Running air filter or pipe with no jetting - Yamaha Raptor Forum

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Old 12-06-2011, 02:26 PM   #1 (permalink)
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Default Running air filter or pipe with no jetting

How much of a power loss do you get when you use an aftermarket pipe or filter with no jetting? Does it run noticeably worse? I wanna throw an air filter in and possibly a pipe. How necessary is jetting the carb after these?
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Old 12-06-2011, 02:50 PM   #2 (permalink)
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You'll notice a slight power difference, but worse you'll decrease the engine life.

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Old 12-06-2011, 02:58 PM   #3 (permalink)
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Youll be decreasing the engine life significantly. You'll be burning out your valves very quickly
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Old 12-06-2011, 03:33 PM   #4 (permalink)
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With a normal aftermarket high flow filter, what jets would be recommended?
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Old 12-06-2011, 04:58 PM   #5 (permalink)
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Essentially what you're doing is running the engine lean. NOT good for it at all. A simple filter swap isn't as bad as a whole new high-flow intake, but it's still not ideal if it really is a big upgrade in air intake. As far as running stock jetting w/ an aftermarket pipe/filter... don't do it, you're cheating yourself out of performance and hurting your bike. If you're gonna spend $300-750 on that setup, do yourself (and your bike) a favor and spend $30-75 and jet your bike properly. Otherwise, you're just wasting your money. Don't neglect your carbs.

No clue on 350 jetting numbers though, sorry.
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Old 12-06-2011, 05:04 PM   #6 (permalink)
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Quote:
Originally Posted by SegKast View Post
Essentially what you're doing is running the engine lean. NOT good for it at all. A simple filter swap isn't as bad as a whole new high-flow intake, but it's still not ideal if it really is a big upgrade in air intake. As far as running stock jetting w/ an aftermarket pipe/filter... don't do it, you're cheating yourself out of performance and hurting your bike. If you're gonna spend $300-750 on that setup, do yourself (and your bike) a favor and spend $30-75 and jet your bike properly. Otherwise, you're just wasting your money. Don't neglect your carbs.

No clue on 350 jetting numbers though, sorry.
Thanks, I just was't sure if jetting was needed for a new intake. I hear people running main jets from 150+ but thats with exhaust and intake. I dont know if that would be necessary if I was just swapping the intake system...
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Old 12-06-2011, 07:11 PM   #7 (permalink)
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I rode my bike right after I installed my full exhaust. It ran worse than it did when it had the stock pipe. Then I installed a pro flow intake. Still ran like crap. Then I jetted the carb, and then I saw a huge increase in power. But this is a 660 not a 350...

On your jetting question. Have you removed the air box lid? If so then yes you will have to rejet. Not sure on the numbers tho since I dont have a 350. Do note that there are two different numbering systems. Dynojet numbers are not equivalent to other manufactures jets.
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Old 12-06-2011, 09:23 PM   #8 (permalink)
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I haven't bought any aftermarket system yet, so my lid is still on. If I bought a system and still had the lid on would I still have to rejet?
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-ITP Holeshots on ITP SS112 Black Wheels
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Old 12-06-2011, 09:36 PM   #9 (permalink)
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Not with the lid on... I wouldn't.
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Old 12-06-2011, 09:39 PM   #10 (permalink)
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I'm not even sure if there's any aftermarket systems that I could still run the lid with Looks like i'll be either rejetting or leaving it stock...
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-HMF Competition Exhaust
-Pro Design Pro-Flow Uni Intake (No Lid)
-ITP Holeshots on ITP SS112 Black Wheels
-12/38 Sprocket set-up
-RuKind Reaper Eyes
-LEDs Everywhere
-EMGO Direct Shifter
-Pro Taper Seven-Eights Bars
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