Float-Sync tool

[Carl Platel]

Good evening I would like to purchase a tool to balance my floats apparently it very important I would like to buy the float sync tool but can’t seem to find them for sale
Q. Does anyone have a link to share or a tool to sell or indeed an alternative tool as I feel the factory setting method seems a little to vague I guess fine for a single carb not so ideal for a twin se up my carbs are HJG46W-R8 2802H well that’s what written on them
Cheers Carl

 

[Rob Gaskin]

Good evening I would like to purchase a tool to balance my floats apparently it very important I would like to buy the float sync tool but can’t seem to find them for sale
Q. Does anyone have a link to share or a tool to sell or indeed an alternative tool as I feel the factory setting method seems a little to vague I guess fine for a single carb not so ideal for a twin se up my carbs are HJG46W-R8 2802H well that’s what written on them
Cheers Carl

I have no experience of working on the 'Flat Top' carbs however I would just follow the 'factory setting method' accurately. You are talking about float height I assume which will determine fuel level. There isn't any 'sync' to do with floats you just set the height for each carb to work correctly. The sync is done with the airflow so each cylinder draws the same amount of air.

 

[Fairlineguy]

I’m guessing your thinking of the tool in the photo ?You can set the float height just as easy with a bit of clear plastic tube
attached to the bottom of the float chamber where the black pipe is attached .

 

[Geoff-R]

Do you mean one of these?

https://advancedautomotives.com/car...balancer-weber-dellorto-40-45-dcoe-1656-p.asp

 

[Carl Platel]

I’m guessing your thinking of the tool in the photo ?You can set the float height just as easy with a bit of clear plastic tube
attached to the bottom of the float chamber where the black pipe is attached .

That’s bloody brilliant and now you’ve pointed it out bleeding obvious thank you so very much

 

[Carl Platel]

Do you mean one of these?

https://advancedautomotives.com/car...balancer-weber-dellorto-40-45-dcoe-1656-p.asp

 

[Carl Platel]

No I was looking for a tool to help measure the level of fuel inside the float chamber but I think I’m going to need a flow meter too
Thanks for taking the time to message
Cheers Carl

 

[Carl Platel]

I have no experience of working on the 'Flat Top' carbs however I would just follow the 'factory setting method' accurately. You are talking about float height I assume which will determine fuel level. There isn't any 'sync' to do with floats you just set the height for each carb to work correctly. The sync is done with the airflow so each cylinder draws the same amount of air.

Hello Rob I’m told its very important to balance the level of fuel in the float chambers, the float sync tool shows it externally, however it’s now been brought to my attention that I can do this by attaching a clear pipe instead of the black transfer pipe and simply hold it next to the carb so simple but I didn’t think of it thanks so much for your reply happy days Carl

 

[Rob Gaskin]

Hello Rob I’m told its very important to balance the level of fuel in the float chambers, the float sync tool shows it externally, however it’s now been brought to my attention that I can do this by attaching a clear pipe instead of the black transfer pipe and simply hold it next to the carb so simple but I didn’t think of it thanks so much for your reply happy days Carl

I still don't understand the balance/sync part. The carb has an optimum fuel level irrespective of if it's on it's own or connected to other carbs.
What you are suggesting is that the level can be incorrect but as long as it's the same as the other carb i.e. both wrong it's balanced and fine?

On my Honda motorbike I have 4 carbs but I set the float adjustment individually on the bench. Yes a clear pipe to check can be 'rigged up' from the drain plug hole.
I do have a set of 4 vacumn guages to balance the air intakes/throttles. That's critical.

 

[MCBladeRun]

I think Carl just needs to follow the Haynes manual or FSM in regards to setting the float level. An incorrect float level can starve the carbs of fuel, or over-fuel them (the mechanical pump and/or electric pump will force fuel into the carb).

I speak from experience in regards to the float levels, I think you just measure them out and get them both the same.

The rest is done via the syncrometer tool.
The chokes are a different story - I've set mine up just to get the car started- but I always physically check their closed as I don't trust the lever / wire. Most owners don't even set up the chokes.

 

[Farmer42]

On round top SU carbs, you can measure the float height by removing the top of the float chamber, turning the lid upside down so the float sits on the valve needle and measure the gap between the top of the float and the lid to factory spec. You then bend the metal tang to the right gap if it isn't correct. A correct size drill bit is good for measuring. You then do the same for the other carb. There are videos on Youtube that will show you.

For the airflow, you need to disconnect the link between the 2 carbs to set them properly. Use an airflow meter and get them the same to factory spec which I found to be between 7 and 10 on the scale for Hitachi carbs if I recall. I have HS6 SUs which are slightly different specs.