Vilike's Carb Diaphragm topic

[Vilike]

So guys, i had to get apart all the four carbs. I have seen that all the diaphragms have holes, and/or cracks on them.
3-5 on each diaphragm.
I had to buy an another used carbs-line on sunday. I disassembled it : same trouble - all diaphragms are dead.
Now, i think these holes cannot be fixed right ? The diaphragms would be too rigid after a bonding.


Replace, clear alternative.
Okay, i have two ideas. First, i have also an old but great conditioned '88 XJ900 Seca (31A)
Could it be that the Seca has the SAME diaphragms as the FJ does ? For the first look the carbs are the same.
The second idea is that i will buy that FJOC  replacement kit, or i'll search on Ebay.

[Harvy]

Vilike........this company is in Canada I believe.......they are the cheapest I have been able to find.

http://cgi.ebay.com/ebaymotors/YAMAHA-FJ1100-FJ1200-CARB-SLIDE-DIAPHRAGM_W0QQcmdZViewItemQQitemZ130333483506QQptZMotorcyclesQ5fPartsQ5fAccessories#ht_987wt_940


I have heard of folks repairing them with spray silicon rubber, but do not have any details, sorry.

Harvy

[racerrad8]

I need to check tomorrow, but I think I can supply a brand new set of carbs for $400.00. This will be late model carbs that are fuel pump compatible.

To convert them to gravity, only the fuel inlet needle seat needs to be changed out. When you change them out, use the new o-rings that are in the new carbs.

I will followup in the morning.

Randy - RPM

[Vilike]

Allright, thanx for your replies !

Well, i found this on Ebay UK :

http://cgi.ebay.co.uk/Carburettor-Diaphragm-Yamaha-FJ1200-86-9-NEW_W0QQitemZ370267441335QQcmdZViewItemQQptZUK_Motorcycle_Parts?hash=item5635a8c8b7

I had to find some other offerings too, but there were the half of my monthly payment... 

[rktmanfj]

I've never tried this, but...

http://www.totalmotorcycle.com/BBS/archive/o_t__t_5858__cv-carb-slide-diaphragm-repair-it-works.html

Someone on one of the other FJ groups used Liquid Electrical Tape or Plasti-Dip (cut 50% with naptha, IIRC) successfully, as well.

YMMV

Randy T
Indy

[pdxfj]

I have done the liquid electrical tape fix and it works great.  Opened my carbs for the first time in about 5 years and the diaphragms still looked good.

I used a q-tip to apply the stuff to the areas that needed it.

I've never tried this, but...

http://www.totalmotorcycle.com/BBS/archive/o_t__t_5858__cv-carb-slide-diaphragm-repair-it-works.html

Someone on one of the other FJ groups used Liquid Electrical Tape or Plasti-Dip (cut 50% with naptha, IIRC) successfully, as well.

YMMV

Randy T
Indy

[Marsh White]

Someone on one of the other FJ groups used Liquid Electrical Tape or Plasti-Dip (cut 50% with naptha, IIRC) successfully, as well.

I was the one who came up with the Liquid Electrical Tape - and it works!  I have used it for small holes successfully.  I'm not sure how well it would work on tears.  As long as the tears are small it should work fine.  Every couple years I reapply.  If I were you I would give it a try.  At least it would work well enough for you to get your bike running and tuned temporarily - very easy to access and change later.

This is the stuff I used:


You can buy it here:
http://www.basspro.com/webapp/wcs/stores/servlet/Product_10151_-1_10001_39763

[racerrad8]

I need to check tomorrow, but I think I can supply a brand new set of carbs for $400.00. This will be late model carbs that are fuel pump compatible.

To convert them to gravity, only the fuel inlet needle seat needs to be changed out. When you change them out, use the new o-rings that are in the new carbs.

I will followup in the morning.

Randy - RPM

Okay, I can get new carbs for $400.00. These are brand new never have had gasoline in them. Like I said earlier, these can be changed to the gravity feed model bikes with ease. If you have dual inlets, then the carbs would have to be separated and the dual inlets installed.

If you are in need of a new set of carbs for next season, let me know. Who know they might make good Christmas gift...

Thanks, Randy - RPM

[Vilike]

Okay, thanx a lot guys. Well, i think i will try this "Liquid Electric Tape" first. If it works not, then ebay.
I am a bit less of money now, so i cannot buy carbs or other expensiver things.
Hungary slowly goes down now. Everybody suffers this "economic crisis".

So, if everything will running good, my little brother will buy my XJ900. Then i can buy carbs or something...

Sorry for the off things.

Thanx again guys !   

[thuber3040]

There are 4 new diaphrams on ebay right now with a buy it now of 274 for the set, but at that price a better investment with all new parts are those carbs at 400, if mine are shot, that will be my first big purchase!!
or maybe lectrons or keihins to eliminate the diaphram problem once and for all.

Keep us posted on what you find and come up with.

Good Luck and Welcome also !!

[TRoy]

I can get new carbs for $400.00. These are brand new never have had gasoline in them. Like I said earlier, these can be changed to the gravity feed model bikes with ease. If you have dual inlets, then the carbs would have to be separated and the dual inlets installed.

Hey Randy,  have you actually done this retrofit?  What do you do..  install the dual inlets, and replace the original center inlet with one of the extra solid crossover tubes?  Thanks. I remember this topic from a couple years ago.. and I'm sure Wade remembers it well, too.

--- In yamahafj@yahoogroups "Wade Kehner" wrote:
I had a broken float post on a carb and replaced the carb body . I
> was looking at the carb again yesterday and noticed that there is an extra inlet across from where the fuel enters the carb body. It looks like the extra one was bored out. My oringinal carb body had only 1 inlet that went all the way into the carb. Am I missing something?
> Would sealing this extra inlet solve the problem?

--- In yamahafj@yahoogroups.com, "troy_suiter" wrote:
>   .. that carb was taken from a fuel-pumped carb bank (actually off a legends car). Instead of having 2 fuel inlets between 1&2 and 3&4,  there is only one 1/4" fuel inlet between 2&3 then crossover tubes  connect the other carbs together.
> hence the extra fuel inlet on the opposite side of the carb.

[racerrad8]

Nope,
     But I will being doing it right now. I will let you know after I get done. I expect that the crossover tube removed will be the same diameter of the single inlet pipe allowing it to be installed as it's replacement.

I will advise shortly.

Randy - RPM

[racerrad8]

No problems. When the new set is broken down, one of the aluminum crossover tubes will fit in place of the center inlet fitting. The dual inlet fittings will then go in between the two outer carbs where the crossover tube was located.

As I stated before, the dual inlet system will now feed all four carbs instead of being a supply source for just the two outer carbs.

The brass needle seat will also still need to be change to the gravity acceptable orifice.

Randy - RPM

[TRoy]

No problems.  one of the aluminum crossover tubes will fit in place of the center inlet fitting. The dual inlet fittings will then go in between the two outer carbs where the crossover tube was located.

  Cool beans, THANKS!

Kookaloooo!

[RichBaker]

Someone on one of the other FJ groups used Liquid Electrical Tape or Plasti-Dip (cut 50% with naptha, IIRC) successfully, as well.

I was the one who came up with the Liquid Electrical Tape - and it works!  I have used it for small holes successfully.  I'm not sure how well it would work on tears.  As long as the tears are small it should work fine.  Every couple years I reapply.  If I were you I would give it a try.  At least it would work well enough for you to get your bike running and tuned temporarily - very easy to access and change later.

This is the stuff I used:


You can buy it here:
http://www.basspro.com/webapp/wcs/stores/servlet/Product_10151_-1_10001_39763

I've seen the same stuff at Home Depot.... I guess I better buy a can next time I see some.