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Evolution of a Hot Rod - Part 1: The Stocker (Read 320 times)
DragBikeMike
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Re: Evolution of a Hot Rod - Part 1: The Stocker
Reply #15 - 05/08/21 at 18:39:06
 
I checked all the valve springs to make sure they were in good shape.  They were all about 55 pounds @ 1.3”.  Same as a brand-new spring.  This little spring tester is killer.  I love it.
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DragBikeMike
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Re: Evolution of a Hot Rod - Part 1: The Stocker
Reply #16 - 05/08/21 at 18:40:15
 
I restored the carburetor to the stock configuration.  That meant any mods I had done previously had to be undone.  I used a new retainer plate to cover up the extra hole I drilled in the slide.  The special retainer plate is shown on the left.  Leaving out the third notch results in the extra hole being covered up by the plate.
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Re: Evolution of a Hot Rod - Part 1: The Stocker
Reply #17 - 05/08/21 at 18:41:05
 
The special slide needle with the compound taper had to go.  A stock 5C39 needle went in.  I knew mid-range would be grossly lean, so I installed a .063” thick washer in lieu of the stock .110” washer.  That raised the needle .047” (slightly over 1mm) so that at least I could ride the bike without it lurching and bucking.  It wouldn’t be any faster at WOT, it would just have better manners when trying to cruise.  The black washer is the one I installed.
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DragBikeMike
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Re: Evolution of a Hot Rod - Part 1: The Stocker
Reply #18 - 05/08/21 at 18:41:48
 
My OEM carb already had the mixture screw plug removed and I wasn’t about to put that back in.  I set it at two-turns, which is where I found it when I first removed the plug 3 years ago.
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Re: Evolution of a Hot Rod - Part 1: The Stocker
Reply #19 - 05/08/21 at 18:42:31
 
All jets were restored to stock.  Main jet #145, pilot jet #52.5, small air bleed #45, large air bleed #230.

Float level was checked.  It was 28mm.  Perfect.
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Re: Evolution of a Hot Rod - Part 1: The Stocker
Reply #20 - 05/08/21 at 18:43:15
 
It wouldn’t be a proper stocker without a grossly restrictive induction system.  A stock airbox was in order.
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Re: Evolution of a Hot Rod - Part 1: The Stocker
Reply #21 - 05/08/21 at 18:43:58
 
It had to have a snorkel.
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Re: Evolution of a Hot Rod - Part 1: The Stocker
Reply #22 - 05/08/21 at 18:44:31
 
And the crankcase breather system had to be connected to the airbox.  Nothing like a healthy dose of crankcase vapors to wake that puppy up.
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Re: Evolution of a Hot Rod - Part 1: The Stocker
Reply #23 - 05/08/21 at 18:45:34
 
I figured one good turn deserves another.  If I was gonna choke that sucker, I might as well plug up the other end too.  The modified stock muffler had to be returned to the OEM configuration.  That meant my special ¾” transit tube had to be removed and capped off.

This would be the tube in question.  The stock internal tube is just about ½” ID.  With this ¾” ID external tube added, the flow path is a lot less restrictive.  Can’t have that.  Rip it off.
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Re: Evolution of a Hot Rod - Part 1: The Stocker
Reply #24 - 05/08/21 at 18:46:22
 
And plug it up.
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Re: Evolution of a Hot Rod - Part 1: The Stocker
Reply #25 - 05/08/21 at 18:46:58
 
That big 26.5mm exit tube had to go too.  It got replaced with the stock 20mm tube.  Factory fresh.
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Re: Evolution of a Hot Rod - Part 1: The Stocker
Reply #26 - 05/08/21 at 18:47:35
 
Just imagine 40 cubic inches of throbbing red-hot gas squeezing out of this little anus 3000 times per minute.  Oh my!
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Re: Evolution of a Hot Rod - Part 1: The Stocker
Reply #27 - 05/08/21 at 18:48:14
 
The exhaust system just wouldn’t be complete without that special 1.3” diameter header pipe.  Looks mighty BIG on the outside, but it’s teeny-weeny on the inside.
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Re: Evolution of a Hot Rod - Part 1: The Stocker
Reply #28 - 05/08/21 at 18:48:40
 
A quick test on the trusty flow bench showed that the stock muffler wins the restriction contest hands down.  It pulled a whopping 46.5” H2O.  In contrast, the modified muffler pulled 42.5” and the Dyna pulled 41”.
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Re: Evolution of a Hot Rod - Part 1: The Stocker
Reply #29 - 05/08/21 at 18:49:29
 
The planned slowdown wouldn’t be complete without some additional rotating mass.  So, the special 3” flywheel had to go.  The 15-ounce flywheel was replaced.
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