660 carb - Yamaha Raptor Forum
 
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post #1 of 6 (permalink) Old 02-07-2019, 04:06 PM Thread Starter
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660 carb

I recently purchased a raptor 660 which sat outdoors for 3 yrs not running bottom end is great top another story aquire reman head at a deal and 686 bbk no other mods to bike it's stock front to back what jets do I need with the bbk?
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post #2 of 6 (permalink) Old 02-07-2019, 04:34 PM
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I'm having trouble reading without punctuation but if I understand correctly, all you need is stock getting except get #25 pilots. Now if you change the intake or exhaust you'll need different jets.

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post #3 of 6 (permalink) Old 02-08-2019, 09:33 AM
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On BB engines with carbs they do not require bigger jets. The larger displacement pulls more fuel. I would start with stock jets, you may need to go down on the main by 1-2 sizes at the most. This is if it was jetted good before the BB kit and no other mods were done.
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post #4 of 6 (permalink) Old 02-08-2019, 01:48 PM
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Welcome to the forum!

If your airbox is going to remain intact, complete and closed and your exhaust is stock then you only need stock jets, although 25 pilots are always recommended.

If, however, you plan on an aftermarket exhaust or modifying your airbox - remove snorkel, or modify or remove the cover - then you need to increase your jet size and switch to DJ needles...

With more info on your plans we can give you a suggestion on where to start.

'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

Last edited by QuadManiac; 02-08-2019 at 01:51 PM.
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post #5 of 6 (permalink) Old 07-21-2019, 07:09 PM
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Anybody have a single carb setup for sale or guidance on how to make one?
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post #6 of 6 (permalink) Old 08-04-2019, 08:21 PM
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Anybody selling a single carb set up or manifold for raptor 660?
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