Weird cover on the bottom of carb


13 replies to this topic
  • kid on a 426

Posted February 19, 2006 - 02:52 PM

#1

Me and my dad were out in the garage adjusting the pilot screw because it was way too lean so he's looking down there and there's a red cover on the very bottom of the carb and it's not a magnetic drain bolt its behind that if no one know's what it is i might be able to post some pics. I think the brand is factory r and d but its really hard to read and i cant find it on google

  • Yak

Posted February 19, 2006 - 02:57 PM

#2

Factory R&D P-38 Accelerator Pump cover.... :thumbsup:

  • kid on a 426

Posted February 19, 2006 - 02:59 PM

#3

wow thanks for the help so fast do you think that may have contributed to it running waaayyyy too lean even with a queit core in

  • Yak

Posted February 19, 2006 - 03:08 PM

#4

No probably not. what throttle position is it running lean at?

  • kid on a 426

Posted February 19, 2006 - 03:13 PM

#5

Well we fixed it pretty good now but before when u just give it a little gas above idle and let off it would make huge popping noises but we just backed out the fuel screw a bit and its almost completely gone. i didnt know that that little screw made such a big difference now im thinking of getting like a zipty easy adjust one

  • kizzle426

Posted February 19, 2006 - 04:02 PM

#6

Yeah, I just got my Zip-Ty not too long ago and I love it. Just be sure before you adjust it you let it warm up completely. A lot of times mine will pop when it first starts but it calms down after a couple of minutes.

  • donutman126

Posted February 19, 2006 - 10:04 PM

#7

does the pump cover do anything or is it just for lookks

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  • JSanfilippo

Posted February 19, 2006 - 10:40 PM

#8

Well we fixed it pretty good now but before when u just give it a little gas above idle and let off it would make huge popping noises but we just backed out the fuel screw a bit and its almost completely gone. i didnt know that that little screw made such a big difference now im thinking of getting like a zipty easy adjust one


How many turns did you turn the fuel screw out?? Sounds like you need to go up a couple sizes on the pilot jet

  • kizzle426

Posted February 19, 2006 - 10:45 PM

#9

does the pump cover do anything or is it just for lookks

It makes the fuel spray into the mix faster. Yes it makes a difference especially on 400/426's as well as the BK mod.

  • kid on a 426

Posted February 19, 2006 - 10:48 PM

#10

How many turns did you turn the fuel screw out?? Sounds like you need to go up a couple sizes on the pilot jet

Like 1 and a half i think my dad said

  • JSanfilippo

Posted February 19, 2006 - 11:33 PM

#11

Like 1 and a half i think my dad said


Maybe one size?? Then again I shouldn't talk outta my ass like this because I am familiar enough with the FCR carb to be giving jetting advice but from what you described in your original post it sounded like it was lean on the pilot jet :thumbsup:

  • kizzle426

Posted February 20, 2006 - 12:51 AM

#12

Like 1 and a half i think my dad said

If you have to go over 2 turns in either direction, you either need a size up or a size down. 1 and a half is about what I run.

  • kid on a 426

Posted February 20, 2006 - 05:46 PM

#13

ya it pops a tiny bit when im flying down a hil and using the compression braking but thats probably only because its cold out

  • kizzle426

Posted February 20, 2006 - 05:51 PM

#14

A little bit of popping is completely normal. That's just back pressure.





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