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k&b carb question

Old 03-03-2006, 07:39 PM
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fishy2k8
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Default k&b carb question

i have a k&b .40 engine i bought a few years ago for a project. i have yet to finish that project because of putting it away for some time.... i had the engine out looking at it because in the past few months ive learned a lot more about nitro from this site. i bought a nitro car and have tuned it and such so im learning. i was looking at the k&b engine (its marine) and i was wandering which adjustment were which on this carb. i added some pictures.. i am wondering if the high rpm needle is the one on the end. i know the low end needle in the one with the throttle adjustment lever. and i believe the idle in the one on top.. am i right? sry about the pictures.. i took them from my phone
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Old 03-03-2006, 08:37 PM
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Default RE: k&b carb question

Yes, the low speed needle is the one on the throttle arm side. The high speed needle goes on the other side, where the lock nut is. The one on the top is the low speed end point adjustment and removing it allows you to remove the throttle barrel.
Old 03-03-2006, 08:47 PM
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Ron Olson
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Default RE: k&b carb question

The high-speed needle appears to be missing in the shots. The nut keeps the needle from moving or "self-adjusting" from vibration.
Old 03-03-2006, 08:51 PM
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fishy2k8
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Default RE: k&b carb question

is there a better carb that i could get that would fit this engine?
Old 03-03-2006, 08:54 PM
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Default RE: k&b carb question

so does this carb not have a high speed needle or something?
Old 03-03-2006, 09:17 PM
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Default RE: k&b carb question

That's what I'm guessing as I don't see one sticking out.
If you want a better/newer carb, I'd suggest the K&B Red carb as it's made for .45's yet should be no problem for your .40 . The newer .45 carbs I don't like as they have a tiny screw that holds the low-speed disc in place and falls out easily. Yes, it has a disc instead of the normal low-speed screw.
Old 03-03-2006, 10:17 PM
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Default RE: k&b carb question

so i would tune it by....?
Old 03-03-2006, 10:22 PM
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Default RE: k&b carb question

so what is this for?
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Old 03-03-2006, 10:59 PM
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Default RE: k&b carb question

ORIGINAL: fishy2k8

so what is this for?
It's a lock nut for the high speed needle. What's the history of this engine? Did you buy it new or second hand? It should have come with a needle. If you got it second hand, it's possible the prior owner forgot to send you the needle, or maybe he was using a remote needle. See if the hole on the high speed side is plugged. This might be a sign of using a remote needle valve.
Old 03-03-2006, 11:06 PM
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Default RE: k&b carb question

my dad got it off ebay a few years ago.. came with engine, muffler, and bolts for muffler
Old 03-03-2006, 11:16 PM
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Default RE: k&b carb question

Check the Mecoa site, they may have a needle it. Here's a link to the K&B parts page: http://www.mecoa.com/kb/parts.htm
Old 03-03-2006, 11:20 PM
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Default RE: k&b carb question

this looks like my carb http://www.mecoa.com/kb/carbs/carb4061.pdf
Old 03-03-2006, 11:58 PM
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Default RE: k&b carb question

Great, now you can tell exactly what parts are supposed to be there. Remove the needle lock nut, slip a piece of fuel tubing over the needle collet and try blowing through it. If it's open, the person forgot to send the needle. If it's plugged than he was probably using a remote needle.
Old 03-04-2006, 06:11 AM
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Default RE: k&b carb question

i will try that! thanks
Old 03-12-2006, 01:34 AM
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Default RE: k&b carb question

well i have solved my problems.. the engine box has foam in it and under the foam i knew there was a small bag with the bolts for the exhaust.. and there was another thing with it, at the time i thought was a hex wrench.. well now that i know something about nitro engines.. i was looking through there today and saw that and was like duh.. thats the needle.. the guy had to take it out to put it in the box! thanks for your guy's help.

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