Motorcycle Engine and Transmission Repair

1967 Triumph Bonneville Carburetor Issues

A reader seeks help with his 1967 Triumph Bonneville running rough.

Hard-Starting Yamaha SR500

Keith tries to help a reader whose early 1980s Yamaha SR500 has a hard time starting.

Engine Life for a 1984 Yamaha FJ1100

A reader asks Keith how long the engine for his 1984 Yamaha FJ1100 will last before a complete engine rebuild.

Norton Commando Roadster Idling Problem

A reader's Norton Commando Roadster is in excellent condition except the left cylinder, which doesn't fire regularly at idle.

Rear Brake Master Cylinder for a 1983 Kawasaki GPz750

A reader seeks help in finding a rear brake master cylinder for his 1983 Kawasaki GPz750.

Rebuilding Ewarts Gas Taps

Keith Fellenstein advises a reader who wants to re-cork his old Ewarts gas taps.

1980 Yamaha XS850 SG Heat Problem

A reader's 1980 Yamaha XS850 SG runs fine until it warms up. Keith Fellenstein offers a few possibilities into why this is happening.

Adjusting 1977 Suzuki GS750 Valves

We go through the often-neglected process of adjusting the valves on a 1977 Suzuki GS750.

1968 Honda CL450 Cylinder Problems

A reader thinks the cylinders on his 1968 Honda CL450 are out of round and seeks help.

1965 T100 Triumph Smoking Cylinder

A reader got his T100 Triumph running, but the left side cylinder smokes badly.

1988 Suzuki Cavalcade Carburetors

Keith Fellenstein tries to help a reader whose 1988 Suzuki Cavalcade spits back through the carburetors.

More Power for a 1973 Hodaka Wombat

A reader's Hodaka Wombat has difficulty going faster than 35 mph.

Bajaj Caliber Fouling Spark Plug

A reader needs information on what could be causing fouling spark plugs on his Bajaj Caliber.

1978 Triumph T140E Ignition or Carburetion?

A reader seeks help with his 1978 Triumph T140E, which has timing issues.

1972 Triumph T100 Valve Issues

A reader suspects a burned valve on his 1972 Triumph T100, which has no power.

1968 Yamaha YR2C Clutch Issues

A reader seeks help with his Yamaha YR2C, which has a clutch that's heavy to operate.

Choke Needed on a 1988 BMW R100RT

A reader's 1988 BMW R100RT has been sitting for years and won't run after the choke is turned off.

Replace Pre-Unit Royal Enfield Primary Chain

The primary chain, hidden behind the primary cover, plays an important role in your powertrain and will need to be replaced eventually.

Setting the Points

Keith Fellenstein attempts to help a reader trying to set the points on his Triumph T140 Bonneville engine.

Fouled Spark Plug

Keith Fellenstein explains what might be causing a fouled spark plug for a Yamaha XT500.

BSA Royal Star Jumping Out of Gear

Keith Fellenstein offers an explanation as to why a reader's bike is jumping out of gear.

Rebuild Honda CB350 Keihin CV Carburetors

We'll show you how we cleaned our project Honda CB350's Keihin CV carburetors.

Stiff Clutch on a Norton Commando

Motorcycle Classics’ tech expert Keith Fellenstein explains why a Norton 850 Commando might have a stiff clutch.

Replace Suzuki GS1100 Clutch Plates

Give your clutch the attention it deserves by replacing the clutch plates.

Synchronizing Carburetors

Motorcycle Classics’ tech expert Keith Fellenstein discusses different methods of synchronizing carburetors.

Triumph Trident Cylinder Removal

Motorcycle Classics’ tech expert Keith Fellenstein offers advice on how to remove odd nuts and fused piston rings on a Triumph Trident engine.

Honda GL500 Carbs

Motorcycle Classics’ tech expert Keith Fellenstein talks about cleaning Honda GL500 carburetors.

Pressure Check a 2-Stroke Engine

Other than checking compression, carburetion and ignition, the most important test to run on a 2-stroke engine is a leak-down test.

Synchronize Carburetors on Small Honda Fours

If you can confidently tune your bike, you can probably handle synchronizing carburetors.

Tune Up a BMW /5 Airhead Engine

It won't take much time or money to complete an old airhead engine tune-up.

1973 Yamaha RD350 Crankshaft Replacement

A crankshaft replacement on our Yamaha RD350 was overdue, but fortunately it was not as expensive or difficult as you might think.

Adjust the Valves on BMW /5 Airhead Engines

BMW /5 valve adjustment is very straightforward and easily within reach of the novice mechanic.

1969 B44 BSA 441 Shooting Star Popping Exhaust

Motorcycle Classics’ tech expert Keith Fellenstein addresses the possibility of a lean idle mixture from the carburetor of a 1969 B44 BSA 441 Shooting Star.

1970 Yamaha XS650 Tune Up

Motorcycle Classics’ tech expert Keith Fellenstein discusses timing a cylinder for a 1970 Yamaha XS650.

Blown Clutch on a Kawasaki H1 500

Motorcycle Classics’ tech expert Keith Fellenstein discusses clutch problems on a 1975 Kawasaki H1 500.

Triumph Bonneville T120 Stumble

Motorcycle Classics’ tech expert Keith Fellenstein discusses a potential compression issue on a 1965 Triumph Bonneville T120.

Set of Pliers by Motion Pro

New stuff for old bikes: Set of pliers for master link clips from Motion Pro.

Replace Honda CB175 Camshaft Bearing Blocks

Learn how to replace camshaft bearing blocks on Honda CBs.

Carburetor Floats: Honda CB1100F

Motorcycle Classics’ tech expert Keith Fellenstein helps solve an issue with carburetor floats on a Honda CB1100F.

Mikuni Carburetor Mixture Setting

Motorcycle Classics’ tech expert Keith Fellenstein gives advice on setting the fuel/air mixture screw on a Mikuni carburetor.

Suzuki Madura: Hard to Start

Motorcycle Classics’ tech expert Keith Fellenstein troubleshoots hard-to-start 1985 Suzuki Madura V4s.

1976 Triumph 750: Hard to Kickstart

Motorcycle Classics’ tech expert Keith Fellenstein discusses fixes for a hard to kickstart 1976 Triumph 750.

Kawasaki F7-B: Torque Specs

Motorcycle Classics’ tech expert Keith Fellenstein shares torque specs for a 1973 Kawasaki F7-B 175.

Clean Aluminum Engine Block on BMW R75

Tips for polishing an aluminum engine block on a BMW R75/7.

Starting a 1963 BMW R69S in Cold Weather

MC Tech Corner expert Keith Fellenstein gives a reader advice on starting a 1963 BMW R69S in cold weather.