how do I sync my carbs? - HCS Snowmobile Forums

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Old 11-09-2006, 12:55 AM   #1 (permalink)
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How do I syinc the carbs on my 98 xcr 700?
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Old 11-09-2006, 07:52 AM   #2 (permalink)
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98 has round slide carbs..

loosen up cable to the carbs so the slides bottom out

then set each slide height to .98 using a drill bit "in next to the nozzle under the slide" with the idle screws "if slides don't bottom out on .98 then cable is still too tight"

after each carb is set to .98

tighten up the calbes start with the center til you can feel slight movement.
then repeat on remaining carbs.

play with the throttle a bit holding 2 slides at at a time you should feel the differences..

now the trick is to get them to move the same if ctr carb moves first loosen the ctr carb a touch til it matches the pto side.. make sure the carb cables are relatively close to begin with then check the mag side..

you have to repeast as needed til yuo get the feel.. for the adjustments

but you also have to make sure there is enough tension on the slides with the cables to close up the saftey switch in the throttle box.

hope it helps.. take you're time, be paitent. check recheck and check again..
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Old 11-09-2006, 08:15 AM   #3 (permalink)
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Roger

You have the right procedure but I think the measurment is .098" or 2.5mm.

Everything else looks good.
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Old 11-09-2006, 08:18 AM   #4 (permalink)
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you're right forgot the 0

.098 is the number
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Old 11-09-2006, 08:29 AM   #5 (permalink)
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I believe Roger means .098". But, because these aren't rack-mounted carbs like a 800 XCR, you will have a hard time setting to this spec unless you remove each carb and preset it from the OUTLET side before installation. And, the 700 may not end up at the same dimension as a 800.

On round slide carbs, I would recommend setting them while installed using a 7/32-1/4" drill bit from the INLET side under the cutaway of the slide. If the engine was idleing at the correct rpm before, just pick a drill bit that fits under the tightest one. This is to get them all equal at idle only. Mark each thumb screw adjuster with red dry marker so later you can raise/lower the slides equally to achieve desired idle rpm.

Make sure each idle air screw is set the same as specified on the underhood jetting label.

Then adjust each cable to achieve equal opening as throttle is moved. Pay attention to maintaining correct slack in throttle lever to make safety switch work correctly. You may have to readjust this after you set the slides to the desired idle rpm.

:div20:
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Old 11-09-2006, 09:25 AM   #6 (permalink)
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I do believe the clearance your looking for at the throttle is .010-.030 for proper operation.
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Old 11-09-2006, 11:21 AM   #7 (permalink)
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Thanks for all the replies.This was a big help. :beerchug:
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Old 11-09-2006, 04:08 PM   #8 (permalink)
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iron xl...

Who's the hottie in your avatar? How do I get a chance to check her carbs?

hehe
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Old 11-09-2006, 04:45 PM   #9 (permalink)
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Quote:
iron xl...

Who's the hottie in your avatar? How do I get a chance to check her carbs?

hehe[/b]

Hey Mike I think that version has a single inverted draft carb feedin those 2 big jugs!!! :smilielol:
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Old 11-09-2006, 05:31 PM   #10 (permalink)
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lol,Yeah she dose have a high performace set up.Realy brings out the grain of our table to.
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