how do I sync my carbs?

iron_xl · 11-09-2006, 12:55 AM

How do I syinc the carbs on my 98 xcr 700?

RogerBzXCR · 11-09-2006, 07:52 AM

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..

akiqpilot · 11-09-2006, 08:15 AM

Roger

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

Everything else looks good.

RogerBzXCR · 11-09-2006, 08:18 AM

you're right forgot the 0

.098 is the number

patrioticinnovations · 11-09-2006, 08:29 AM

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:

jaydog · 11-09-2006, 09:25 AM

I do believe the clearance your looking for at the throttle is .010-.030 for proper operation.

iron_xl · 11-09-2006, 11:21 AM

Thanks for all the replies.This was a big help. :beerchug:

Fire Chicken · 11-09-2006, 04:08 PM

iron xl...

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

hehe

RogerBzXCR · 11-09-2006, 04:45 PM

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:

iron_xl · 11-09-2006, 05:31 PM

lol,Yeah she dose have a high performace set up.Realy brings out the grain of our table to.

11-09-2006, 07:52 AM	#2 (permalink)
RogerBzXCR Super Advanced Member Join Date: Nov 2003 Posts: 5,632 Current Sled(s): 02 EXCR 00 and 02 XCR 800's Previous Sled(s): Indy 600, JDX8, Rupp Nitro Location: Tewksbury Ma Age: 50 Riding Since: 1970	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.. __________________ Roger's Web Page 2000 XCR 800 - 02 Edge-XCR - Brandon on the EDGE-XCR Rate Charts for VES / Primary / 2ndary Springs Gear~Speed~Chain Pitch Calc - Gearing Chart for Polaris PC must have Microsoft Excel and You need to Use Internet Explorer for the Calc's to work

11-09-2006, 08:15 AM	#3 (permalink)
akiqpilot Super Advanced Member Join Date: Dec 2005 Posts: 5,243 Location: South Central Alaska	Roger You have the right procedure but I think the measurment is .098" or 2.5mm. Everything else looks good. __________________ "Never argue with an idiot; they'll drag you down to their level and beat you with experience." ~ anonymous

11-09-2006, 08:18 AM	#4 (permalink)
RogerBzXCR Super Advanced Member Join Date: Nov 2003 Posts: 5,632 Current Sled(s): 02 EXCR 00 and 02 XCR 800's Previous Sled(s): Indy 600, JDX8, Rupp Nitro Location: Tewksbury Ma Age: 50 Riding Since: 1970	you're right forgot the 0 .098 is the number __________________ Roger's Web Page 2000 XCR 800 - 02 Edge-XCR - Brandon on the EDGE-XCR Rate Charts for VES / Primary / 2ndary Springs Gear~Speed~Chain Pitch Calc - Gearing Chart for Polaris PC must have Microsoft Excel and You need to Use Internet Explorer for the Calc's to work

11-09-2006, 04:08 PM	#8 (permalink)
Fire Chicken Super Advanced Member Join Date: Dec 2002 Posts: 1,032 Current Sled(s): IQR and Mach Z Location: MI Favorite Riding Area: Lower MI (West Side) Age: 39 Riding Since: 10	iron xl... Who's the hottie in your avatar? How do I get a chance to check her carbs? hehe __________________ Currently in Stable 2007 Polaris Dragon SP 2005 Mach 1000 SDI 2003 Polaris Classic 2002 XC500 SP 1979 Polaris TX440 1974 John Deer 400 1971 Polaris Charger 432 RIDE HARD RIDE FAST!!

11-09-2006, 12:55 AM	#1 (permalink)
iron_xl Member Join Date: Oct 2006 Posts: 18	How do I syinc the carbs on my 98 xcr 700?

11-09-2006, 08:29 AM	#5 (permalink)
patrioticinnovations Super Advanced Member Join Date: Sep 2005 Posts: 9,267 Current Sled(s): 2000 XCR 800 turbo Previous Sled(s): 2003 XCR 1100, 98 XCR racer, 07 Attak Location: SE Lower Michigan Favorite Riding Area: Cadillac, Gaylord Riding Since: 1982	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:

11-09-2006, 09:25 AM	#6 (permalink)
jaydog Member Join Date: Feb 2006 Posts: 25	I do believe the clearance your looking for at the throttle is .010-.030 for proper operation.

11-09-2006, 11:21 AM	#7 (permalink)
iron_xl Member Join Date: Oct 2006 Posts: 18	Thanks for all the replies.This was a big help. :beerchug:

11-09-2006, 05:31 PM	#10 (permalink)
iron_xl Member Join Date: Oct 2006 Posts: 18	lol,Yeah she dose have a high performace set up.Realy brings out the grain of our table to.

Remove Advertisements Sponsored Links
Hardcore Sledder Snowmobile Forums Advertisement