Fuel Injection on muddaboiks?? Pro's & Cons

[80-85 husky]

What is the current view in forum world on fuel injection???

I've had stuff all to do with it other than having to be real careful pulling the tank off after a bike went under in a crossing.
Lots of stress re filters and leads etc

bit like watercooling.... its perfect until there is less water in the system than needed then its totally useless .

Any gains in "performance" over an aircooler is null and void when the aircooler runs on by while you sit in a steam cloud...

is Fuel injection like this.. a gimmick foisted onto the public by keen ad men

Im keen to hear the majority concensus

[Nathan S]

It has no place on a dirt bike. Not yet anyhow.

I'm no anti-EFI Luddite - I've converted several cars to EFI.
But cars don't come with FCRs, aren't normally filled from jerrys, have much larger filters, and are rarely expected to run under water/in three feet of mud/etc.

They're getting better, but most older EFIs on bikes have abrupt throttle response, particularly at lower revs, making them much harder to ride in snotty spots.

[TooFastTim]

It has no place on a dirt bike. Not yet anyhow.

I sort of agree. My gasser trials bike has throttle response as good as if not better than the FI Ossa. So no benefit in that regard. I don't like the additional complexity but I have to admit that water cooled, disc braked  bikes are a huge improvement over the twin shocks we love. Th only benefit to FI as far as I can see, is less emissions and if that's a sacrifice we have to make to keep 2Ts alive I'm prepared to make it

[80-85 husky]

Run a good fully synthetic at 100 to 1 and the emissions (visible ones) disappear

I forgot about t he filtered fuel issues... never seen a clean jerry can that's for sure

[Lozza]

No con's all good if your a weekend trail rider on a 4T. On a 2T never unless you want to use a aftermarket ignition/injection module and burn holes in a few pistons

[Andrew L]

Spend the extra $70 odd for a spare fuel pump for the bumbag you'll be needing it along with a few fuses

[Slakewell]

Spend some time and read some info from this website.
http://www.orbeng.com.au/

You can inject air not just fuel when it's done correctly combined with the lastest electronics you could build a electric smooth 70 HP bike that could get 200+ KM from a 12 litre tank.

[pancho]

 Have a look at the Evinrude/Johnson Fict. fuel/air injection, for 2/  outboards. Interesting.
pancho.

[tony27]

Having ridden a few injected & carbed 450 enduro bikes there are advantages to the injected bikes, seriously easy starting below freezing point, no drop off in performance at altitude etc.
Never drowned 1 so have idea what they're like to dewater but would expect they should be easier due to not needing to drain the carb & clear out jets etc

[Nathan S]

No con's all good if your a weekend trail rider on a 4T.

I know several 4T owning trail riders who will disagree.

The reliability isn't there yet - crap in injectors, wiring rubbing through, dead fuel pumps, etc.
Plus the finer details of mapping for smooth, strong throttle response in all conditions is still a black art that very few have mastered (and let's be honest, plenty of car makers still haven't figured it out, over a quarter of a century after EFI became mainstream in cars).

[TooFastTim]

Interesting write up here: http://www.dirt-bike-tips-and-pics.com/the-experimental-motorcycle-association.html

[evo550]

Leave all the techno complications on the 4t's, I'm a 2t'er for no other reason than reliability and simplicity.....and did I mention power to C.C. ratio and weight ?

[BultacoMacca]

 EFI is great when it's new, but I know of a number of EFI enduro/trail bikes that have had to be towed home. You get a bike that's a few years old, has been dumped in a creek, or washed thoroughly every ride, and you start to see connector issues.  Plus any wiring rubbing as Nathan said. Not to mention TPS values seemingly changing of their own accord, without the input of owners trying to "tune" the bike to a stop with aftermarket controllers. These bikes really don't have a complex sensor system, but you still arent easily going to do much to one without the OEM Factory Diagnostics. And the old "put on the Computer to see what wrong with an EFI bike" is pretty much a crock, as all you often get is a warning of a high or low voltage problem which then has to be solved by good old mechanic's knowledge and skills anyway.