When syncing the carbs on a 1991 Honda CBR 600 F2 there are only three adjusting screws to adjust them but there are four carbs on the bike. So how am I to sync the carbs with only three screws?

Marvin

• 85242 Answers
• Posted on Aug 04, 2009

SOURCE: 1977 750gs carb sync

carb sync is done using only the carb hard stop adjustment u don't touch the air fuel mixture screw, had this exact same bike had the serive manual am dead sure on this

SOURCE: Cleaning Carb Jets

not to a trained ear also go by rpm and spark plug color

NOTE: use copper wire to clean jets, sync is just thottles are same position as all carb's just leave them adjustments alone will be fine if are out use a 1/8 drill an place in between piston/butterfly to carb bore to sync/calibrate

better use a manometer for adjusting screws

depends on condition of org parts

worn = richer running

new = lean an clean

also if changed the exhaust system need to
re-calibrate carbs for max performance

SOURCE: Honda cbr 600f2 throttle adjuster?

Sounds like you were adjusting the idle mix screw on the carburetor. I think www.bikebandit.com has OEM parts, with diagrams. Also, there are many forums for different motorcycles and their owners on the internet, I would try a Google search for the right forum for your bike. Good Luck!

SOURCE: Hi my honda cbr 600 fl 1991 the bike pulls great

im not sure if this model has a fuel pump but follow your fuel line and see if it does wen u find it remove black plastic cap and check the points contact breakers are in good conditon ie not worn uneven or worn out and that they open and close.check your air filter spark plugs and your carbs could have a blocked jet so get them cleaned and balanced.

Testimonial: " meny thanks will try the things you said once again thank you"

SOURCE: wheres the idle adjustment screw on my carb.. i

There is a small knurled knob to the rear base at centre of carbies, this turns a worm screw, actuating a bar for all 4 carbs. The site below provides an exploded view and name of carby parts.

Here's a tip...if the knurled knob (designed to turn by hand) is too hard to turn, a multi facet (not hexagon facet) socket or ring spanner is far easier than pliers or grippers.

Cheers.

http://www.cmsnl.com/yamaha-fz600s-19861987_model9219/partslist/B-04.html