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Old 12-20-2012, 01:28 PM   #1 (permalink)
SJO
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Vmax jetting

I just bought a 95 vmax 600 at auction. It came from Colorado and was supposed to be rejetted for minnesota, however they could not guaranty it had been done. How do I go about verifying it is proper for Minnesota elevation.
Thanks
Scott
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Old 12-20-2012, 07:04 PM   #2 (permalink)
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you would have to pull the carbs and see exactly whats in there as far as main jets, pilot jets, and the needle setting.

guessing minnesota to be a low level altitude, this would be standard jetting as delivered from the factory for elevations of 300'-2000':
main jet:156.3
pilot jet: 52.5
jet needle clip: #3
air screw: 1 1/8 turns out.

compare and see what you have and where its at. you also need to consider clutching. typically the clutch will be loaded lighter for higher elevation along with different springs in the primary. secondary settings will be different as well.

worry first about the carbs. if you run elevation jetting at lower altitudes you are subjecting yourself to a lean condition.
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Old 12-20-2012, 10:02 PM   #3 (permalink)
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what pipes? The GYT pipes require substantially different jetting than stock.
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Old 12-21-2012, 08:28 AM   #4 (permalink)
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Originally Posted by smokingcrater View Post
what pipes? The GYT pipes require substantially different jetting than stock.
good point! if it does happen to have aftermarket exhaust, chances are i have that info as well.
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Old 12-21-2012, 05:16 PM   #5 (permalink)
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This has me worried... all of my 3 VMAX 600's were set at 2.25 turns out. We checked them, cleaned them out, and reset to 2.25 turns out.
We are ride 200-1000ft elevation...
The front air jets were clogged shut in these sleds... they are clean now, and idle much more evenly. But I did notice afterwards that instead if just revving a bit and idling down... it wanted to die when it idled down. A quick blip brought it back and evened the idle.

You are saying just over one turn out is factory?
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Old 12-21-2012, 05:47 PM   #6 (permalink)
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believe it is 1 1/2 turn out.

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Old 12-22-2012, 12:19 AM   #7 (permalink)
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Good luck on jetting..I hope you get better gas mileage than i did...great sleds but mileage sucked.
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Old 12-22-2012, 02:54 PM   #8 (permalink)
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Quote:
Originally Posted by yamadad4 View Post
you would have to pull the carbs and see exactly whats in there as far as main jets, pilot jets, and the needle setting.

guessing minnesota to be a low level altitude, this would be standard jetting as delivered from the factory for elevations of 300'-2000':
main jet:156.3
pilot jet: 52.5
jet needle clip: #3
air screw: 1 1/8 turns out.

compare and see what you have and where its at. you also need to consider clutching. typically the clutch will be loaded lighter for higher elevation along with different springs in the primary. secondary settings will be different as well.

worry first about the carbs. if you run elevation jetting at lower altitudes you are subjecting yourself to a lean condition.
\Thanks yamahadad4 for the specs.
I am hoping to pull the carbs this weekend to check. Do the jets have markings of any kind.to determine size? Is it possible to run as is for a few minutes and check plugs to determine if proper fuel? Another post made mention of the pipes, if they are stock should I be good?
Thanks
Scott
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Old 12-22-2012, 03:17 PM   #9 (permalink)
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I believe jets do have a number o then stating size. Stock exaust = stock jets and clutching. Aftermarket exaust = larger jet and clutch work.
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Old 12-22-2012, 05:48 PM   #10 (permalink)
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Just pulled the carb. The jets were not changed was supposed to be the case. The main jet is 145 the pilot was 55. I am not sure what or where the jet needle clip is that yamahadad referred to. Any ideas?
Thanks, Scott
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Old 12-23-2012, 07:57 PM   #11 (permalink)
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the needle is located in the slide itself. its the long tapered goldish colored needle that protrudes through the carb body.

there a clip securing it and some optional notches or slots to either raise the needle(lower the clip) or lower the needle(raise the clip).

you have to remove the top of the carb to access. pay attention to the little plastic white washers above or below the clip, or both.
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Old 12-24-2012, 09:54 AM   #12 (permalink)
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Quote:
Originally Posted by dpawl31 View Post
This has me worried... all of my 3 VMAX 600's were set at 2.25 turns out. We checked them, cleaned them out, and reset to 2.25 turns out.
We are ride 200-1000ft elevation...
The front air jets were clogged shut in these sleds... they are clean now, and idle much more evenly. But I did notice afterwards that instead if just revving a bit and idling down... it wanted to die when it idled down. A quick blip brought it back and evened the idle.

You are saying just over one turn out is factory?
fortunately those are easy to access for adjustment. you need to consider what they actually do. basically they are controlling the engine tuning from idle to about 1/8 throttle.

if your air screw is too far out, you will have a poor idle. too far in, it will idle high. yes, one full turn one way or the other makes alot of difference. in your case, someone probably compensated for the plugged air jets by turning the screws out. your borderline maxed out on those screws and possibly on the edge of having them vibrate out.

go back to the baseline of 1 1/8 turns out. set your idle, and turn these screws about 1/4 turn at a time in or out until you here the rpms increase. reset your idle speed and check your throttle response up to about 1/8 throttle.
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