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View Full Version : 2007 CRF50 Fuel/Air Mixture Screw

Wes
01-19-2008, 10:36 AM
On my son's 50 it appears that I would need some kind of key to adjust the mixture. I can see the screw but it has no indentions for a screw driver on the head. It appears to not be perfectly circular with a flat end at one side. Does any one have any ideas other than getting an '05 carb (what I found searching on the net).

Thanks
Wrong Way
01-19-2008, 12:31 PM
I have not seen the new carbs on the CRF, but years ago I had to drill out a cover that hid the fuel adjustment screw on the carb to my RZ350.

I got a small drill bit and barely drilled deep enough to make a small hole. I then inserted a small screw and yanked the cover off. Once it was off, the carb looked more like a carburetor and less like an invention from C.A.R.B.

Not sure, at all, if this is your problem but it is the first thing that popped into my mind when I read your post.
HareRacing
01-19-2008, 01:50 PM
On my son's 50 it appears that I would need some kind of key to adjust the mixture. I can see the screw but it has no indentions for a screw driver on the head. It appears to not be perfectly circular with a flat end at one side. Does any one have any ideas other than getting an '05 carb (what I found searching on the net).

Thanks


not sure what it is called, it is a special tool. D-type something or other. you can usually get one in a jet kit for a honda (all honda's have this adjuster for the mixture screw) call your local shop and see if they have one laying around.
Wes
01-19-2008, 03:31 PM
not sure what it is called, it is a special tool. D-type something or other. you can usually get one in a jet kit for a honda (all honda's have this adjuster for the mixture screw) call your local shop and see if they have one laying around.

:thumbup
thanks
Seesm
01-24-2008, 11:45 PM
The screw (internally is the same) but on the older to 2004 models there is a straight slot screw driver top.
You can grind with a thing cutting wheel a slot to make it adjustable...
The new carb also has another downer... Not only is the pilot not tunable either is the needle...

On my newer 50;s I cut the slot (after i work it out the first time) and I put the older needle, needle clip and seat so you have a little tunability...

Thanks california air resouce board.