I have a 89 CBR 600F hurricane and I need to sync the carbs but I dont know how and I wont have my manual for another week. Can anyone help me out with this?

 

You're going to need a mercury manometer to sync your carbs and I'm assuming that you don't have one. If you do...you'd know how to sync it already.

 

The manual will explain in detail about your particular model. Generally, carbs being out of sync will only affect idle and starting -- so if you can crank it you should be o.k. to ride til the manual gets there. And I don't really like the mercury deals anymore -- this one's kinda pricey but well worth the dough ....

 

Hi partner, I am a newbie to this site but I just did this over the weekend to a friends 87 CBR600F1. The tool in the above post is a Carbtune II and is available from www.carbtune.com and will cost less then 100 bucks shipped. When doing your bike you will likely find that the location where the carbtune hooks up will require removing some plugs that are just past the intake boots on the cylinder head itself. They have a phillips head and are set at about a 45 degree angle towards the outside of the bike. The carbtune will come with the adapters you need to put in these holes to hook up the hoses to. The bike I did this on was a California model and had 2 hoses and to plugs. I used the 2 hose fittings that were already there and 2 adapters from the kit. With the engine set to idle around 1500 I synched the #1 to the #2 then the #3 to #4 then 1/2 to 3/4. The screws to do this also have small phillips heads and are located between the carbs and are easily seen when looking between them. I used a clean wine bottle for gas and used a piece of hose to go to the fuel filter. I ended up placing the wind bottle between the frame and the rear hugger behind the battery box which worked well as the pump did not have enough suction to pull fuel from the ground level. I also placed the sidestand on a 2x4 making the bike almost level for the procedure. After each adjustment you will want to blip the throttle a few time to make sure everything stays where it is supposed to be. If its your first time it may take a little tinkering as just the weight of the screwdtriver can change the reading but with a little patience you should do just fine. Hope this helps, Ray...

 

well said socalray !

The only thing I would add is if you had removed the air box base plate (aluminum plate with 4 rubber velocity stacks) prior to the Carb Sync you will need to check the Sync after you reinstall the air box base plate.

When you reinstall the air box base plate to the carb set, the carbs get moved around and come out of sync.

So to save some time and not to make the mistake I made, sync the carbs with the air box base plate attached to the carb set.

 

This is completely correct. The aluminum plate mentioned does not need to be removed as it does stabilize the "rack" of carbs. Removing the plate could definitely have adverse effects.

 

i wonder if that is why my carbs are all screwed up, i have had that off a few times and they run like crap, not to mention the shop i took it to sucks ***!

 

More fun carburetor factoids !

Enjoy

Pilot mixture screw settings
(Haynes service and repair manual CBR600F1 87-96 book # 1730)

If the pilot mixture have been renewed or disturbed they must be adjusted as follows.

Pilot screw limiter cap is cemented in place and can be removed with pliers and cemented back in place after adjustments have been made.

Turn each pilot screw in counting the complete revolutions until it seats lightly.

Write down revolution counts for each carburetor.

This is the only an initial setting and the pilot screws must then be adjusted as described.

Pilot screw initial setting
California model 2-3/4 turns
US models 2 turns
UK models 2 turns

Start the engine warming it up to normal operating temp.

Then set the 600 to the specified idle speed by turning the throttle stop screw.
(1000 rpm’s)

Turn all pilot screws out 1/2 turn while noting the effect on idle speed.

If engine speed increases by 50 rpm’s or more, turn all screws out a further half turn.

Repeat this procedure until the engine speed fails to rise.

Then reset the engine idle to specified speed of 1000 RPM

Using the #2 carburetor on all 600’s, slowly turn the pilot screw in while noting the effect in idle speed.

Once the idle has dropped 50 rpm’s, stop and back off the screw one complete turn.

Repeat this procedure on all remaining carburetors.

Then refit limiter cap on to each idle speed screw to limit movement using Loctite 601 adhesive.

On the 600 ensure that the engine idles smoothly and does not falter and stop after the throttle has been opened and closed a few times, then check throttle and cables for proper movment and operation.

Then for ****s and grins, check your original pilot screw settings that you recorded earlier against the new pilot screw settings, just to see how far off or in tune they were and note changes for later carburetor cleanings and adjustments.

 

Where are the piolot screws located at? Are they hard to get to?

 

ignore the yellow arrows, and look at the red one. there is a pilot screw for each carb, they are on the side, i believe they are ALL on the right side of the carbs (from the view of the picture, left while on the bike.) althought the two on the left may be facing out, and the two on the right facing the other way.

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