I hate jetting carbs: halp plz.

I hate jetting carbs: halp plz.

Postby PFox » Mon Apr 10, 2017 3:11 pm

Ugh. I have a single carb 2002 VLX I bought cheap to flip. Won't idle properly.

Pull the bowl expecting to see junk, instead find the slow jet hanging on by maybe 1-2 threads. It's also scratched all to hell, like someone tried to ream it out with a welding nozzle cleaner.

What jet do I put in? Stock is #125 for the main, #45 for the slow jet, as per the service manual I have.

Only engine mod I know of on this particular bike is a K&N filter. Does that warrant bumping up a jet size, or should I just get the stock jets and call it done? For $15 I'll even get genuine jets!

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Re: I hate jetting carbs: halp plz.

Postby RobbieAG » Mon Apr 10, 2017 7:16 pm

I would go stock jets and OEM air filter. The main concern is to get it running right so you can flip it right?
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Re: I hate jetting carbs: halp plz.

Postby PFox » Mon Apr 10, 2017 9:31 pm

RobbieAG wrote:I would go stock jets and OEM air filter. The main concern is to get it running right so you can flip it right?


That's my main concern.

Stock jet or enlarged jet, same price. Stock air filter is another $30 even from online sources (it's weird shaped) AND I think I'd also need to source another OE filter cover. The K&N is already there and gets cool points, I guess?
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Re: I hate jetting carbs: halp plz.

Postby Drdubb » Tue Apr 11, 2017 6:34 am

Any change in air or exhaust flow call for jetting changes. See if you can find a forum for this bike. If not, go up a notch on the main. You might want to see if dyno jet has a kit. Note that dynojet numbers differently, so you can't compare easily. Have to buy their stuff.

Make sure that carb is super clean. If it has an enricher style choke, triple check that. DAMHIK
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Re: I hate jetting carbs: halp plz.

Postby PFox » Tue Apr 11, 2017 7:03 am

Drdubb wrote:Any change in air or exhaust flow call for jetting changes. See if you can find a forum for this bike. If not, go up a notch on the main. You might want to see if dyno jet has a kit. Note that dynojet numbers differently, so you can't compare easily. Have to buy their stuff.

Make sure that carb is super clean. If it has an enricher style choke, triple check that. DAMHIK


Thanks. I'm lurking on Shadowriders and vt600, but the advice is all over the place.

It's not a huge difference from what I can tell; I might do one up on the slow jet and shim the needle instead of buying a new main. Or I'll buy a new main too, it's only $8. That one looks clean enough, and not wire-reamed. I just barely need to have the enrichener open to make it start/idle.

Does anyone sell a selection kit of Keihin jets? The Nighthawk is probably up next.

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Re: I hate jetting carbs: halp plz.

Postby Drdubb » Tue Apr 11, 2017 7:57 am

Jets R us
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Re: I hate jetting carbs: halp plz.

Postby Laminar » Tue Apr 11, 2017 10:01 am

Drdubb wrote:Jets R us


Seconded on that one.

I'd try the stock pilot and maybe a size up on the main, check plugs, see how it looks.
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Re: I hate jetting carbs: halp plz.

Postby PFox » Tue Apr 11, 2017 11:15 am

So you don't think I need to bump the pilot jet at all? Seems odd to me, given it wouldn't start/idle without enrichment. I figured I was undersized on the pilot for air flow, thus the no start.

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Re: I hate jetting carbs: halp plz.

Postby RobbieAG » Tue Apr 11, 2017 9:15 pm

PFox wrote:Stock air filter is another $30 even from online sources


I've been using Emgo filters - high quality OEM style but a lot cheaper. OEM Honda for the ST1100 is like $60 and the Emgo is $20.
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Re: I hate jetting carbs: halp plz.

Postby PFox » Wed Apr 12, 2017 10:00 pm

RobbieAG wrote:
PFox wrote:Stock air filter is another $30 even from online sources


I've been using Emgo filters - high quality OEM style but a lot cheaper. OEM Honda for the ST1100 is like $60 and the Emgo is $20.

Hmmm... $30 for filter and new jets, or 20+ for current filter, new jets, and a headache...

THAT'S A TOUGH ONE.

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Re: I hate jetting carbs: halp plz.

Postby PFox » Sun May 07, 2017 8:31 am

So I sourced a Honda OEM filter for $32, Emgo was $27+ shipping so it would have come out a wash. The OEM was local, I took a bus to go get it.

Should be able to start putting these parts on and retuning... Please idle, please.
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