Carb Sync restrictors - Honda Shadow Forums : Shadow Motorcycle Forum

guaterider · 02-02-2009, 04:37 PM

Were can the restrictors be purchased for the carb sync. ???
I do have the adapters (the metal brake line pieces), but the restrictor is a mystery as to where to find it. Also, where does it go in the manometer exactly.
Thanks

MarkC · 02-02-2009, 06:12 PM

They go one each where the tubing connects to the adapters!
What are they? Nothing more than ANYTHING that reduces the inside diameter of the tubing at one point to VERY SMALL! like the size of one of those little red spray nozzles on a can of penetrating oil.

What I did was I made them by inserting smaller pieces of tubing inside one another (about two inches long) until it was reduced down to where the little red spray nozzle would fit into it. Then, I just took it and cut it in half, slipped the restricters one each in the end of of manometer tubing, then I just connected another short piece of tubing on the other end of the restricters (I used vacuum hose from an auto parts store for this piece) and bingo! restricters!

The best tubing to use at the manometer to adapter connection is vacuum hose! it takes the heat a little better (well a lot better)
If I remember right the last to pieces of the restricters I used was an ink pen straw from a Bic ink pen, then I fitted the red spray nozzle inside that.
MarkC

SHADOW 1100T · 02-03-2009, 01:56 AM

I just used a small piece of wood carved down to fit tightly with a very small groove carved in one side.

MarkC · 02-03-2009, 04:02 AM

If you make OR buy something for the adapters I would keep in mine that when your done the opening orfice of both should be the SAME! the whole idea is to balance the carburetors's.
MarkC

PainterD · 02-03-2009, 04:42 AM

I never used the restrictors in my homemade synchronizer and it works fine. You just have to make sure you don't use too much fluid in the system, so it doesn't get sucked into the carbs if they are way out of balance. I used transmission fluid (red) so it's easy to see.

kcr · 02-03-2009, 08:35 AM

I bought vacuum restrictors at a local auto parts store for less than $2 each. I just spliced them into the vacuum tubing and they work great.

adlowe · 02-03-2009, 09:12 AM

Quote:

Originally Posted by kcr

I bought vacuum restrictors at a local auto parts store for less than $2 each. I just spliced them into the vacuum tubing and they work great.

That's where I found them -- in blister packs at the end of an aisle. Haven't seen them in a WalMart-like store but they might even be there, too.

Cbjr · 02-03-2009, 09:51 AM

Quote:

Originally Posted by PainterD

I never used the restrictors in my homemade synchronizer and it works fine. You just have to make sure you don't use too much fluid in the system, so it doesn't get sucked into the carbs if they are way out of balance. I used transmission fluid (red) so it's easy to see.

+1 The fluid bounces a little but it's not a problem - the weight/volume of hydraulic fluid compared to mercury is very much in favor of the hydraulic fluid being many times more accurate. (A couple inches out of sync is nothing with hydraulic fluid, and you will probably be able to get to a happy middle ground that close at idle and at mid-throttle once you have completed the process.)

rat · 02-03-2009, 09:56 AM

Use old carb jets.

guaterider · 02-06-2009, 12:26 PM

I now have enough info to go for it!
Many thanks

02-02-2009, 04:37 PM	#1 (permalink)
guaterider Senior Member Join Date: Dec 2006 Posts: 122	Carb Sync restrictors Were can the restrictors be purchased for the carb sync. ??? I do have the adapters (the metal brake line pieces), but the restrictor is a mystery as to where to find it. Also, where does it go in the manometer exactly. Thanks

02-02-2009, 06:12 PM	#2 (permalink)
MarkC Senior Member Join Date: Oct 2004 Location: Huntington West Virginia Posts: 5,017	They go one each where the tubing connects to the adapters! What are they? Nothing more than ANYTHING that reduces the inside diameter of the tubing at one point to VERY SMALL! like the size of one of those little red spray nozzles on a can of penetrating oil. What I did was I made them by inserting smaller pieces of tubing inside one another (about two inches long) until it was reduced down to where the little red spray nozzle would fit into it. Then, I just took it and cut it in half, slipped the restricters one each in the end of of manometer tubing, then I just connected another short piece of tubing on the other end of the restricters (I used vacuum hose from an auto parts store for this piece) and bingo! restricters! The best tubing to use at the manometer to adapter connection is vacuum hose! it takes the heat a little better (well a lot better) If I remember right the last to pieces of the restricters I used was an ink pen straw from a Bic ink pen, then I fitted the red spray nozzle inside that. MarkC __________________ #27 in W.M.R

02-03-2009, 01:56 AM	#3 (permalink)
SHADOW 1100T Senior Member Join Date: May 2007 Location: LEAVENWORTH WASHINGTON Posts: 5,303	I just used a small piece of wood carved down to fit tightly with a very small groove carved in one side. __________________ Ted

02-03-2009, 04:42 AM	#5 (permalink)
PainterD Senior Member Join Date: Jan 2004 Location: Central, Minnesota Posts: 7,530	I never used the restrictors in my homemade synchronizer and it works fine. You just have to make sure you don't use too much fluid in the system, so it doesn't get sucked into the carbs if they are way out of balance. I used transmission fluid (red) so it's easy to see. __________________

02-03-2009, 09:56 AM	#9 (permalink)
rat Senior Member Join Date: Oct 2005 Posts: 4,107	Use old carb jets. __________________ Later, folks.

02-03-2009, 04:02 AM	#4 (permalink)
MarkC Senior Member Join Date: Oct 2004 Location: Huntington West Virginia Posts: 5,017	If you make OR buy something for the adapters I would keep in mine that when your done the opening orfice of both should be the SAME! the whole idea is to balance the carburetors's. MarkC

02-03-2009, 08:35 AM	#6 (permalink)
kcr Senior Member Join Date: Jun 2006 Location: Raytown, MO Posts: 258	I bought vacuum restrictors at a local auto parts store for less than $2 each. I just spliced them into the vacuum tubing and they work great.

02-06-2009, 12:26 PM	#10 (permalink)
guaterider Senior Member Join Date: Dec 2006 Posts: 122	Thanks for the info! I now have enough info to go for it! Many thanks

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