuel) and kept all existing sensors and solenoids in place, if would fire and run with pouring a little fuel into the air intake.

That being said........ I'm also willing to bet that these engines can be carb'd quite easily.

Carb, intake, custom cables and fab up some kind of low pressure fuel pump or gravity feed off of the main tank.


Like others have asked before.... Why?

Fuel mileage would not improve, hard to believe power would improve, cold starting wouldn't be pretty especially with HC pistons.

[mattbowdeen]

Patrick racing warrior 9.86@133mph, 60ft 1.44-1.45... Carillo rods, 380gram Je pistons, lightened crank by 6 lbs. Highflow heads(40% more over stock, 100mm bore(1775cc), Heavily modded downdraft carbs, Ignition controlled by modded stock computer, 6200rpm redline, 150hp, 150ftlb torque. 800lbs including rider... 86 lbs added to front of bike.

[MRMAXXX]

Originally Posted by mattbowdeen

Patrick racing warrior 9.86@133mph, 60ft 1.44-1.45... Carillo rods, 380gram Je pistons, lightened crank by 6 lbs. Highflow heads(40% more over stock, 100mm bore(1775cc), Heavily modded downdraft carbs, Ignition controlled by modded stock computer, 6200rpm redline, 150hp, 150ftlb torque. 800lbs including rider... 86 lbs added to front of bike.

So what was the compression on that motor?

Bob

[arizonawarrior]

From a 2002 article:
"They've only been working on the Warrior since January of this year- a very limited time of R&D, indeed. But in that short time, they have accomplished much. Due to "an inherently strong engine design," they've kept the stock clutch, transmission and crankshaft. In fact, the bike retains the stock starter and even with an increased compression ratio of 15:1, the Warrior has no problem roaring to life."

Ref: Patrick Racing Road Star Warrior - Motorcycle.com

[mitchell tannahill]

this is all great info, thanks a lot guys, do any of you know what sensors from the orignial harness can be eliminated and the engine will still run?? again, this is a custom project, stripping off all thats not required for the engine to run properly is what im after. i have read that the linear control valve can be eliminated, no problem, anyone tried this??

[Jbat]

many people have pulled the linear control valve or LCV, including me. with the fuel injection you just have to let it warm up a little when this is pulled and open the throttle a hair to start when it is chilly weather. With a carb I imagine you will have some sort of enrichment circuit that will help out so you def dont need the LCV

[gilly]

Yes, there are a bunch of us that have removed the LCV. Check out posts from ehacker. He changed out his FI for carbs and used the stock wiring harness. I think he just unplugged the fuel injectors but i would try and find the post where he states what he did.

[ckmustangcobra]

Originally Posted by gilly

Yes, there are a bunch of us that have removed the LCV. Check out posts from ehacker. He changed out his FI for carbs and used the stock wiring harness. I think he just unplugged the fuel injectors but i would try and find the post where he states what he did.

In order to keep the CEL off or some other issue, the fuel injector connectors should at least be grounded out properly, IMO.

[gilly]

Re: Carb.. This is where ehacker has the post on the carb if the link works. If not look under ehackers posts that says carb.

[alanh]

Originally Posted by mitchell tannahill

this is all great info, thanks a lot guys, do any of you know what sensors from the orignial harness can be eliminated and the engine will still run?? again, this is a custom project, stripping off all thats not required for the engine to run properly is what im after. i have read that the linear control valve can be eliminated, no problem, anyone tried this??

Mitchell ... if you state specifically what your preferred arrangement & modifications are for the existing components i'm more than happy to share my .02, opinions and the ramifications as time permits me.

Example; with or w/o tach, speedo, fuel sensor - will your new fuel pump be powered by the existing FI relay. Are you planning on removing the Warrior built in pre-start interlocks such as kickstand up, clutch interlock, neutral switch etc.
I assume you plan to retain the ECU to trigger the ignition coils so you need the CPS for sure. Powering the fuel pump separately will allow you more independence imo.
good luck