Bye Bye Fuel Injection

Garry H · Apr 9, 2011

Bye Bye Fuel Injection and good riddance :hammer

I have just converted my 1100GS to carburetors and fair play what a difference
I have never been 100% happy with the way it ran ever since i first got it
But like everythink else about the bike
It now pulls cleanly from 25 MPH in top
You can ride it at walking pace in first without all the horrible snatching it used to have
It also seems to go better as well :augie

Some one must have rebuilt my gearbox when i was not looking cuz the gear change is so much smoother too

Infact it now rides like a big Airhead and thats fine by me

Here's a few pics

The carbs fit on pretty well and look good too
I did a few mods to improve the fit
I made 2 spacer plates to move the carbs back a bit to clear the front suspension wishbone..
Otherwise you have to tip the left carb over from level to clear it

I also made 2 thin aluminium rings to step the back of the carbs up so they fit into the 1100 intake tubes properly

I have put the ECU in the bin and replaced it with a Pazon ignition

I am at the moment designing a curcit to get the oil temperature gauge working correctly again

All in all a very worth while conversion

MattW · Apr 9, 2011

Great stuff Gary :thumb2

Looks like it was always supposed to be that way.

I've read of a few people who've had Steve Scriminger convert their 1100's but it's good to read of someone DIY'ing it. There are a ton of questions I'd like to ask - I may bother you in the future

Great job.

roddy · Apr 9, 2011

I've seen a few GS with this conversion and they always look good, like the way it was supposed to be

some smart metalwork there as well

even though if I'm being honest I've never understood the need to do in the first place ?

Timolgra · Apr 9, 2011

Very nicely done Gary, shame it's not as straightforward for the 1150.

Welshman · Apr 9, 2011

Timolgra said:
Very nicely done Gary, shame it's not as straightforward for the 1150.

Sorry to ask, but the engines are very similar, whats the big difference 110 to 1150? :confused:

Stewart H · Apr 9, 2011

A very neat job :thumb2

I was lusting after this conversion last year when Kenny had his done, but being a tightwad the DIY route is far more attractive.

blues_bleu · Apr 9, 2011

hey gary, i have got something to check out with you regards to the convertion.
i cannot seem to PM you, will you be able to email me (blues_bleu@yahoo.com.sg)
thanks alot!!!!

derby dave · Apr 9, 2011

Gary that is a great conversion being an engineer i appreciate the time and effort involved

Garry H · Apr 10, 2011

Been out for a 250 mile ride today for a good test
The bike is totally transformed
The power delivery is now completly snatch free in any gear
The amount of gear changes you need to do is dramatically reduced
It pulls like a train and is smoother everywhere
Fuel economy seems about the same too
This is one of the best mods i have done for ages

(RIP) Kaister · Apr 11, 2011

sounds like your fuel injection was'nt set up right - my 1100 used to go down to 1000 rpm in top and pull away cleanly enough.

Nobby · Apr 11, 2011

blues_bleu said:
hey gary, i have got something to check out with you regards to the convertion.
i cannot seem to PM you, will you be able to email me (blues_bleu@yahoo.com.sg)
thanks alot!!!!

Pay your money you tight git

Kenny · Apr 11, 2011

Superb Gary...and as I've always said, an 'airhead on steroids'

Excellent engineering btw :clap

( My engineering tools are a bastard file and a paint scraper

)
Definately one of the best mods that can be done to an 1100 :thumb2

Garry H · Apr 17, 2011

Oil temp gauge circuit now sorted installed and works fine

Went for a spin today with a mate on his new toy..
And what a beauty she is :drool

Deleted account 231002001 · Apr 17, 2011

Very nice job.

For those who aren't as capable as you, how much does this cost to get Steve Scriminger to do it?

MattW · Apr 18, 2011

Garry H said:
Oil temp gauge circuit now sorted installed and works fine

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Nice one Garry - did you use a microcontroller in the circuit or is it all analogue?

cheers
Matt

Kenny · Apr 18, 2011

Gary, How did you get the oil temp guage to work...Sriminger was/is still working this out !! Be great to get mine up and showing as well :thumb2

Incidently, Scriminger charges £250 + vat for labour

Garry H · Apr 18, 2011

Pm's replied to

To be honest sorting the temp gauge out took me longer than fitting the rest of the kit...
I am going to make a couple more to check the circuit out on a couple of other bikes ( because i calibrated mine for my bike ) and check it works ok
( i see no reason why it should not )...And take it from there

Garry H · Jun 21, 2011

Just back from a 4500 mile ride down to Albania and back

The bike ran spot on from sea level to about 7000 feet

But over 8000 feet it was a tad on the rich side.. But still perfectly acceptable

My oil temperature gauge mod worked perfect

A pleasure to ride on gravel roads

The only slight problem i had was when low on fuel a couple of times going up long steep inclines the syphon from the tank to the carbs was lost :blast

Just like running out of fuel..Pull over and blow down the breather tube to get the fuel flowing again

So the next mod is to fit a low pressure pump or use 2 feeds to the carbs and 2 taps like a airhead
Fuel economy was excellent i was in no rush and was getting not far short of 60 mpg
IMHO a well worthwhile mod

Kenny · Jun 21, 2011

Hi Gary,

Hmmm...seems like the use of the OE bmw filter is at fault by holding an air lock when fuel gets low. I 'ran out of fuel' when recently balancing the carbs whilst forgetting to turn on the fuel tap :blast

Even removing the float bowls and filling them with petrol AND blowing into tank still proved fruitless until I physically poured petrol in to fill up the actual filter, then all was well.
I've just bought a larger narrower ( 8mm fuel pipe) plastic fuel filter ( will fit 1000cc Jap bikes etc )which hopefully ( if I can fit it vertically ) will sort out this minor blemish on an otherwise thoroughley recommended conversion.

Looks like you had a great holiday :thumb2

MattW · Jun 21, 2011

Nice one Garry :thumb2

Bye Bye Fuel Injection

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