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Old 11-22-2008, 04:24 PM   #1
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I just finished cleaning all 3 carbs and am wondering how you sync them anyone know?
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Old 11-26-2008, 07:22 PM   #2
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no?
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Old 11-26-2008, 08:33 PM   #3
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From a service manual. Hope it helps.



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Old 11-26-2008, 09:24 PM   #4
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Heres how I do them. First lay out all the carbs on the motor and install the needles(bell housings). Then I unscrew the idle screw(its on the side of the carb with a spring on it) so that the bells bottom out when you give it throttle and let off. Next adjust the cables so that all carbs move at the same time. This is done by loosening the nut on top of the bell housing on each carb. Not all may need adjusting, or none at all. Once done turn all the idle screws in 1.5 turns and re-install the carbs. Once the carbs are in and ready to go blow into the tank(or vent line or pull it over 50times) to fill up the lines and carb bowls. Once done you can pull it over and start it, at first it may not idle so keep turning up the idle screws until the sled idles where you want it to.
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Old 11-26-2008, 09:25 PM   #5
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make sure you cleaned the pilot jet, it often gets overlooked.
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Old 11-26-2008, 09:45 PM   #6
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You can adjust the idle with the carbs prior to installing them, but you must adjust the slides in place. Moving the cable will change the slide position. I use a 1/16" drill bit to adjust the idle screw on all three carbs. That will get you close, next install the carbs. Use a tie wrap or a hose clamp and pin the throttle wide open. Adjust the cables until the bottom of the slide is even with the top of the carb. Take off the clamp and give the throttle a couple of good squeezes. Take your fingers and place in two carbs against the slides. Squeese the throtttle the slides should move at the same time, do the same between the last two carbs. Another way is to follow the above procedure but then take a 3/8" drill bit and slide it into one carb, open the throttle until the drill bit barely slides between the carb and the bottom of the slide. lock your throttle in that position and check the other two carbs. Adjust accordingly. The drill bit method gets them really really spot on for me. Also take note that unless you have a throttle rail, turning the steering will change your syncronization. There is nothing you can really do about that. When jacket of the throttle cable moves or changes positon it can take up slack on the cable inside. Just make sure your bars are straight prior to adjusting. I used to drag race my sled and I discovered this one day. Good luck
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Old 11-26-2008, 10:06 PM   #7
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I've done it a few ways.

Goal, sync cylinders, then cables - check idle again and off idle flow.

Syncing the carbs is setting each cylinders idle air flow to be the same. Syncing the cables does not sync the cylinders, only insures maximum slide opening.

1) Cheap and Cheery
I used to use a long section of hose about 6 ft or so ran to a board 18" long and around the lid from a baby food bottle. The hose went from the bottom side by side straight up to the lid and around forming a loop. Both ends must be the exact same length. I marked the board at 1/16 intervals then filled the hose with green antifreeze - enough to go around the cap and into the hoses just past the first mark.

I use a long section of hose so the motor does not ingest the antifreeze used as an indicator before you can get the cylinders synchronized. If they are way off the antifreeze will flow towards the highest vacuum and if not corrected will be ingested.

To use hook one side to a vent/primer barb on one carb and the other to another carb. Start the engine and the vacuum will draw the antifreeze one way or the other. Adjust the carbs till they are the same idle and set cables so they are adjusted so the slides open fully. Make sure you allow for the safety switch to function properly. To do a triple do the center and pto then center and mag using center as reference. I bring the motor off idle and recheck. Cables should be set so they start to move at precisely the same moment from the base line set by the flow meter at idle.

I now have a Edlebrock airflow meter that goes over the carb inlet and measures the flow with a ball in a tube set up. Adjust so that all carbs have the same air flow measurement and sync cables.

Do not adjust cables so there is no play at idle. Set to sleds spec.

Always check that slides return to idle position when setting cables as sled could take off when started if idle is forced high by open slides.
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Old 11-26-2008, 11:16 PM   #8
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one of the best carb tools i ever used was from rpc performance, it was yellow and had a glass tube bent like a u on the plastic board, it had 2 hoses on the ends filled with glycole, the you buy a carb adaptor to fit on the side of the carbs, hook up the unit to the carbs and start it watch the tool and adjust .
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Old 01-16-2009, 10:38 AM   #9
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where on the carb you attach the rubber hose to check the vacuum. Also which screw you adjust to sync the carbs.
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Old 01-16-2009, 06:42 PM   #10
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<div class='quotetop'>QUOTE (zomowiec @ Jan 16 2009, 12:38 PM) <{POST_SNAPBACK}></div>
 Quote:
where on the carb you attach the rubber hose to check the vacuum. Also which screw you adjust to sync the carbs.[/b]
I have a piece of mirror I use, just watch and see if all the carb's valves are dropping at the same time and in the same spot in the throat of the carb.I have been doing this for year's,learned it from a polaris mechanic,good luck.
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