[250rnit]

I have a 07 crf250r that has about 10 hours on it. I have an MSR fuel adjustment screw on the carb and the dealer adjusted the accelerator pump.I live in nebraska so it has been cold lately. When it's around 40 to 50 degrees out it takes about 50 kicks to get it goin. when its warm out ( 70+ degrees) it only takes about 5. Is this normal?

[redrider911]

Common for thumpers to start hard in the cold. Try wacking the throttle 8 - 10 times then kick

[250rnit]

Thanks for the reply. Ill do that.

[Mikey350D]

Accelerator pump should not effect start circuit.
BTW; Did dealer change leak jet size??
My son's '07 is the same. Just seems to need several wacks of the throttle before it will start.
We practice starting bike at home at different temp ranges , so we know at 30 degrees, bike needs 4 shots of fuel etc.... Then when he goes to ride he knows how many shots of fuel bike needs per temperature.
At his last race (below freezing overnight, I threw a cargo blanket over bike and put a small heater under motor, Amazing how much difference 10-15 degrees makes. Bike started on 2nd kick.
Also drain float bowl, start with fresh fuel.

[250rnit]

I should have made it more clear. The accelerator pump was adjusted for the bog even though it idnt really do anything. Thats a good idea practicing starts at different temps. Thanks for the info.

[250rnit]

I cracked the throttle 6 times and it fired of first kick. Although it is warmer today. Thanks for the advice guys!!

[Tom#91_crf250]

another tip from starting is to do full stroke kicks, i've seen a lot of people only do short sharp kicks when kicking over and it takes them ages to start. i find the best way is one foot on the paddock stand and 3 quick whacks of throttle, choke, 1 maybe 2 kicks from top of the stroke.


Another thing i have noticed is that i now run NGK Iridium plugs is if i don't change them regularly the bike is hard to start.

oh another thing no one ask is are all your valves in check, as this can cause hard starting.


as for the bog. i noticed it if i really jam on the throttle, i tried a quick shot 1 i got given and it didn't work, went back to stock, tried fuel air mixtures seemed to help, maybe it needs re jetting (yet to do it - had it a year keep forgetting) but ive just adapted my riding style and just roll on and its fine.

[250rnit]

My bike only has about 10 hours (maybe) so i havent checked the valves. Should I?

I went riding this evening and it started great.It was in the 60 degree range. I thought about a quick shot also to help the bog, but the mechanic I talked to told me to have him adjust the accelerator pump. When he did that I didn't notice anything. Like you said I am just adjusting to it and rolling the throttle more than wacking it open.

Thanks for the help.

[Tom#91_crf250]

i don't think you can adjust the stock accelerator pump? what did he actually do to it?

[Mikey350D]

Ditto: I would find exactly what he's doing to accel pump??? On son's '07: 40 leak jet (I believe stock was 70) and TBT reducer ring. This seemed to solve bogging.
Above stuff is very easy to do.
And yes, I would check valves, get a baseline reading.

[250rnit]

The mechanic told me he was going to adjust the acc. pump. On the receipt it says just that. I am going to school to be an auto mechanic so I do most the work myself. This is my first 4 stroke so i had him work on it because I am not familier with the carbs. I think he was just robbing me for an hour of labor. I dont want to make a big deal about it though. I just wont give them my bussiness.I have a scramble tomorrow so we will see how it runs. Thanks for the reply.

[[email protected]]

What's being missed here is the guy reported no problems,bogging or otherwise, until the weather turned cold.
The 07FCR carbs on Hondas have an accelerator pump you shouldn't have to touch, that's a dialed in unit and the big risk you're taking is screwing it totally up.
Take it from another cold weather guy- 50 kicks ?
-The accelerator pump ain't it.
-The valves at ten hours are a non-issue.The bike will tell you all about it when the clearances are off enough to matter, nobody checking their valves at 10 hours has found anything off enough to matter unless they checked them wrong.
-The leak jet is a non-issue.
Open your fuel screw a quarter turn bud !
If that doesn't work, install the next size pilot jet,fuel screw back to original setting.
If none of these work (which I doubt ),you have crud partially blocking your pilot and the float bowl needs removed so everything can be totally cleaned.
If the temp is in the 40's though make sure you don't have a ruined plug from al the kicking, so starting with a good plug open the fuel screw a quarter turn from where it was and have at it.
Screwing around with the accelerator pump and leak jet when the bike ran fine in warmer temps will only have you chasing your tail. Doug

[250rnit]

As for the acc pump. I just had the mechanic to what he thought would be best for the bog. Like I said I think he was just robbing me becouse i didn't notice any difference.I raced a Hair scramble today and it was 36 degrees out. I cracked the throttle 6 times and it fired up just fine and ran the 2 hours just fine. Like I said I'm new to four strokes and my starting technique was just of I believe.

Thanks for the help.