Orange and black Harley-Davidson cruiser with a chrome V-twin and spoked wheels, the kind of bike Kings North Coast Customs tunes on the dyno in Astoria

Astoria, Oregon · Custom tuning · Harley-Davidson parts

Horsepower
is our goal.Motorcycle dyno tuning and Harley parts on the Oregon North Coast.

Fuel-injected street bikes go on the dyno: the bike runs on a machine that measures real horsepower while the shop adjusts the fuel map. Harleys first, every street bike welcome.

Book dyno time Call (503) 440-7402

Horsepower0.0 hp

Torque0.0 ft·lb

Sample dyno
readout

Parts finder · WPS dealer

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What the shop does

Three things, done right

Black-and-white close-up of a Harley-Davidson V-twin with a high-flow air cleaner and chrome pipes, the fuel-injected motor that goes on the dyno at Kings North Coast Customs

Dyno tuning

Anything fuel-injected goes on the dyno. The bike runs on a drum that measures real horsepower while the fuel map is adjusted, pull after pull, until it is right.

Tuning & dyno

Harley parts

Wholesale dealer for aftermarket Harley-Davidson parts through Western Power Sports. Exhaust, intake, cams, suspension, brakes, lighting, controls.

Parts finder

Mechanic with a socket set working on a motorcycle in a dim garage, the service side of Kings North Coast Customs in Astoria

Service & repair

Oil and fluids, tires, brakes, diagnostics and the install work that comes with new parts. Street bikes of every make.

Service

What a dyno is

The bike runs. The machine measures. The map gets fixed.

A dynamometer, the dyno, is a drum the rear wheel sits on. The bike runs through the gears on it while sensors read how much power actually reaches the wheel and what the engine is breathing. The tuner watches that chart and adjusts the fuel map, the table that tells the injectors how much fuel to add at every throttle position and rpm.

Baseline pull. The bike runs as it came in. That chart is the before.
Adjust. Fuel and timing are changed where the chart shows the engine lean, rich or flat.
Pull again. Repeat until the curve is smooth top to bottom and the numbers stop climbing.
Ride it home. Smoother throttle, cooler running, the horsepower your parts were supposed to make.

"It's the only shop on the West Coast with a motorcycle dyno," the owner says. Come see it for yourself.

How dyno tuning works

Sample charthp ft·lb

2,0003,0004,0005,0006,000 rpm

Street bikes we tune

Harley first. Everything fuel-injected after.

Harley-DavidsonOur favorite. Milwaukee-Eight, Twin Cam, Sportster, Softail, Touring.
IndianThunderstroke and PowerPlus, baggers and Scouts.
HondaGold Wing, Rebel, Shadow and sport bikes.
YamahaBolt, Star cruisers, FZ and MT.
KawasakiVulcan cruisers, Ninja and Z.
SuzukiBoulevard cruisers, GSX-R and V-Strom.
TriumphBonneville, Rocket 3, Speed and Street Triple.
BMWR-series boxers and S 1000 sport bikes.

Carbureted bikes still get service and repair; the dyno is for fuel-injected engines with a map to change.

Reviews

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"Horsepower is our goal."
The owner, Kings North Coast Customs

Questions riders ask

Straight answers

Do I need an appointment for the dyno?

Yes. Dyno time is booked in blocks so the bike gets a proper baseline, the adjustments and the final pulls without being rushed. Use the Book page, or call or text the shop.

What bikes go on the dyno?

Any fuel-injected street bike. Harley-Davidson is the shop's specialty, but Indian, Honda, Yamaha, Kawasaki, Suzuki, Triumph and BMW all get tuned. Carbureted bikes get service and repair, not a dyno tune.

I just put on an exhaust and intake. Do I need a tune?

Almost always. A freer-breathing engine on the stock map runs lean, which means heat, popping on decel and less power than the parts can make. A dyno tune matches the fuel map to the new parts.

Can you order the parts and do the install?

Yes. The shop is a wholesale dealer through Western Power Sports, so most aftermarket Harley parts can be ordered, installed and tuned in one visit. Ask on the Parts page or when you book.

How long does a tune take?

Plan on leaving the bike for the day. The baseline, the adjustments and the final runs take time, and the shop would rather do it right than fast. Call for an estimate for your bike.

Where is the shop?

92366 Juniper Rd Unit 1, Astoria, OR 97103, just south of downtown between Astoria and Warrenton. Open Monday to Friday, 8 AM to 5 PM.

Find the shop

Just south of downtown Astoria

Unit 1 at 92366 Juniper Road, between Astoria and Warrenton and a short ride from the Astoria-Megler Bridge. Riders come over from Seaside, Gearhart and Cannon Beach, and across the river from Long Beach and Ilwaco.

Kings North Coast Customs LLC
92366 Juniper Rd Unit 1
Astoria, OR 97103