 Home Made Bell Mouth
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Joined: Nov 2009
Posts: 3,236 Likes: 56
Loquacious
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OP
Loquacious
Joined: Nov 2009
Posts: 3,236 Likes: 56 |
Was tired of waiting for the snow to clear the past few weeks so I decided to make my own air intake to eliminate the stock snorkel. Crude but ABS is easy to work with and it was already in the house. I put it on today after the Spring oil and filter change and went out for a tour. Got the big BWAAAAA sound but there was a definite hesitation in the acceleration. Could be the 5 month old gas with stabilizer in it or maybe just not enough gas and needs a bigger jet. 
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Re: Home Made Bell Mouth
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Joined: Mar 2007
Posts: 5,616
Check Pants
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Check Pants
Joined: Mar 2007
Posts: 5,616 |
You will need bigger jets. Been there done that. People smarter than me will chime in with suggestions. 
SOLD: 07 Black BA, 39mm FCRs, TPUSA stage 1 head, TPUSA 813 cams, TPUSA 10.8:1 pistons, TTP #3 igniter, Specialty Spares Long Cannons, Tsukayu Hard Bags. 82HP/55tq
NEW: 19 Goldwing Tour DCT
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Re: Home Made Bell Mouth
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Joined: Mar 2005
Posts: 2,419
Oil Expert
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Oil Expert
Joined: Mar 2005
Posts: 2,419 |
My guess is being slightly leaner (your mod won't make a big difference in extra air) wouldn't cause the hesitation. I would blame the fuel or gunged jets.
Cheers, Richard
~~~~~~~~~~~~
09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge
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Re: Home Made Bell Mouth
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Joined: May 2010
Posts: 5,720
Check Pants
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Check Pants
Joined: May 2010
Posts: 5,720 |
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Re: Home Made Bell Mouth
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Joined: Jun 2011
Posts: 407 Likes: 2
Adjunct
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Adjunct
Joined: Jun 2011
Posts: 407 Likes: 2 |
I have been toying with that idea myself. My snorkel came out some time ago. Thanks for the inspiration to get busy now 
Last edited by MattyMo; 04/12/2014 8:18 PM.
09 America, some modifications
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Re: Home Made Bell Mouth
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Joined: Nov 2009
Posts: 3,236 Likes: 56
Loquacious
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OP
Loquacious
Joined: Nov 2009
Posts: 3,236 Likes: 56 |
Quote:
I have been toying with that idea myself. My snorkel came out some time ago. Thanks for the inspiration to get busy now
Cutting sheet ABS with a jig saw heats up the plastic too much and it just sticks itself together behind the blade. Either hand saw it with a coping saw or do a slow jig. 
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Re: Home Made Bell Mouth
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Joined: May 2010
Posts: 5,720
Check Pants
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Check Pants
Joined: May 2010
Posts: 5,720 |
If you really want to add some air and keep the box, open the bottom of the filter aligned to the box. I run 140s with a drilled box. The methodology has been covered many times on here, use the search function: drilled airbox..
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Re: Home Made Bell Mouth
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Joined: Jan 2005
Posts: 11,124 Likes: 13
Should be Riding
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Should be Riding
Joined: Jan 2005
Posts: 11,124 Likes: 13 |
Mid-range flat spot: Shims
Blowing gravel off rural roads
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Re: Home Made Bell Mouth
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Joined: Nov 2009
Posts: 3,236 Likes: 56
Loquacious
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OP
Loquacious
Joined: Nov 2009
Posts: 3,236 Likes: 56 |
I haven't had a chance to run through a full tank of the stabilized gas as the snow and ice came back for one more time. Its Good Friday, well in our case not a bad Friday but promises of better things to come. After its used up if the hesitation remains I'll try the shim(s).
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Re: Home Made Bell Mouth
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Joined: Nov 2009
Posts: 3,236 Likes: 56
Loquacious
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OP
Loquacious
Joined: Nov 2009
Posts: 3,236 Likes: 56 |
Found the easy instructions for doing the shimmy thing on Pat's(Dinqua) web site. 
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Re: Home Made Bell Mouth
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Joined: May 2008
Posts: 740
Adjunct
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Adjunct
Joined: May 2008
Posts: 740 |
I had the same issue(flat spot in acceleration). 1 shim fixed that.
I have the Polaris bellmouth on mine.The only advantage to the bellmouth is it stops the surging in high crosswinds. Other than that no difference in performance,IMHO
Bill.
"I spent a lot of money on booze, birds and fast cars. The rest I just squandered."
-George Best
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Re: Home Made Bell Mouth
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Joined: Nov 2009
Posts: 3,236 Likes: 56
Loquacious
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OP
Loquacious
Joined: Nov 2009
Posts: 3,236 Likes: 56 |
Local dealer wants $2.50 per shim what highway robbery! I was going to buy 4 just in case, $10 plus tax at 13% I think not just on principal. Fast Eddy sells 4 for 2.50 plus shipping and I am sure I can find something else I need from his catalogue not available here.
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Re: Home Made Bell Mouth
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Joined: Nov 2009
Posts: 3,236 Likes: 56
Loquacious
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OP
Loquacious
Joined: Nov 2009
Posts: 3,236 Likes: 56 |
The shim worked thanks for the suggestion and thanks again to Pat for posting the easy to do instuctions on his website. ( this site does not allow for opposing thumb salute.) As a test I put the snorkel back in to see if I had the same reaction to throttle response and did not so concluded it was not gunge in the carb.
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