[brownedoff]

Been threw my bike its great but when idleing if u twist the throttle straight back it will bog and sometimes die 💀 then after restarting went up a hill low revs and ig bogged out and couldn't get I started again till cold then runs fine again as normal but I don't like the bog bog I've already cleaned the carb out real nice 5 hours ago bit the bike had always had the idle bog when revs up its fine just don't like the bog out the corner in high gears ..... Will the accelerator pump mod redbeard says work on my 250 r as on the post it says 450 r don't want to do it on mine and mess it up on something I read it says work on 250 07 .... Just want it running sweet 🍬 anyone who experienced this plz help cheerrzzz

[hall_philip]

I don't think the bog always comes from the AP pump. I have a 09' 250X with R head, cam, KW valves, vertex piston. when I first did the motor over I was having problems, my valve lash had moved on me and I was getting a bog of idle. move your needle around. change some mains out, make sure you got the right size pilot. I have a QS3 adj. leakjet and fully believe that you need to get your main circuits working properly first, the AP pump is just to aid the system. good luck in tuning my friend, if you want any further info hit me up and ill help you with any details I can.

[brownedoff]

What do you mean change some mains out and move your needle about plz help I really bogging out now thanks

[hall_philip]

ok to start with, check your valve lash. adjust them if necessary or have a shop adjust them if you don't have the book. see if that helps. If that didn't take care of it or they were within spec than I would think the carb was suspect. first make sure its clean, do not spray carb cleaner in there without removing the slide or it will damage it. the float must be set at 8mm, this is critical of the FCR carbs. next make sure the AP pump diaphragm is in good condition or replace it. record the size of the leak jet in the carb float bowl.
record the size of the main jet, record the size of the pilot jet, also record the number of turns in on the fuel screw before you remove it. put the carb back together and try it out. if your not comfortable with this type of work let your shop handle it. I hear good things about the JD jet kits. I am stubborn and do it the hard way.

[rachachad]

I put a 06 carb on my 07. Ran way better and it's easier to tune also. I had the same issue. I read that the 07 carb was bigger 38mm I think. So I made the switch to the 06 carb 36mm. It shoots less fuel out of the Accelerator Pump so it bogs the bike less. So I've read on forums. Or u can mess with the Jets suggested by hall_phillip

[mossman77]

It shoots less fuel out of the Accelerator Pump so it bogs the bike less. So I've read on forums.

The sole purpose of the accelerator pump is to prevent bogging. You can have a lean bog or a rich bog if the AP circuit isn't tuned properly, but to say less fuel out of the AP bogs the bike less is a misinformed statement. Buy the upgraded AP kit from this website for $30 and fix the issue for good.

[brownedoff]

the carbs ok ive cleand it out all good valves are sound im looking towards electrical i am thinking its maybe an staor pick up issue i have a wireing diagram but does anyone know how to test ? as it just pops and pops when doing anything with the throttle

[JimDirt]

Follow this and it should tell you if its in the ignition system

[brownedoff]

Hi I know it the carb now after changing fuel cleaning tank air filter new sparkk plug fully cleaning carb cleaner and air line and assembled was running fine untill a few hard twists of throttle then bog and backfire anything above idle .... Let bike coold down still same starts up fine but bogs anything above idle I have checked timing checked velves all excellent just bogs and bikefires anything higher than idle at least I know its carb but what its fully clean and Same as before as I cleaned the carb a year ago and was fine after aaagggghhh please help