Bonneville Fuel Injection - Page 2 - Triumph Forum: Triumph Rat Motorcycle Forums
Air Cooled Twins Talk Discussion of Hinckley Triumph Twin related matters and topics.

LinkBack Thread Tools Display Modes
post #11 of 34 (permalink) Old 02-27-2006, 06:48 AM
Formula Extreme
Senior Member
Join Date: Dec 2005
Location: Austin
Posts: 537
Thanks for the explanation, Pete. Never had a bike with a FI and I sort of like playing with a choke.

I'm waiting for the Hayes (sp?) service manual to come out. The local Triumph service dept told me that the bonnie carbs are pretty bullet-proof and there is no need to know how to fix them. Many years ago when I rode a beemer a LOT, once in a while I cleaned a clog in the carbs. At least that is how I remember it.

Do you think there is a need to know how to work on the bonnie type carbs given the chance that something can go bad with them?
black-bonnie is offline  
Sponsored Links
post #12 of 34 (permalink) Old 02-27-2006, 07:20 AM
Senior Member
Join Date: Jun 2005
Location: Norfolk, England
Posts: 275
Black-bonnie -

Any fuel metering instrument (carb or FI) will be suceptible to malfunction or damage from matter contained in the fuel. Modern systems are protected by filters, more so for FI because the small valves and nozzles are more sensetive to contaminants.
Carbs are no more than a collection of metering jets and a few valves. A sensible, systematic approach should allow anyone to strip and rebuild any carb. FI hardware needs to be assembled in a super-clean environment. Electronic controls are mostly completely unservicable.
I have carried out and witnessed repairs to carbs and points ignition systems using a variety of materials including super-glue, road dirt, condoms, rubber bands and electrical tape (essential!). I doubt whether any of these would have been possible with electronic systems.
I can appreciate that the modern electronic systems are more reliable, but at the cost of user adaptability. I can see a future in which we will be unable to change exhausts, airboxes, gear ratios, etc. because they will fall outside the parameters of the on board computer, which will then doubtless contatc the licensing authority to tell them your bike is no longer legal! Some car manufacturers already have systems which keep track of the engine behaviour of vehicles and contact the dealer when service is due. Scary stuff!



Do as you will, but harm none.
Pete_Twizz is offline  
post #13 of 34 (permalink) Old 02-27-2006, 08:32 AM
World SuperBike
Senior Member
Join Date: Dec 2004
Location: Stockton California
Posts: 2,472
Make mine injected, FUEL INJECTED!

Triumph's fuel injection has been been recognized as offering darn near the smoothest and most seamless delivery of fuel in the motorcycle world! For some reason, it seems always to be mentioned in reviews of the new Triumphs.

I live at sea level, but some of the best riding can be had at elevated levels in the foothills. Spend a Little more time in the saddle, and you're in some gorgeous scenery at 8,000 feet. Go over the pass, and you end up at 12,000 feet! From the Central Valley of California, we do it all the time.......

Fuel injection adjusts accordingly, it's the best!

If there is any drawback, it's for the folk who like to constantly tinker with their machines changing pipes, messing with jetting, etc.

Yeah, time to get with the times......

- 'Rider' -

Click here for a view of my Member's Album.
FattRat is offline  
post #14 of 34 (permalink) Old 02-27-2006, 12:32 PM
Formula Extreme
Senior Member
Join Date: Dec 2005
Location: Austin
Posts: 537
Pat and Pete, you both bring up some very good points and I’m learning. So I will get to know how to do some basic repairs to the carbs. Not good as you, Pete, but some basics.

Since I don’t see a day where I will be riding at very high elevations and carbs have been serving me good since my mileage is 50 mpg highway and I’m not looking for scary acceleration, I’m happy with what I have. I about go insane when my computer has electronic problems and I’ve had it happen to cars too, so just keeping things basic is ok by me.

Again, thanks for taking the time trying to inform others less knowledgeable.
black-bonnie is offline  
post #15 of 34 (permalink) Old 02-27-2006, 03:28 PM
Main Motorcycle: Royal Enfield Electra
Senior Member
Join Date: Apr 2004
Location: france
Posts: 970
Other Motorcycle: 2003 thunderbird
On 2006-02-27 03:32, Pete_Twizz wrote:
Personally, I still like things that I can fix at the roadside with string and chewing gum!

Amen to that

A wise man learns from his mistakes..
A genius learns from other peoples mistakes.
panda is offline  
post #16 of 34 (permalink) Old 02-27-2006, 03:54 PM
Grand Prix 500
Main Motorcycle: 09Triumph Street Triple
Senior Member
Join Date: Mar 2004
Location: Northern California
Posts: 111
Other Motorcycle: 06Triumph Bonneville T100
Fuel Injection is great when it works well. On my 2002 955i Daytona it was never perfect. It was hard to ride around town smoothly as the on/off throttle response was jerky. It was also a bit wooly on a lightly opened throttle . On my 2004 Speed Triple the fuel injection was perfect no matter what the weather, altitude or situation.

Knowing Triumph the first years FI Bonneviles will probably have a pretty rough FI map to begin with but they should get better with time. How about a nice fuel injected 100HP Speed Twin
Strontium is offline  
post #17 of 34 (permalink) Old 02-27-2006, 04:16 PM
Team Owner
Main Motorcycle: '08 Moto Guzzi 1200 Sport
Senior Member
ohiorider's Avatar
Join Date: May 2005
Location: Hudson, Ohio - USA
Posts: 5,519
Other Motorcycle: 2012 Griso - SOLD
Extra Motorcycle: 1991 BMW R100GS
If done correctly by Triumph, fuel injection should be fine. After riding BMWs with FI for 18 years, here's a few things I experienced:
a. the original K100 Series - mine was an '85 model with Bosch LE-Jetronic FI worked seamlessly. It utilized a mass air sensor, open loop system, that didn't care if you installed a different pipe, or even if you installed a turbo. It would compensate for it.
b. later Bosch Motronic FI systems used on the Boxer twins tended to 'hunt' when running in traffic at, say, 3000rpm in a lower gear. The magazines called it 'surging'. Rather distracting, and it took BMW several years to resolve.
c. Motronic systems were 'mapped' systems, and did not adjust fuel quantity based on readings from a mass flow meter, so if you made radical intake and exhaust changes, the system did not compensate for the better breathing, and probably ran lean. Most aftermarket exhaust manufacturers then began marketing exhaust systems that didn't require a new remapped ECU chip.
d. Some FI systems require smoother throttle input because, unlike with our Keihin carbs, there's no mechanical delay or buffer provided by the vacuum-operated slide. You make a slight change in throttle position, it instantly changes the amount of fuel injected into the engine. On some bikes, this translates into jerky operation.
e. Ironically, when BMW participated in the Paris-Dakar races with their factory GS bikes, some of them had the FI removed, and replaced with huge Bing CV carburetors.

GBNF: 03 T100 Luc Org and Silv: 122/42 jets, TORs, 18T, UNI filter, no AI, Polaris bellmouth, Metz 880 tires, Prog. 440 shocks (105/150 springs), 11-1124 frk springs, Thrux frk caps, gaiters, MotoTwin bars, 6024 lamp, htd grips, 12v outlet.
ohiorider is offline  
post #18 of 34 (permalink) Old 02-27-2006, 06:01 PM
Pole Position
Senior Member
Join Date: Jun 2005
Location: Stuart Fl
Posts: 3,753
Send a message via AIM to CAPTDON
Fuel injection & catalictic converters & o2 sensors are thi thing of the future 07 We all know what happenned to VW & Porsche w the same combo I see air cooled engines becomming a thing of the past I now guess we all own classics!! I wont part w/ mine!!!!

CAPTDON is offline  
post #19 of 34 (permalink) Old 02-27-2006, 10:15 PM
Senior Member
Join Date: Mar 2005
Location: Houston
Posts: 1,142
How do you think this will effect the value of our carbed bikes?

and since no one else has said it yet.... I guess Triumph needs to lose a few pounds and is finally saying no to "carbs". :-D :hammer: kit: :roll:

2009 Bonneville
d2mini is offline  
post #20 of 34 (permalink) Old 02-28-2006, 12:19 AM
Supersport 600
Senior Member
Join Date: Oct 2004
Location: Novato, Ca
Posts: 159
Well done system, mass air flow or mapped, will in the end be superior to carbs. Mapped systems may require new maps, either to fix flaws or compensate for tuning mods. Hey, that's a few minutes working on a laptop vs hours fiddling with pilot, main, and needles. The big issue is shops getting access to the ignition and FI modules (ECUs) to reprogram.

Ooooops, that voids the warranty

Ride fast, ride safe
ChuckBecker is offline  
Sponsored Links

Quick Reply
All posts must adhere to Forum Rules

Register Now

In order to be able to post messages on the Triumph Forum: Triumph Rat Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter your valid email address, that can receive an automated confirmation message. Otherwise, you won't be able to gain full access.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuel Injection jtarp Air Cooled Twins Technical Talk 14 07-03-2007 07:18 AM
Fuel injection bikerboy Air Cooled Twins Talk 9 06-01-2007 10:56 PM
fuel injection? indy288 Air Cooled Twins Technical Talk 2 10-22-2006 07:37 PM
Fuel Injection Moke Air Cooled Twins Talk 5 03-29-2006 12:46 PM
fuel injection? ocelot Maintenance & Workshop Talk 0 07-18-2005 04:09 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On

For the best viewing experience please update your browser to Google Chrome