whirring or whooshing sound around tank?

[matty]

Guys-

Does anybody have a whooshing air sound around thier tank area (1997 VF750C2) when throttle is applied?

...even does it when stationary, whooshing sound goes up with more throttle application-

is this normal?

[Sledge Hammer]

What you might be hearing is intake noise. The snorkel for the air intake sits directly under the tank with the opening facing the rear of the bike. On mine it isn't terribly loud or else it is at a range of frequencies that I don't pick up well, but if the snorkel is not seated properly, the airflow might be disrupted enough to make it noisier than it would usually be.

[hootmon]

I do not hear it on my '94.
I would check the Snorkel as Sledge suggested.
There is also a breather box under the left chrome Faux air cover. That is supposed to have a filter on it, it may be the cause as well.

[matty]

Thanks for the responses guys, I forgot to add that I changes the air cleaner with the stock Honda part- had absolutely no effect on the noise. The snorkel simply slid forward into place- I'm not totally happy with the way the new air cleaner housing top and bottom half are meeting up- but I don't think thats the cause, again no change after the replacement

I will check the breather under the plastichrome faux air cleaner, thanks for the tip-

another thing I might try is a steathascope to pinpint exactly where it comes from. I don't think the bike would run as well as it does with a vacuum leak big enough to hear...

Has anyone ever run without the snorkel/ It seems very restrictive. I'm also interested in whats available for a less restrictive filter, but I'll do a search

[hootmon]

I have not tried it without the Snorkel, but Greg said he has known people that messed with it and could never get the calibration right afterwards and wound up having to put it back to stock.. So unless you have some good shop tools that will tell you air/fuel ratios and are willing to do a lot of jet swapping.. I'd leave it stock.. That's what I've read, right here on this forum..

[Sledge Hammer]

Has anyone ever run without the snorkel/ It seems very restrictive. I'm also interested in whats available for a less restrictive filter, but I'll do a search

Hopefully somebody with more knowledge on the subject will chime in and correct me, but I think the purpose of the snorkel and the reason why its opening points toward the rear is to reduce pressure variations at the intake due to ram effect

[hootmon]

Hopefully somebody with more knowledge on the subject will chime in and correct me, but I think the purpose of the snorkel and the reason why its opening points toward the rear is to reduce pressure variations at the intake due to ram effect

And probably to keep the rain out..

[Greg Cothern]

Your both correct.

DO NOT alter the snorkle or airbox in anyway or you will have a lot of work trying to figure out how to get your fuel/air mixture tamed back to proper operational ranges.