Carb sync

lowrider · Apr 28, 2006

Howdy,

I'm new to this forum but I do read it often and now I have a question. I did a carb sync on my 04 FJR recently which has a little over 20,000 miles on it and the problem I had was the #4 cyl. was low and when I tried to match the other 3 cyl. that were even and on the mark I ran out of adjustment. So what I did was lower the levels just a bit to keep the screw from being bottomed out. I do the adjusments listed here in the forums. Any thoughts or ideas?

radman · Apr 28, 2006

#3 is the base around which the others are adjusted. Seat all the adj screws lightly, turn out 1/2 turn, begin anew. May have to adjust idle speed several times before all is done.

GunMD · Apr 28, 2006

Someone installed carbs on your FJR??? ****...that's the problem. Take it back to the dealer and insist on fuel injection...then you can sync the throttle bodies.

Warchild · Apr 28, 2006

This is quie a common issue on the FJR.

You could do as Rad suggested, or... you can simply do the classic fix. Recall there is nothing special about cyl #3; it's just that you need to have a reference base to match the other throotle bodies against when doing a synch.

So, back off your bottomed out cyl #4 adjustment ~ 1/3 of a turn, and now it (cylinder #4) becomes your base reference cylinder, and synch the other three throttle bodies to it.

lowrider · Apr 28, 2006

Thanks Radman & Warchild,

I just finished re-tuning using your suggestions -

worked perfectly. Sorry for "carb sync" instead of "throttle body sync" but glad you guy's understood.