1984 FJ 1100 carburetter problems

[Vernon]

Hi there guys

I am the proud owner of a 1984 FJ 1100 and live in South Africa. Recently I have picked up problems with my bike though as it struggles to get off the marks and literraly have to " wound " or revved up before taking off. A friend told me that the diaphragms in my carburetters were torn\ damaged.

What can cause this and how available are these? Is there anone out tehre that can perhaps sell me some decent ones? Your help would really be much appreciated ,

Take care and happy biking!

Vernon

[mz_rider]

Hi there guys

I am the proud owner of a 1984 FJ 1100 and live in South Africa. Recently I have picked up problems with my bike though as it struggles to get off the marks and literraly have to " wound " or revved up before taking off. A friend told me that the diaphragms in my carburetters were torn\ damaged.

What can cause this and how available are these? Is there anone out tehre that can perhaps sell me some decent ones? Your help would really be much appreciated ,

Take care and happy biking!

Vernon

Vernon,

It is easy to check the diaphragms - remove the carb top cover, remove the spring and then the slide & diaphragm. Hold the diaphragm up to the light to check for pin holes. The diaphragm is bonded onto the slide and is made from rubberised fabric. They wear with time. On my bike the symptom was rough running a bit like the choke being left on. If you have holes there are three options:

- replace the diaphragms & slides (very expensive)
- the FJOC in the UK can replace the diaphragms (this was my fix)
- repair the diaphragm using liquid rubber - others in the group have done this.     

Another option is to buy a second hand set of carbs. I'm thinking of getting a spare set since there are lots on eBay here in the UK at about £60 ($100)

Stuart

[simi_ed]

Sounds like the standard clogged pilot jets to me.  Remove, clean (ultrasonic if possible) and reinstall.

[Travis398]

 If someone told you they were bad you should at least take them out to verify.

[Vernon]

Hi there Stuart

Thanks for at least giving me a couple of good options to look at. Your advice is much appreciated. Could you please tell me what these diaphragms cost at FJOC in the UK. Here in South Africa they are just not available and I was told by the local bike shop they would have to order these for me from Japan. Cost is about R 1 200, plus minus 120 $. This is very expensive and I would really appreciate it if you could supply me with the details of the FJOC. Alternatively, could you perhaps find out what they would cost me if I were to order directly from them?

I thank you in advance for your kind assistance and hope to hear from you real soon.

Regards

Vernon

[simi_ed]

Vernon, before you spend all that money, you really should make sure there is not any easily fixable problems, such as a plugged jet.  I've had the same problem you describe and it turned out to be a plugged pilot jet.

[andyb]

To check the carb diaphrams for tears is quite easy.  Pull the seat, pull the sidepanels, pull the tank.  Pull the airbox if so equipped, and the carbs are staring you in the face, pull the four screws that retain the little top covers and a spring will jump out at you, below is the diaphram.  Checking for tears is easy at that point.

Strikes me that it's possible that they're ripped but it's also possible that you have a vacuum leak or pilot jet plugged elsewhere, but those require a little more disassembly to get to.

[mz_rider]

Hi there Stuart

Thanks for at least giving me a couple of good options to look at. Your advice is much appreciated. Could you please tell me what these diaphragms cost at FJOC in the UK. Here in South Africa they are just not available and I was told by the local bike shop they would have to order these for me from Japan. Cost is about R 1 200, plus minus 120 $. This is very expensive and I would really appreciate it if you could supply me with the details of the FJOC. Alternatively, could you perhaps find out what they would cost me if I were to order directly from them?

I thank you in advance for your kind assistance and hope to hear from you real soon.

Regards

Vernon

Vernon,

FJOC home page:    http://fjclub.co.uk/] [url]http://fjclub.co.uk/[/url]

parts:         http://www.fjcatalogue.com/home.html] [url]http://www.fjcatalogue.com/home.html[/url]

carb parts:              http://www.fjcatalogue.com/carbs.html] [url]http://www.fjcatalogue.com/carbs.html[/url]

Check the diaphragms for pinholes before going any further.

Stuart

[mz_rider]

Vernon,

I knew I had a picture somewhere - carb diaphragm hole.



Stuart

[Vernon]

Hey there guys

Just a big thank you for all the advice with my problem. Many special thanks to you, Stuart, for the very informative photo, at least now I know exactly what to look for. A friend of mine will pull out the carbs this weekend and I'm quite eager to know what the real problem is. I shall definitely also check out the pilot jets while I am at it.

Will keep you guys informed on progress made. Hopefully, with your help, my baby willbe running smoothly again real soon. Its really nice to be part of such a caring, supportive group of guys such as yourself.

Keep it up and happy fj ---ing !!!!!!!!

Kind regards
Vernon ( from a very sunny summery South Africa )