Carb Sync

[chapindad]

I just saw Andy's write up on the carbs and it has embolden me to sync my carbs in a few weeks.  I am sure they need it badly.  I plan to buy the sync tool from RPM.  

First:

Can this be done just with removing the gas tank? And how do I provide gas?

Second:

I saw where the sync screws are and looks like I just need a long flat head.  Correct?

Third:

Where do I plug up the sync tool too?

Ask a side note.  When I last looked at my carbs the four screws that hold on the tops diaphragm looks like they where brass and stripped out.  Should I drill them out and replace them?

Thanks again in advance.  The next project starts.  

[Fudge]

OK I'll take a stab at this one:

First - remove the tank, but leave the hoses connected.  Rest the tank on the seat with the front facing the rear of the bike.  I lay down a cloth and make sure it's secure, but it lays there nicely for a carb sync.

Second - sync screws are clearly visible between the carbs.  I forget the order of which carb numbers to sync first, I'll let someone else chime in.

Third - there are 4 vacuum nipples facing up on the intake runners that are very obvious.  Remove them and connect the sync tool.

Side note - personally I wouldn't touch them unless I had too.  I've used small vice grips to take those screws out because the screw heads are soft.  Replace them with better quality screws if you do take them out.

Good luck.

[carsick]

The tank flip only seems to work on fuel pump bikes, the earlier ones had less slack in the line and the vacuum hose to the petcock would need extending. A small plastic mower tank works good, probably free at your local small engine repair shop.

[Pat Conlon]

They have gone up in price.  IIRC mine only cost $38-39.00:  http://cgi.ebay.com/ebaymotors/HONDA-CB350-CB400F-CX500-CB750-CBX-GL1000-AUX-FUEL-TANK-/380348212983?pt=Motorcycles_Parts_Accessories&hash=item588e8526f7

[movenon]

another idea, get an old lawn mower gas tank and rig it. Don't start a fire....... Be safe

[racerrad8]

They have gone up in price.  IIRC mine only cost $38-39.00:  http://cgi.ebay.com/ebaymotors/HONDA-CB350-CB400F-CX500-CB750-CBX-GL1000-AUX-FUEL-TANK-/380348212983?pt=Motorcycles_Parts_Accessories&hash

If there is a need & interest I can add a small auxiliary tank like that to my inventory as well. I will get some prices tomorrow.

Randy - RPM

[FJ Flyer]

I picked up a Motion Pro tank a while back that works well.

[Arnie]

You don't need to run the engine for 1/2 hr to sync the carbs.  I use a 60cc syringe (disposable veterinary hypodermic) with a tube on the tip (no needle) and tie it with a wire to the handlebar.  Costs maybe $3.00 at any medical or laboratory supply house.  Gives you about 5min run time at idle.

Cheers,
Arnie  (cheapskate)

[Dan Filetti]

Pretty sure #3 (from left to right) is the fixed plate -no adjustment.  The other three must be adjusted to it.

Cheers!

Dan

[chapindad]

You don't need to run the engine for 1/2 hr to sync the carbs.  I use a 60cc syringe (disposable veterinary hypodermic) with a tube on the tip (no needle) and tie it with a wire to the handlebar.  Costs maybe $3.00 at any medical or laboratory supply house.  Gives you about 5min run time at idle.

Cheers,
Arnie  (cheapskate)

Now that is a great idea.

[Arnie]

Dan, you've been playing with those Suzooks too long :-)

On the FJ you get 1 & 2 balanced with each other, then balance 3 & 4 to each other and finally balance the 1/2 to the 3/4 sets.
There are only 3 adjusting screws.

Arnie

Pretty sure #3 (from left to right) is the fixed plate -no adjustment.  The other three must be adjusted to it.

Cheers!

Dan

[Kurt J]

Arnie is correct.
Number 1 carb is fixed or set. The other 3 need to be set to number 1 carb.

[markfj]

another idea, get an old lawn mower gas tank and rig it. Don't start a fire....... Be safe

I use a an old tank from a weed whacker.  It's clear and easy to hang.  I also ran hose and a shutoff.  But the syringe idea is a good one.  You really don't use much fuel doing a sync.  You can get epoxy syringes just about at any hardware store for next to nothing. 

[Scooterbob]

another idea, get an old lawn mower gas tank and rig it. Don't start a fire....... Be safe

I use a an old tank from a weed whacker.  It's clear and easy to hang.  I also ran hose and a shutoff.  But the syringe idea is a good one.  You really don't use much fuel doing a sync.  You can get epoxy syringes just about at any hardware store for next to nothing. 

I ended up using a Dawn Dishwashing Soap bottle.  Duct taped a hanger on the outsided of it, and drilled the cap for a tight fit around the clear fuel hose.  Was cheap and on hand at the time.  Worked perfect.

[weymouth399]

I used a 20oz plastic coke bottle with a  80/90 cap on top, stuck right in the fuel line pin hole on the other end. Worked great.

Bob W