XJ750 D - EFI

I think we should use the metric system as well, it is a bit easier, but whatever. On the flip side, to make things a little easier for the SAE folks, if you see a speed limit in KM, simply multiply by 6 and drop the last number. i.e. 50kph x 6 = 30mph (last number dropped).

 

Instead of measuring how many litres it takes, which is weird, it is easier for us to think in terms of distance you can go. 100km feels arbitrary, some random distance... A single gallon, or litre, whatever, makes more sense mentally to use.

 

UK Gallons should ALWAYS be used.. this is why i hate mpg.. is it in UK or US, the car companies never tell you.

L/100 is an easier way to calculate efficiency, than K/Litre.

Ex:

say you know your efficiency is 47mpg, that's 6L/100 or 16.6K/Litre

How much gas do you use to travel 300km?
You know right away real quick that it takes 18L
300/16.6 is a pain to calculate out.
mpg you have to convert then calc, pain in the arse.

It's just easier for us that use Km and Litres, to use L/100. mpg means nothing to me except I know 50 is good for our bikes, i'd have to convert my L/100 to know if it's running right. Or just know the L/100 for good economy.

I guess it comes down to the base10 system, L/100K is a base 10 measurement.

How many gallons does it take to go 100miles? @47 mpg, you have to divide 100/47 which equals 2.18 (rounded) 2.18 isn't a nice number to look at

Ok i'm rambling now lol

 

After only 2 posts on topic, this has become a 2 page discussion thread on fuel economy and the different ways to express it. I for one would like to here more about this model XJ750 D - EFI as I didn't even know it existed. EFI on these XJ's is/would be a sweet enhancement. Now knowing that Yamaha produced one of the the same engine design as that which I own and did so with EFI multiport fuel induction, I am highly intrigued.

I want to know more. Are there any design differences between say the head on the 82 XJ750 and the 84 XJ750? If not, then it would be much easier using parts off of a factory bike than engineering a setup. For instance, I have been looking at Jenvey for throttle bodies, and was going to start building an MPI rack that would "bolt up" right into the original intake boots, and then of course add the crank trigger and other needed modification. This route would be considerable more costly.

I will start researching this model more, and perhaps it might be more cost effective to acquire a parts bike and have it shipped to the US, than building a setup from scratch.

 

It would be nice to know what company manufactured those throttle bodies and if they are still available from said manufacturer. Might have to order from Japan, but it could all be worth it.
BTW, it's hard to wrap my head around Litres or Tyres, Just looks wrong. :lol:
Britain, Australia,Canada and USA, country's separated by a common language. :wink:

 

I agree. But I have been browsing around all morning, and there just doesn't seem to be a whole lot of data out there on this model. I have found some more pics, and from what I have seen, I am not real impressed with the set up of the factory fuel injection rack.