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Old 05-11-2009, 03:52 PM   #11
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Originally Posted by wolfrages View Post
some added info.

i had found this earlyer today.
Hypercharger Install* - 650 CCND
and it says "The idle mixture screws should be turned in (clockwise) until they seat gently. Open each idle mixture screw 3 1/2 turns (counter clockwise)"

i did this and it felt like i was drowing it in fuel...sluggish and poping hollibly

that's why i was adjusting
Although every circuit overlaps the next on a carb, idle screws are just that - for idle, and off-idle running. More than that, and the slide-needle has been drawn out of the main jet enough to render the idle-circuit irrelevant. The screws are a "fine tuning" device to sorta take up the slack between idle-jet sizes. Do you remember what size the idle jet is in this thing? I bet they put a #45 or larger in it, "cuz bigger is better with the Hypercharger, Yo!" I've only ever heard of Race Bikes needing larger idle-jet sizes (or bikes that were horribly smogged-over in the late '80s) than what's supplied from the factory (and I'm just guessing here, but I bet a #42 was stock).

Look here for carb-tuning info, far-better than I could ever explain it:

CV Carb Tuning Procedures
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Old 05-11-2009, 05:53 PM   #12
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i don't know what size jet are in it, or how to tell
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Old 05-11-2009, 08:39 PM   #13
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i don't know what size jet are in it, or how to tell
There should be a number punched somewhere on each jet. Sometimes you have to remove the jet to see it.
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Old 05-11-2009, 09:30 PM   #14
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Here's another couple of pages explaining the why's and how's of carb jetting:

Jetting Help - ThumperTalk

Jetting 101- The Basics - ThumperTalk

The first one is a "general info" page, the second deals with a specific bike - Yamaha TTR 125 (but the theory remains the same). They do much better at explaining it in layman's terms than I can.
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Old 05-12-2009, 05:32 AM   #15
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this is great info thanks, but my one question remains unanswerd...

can my striped mixture screws be replaced or do i need a new carb?
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Old 05-12-2009, 05:36 AM   #16
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this is great info thanks, but my one question remains unanswerd...

can my striped mixture screws be replaced or do i need a new carb?
If it's the screws that are stripped, and not the carb body - it should be OK. Finding new screws won't be fun, but it will probably be possible. If it's the carb body.........

I'd start looking on ebay and craigslist. Might start looking anyway - could even be cheaper for a set of used carbs than for a set of mixture screws from a Dealer.
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Old 05-12-2009, 09:23 AM   #17
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well, i went down my my dealer ship and they wanted 63$ and some change for the 2 screws

so my dad and me are going to pull the carb out, take the screws out and try dremling them deeper, better then 63$ that i don't have...
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Old 05-12-2009, 09:42 AM   #18
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"well, i went down my my dealer ship and they wanted 63$ and some change for the 2 screws"

Sounds like you got 'screwed'. Welcome to the world of Japanese motorcycles where a bike worth 600 bucks can cost you 5 grand to fix. Check the boneyard for what you need.
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Old 05-12-2009, 12:41 PM   #19
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This may be your best way out:

YAMAHA V-STAR 650,XS650,XT550 REBUILT CARBS w/EXCHANGE!:eBay Motors (item 360147295904 end time May-15-09 00:35:57 PDT)
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Old 05-13-2009, 10:17 AM   #20
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ok, we got them out, ones in not bad shape, the other we will have to replace
Since it's made out of brass the easy out's we had to use worked on one, but the other got "drilled" cause that's all the easy out did, was drill it out...

so we have to replace the left one, but the right one we can salvage, lesson learned, brass screws SUCK, what guy down at Yamaha came out with the idea of using brass?
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