jetting the 100 - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 26 (permalink) Old 08-16-2014, 02:26 PM Thread Starter
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jetting the 100

I need to rejet the carbs since the previews owner didnt...i want to buy the parts separately instead of buyin the kit...with the set up i have, what parts would I need? What size jets?.. any info is apreciated.

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post #2 of 26 (permalink) Old 08-16-2014, 07:14 PM
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I'm not 100% sure what you have, if it's just exhaust and a K&N filter I'd follow the jetting for a Hyper charger....basically 125 Mikuni mains and a shim on each needle. That'll get you close.....

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post #3 of 26 (permalink) Old 08-16-2014, 07:48 PM Thread Starter
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I'm not 100% sure what you have, if it's just exhaust and a K&N filter I'd follow the jetting for a Hyper charger....basically 125 Mikuni mains and a shim on each needle. That'll get you close.....

125 on both carbs.?...What about pilot jets?
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post #4 of 26 (permalink) Old 08-17-2014, 08:48 AM
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You can go 1 size smaller on the rear cylinder if you want.....but I really don't think it makes that much difference if you're not using the stock exhaust.

There should be no need to change the pilots.

What exactly do the instructions for the intake say? I'd use that info if it's available. I'm just giving you what other guys have used with what appears to be a similar intake. Like I said, I'm not 100% sure what it is that you have on there. I've seen dozens of those cone style set ups over the years from lots of different manufacturers and I have no idea if they are all the same. If it was mine, I'd guess a little to the rich side...which is what I did with the jet size I gave you.

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post #5 of 26 (permalink) Old 08-17-2014, 12:23 PM Thread Starter
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You can go 1 size smaller on the rear cylinder if you want.....but I really don't think it makes that much difference if you're not using the stock exhaust.

There should be no need to change the pilots.

What exactly do the instructions for the intake say? I'd use that info if it's available. I'm just giving you what other guys have used with what appears to be a similar intake. Like I said, I'm not 100% sure what it is that you have on there. I've seen dozens of those cone style set ups over the years from lots of different manufacturers and I have no idea if they are all the same. If it was mine, I'd guess a little to the rich side...which is what I did with the jet size I gave you.


Bad part is I cant seem to find any info on the type of air filter I have...seems like they dont sell or make cone filter set ups anymore....and its a K&N....the only ones I find are the pods....im just gonna pull the carbs and see what i have then probably run a 117.5 front and 115 rear
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post #6 of 26 (permalink) Old 08-17-2014, 09:20 PM
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You can try that, but I'd think you'll be at least a couple steps too small. Those would work great if you just added pipes to a stock intake. With that intake and air being forced through a far more open filter I think I'd opt to be a tad richer on the mains rather than too lean. But you can certainly give it a try.....

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post #7 of 26 (permalink) Old 08-17-2014, 09:54 PM Thread Starter
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[QUOTE=Sick Mick;485577]You can try that, but I'd think you'll be at least a couple steps too small. Those would work great if you just added pipes to a stock intake. With that intake and air being forced through a far more open filter I think I'd opt to be a tad richer on the mains rather than too lean. But you can certainly give it a try.....[/QUy


youre right , that cone filter does suck alot of air, ill try the 125's... today as I was riding down the canyons, as I was cruising down and barely opened the throttle , i felt a little surge.... which jets are in charge of that?.. if im not mistaken the pilot jets are in charge of 1/4 to 3/4 of throttle right?
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post #8 of 26 (permalink) Old 08-18-2014, 08:41 AM
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Pilots are mostly used up to about a little over 1/4 throttle. The needles take over then and up to about 3/4 throttle. You're probably a little too lean on the needles, which is why I suggested putting in 1 shim.

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post #9 of 26 (permalink) Old 08-18-2014, 06:53 PM Thread Starter
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Pilots are mostly used up to about a little over 1/4 throttle. The needles take over then and up to about 3/4 throttle. You're probably a little too lean on the needles, which is why I suggested putting in 1 shim.


Holy hell, i just pulled out the carbs, the last owner did a number on it.... a bunch of screws were stripped, i had to work miracles to get them off, now I gotta order new screws too... it was running on 112.5 jets... No wonder it was running shitty... time to get the big jets in this thing!!!
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post #10 of 26 (permalink) Old 08-18-2014, 07:48 PM
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You're better off replacing those stripped phillips head screws with allen head type screws. If you have a decent hardware store around, it shouldn't be hard to find replacements.

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