686 jetting recommendation? - Yamaha Raptor Forum
 
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post #1 of 6 (permalink) Old 10-24-2008, 07:16 AM Thread Starter
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686 jetting recommendation?

I'm having a 686 kit installed, 11:1, stg. 2 cam, CT pipe, pro designs foam filter, open airbox. Was thinking of going with either a Dynojet or Vito's jet kit, what would you recommend and what jetting should I start at? I am at about 500-800' above sea level. Thanks.

2004 719
11:1 CP piston
WK ported head
CT Pipe/jets
Stg 2 Hotcam
Proflow foam filter and Outerwear
12/39 sidewinder titanium sprockets and smart chain
Barnett clutch, hinson basket
+4 axle, +2 LSR arms,
Jogaca Custom YFZ450 front shocks
Adjustable rear link
Renthal bars
Big F'in TEETH!

55hp, 44lb/ft
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post #2 of 6 (permalink) Old 10-24-2008, 05:26 PM
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I like the taper of the gyt-r needles, you can purchase that jet kit from your local dealership, it comes with 25 pilot jets (which you will need), the needles and an assortment of main jets.

for your setup I'd start with 25 pilots 2.5 turns out on the fuel screws, gyt-r needles on 4th clip, 165/170 main jets. That should be real close.
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post #3 of 6 (permalink) Old 10-25-2008, 08:36 AM Thread Starter
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I have noticed that some jet kits come with springs too, is that something I need to get, or is not really that essential? Does the GYTR kit come with springs?

2004 719
11:1 CP piston
WK ported head
CT Pipe/jets
Stg 2 Hotcam
Proflow foam filter and Outerwear
12/39 sidewinder titanium sprockets and smart chain
Barnett clutch, hinson basket
+4 axle, +2 LSR arms,
Jogaca Custom YFZ450 front shocks
Adjustable rear link
Renthal bars
Big F'in TEETH!

55hp, 44lb/ft
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post #4 of 6 (permalink) Old 11-06-2008, 02:58 PM
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the gyt-r does not come with springs. I know the DJ does but I have never found them necessary to get proper jetting. The springs are supposed to help keep the slides from bouncing in rough terrain.
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post #5 of 6 (permalink) Old 11-10-2008, 02:59 PM
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Quote:
Originally Posted by CoalShedRacing View Post
The springs are supposed to help keep the slides from bouncing in rough terrain.
They are lighter tension springs to allow the slides to opean up faster.
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post #6 of 6 (permalink) Old 11-10-2008, 10:32 PM Thread Starter
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UPDATE: I ended up going with the CT jet kit and the bike runs awesome. I believe the shop installed the 165/170 combo. Although CT said to start with the 175/180... I'll have to double check, I may be mistaken on where the shop has it now.

Problem: I was hoping that by buying the EHS outerwears kit for the airbox that it would flow close to enough that I could put the lid back on for riding trails and be ok... WRONG!!! lol Runs good in the low to mid RPMS, but then runs pretty rich on the top end. They are going to take it down a size on the mains i think to go with this airbox setup. I'll continue this in the jetting section so it doesn't eat up any more of your time.
Thanks for all your input though. I'll let you know how it turns out.

2004 719
11:1 CP piston
WK ported head
CT Pipe/jets
Stg 2 Hotcam
Proflow foam filter and Outerwear
12/39 sidewinder titanium sprockets and smart chain
Barnett clutch, hinson basket
+4 axle, +2 LSR arms,
Jogaca Custom YFZ450 front shocks
Adjustable rear link
Renthal bars
Big F'in TEETH!

55hp, 44lb/ft

Last edited by Spruce; 11-10-2008 at 10:52 PM.
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