![Reply](https://www.horizonsunlimited.com/hubb/images/buttons/reply.gif) |
|
![Old](https://www.horizonsunlimited.com/hubb/images/statusicon/post_old.gif)
4 Jun 2008
|
Registered Users
HUBB regular
|
|
Join Date: Nov 2007
Posts: 22
|
|
choke problems?
hi all,
i have a 93 r100r and am having some troubles with the choke on start up.
if i try to start the bike with full or half choke when it is stone cold in any conditions it just won't start. it feels like it is getting choked too much.
the bike starts fine with no choke and a bit of throttle, but i have to hold the throttle on to stop it from stalling till the bike warms up.
when the bike is running but still cold and i put any choke on it stalls straight away.
i have checked that the choke is closing properly and have lubed the cables. i also experimented by manually applying the choke on each carby one side at a time, the same thing happened.
does anyone know what the problem could be?
cheers,
chris
|
![Old](https://www.horizonsunlimited.com/hubb/images/statusicon/post_old.gif)
4 Jun 2008
|
![AliBaba's Avatar](https://www.horizonsunlimited.com/hubb/images/avatars/Female32.gif) |
Registered Users
Veteran HUBBer
|
|
Join Date: Apr 2001
Location: Norway
Posts: 1,379
|
|
You could open and clean the choke assembly (four screws towards the engine). Be sure to not mix up the parts between the carbs.
Before you do that you should check the gasket on your float housing, if it’s not sealing the einrichtner will not be able to suck petrol but it will suck air and make the mix leaner. You should also check that passage to the circular hole is open (in the float housing)
|
![Old](https://www.horizonsunlimited.com/hubb/images/statusicon/post_old.gif)
6 Oct 2008
|
Registered Users
HUBB regular
|
|
Join Date: Nov 2007
Posts: 22
|
|
i have now rebuilt the carbs replacing the gaskets, o-rings and diaphrams and cleaning with carby cleaner. however i am still getting the same problem on start up.
anyone got any ideas?
|
![Old](https://www.horizonsunlimited.com/hubb/images/statusicon/post_old.gif)
6 Oct 2008
|
![electric_monk's Avatar](https://www.horizonsunlimited.com/hubb/customavatars/avatar11163_1.gif) |
Contributing Member
Veteran HUBBer
|
|
Join Date: Aug 2001
Location: Waterford, Ireland
Posts: 309
|
|
I would leave well enough alone and be thankful that it starts and that you know the knack. If it ain't broke don't fix it.
__________________
The electric monk always has faith.
|
![Old](https://www.horizonsunlimited.com/hubb/images/statusicon/post_old.gif)
6 Oct 2008
|
![AliBaba's Avatar](https://www.horizonsunlimited.com/hubb/images/avatars/Female32.gif) |
Registered Users
Veteran HUBBer
|
|
Join Date: Apr 2001
Location: Norway
Posts: 1,379
|
|
What happens if you apply choke when the engine is hot?
|
![Old](https://www.horizonsunlimited.com/hubb/images/statusicon/post_old.gif)
6 Oct 2008
|
Registered Users
Veteran HUBBer
|
|
Join Date: Feb 2006
Posts: 1,598
|
|
There are two ways of putting the choke assemblies on the carbs. Needless to say only one way is correct. Also it is possible someone mixed up the two choke assemblies. This is easy to do. as a final note, probably not needed, the lever pulls the chokes on. lever closed equals chokes off ( but only if they are fitted correctly.)
You need to physically clear the little jet that feeds the choke assembly. compressed air is not enough.
|
![Old](https://www.horizonsunlimited.com/hubb/images/statusicon/post_old.gif)
7 Oct 2008
|
Contributing Member
Veteran HUBBer
|
|
Join Date: Jul 2002
Location: Sydney, NSW, Australia
Posts: 1,362
|
|
It would help, possibly, to know where you are .. if it is over say 30C then the choke may not be needed ...
It should be possible to apply say 1/10 choke and see if the idle is ok when cold ... if even that kills the enging I'd be very carefully checking the chokes have not been swapped from one side to teh otehr .. or simply put back together wrong .. possibly by the previous owner..
We're all assumeing the thing is standard..
__________________
---
Regards Frank Warner
motorcycles BMW R80 G/S 1981, BMW K11LT 1993, BMW K75 G/S
|
![Old](https://www.horizonsunlimited.com/hubb/images/statusicon/post_old.gif)
7 Oct 2008
|
Registered Users
HUBB regular
|
|
Join Date: Nov 2007
Posts: 22
|
|
the bike is standard apart from having a k and n air filter, and the problem existed before i changed the filter.
i bought the bike with 15000ks in close to perfect condition about 6 months ago, it has now travelled 40000ks.
it appears the problem is worst when it is very cold, when it is below 10 deg C i sometimes have to roll start the bike.
i have changed the battery and plugs.
|
![Old](https://www.horizonsunlimited.com/hubb/images/statusicon/post_old.gif)
7 Oct 2008
|
Contributing Member
Veteran HUBBer
|
|
Join Date: Jul 2002
Location: Sydney, NSW, Australia
Posts: 1,362
|
|
OK - so we have
Standard bike (with K&N air filter - but was doing teh same before fitment)
New battery
New plugs
Reluctant to start with choke - worse below 10C
Dies if either left or right choke (or both) activated when cold
Easy to start with a little throttle ..
----------------------
Did it always do this (under your ownership)?
Are you getting reasonable fuel economy? (bike is not running rich - thus choke can flood engine)
I think it is the choke circuit .. wrong assembly of components ..
__________________
---
Regards Frank Warner
motorcycles BMW R80 G/S 1981, BMW K11LT 1993, BMW K75 G/S
|
![Old](https://www.horizonsunlimited.com/hubb/images/statusicon/post_old.gif)
7 Oct 2008
|
Registered Users
HUBB regular
|
|
Join Date: Nov 2007
Posts: 22
|
|
it starts easy with throttle at average temperatures, say around 20, but below that it is even hard to start with throttle.
my fuel economy is around 6L/100kms, but goes to about 7 in heavy traffic. do you think that is about right?
|
![Old](https://www.horizonsunlimited.com/hubb/images/statusicon/post_old.gif)
7 Oct 2008
|
Registered Users
Veteran HUBBer
|
|
Join Date: Feb 2006
Posts: 1,598
|
|
Quote:
Originally Posted by cenn8310
it starts easy with throttle at average temperatures, say around 20, but below that it is even hard to start with throttle.
my fuel economy is around 6L/100kms, but goes to about 7 in heavy traffic. do you think that is about right?
|
Your mpg is in the ball park.. I still think you need to sort out th chokes, What worries me ii if both are wrong, then the most likely cause is they have been swapped over. Why the change to K&N filter ???
|
![Old](https://www.horizonsunlimited.com/hubb/images/statusicon/post_old.gif)
7 Oct 2008
|
Registered Users
Veteran HUBBer
|
|
Join Date: May 2006
Location: Bribie Island Australia
Posts: 678
|
|
One of our R65s pulled a choke cable through the lever on the handle bar. This meant that one choke was not closing at all, took quite a lot of hunting to find as the choke cables appeared to be ok.
Try and work through the logic of why it wont start.
Choke closed means fuel should be rich - too rich and it wont start as there is too much fuel and not enough air. Is there a strong smell of fuel coming from the exhausts when the chokes are closed? Yes = chokes are working, No = chokes are not closing.
What about the carb jets? They do wear, but 40000kms - maybe need to rejet the carbs with new needles, jets and seals.
Have you fiddled with the electronic ignition timing module? What about the sensor for the timing? I'm not sure if there are any DIY tests for the electronic ignition, maybe someone else can help on that.
|
![Old](https://www.horizonsunlimited.com/hubb/images/statusicon/post_old.gif)
8 Oct 2008
|
Registered Users
Veteran HUBBer
|
|
Join Date: Jun 2005
Location: Cape Town / South Africa
Posts: 207
|
|
The Bing carburettor does not in fact have a choke!
A choke does exactly what the name says, it chokes the air and in the process enriches the mixture but the amount of fuel flowing through is still the same.
What is fitted to the Bing carbs is in fact an enrichner and it allows more fuel through the carb but the airflow stays the same in this way enriching the mixture for starting and idling of a cold engine. This have only one major drawback, as soon as you open the throttle you allow more air trough the carb leaning out the mixture again.
The secret of starting the Bing carb with the choke on is that the throttle should stay closed till the motor start, as both carbs start firing you can add a little throttle for some seconds after which the bike should idle with the choke on.
I must add that Bing carbs are very temperamental when it comes to cold starting and it always vary from one bike to the next, but it takes only about half a mile till you can switch of the choke and if they are well maintained and balanced they will run like a dream.
There will be a L for Left and R for right stamped inside both the enrichners so it will be easy to identify which should go where.
If you took them apart to fit new O-rings and are not sure that they are assembled the correct way around I can post some pics here to illustrate what it should look like.
|
![Old](https://www.horizonsunlimited.com/hubb/images/statusicon/post_old.gif)
9 Oct 2008
|
Registered Users
New on the HUBB
|
|
Join Date: May 2008
Location: London
Posts: 14
|
|
Quote:
Originally Posted by gsworkshop
The Bing carburettor does not in fact have a choke!
What is fitted to the Bing carbs is in fact an enrichner .
|
Right, forget the choke problem, we're now looking for something completely different, an enrichner problem
|
![Old](https://www.horizonsunlimited.com/hubb/images/statusicon/post_old.gif)
10 Oct 2008
|
Contributing Member
Veteran HUBBer
|
|
Join Date: Jul 2002
Location: Sydney, NSW, Australia
Posts: 1,362
|
|
Quote:
Originally Posted by steptoe
Right, forget the choke problem, we're now looking for something completely different, an enrichner problem ![RoFL](https://www.horizonsunlimited.com/hubb/images/smilies/rofl.gif)
|
Reminds more of a song from WW2 .. about making a thing-a-ma-bob that turns the whatchamacallit?etc ..
BMW operators manuals calls it a choke - so the average user calles it a 'choke' ..
It is better to be nearly right and understandable
than to be academically accurate and incomprenhensible.
Author unknown
----------------
Think we are all agreed something is worng with the assembly of it .. left to right swap or whatever .. need close examination and comparision with diagrams/photos of a good one..
__________________
---
Regards Frank Warner
motorcycles BMW R80 G/S 1981, BMW K11LT 1993, BMW K75 G/S
|
Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
Check the RAW segments; Grant, your HU host is on every month!
Episodes below to listen to while you, err, pretend to do something or other...
2020 Edition of Chris Scott's Adventure Motorcycling Handbook.
"Ultimate global guide for red-blooded bikers planning overseas exploration. Covers choice & preparation of best bike, shipping overseas, baggage design, riding techniques, travel health, visas, documentation, safety and useful addresses." Recommended. (Grant)
![Ripcord Rescue Travel Insurance.](/stuff/ripcord/ripcord-logo-250.jpg)
Ripcord Rescue Travel Insurance™ combines into a single integrated program the best evacuation and rescue with the premier travel insurance coverages designed for adventurers.
Led by special operations veterans, Stanford Medicine affiliated physicians, paramedics and other travel experts, Ripcord is perfect for adventure seekers, climbers, skiers, sports enthusiasts, hunters, international travelers, humanitarian efforts, expeditions and more.
Ripcord travel protection is now available for ALL nationalities, and travel is covered on motorcycles of all sizes!
What others say about HU...
"This site is the BIBLE for international bike travelers." Greg, Australia
"Thank you! The web site, The travels, The insight, The inspiration, Everything, just thanks." Colin, UK
"My friend and I are planning a trip from Singapore to England... We found (the HU) site invaluable as an aid to planning and have based a lot of our purchases (bikes, riding gear, etc.) on what we have learned from this site." Phil, Australia
"I for one always had an adventurous spirit, but you and Susan lit the fire for my trip and I'll be forever grateful for what you two do to inspire others to just do it." Brent, USA
"Your website is a mecca of valuable information and the (video) series is informative, entertaining, and inspiring!" Jennifer, Canada
"Your worldwide organisation and events are the Go To places to for all serious touring and aspiring touring bikers." Trevor, South Africa
"This is the answer to all my questions." Haydn, Australia
"Keep going the excellent work you are doing for Horizons Unlimited - I love it!" Thomas, Germany
Lots more comments here!
![Five books by Graham Field!](/stuff/grahamfield/graham-field-2021-280.jpg)
Diaries of a compulsive traveller
by Graham Field
Book, eBook, Audiobook
"A compelling, honest, inspiring and entertaining writing style with a built-in feel-good factor" Get them NOW from the authors' website and Amazon.com, Amazon.ca, Amazon.co.uk.
Back Road Map Books and Backroad GPS Maps for all of Canada - a must have!
New to Horizons Unlimited?
New to motorcycle travelling? New to the HU site? Confused? Too many options? It's really very simple - just 4 easy steps!
Horizons Unlimited was founded in 1997 by Grant and Susan Johnson following their journey around the world on a BMW R80G/S.
Read more about Grant & Susan's story
Membership - help keep us going!
Horizons Unlimited is not a big multi-national company, just two people who love motorcycle travel and have grown what started as a hobby in 1997 into a full time job (usually 8-10 hours per day and 7 days a week) and a labour of love. To keep it going and a roof over our heads, we run events all over the world with the help of volunteers; we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships.
You don't have to be a Member to come to an HU meeting, access the website, or ask questions on the HUBB. What you get for your membership contribution is our sincere gratitude, good karma and knowing that you're helping to keep the motorcycle travel dream alive. Contributing Members and Gold Members do get additional features on the HUBB. Here's a list of all the Member benefits on the HUBB.
|
|
|