We’ve all heard the saying – “There’s no replacement for displacement.” Motorcycle USA took this to heart on the Motorcycle Superstore Harley Road Glide project bike. For those who haven’t heard about it, be sure to check out our Motorcycle Superstore Project H-D Bagger article to bring you up to speed. For this installment, Mark Daley of Thunder Struck Custom Bikes has thumbed through the pages of the 2012 Biker’s Choice catalog for his wish list and then began to tear into the engine.
Now, the stock Harley Road Glide Twin Cam 103 is a powerful mill in its own right, but we’re overhauling the trusty Road Glide to give it a more of a hot rod look and feel, so we decided to swap out the stock heads for an S&S Cycle 106” Big Bore Kit. The kit includes the largest bore S&S feels can be safely used in a cylinder with a stock spigot O.D. The kit contains a piston set with rings, top end gasket kit, those beefy S&S cylinders we just talked about, and full instructions for installment. The S&S 106” Big Bore Kit is available with the same silver or black wrinkle powdercoating as stock, so it’s easy to match the stock finish of your engine. S&S has attempted to make the swap as easy as possible because installation of the Big Bore Kit doesn’t require rebalancing of the flywheel or boring of the crankcases.
(L) Besides the S&S 106″ Big Piston Kit, we swapped out the cams, fueling cam plate, lifters and oil pump on the Motorcycle Superstore Road Glide. (M) The new jugs for the Motorcycle Superstore Road Glide slip right into place. (R) The S&S 106” Big Bore Kit is available with the same silver or black wrinkle powdercoating as stock, so it’s easy to match the stock finish of your engine.
Since we’re swapping out pistons and cylinders for the Motorcycle Superstore Road Glide project, we figured new cams and pushrods were in order too. For this we sourced a set of S&S 585 Chain Drive Easy Start Cams and an S&S 585 Easy Start Chain Drive. This required a new fueling cam plate as well. The only hiccup was the head bolts were too short and no bolts were provided for the S&S Kit, so Daley used another set of four stock Twin Cam long bolts instead.
An S&S Quickee Pushrod & Cover Kit was also installed, the kit consisting of a Quickee pushrod kit, chrome pushrod covers, O-rings and cover keepers. It is designed to allow for installing without removing the gas tank, rocker assemblies or tappet covers, but Daley pulled off the tank anyways so it could go to the painter and make access a little easier. To top it off we went with new S&S Chrome Rocker Covers, which come with Viton O-rings and all the necessary hardware and gaskets included. With the 106” Big Bore Kit and 585 Cams in place, S&S says we can expect 98.7 hp and 110.8 lb-ft of torque to the back wheel according to their dyno. We haven’t dynoed the bike ourselves because it’s still pieced out but will take S&S’s word for it.
49-3889 S&S Pushrod & Cover Kit $224.95
49-8599 S&S Billet Tappet Covers $199.95
49-6181 S&S 585 Chain Drive Easy Start Cams $358.95
04-1758 Gardner-Westcott Polished Cam & Primary Cover Set $85.49
49-9553 S&S 585 Easy Start Chain Drive $306.95
49-5660 S&S 106” Big Bore Kit $776.95
49-3099 S&S Super Stock 89cc Cylinder Heads $1154.95
49-5421 Fueling Gear Drive Oil System Kit $799.95
03-0093 PC Racing Flo Stainless Steel Reusable Spin On Oil Filter $109.95
62-3385 Kerker 2:1 Supermegs (Black Ceramic) $829
Thunder Struck One-Off Air Cleaner – (ask Thunder Struck’s Mark Daley if you’re interested in one).
Motorcycle Superstore Road Glide Engine Mods Total – $5447.95
With bigger pistons thumping in larger cylinders, a new fueling oil pump kit was in order as well to keep those jackets cooled, so Daley hooked up a Fueling Gear Drive Oil System Kit for the project. A PC Racing Flo Stainless Steel Reusable Spin On Oil Filter was installed as well. Made from medical grade 304 stainless steel micronic filter cloth, the PC Racing Spin On Oil Filter is one of the one of the most high tech filters available in the V-Twin market. With magnetic pre-filtering and a billet aluminum filter case that doubles as an oil cooler, we’re confident the system will keep heat of the pumped up air-cooled powerplant in check.
The one-off custom air cleaner Daley made for the build will help feed the mill more air in addition to adding to the hot rod aesthetic of the bike. Ditto for the set of Kerker 2:1 Supermegs in Black Ceramic that replace the stock pipes. Now the motorcycle’s intake and exhaust are both dialed in to handle the added engine output.
The coup de grace is the paint. The engine covers have been sent out for a coating of Gun Metal Grey Ceramic. We’re aiming for flatter tones on the Motorcycle Superstore Harley Road Glide project, hence the Black Ceramic pipes and the Gun Metal Greys used in the design so far.
We’re itching to fire this baby up and take it on a ride so we can hear those Kerker’s barking and see if we can spool up that bike tire and leave some black streaks on our local roadways, but the bike is still on the lift undergoing its transformation. There’s still air ride suspension to be put on, a new Ness contrast-cut fork to be installed, and a conversion from a closed chain primary to an open belt-drive primary to be done, so stay tuned for the next update on our 2012 Motorcycle Superstore Harley Road Glide project.