Surging and stumbling - Chicagoland Sportbikes
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post #1 of 9 (permalink) Old 08-09-2011, 09:06 PM Thread Starter
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Surging and stumbling

My '05 Yamaha Warrior has developed a nasty surging while cruising. While accelerating, it's fine. Once cruising it stumbles really bad.

It has Vance & Hines pipes and a Vance & Hines Fuel Pack. Is it possible to load a new map?



Where would you guys start looking first?


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post #2 of 9 (permalink) Old 08-09-2011, 09:27 PM

 
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The people at V/H are very helpful I'd give them a call.

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post #3 of 9 (permalink) Old 08-09-2011, 09:28 PM

 
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My guess air flow or tps.

Gus
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post #4 of 9 (permalink) Old 08-09-2011, 10:55 PM
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I'd check for vacuum leaks first, does it surge at idle too?

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post #5 of 9 (permalink) Old 08-09-2011, 11:03 PM
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*disclaimer* I know very little about the subject, but I am familiar with the bike. It backfires like a muh fugger, so the tuning may be helping the problem. Did the surging all of the sudden become an issue, or a gradual build up?

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post #6 of 9 (permalink) Old 08-09-2011, 11:43 PM
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Also no clue on what's going on, but picking up a PC3/5 and having some professional dyno tuning done would probably fix it and add 5ish RWHP. Not sure if the V&H unit can do it too, but might be worth looking into.

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post #7 of 9 (permalink) Old 08-10-2011, 08:07 AM Thread Starter
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Pat, it surged a tiny bit before, basically a minor annoyance. Lately it's doing it more and more.

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post #8 of 9 (permalink) Old 08-10-2011, 12:20 PM

 
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Pinched fuel line or clogged breather hose?

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post #9 of 9 (permalink) Old 08-11-2011, 12:28 AM

 
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It sounds like a fueling problem, the first thing I would do it pull the fuel pack off and see if it still does it. When you have everything apart your you can also double check all your fuel/electrical connections. Nothing beats a custom map though. I have see this allot when people down load a map from online for there bike, its makes good peak power, but under normal street riding, it sucks. If you want give me a call and we can talk more in depth. 815-560-7399 Ion Stear
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