Uni syn carb tool?

[Jlovvorn]

Anyone ever try one of these to balance a 305 or other vintage Honda?

Worth trying?

I have done the usual drill bit, thumbs, etc.

http://www.ebay.com/itm/Edelbrock-4025- ... 4d&vxp=mtr

[ahenthus]

I've used a uni-syn on my Austin Healeys with dual SU carbs. One thing I've used on motorcycles is my Colortune. It's for all multiple setups. It costs about the same as the uni-syn.

[bikedoctor99]

Tried it , but the frame makes it hard to position properly.
The technique that works the best for me is to pull the caps and set them loosely onto the plug ( for easy removal).

Run the motor at 2,000- 3,0000 rpms, remove a cap and compare the speed of each exhaust- kill the motor, adjust the appropriate carb's cable to synchronize. Do this carefully and the engine will be balanced!

[rrietman]

what device are you using to calculate the "speed of the exhaust"?
Thanks
Randy

[bikedoctor99]

This technique is the method that I use for synchronizing the carbs and should be the last step for a tune up. (valves and timing should be spot on and the mixture, idle and float heights set to spec)

Start the bike on the center stand, remove the spark caps and put them onto the plugs loosely so they can be removed easily.
Use the throttle cable adjuster nearest the twist grip to run the motor at 2,500- 3,000 rpm, this will keep the motor at a steady constant speed.

Remove a spark cap, the motor will run on 1 cylinder and make a mental note of the engine speed that you hear through the exhaust, now replace the cap.
Repeat this with the other plug cap and you will likely hear a difference of engine speed.
Kill the motor and adjust the appropriate carb cable adjuster that is on top of the carb.
Repeat this procedure until both cylinder speeds are the same.
When the carbs are balanced or sychronized your accelleration from standstill will be smoother and the bike will perform with less vibration at elevated throttle openings.

One important note, you may want to use a fan or two to cool the motor.

[malcolmgb]

Anyone ever try one of these to balance a 305 or other vintage Honda?

Worth trying?

I have done the usual drill bit, thumbs, etc.

http://www.ebay.com/itm/Edelbrock-4025- ... 4d&vxp=mtr

We used a similar tool back in the 60's to set up twin carbs on SU carbs at a BMC dealership (MG, Rover etc) very easy and accurate to use but as someone has already said the frame would probably get in the way, the older mechanics would show us how to use a piece of hose (approx 1/2" bore) and listen to the air intake noise from the running engine, adjust the carbs until the 'hiss' from both carbs is the same.