[goodquest]

I just went from a stock air filter to a No Toil Dual stage filter and my bike runs, but
Seems to stall upon quick throttle blips and just does not runs as well. What adjustments
Do I need to do.

Other suggestions welcome.

Thanks

[JimDirt]

Start with Fuel Screw , turn it in till just seated and count the turns , you should be between 1 1/4 -2 3/4 turns out , if it wont run better within that range then you need to re-jet , larger main , maybe lower the clip on the needle to 4th position , that should get you started in the right direction

[MX_RACER1]

Jim is on the money.
Fuel screw should get you there.

[goodquest]

If I remember correctly I have a 168 main and a 48 pilot. I will adjust fuel screw and see what happends.

Thanks for you help.

[JimDirt]

What is your elevation (or the elevation you normally ride)

This is the guide for jetting

Jetting Guide for Main Jet:(pilot 45)CRF450R/X

Sea level...165
2000 ft.......162
4000 ft.......160
6000 ft.......158
8000 ft.......155


Temperature/Elevation:
One main jet size (up/down) for every 2,000 feet or 25 degrees in temp.

[goodquest]

What is your elevation (or the elevation you normally ride)

This is the guide for jetting

Jetting Guide for Main Jet:(pilot 45)CRF450R/X

Sea level...165
2000 ft.......162
4000 ft.......160
6000 ft.......158
8000 ft.......155


Temperature/Elevation:
One main jet size (up/down) for every 2,000 feet or 25 degrees in temp.

Thanks for the information. I'm in California
so the areas I ride in range from 30 Sacramento
to Forresthill 3225.

Once it cools down, I'm going to try the fuel screw adjustment.

Thanks again

[goodquest]

Ok, Where is the fuel screw? Anyone have a picture or location?

Thanks

[JimDirt]

Bottom of the carb at the front of the bowl

You need one of these , it will make life easier so you dont have to loosen the carb and twist it sideways to adjust the fuel mixture

http://www.crfsonly.com/catalog/product ... ts_id/2792

[goodquest]

Bottom of the carb at the front of the bowl

You need one of these , it will make life easier so you dont have to loosen the carb and twist it sideways to adjust the fuel mixture

http://www.crfsonly.com/catalog/product ... ts_id/2792

Thank you

[MX_RACER1]

External fuel screw adjuster is a must. If you have big hands make sure you get one that has a flex neck and can be mounted further to the outside of the carb like the link that Jim Dirt gave. There are others that are just a big finger screw. They work well too, just not as simple to get at.

[goodquest]

I purchase the oversized fuel screw and adjusted the fuel screw (Mr smiths directions) and still have everything from quick throttle flame outs, or bogs. It’s odd I can do 6 quick throttle twists and on the 7th it will flame out or die. It back fires sometimes and it just doesn’t run well. I went back to a stock air filter and still have the same problem. The Honda service Advisor told me to go to a 50 or 55 leak jet and go down in the pilot. I guess it’s just a coincidence that all this happened after changing the air filter, but It sure got me baffled.

[JimDirt]

I have a question , are you oiling the crap out of that No-Toil filter ?? , if you are your starving it for air and that would make it bog,pop,stall

With a #45 pilot and a main in the area of 160 - 165 and the fuel screw between 1 1/4 - 2 3/4 , the bike should run fine

Rule out that the squirt is not hitting the slide when blipping the throttle (engine off , airbox off/ subframe up) and look to see down the throat of the carb if it just barely misses the slide , if the stream hits you need to adjust the AP timing , also try taking a small O-Ring and putting it around the AP screw and the stop

I thought there was a post here , but this is the only one i could find that has pictures to show you what to do , but this might help stop the bog

Also , if your rev-ving it on the stand it will bog /pop/stall sometimes , so make sure it runs fine under load , on the stand means nothing (sorry Ken for the link to that "other" site)

http://www.thumpertalk.com/topic/539540 ... or-an-fcr/

[goodquest]

I have a question , are you oiling the crap out of that No-Toil filter ?? , if you are your starving it for air and that would make it bog,pop,stall

With a #45 pilot and a main in the area of 160 - 165 and the fuel screw between 1 1/4 - 2 3/4 , the bike should run fine

Rule out that the squirt is not hitting the slide when blipping the throttle (engine off , airbox off/ subframe up) and look to see down the throat of the carb if it just barely misses the slide , if the stream hits you need to adjust the AP timing , also try taking a small O-Ring and putting it around the AP screw and the stop

I thought there was a post here , but this is the only one i could find that has pictures to show you what to do , but this might help stop the bog

Also , if your rev-ving it on the stand it will bog /pop/stall sometimes , so make sure it runs fine under load , on the stand means nothing (sorry Ken for the link to that "other" site)

http://www.thumpertalk.com/topic/539540 ... or-an-fcr/

No I did not over oil the filter. I even went
back to a stock pre-oiled filter to make sure.

I tested the bike under load with same results.

I will have to look up ap timing.

Thanks for the suggestions.

[crazybrother]

What year is your 450? And what have you done as far as MOD's?
Your pilot is a little too large. Try a 45 or even a 42.
Adjust the fuel screw this way and the bike will tell you what it wants for a pilot,

Setting the fuel screw mixture-
Try adjusting with the motor fully hot, and turning the fuel screw inwards until the idle slows or runs rough, then turn outwards 1 1/4 turns from this position. For example, if the idle slows or runs rough at 1/2 turn, then set the fuel screw to 1 3/4 turns out (1/2 + 1 1/4 = 1 3/4).
See- http://www.pbase.com/jdjetting1/image/82894252 to understand how the fuel screw can affect the idle speed and air/fuel mixture at idle. The target range for the air/fuel mixture is near 12.5 to 13:1 at idle.

[MX_RACER1]

Everything I've read to this point I agree with. You mentioned one thing that raised my ears a little. You said that you can rev is 6 times without issue then the 7th it would flame out.
While you have the bowl open. Make sure that your floats are not stuck creating a false lean condition.