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Wont rev up after Raptor petcock change (Read 148 times)
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Wont rev up after Raptor petcock change
03/23/15 at 11:22:40
 
 I need a bit of advice or help here, I changed out the old petcock for a raptor petcock and can start bike but choke has to be all the way out and it will just idle and that's all, when I rev up the engine it dies. any suggestions? its a boulevard s40 650 and its a 2006 but I have less than 3k miles on it.
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Re: Wont rev up after Raptor petcock change
Reply #1 - 03/23/15 at 11:28:47
 
Did you put a rubber cap over the vacuum nipple on the carb body.....or plug the vacuum hose?  If not....it is causing an air leak.
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Re: Wont rev up after Raptor petcock change
Reply #2 - 03/23/15 at 13:33:27
 
sounds like lack of fuel flow.Did you buy the real real Suzuki part or a knockoff? there was a thread that addressed this and went so far as to specify correct fuel flow in cups per minute . ma by someone can find it and provide linkage .
and yes you plugged the vacuum inlet on the carb right?
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Re: Wont rev up after Raptor petcock change
Reply #3 - 03/23/15 at 18:10:01
 
How much did you pay for the Raptor?
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Re: Wont rev up after Raptor petcock change
Reply #4 - 03/27/15 at 16:54:17
 
on a side note would the vacuum line being left open(not plugged) cause it not to start as well?
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Re: Wont rev up after Raptor petcock change
Reply #5 - 03/27/15 at 18:07:04
 
T.Claiborne13 wrote on 03/27/15 at 16:54:17:
on a side note would the vacuum line being left open(not plugged) cause it not to start as well?

It could... leaving the vacuum tap unblocked creates a giant vacuum leak...
With no vacuum the engine has a hard time drawing in fuel...
No fuel,.. no go... Wink...
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Re: Wont rev up after Raptor petcock change
Reply #6 - 03/27/15 at 18:43:47
 
ok I did the raptor switch and forgot about that until I saw this thread
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Re: Wont rev up after Raptor petcock change
Reply #7 - 03/27/15 at 22:38:52
 
It's very important to block that vac tap...
It's not a flaw in the Raptor conversion,... a leak is just as likely in the stock vacuum hose...

That tap being open, is like drilling a 1/4" hole in your intake manifold...
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Re: Wont rev up after Raptor petcock change
Reply #8 - 03/28/15 at 18:53:11
 
Just a side note.. I swapped my petcock for a Raptor recently, and now it runs well, and even "backfires" less than it did with the original petcock. I like the change.
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