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Discussion Starter #1
trying to get the bog out of it when you stab the throttle from basically idle or 1/8 throttle on a yfz 450.

read you can replace the slow or whatever it is the feeds the acclerater pump.


any clues


running a 42 pilot ncvq needle 4th clip i think maybe 5th 175 mains i know it runs better now that i raised the needle just trying to work some bugs out.
 

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Wes inside the acclerator pump there is a jet just bump the size up, i am not 100% for sure what size is in there but go with a bigger jet.
I think you bump it up to a 50 or something.

Also why a 42 pilot jet?
 

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i run a yfz carb on my kfx400..same prob. i heard those fcr carbs just do that.....
 

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Discussion Starter #4
QUOTE (BBIII @ Jun 30 2008, 07:00 PM) index.php?act=findpost&pid=4182Wes inside the acclerator pump there is a jet just bump the size up, i am not 100% for sure what size is in there but go with a bigger jet.
I think you bump it up to a 50 or something.

Also why a 42 pilot jet?
bobby it came with a 48 pilot and it would get the pipe so glowing azz red at idle that i took it was so rich that it was burning fuel in the pipe. i had 45s in the banshee carbs i can put one in it now, but all i had was a 42.

what do you run or suggest.

i just need to get with you and have you put my ported head on and fix it up with a new fresh piston and oil mod and chech stuff out. but im on a budget and not looking to spend much money right now.
 

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The pipe usally gets red because it is lean on the pilot with any kind of aftermarket pipe.
Thats why i always use a 45 pilot with my 450 and the air screw @ 2 turns out.

Just let me know Wes if you get a piston get a CP piston they are about the best one out there for the yfz, oil mod is no problems just let me know.
 

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Discussion Starter #6
well i put lower pilot in and it doesnt glow red as much who knows seemed to run a bit crisper also but ill try a 45 later.

whats a piston kit and gasket kit cost roughly

brandon said i should get my carb bored out to a 41mm or buy one and it should really run. but i wonder about his ability lol j/k
 

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I would @least try a 45 but only change that then check it out, these carbs are a little finicky some times.

I get my gaskets from vitos but might see what RMATV charges for them.
Also pistons run about $200 for a cp shelf piston and get a comp. ratio of 12:5-1that way you can still run pump gas.

On the carbs it does make them run better and cost around $150 to get them bored to a 42mm and it will help it alot.
 
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