How-To: FCR carburetor accelerator pump timing adjustment

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In this video, I show you how to adjust the accelerator pump timing on a FCR carburetor. The timing screw can advance and retard the pump shot. I adjust it until there is very little play in the system.

[heathgraham]

probably one of the most informative and easy to understand creators I have watched

[kemitchell]

This was very, very good. Taking the time to show over, under, and well adjusted, both from the mechanic's point of view and in action, is gold.

[jarrettdidawick]

You are literally the only person that makes sense on this topic, I have a crf150r and I had problems with bog and I tried everything. Just until I found this, I tried and it my bike runs 110% better. Thank you dude. Really thank you

[Espenrip]

You made my day awesome today. First YT video i opened. Answered my question instantly. THANK YOU SIR. Coz i just bought an old YZ250 ‘06. My very first dirtbike. My 11yo race on his 65cc ktm. 3 yrs now, I fast paced learn how to fix and maintain this lil ripper. I dont have a deep pocket, so we have to rely on diy.
Now i got me a dirtbike so i dont have to watch him ride anymore.
I tore down this yz already twice, to clean and learn the bike inside out. I noticed this o-ring wrap around that accl pump adjuster. And YOU sir just gave the answer. THANK YOU VERY MUCH FOR THE DETAILED EXPLANATIONS in regards to this part of the carb. Your lessons are priceless. Buying you a dozen of beerz still priceless. Have a great day.

[thatsnotatraxxas]

Bro I was fighting my 05 yfz for hours before watching this video. You are the man thank you so damn much.

[carlosbarragan]

You deserve an award for humanitarian aid. Thanks again

[popdizzleutah]

Thank you! I had the o-ring on but I jumped to a QuickShot, JD kit and different jets, trying to get the bog worked out. After watching your video, turns out that screw was so far out, I was only getting 1/2 a shot of fuel. I adjusted that and got immediate results. The QS, JD and jets did absolutely nothing when I adjusted them. I have a Rekluse auto-clutch and the bike is idling low. I turned up the idle and that contributed to it being much snappier as well. I believe a Rekluse can magnify the bog problem. Thanks for taking time to post this.

[pufifa]

Yes! I was about to ask, what happens if I set up the carb as shown in this video, but my idle is not setup.... I have carb off the bike atm...
This was super informative! Many thanks for sharing this!

[vformarallo]

Two years later and you are still helping motorcycles, my scooter now accelerates a bit better thanks to you haha cheers

[jessea]

Thanks Matt.
My 2004 wr250f has always had a terrible bog in the throttle. After watching your video and following your steps and adding the o-ring it has made a huge difference!!!!

[Thatcompact]

You are the man, between this video and the fuel screw video I was able to dial in both my 450r and my wife's 150r. THANK YOU!

[calebmacgray]

Thank you so much for this. AP pump timing has always been gypsy magic to me and I've been living with the Honda bog for ages. No one really has a good video of this until now so thank you lol

[MasonCleveland]

I was having crazy bad bogging issues on my 11 ktm 530. Managed to adjust the slop out of the ap using the adjustment screw. Had to look carefully at where the rod that presses the diaphragm sits in the black plastic arm. You can see the slop and find where it is no longer pressing the rod down at all. Absolutely rips now no bog from idle while riding. I am also using the thick o ring from the JD jet kit. Worked great for me without removing the carb from the bike. Only the seat and gas tank.

[j.d.]

Thanks man, I'm a novice to carburetors and that was well explained.

[eliwesson]

Just want to say thanks for these awesome instructional videos I appreciate your work 🙏

[benjaminengle]

My guy. You saved me and this headache. Thank you for the great video.

[neil]

This is a perfect instructional video for setting up the Keihin AP. Thank you!

[evanlebaron]

I subbed! Great video, I wish every video was as on point as this one

[JD-ptij]

Thanks man. I definitely learned a lot on these types of carburetors. Since i was used to bikes with no AP's Thumbs up man

[justinlandrey]

I did this with an 06 crf250r I bought for nothing, none one could get rid of the bog . worked 100percent . bog gone runs like a beauty, great video thanks .