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General Category >> Rubber Side Down! >> Wont rev up after Raptor petcock change
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Message started by hairball on 03/23/15 at 11:22:40

Title: Wont rev up after Raptor petcock change
Post by hairball on 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.

Title: Re: Wont rev up after Raptor petcock change
Post by Dave on 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.

Title: Re: Wont rev up after Raptor petcock change
Post by hotprops on 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?

Title: Re: Wont rev up after Raptor petcock change
Post by justin_o_guy2 on 03/23/15 at 18:10:01

How much did you pay for the Raptor?

Title: Re: Wont rev up after Raptor petcock change
Post by T.Claiborne13 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?

Title: Re: Wont rev up after Raptor petcock change
Post by Serowbot on 03/27/15 at 18:07:04

726565494454471715260 wrote:

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... ;)...

Title: Re: Wont rev up after Raptor petcock change
Post by T.Claiborne13 on 03/27/15 at 18:43:47

ok I did the raptor switch and forgot about that until I saw this thread

Title: Re: Wont rev up after Raptor petcock change
Post by Serowbot on 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...

Title: Re: Wont rev up after Raptor petcock change
Post by farmerpete on 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.