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Spirit 1100 Hissing noise when choked

2473 Views 10 Replies 7 Participants Last post by  duncankane
Hello all - no pun intended with the title ;)

Anyway - had the carbs out tonight in order to rejet for my new baffles (more substantial than the lollipop baffle).

Anyway, with the normal amount of pain and suffering, I got everything back together. Decided to start it up to make sure I didn't royally screw it up and noticed a hissing noise when the choke is applied with the engine running.

As far as I can tell it goes away or is just less noticeable when the choke is closed (off). By opening and closing the choke I was able to trace it to somewhere above the front cylinder, up by the steering head.

As far as the noise itself, it's not a high pitched hiss, but more of a sound of air being sucked through an orifice (similar to the sound of blowing out of a straw). As far as I can tell, everything is connected...

Anyway, just curious if anyone knows if this is normal? It may be, and I just never noticed it before, but I figured I'd probe the knowledgeable minds on here.

I may try to check for any leaks in that area if I find some matches...

One other thing, does anyone have any tips for those dang choke plungers? Mine have a rubber "boot"/"sheath" around the cable and that nut/threaded portion that fights every turn of the nut as it is "gripping" the nut and trying to twist around the cable.
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If you want to locate sounds you can get a piece of hose like a 5/8 inch heater hose and hold it up to your ear and move it around the suspect area. It can help amplify the hissing.
On the choke nuts, WD-40 or soapy water would help them spin better and dry up later.
It could sound different maybe as you pull the chokes because the plenum is leaking a bit and the chokes change the air flow inside the venturi. Maybe ???

It is safer not to drink and ride and/or drink and wrench !!!
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