Red CNC Air Fuel Mixture Screw: Adjustable Carburetor FCR Air Screw for KEIHIN Carbs on 4-Stroke Motocross Motorcycles Review

Perfect for my 1994 Shadow VLX 600 carburetor! Would definitely recommend them to anyone who has carbs! Makes on-the-fly setup very easy

2006 yz250f. screws straight. It took me a while to figure out that the F in FCR stands for Flat. So if your carburetor says CR and the slide is flat, then it's an FCR carburetor.

Misleading, the picture shows the o-ring goes before spring but my carburetor diagram shows it's spring, washer and then o-ring what is very confusing if you are a beginner like me

Seemed a bit cheap at first I fitted it anyway, thought it would fall out, felt loose but after all day of rough riding it hasn't moved . happily easier to set up

Husband said it was just cat meows to make carburetor adjustment easier! If it was right for his Honda 450r. It was too long to go back when he bothered to try. So I think next time he will order parts himself. lol! PS Ladies, never ask her half asleep if this is the right thing to do!

Great price and does the job well. The only downside was that the edges of the part you are turning are very sharp. So be careful when hiring without gloves. I used my original nib as this nib seemed a bit long to me. So I would definitely order it again if needed for another bike. Happy with it.

I gave this product only one star. The reason is that this is the second air/fuel mixture screw I've bought from Revain and it doesn't fit the WR450F as stated in the description. The spring is too big and the bottom gasket doesn't fit into the carburetor, so the screw doesn't catch on the threads in the carburetor! I have started by returning the first screw sent to me and will not do it again for this purchase without wasting time and money again so I will consider it a loss and order from…

fits well but you literally can't screw it all the way down on the WR400F as the bolt head will collide with the float bowl drain plug as shown rendering it unusable without modification. I'll probably just grind down the screw head and make it smaller so it fits and I can still adjust it with my fingers on the fly. Also, the edges where you have to turn the screw are very sharp, so that's not ideal either. I was hoping for a quick and easy fix, but getting my bike set up correctly was another…

I didn't think the cut on the handle was too sharp as others have mentioned and it looks like a direct replacement for my factory bolt but the thread pitch on this bolt doesn't match that Thread on my carburetor. The thread on the screw is on the coarse side of the pitch, my factory screw has a fine thread, this screw would destroy my carburettor if I pushed it in there. I didn't see any mention of it in any of the other comments, but the prop I bought from Motion Pro worked great. If it…