Carb tuning help before I start - Yamaha Raptor Forum
 
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post #1 of 8 (permalink) Old 09-05-2018, 09:00 PM Thread Starter
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Carb tuning help before I start

I have a 2005 660. It has a White Bros E Series slip on with the spark arrestor in, airbox lid off with uni filter. Has 25 pilots. I have an unopened stage 2 dynojet kit. I live in Wisconsin. Looking to see if anyone can tell me what mains I should run as well as needle and a/f screw positions. Thanks in advance
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post #2 of 8 (permalink) Old 09-05-2018, 09:27 PM
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144 main left carb, 146 main right carb
DJ needles center notch
Fuel screws around 2 1/4 turns out

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post #3 of 8 (permalink) Old 09-05-2018, 10:28 PM
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What t_w says ^^! (using Dyno Jets... would be 160, 165 Mikunis)

'01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, jetted, K&N
'01 Polaris Scrambler 400, K&N
'02 Honda 400ex, Big Gun pipe, jetted, K&N, Lonestar +2 A-arms, Lonestar anti-vibe
'04 Suzuki LTZ400
'16 RZR XP4 1000 Turbo
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post #4 of 8 (permalink) Old 09-06-2018, 04:17 AM Thread Starter
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144 main left carb, 146 main right carb
DJ needles center notch
Fuel screws around 2 1/4 turns out
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Originally Posted by QuadManiac View Post
What t_w says ^^! (using Dyno Jets... would be 160, 165 Mikunis)
Thanks a lot guys! Going to work on getting it tuned this weekend.
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post #5 of 8 (permalink) Old 09-09-2018, 02:22 PM Thread Starter
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144 main left carb, 146 main right carb
DJ needles center notch
Fuel screws around 2 1/4 turns out
So I have 146L and 148R with the fuel screws 2.5 turns out and the plug is still a little white? The wheeler pulls good and hard from idle all the way to redline through all the gears.
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post #6 of 8 (permalink) Old 09-09-2018, 05:39 PM
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So I have 146L and 148R with the fuel screws 2.5 turns out and the plug is still a little white? The wheeler pulls good and hard from idle all the way to redline through all the gears.
if it runs good then its probably good then.

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post #7 of 8 (permalink) Old 09-10-2018, 10:54 PM
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Are you starting then immediately pegging throttle under load, then killing engine with throttle still wide open (proper plug chop test)? Else, you can't tell which of the three throttle circuit is running a bit lean.

You can try one step richer, but I'd bet you'll be wasting your time... you're already one step richer than I would have tried.

'01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, jetted, K&N
'01 Polaris Scrambler 400, K&N
'02 Honda 400ex, Big Gun pipe, jetted, K&N, Lonestar +2 A-arms, Lonestar anti-vibe
'04 Suzuki LTZ400
'16 RZR XP4 1000 Turbo
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post #8 of 8 (permalink) Old 09-19-2018, 11:14 AM Thread Starter
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Are you starting then immediately pegging throttle under load, then killing engine with throttle still wide open (proper plug chop test)? Else, you can't tell which of the three throttle circuit is running a bit lean.

You can try one step richer, but I'd bet you'll be wasting your time... you're already one step richer than I would have tried.
You right. Thinking I'll go back down to 144/146.
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