Motorcycle Engine and Transmission Repair

Norton Commando Q and A with Keith

This issue Keith answers Norton Commando questions on running too rich, jets and needles, and hearing more about using a TwinMax.

Electrical, 2-Strokes, Misfire and Carb Issues Q and A with Keith

1978 Triumph T140 electrical issues, reviving 2-strokes, Suzuki misfire, and more carb issues are this month’s featured questions Keith answers.

Replacing the Clutch Friction Discs on a Honda CL450

Replacement of clutch friction discs probably isn’t as difficult as you think it might be. We will walk you through the steps on a Honda CL450.

Suzuki TS185 Suggestions

Several readers try to help the owner of the Suzuki TS185 from the November/December 2019 issue with his jetting problem.

Kawasaki GPz550 Carburetor Suggestions

A couple of readers chime in on the Kawasaki GPz550 problem from the November/December 2019 issue.

1976 Suzuki GT750A Cylinder Problem

A reader’s Suzuki GT750A loses all power on one cylinder. Is this an ignition issue or a carburetor issue?

1978 Kawasaki KZ650C Mikuni Mixture

A reader seeks advice on setting the mixture on the Mikuni carburetors on his Kawasaki KZ650C.

Kawasaki GPz550 Carburetor Troubles

A reader is frustrated with his 1982 Kawasaki GPz550, which starts to die when the throttle is opened.

Suzuki TS185 Jetting Issue

A reader’s 1975 Suzuki TS185 runs nice, but starts to have problems when it approaches full throttle.

Suzuki T20 Piston Kit

A reader is trying to locate pistons for his 1966 Suzuki T20 Hustler. What are his options?

Adding a Carb Gantry to Your Norton Commando

A carburetor gantry isn’t necessary but it is a convenient modification and can provide a personal touch to a Norton Commando.

Triumph T100 Plug Fouling

A reader’s Triumph T100 keeps fouling its plugs and he assumes it’s oil. Does Keith have a different perspective?

Ethanol Gasoline and Fuel-Injected Bikes

A reader is curious as to whether fuel-injected bikes are more resistant to the negative effects of ethanol than other motorcycles.

The Aermacchi Project, Part 7: Serendipity Strikes Again!

Fortune smiles on Margie Siegal as she figures out why her Aermacchi's clutch isn't working.

1985 Suzuki Madura Fuel Pump Issues

A reader needs to find a new fuel pump for his Suzuki Madura. Can he locate a suitable replacement?

Adding an Oil Thermostat to Your BSA/Triumph Triple

Are you looking to add a transmission thermostat to your older BSA or Triumph triple? We show you how to install two different units.

The Sea Beast Saga, Part 4: Better, Faster, Stronger

Over the course of the last three months, the Sea Beast has received a number of upgrades with Shane Powers rushing to complete it in time for the AHRMA race in June.

The Aermacchi Project, Part 6: In Which the Motorcycle Angels Come Through

Margie Siegal needs to remove the clutch cover on her 1973 Harley-Davidson 350 Sprint but there's one problem: The tool needed for the task is near impossible to find. Can she find a substitute?

The Aermacchi Project, Part 5: Fear of Plating

When the fear of plating and "all you have to do" equals two hours of swearing at your Aermacchi restoration project.

1974 Norton 850 Commando Starting Problem

A reader’s 1974 Norton 850 Commando has been harder to kick over ever since a new reed valve was installed on the breather hose.

1968 Cimatti C100 Magneto Mystery

May/June 2019, Graham Quisenberry, Keith Fellenstein, Tech Corner

Suzuki TC185 Timing

A reader has strong spark on his Suzuki TC185 but it still won’t fire.

The Aermacchi Project, Part 4: Cleaning Up — and/or Shopping

Margie Siegal takes the next step in restoring her Aermacchi, but it's not an easy task finding and cleaning parts for her carburetor.

The Aermacchi Project, Part 3: Moving a Head and Making Tools 101

Margie Siegal moves on to the next step in restoring her Aermacchi by making her own wrenches to remove the nuts keeping the head down.

BSA M50MX Under Water

A reader has a 1972 BSA M50MX that sat under water for several days in a flood. Can it be revived?

1974 Honda CB550 Petcock Questions

A reader is having problems with the petcock on his 1974 Honda CB550. Replacing it with a 1975 petcock can solve the problem, but isn’t desired.

Triumph Bonneville T140V Hard to Start

A reader’s 1978 Triumph Bonneville T140V has had its engine completely rebuilt, but won’t idle when cold and has trouble idling when stopped.

Honda VT1100 Hydraulic Clutch Question

A reader used to cable-operated clutches asks Keith Fellenstein if the hydraulic clutch on his Honda VT1100 is acting as it should.

Stuck 1969 BSA Victor Engine

A reader who lost interest in his BSA Victor wants to get the engine turning again and comes to Keith for help.

1976 Honda 360T Carburetor Trouble

A reader’s Honda 360T that had recently been tuned up is fouling its spark plugs. Is the carburetor to blame?

Suzuki TC185 Carburetor Jetting

A reader needs information on the correct carburetor setup for his Suzuki TC185 and where to buy the appropriate jets.

Pinging Noise in a Kawasaki 350 S2A

A reader hears a sound coming from cylinder No. 3 on his Kawasaki 350 S2A. What could it be?

Yamaha SR500 Petcock Challenges

A reader wants to replace his vaccum fuel petcock for a gravity-style petcock without replacing the tank.

Seized Cylinder on a Suzuki GT550

A reader needs advice on how to free up a seized cylinder on a Suzuki GT550 he has a chance to buy.

Norton Commando Clutch Setup

A reader comes to Keith about his 1975 Norton Mark III Commando’s clutch.

Autolube Oil Mix Ratio Questions

A reader asks Keith Fellenstein his thoughts on reducing the oil mix ratio on the Autolube oil system.

Pitted Master Cylinder Fixes

A couple of readers inform Keith of places that offer cylinder services for Hondas.

Honda CBX Master Cylinder Repair

A reader asks Keith for advice on repairing the master cylinder on his Honda CBX.

Triumph Thunderbird 6T Fouling Plugs

A reader is having trouble with fouling plugs on his Triumph Thunderbird 6T and turns to Keith for help.

Honda CL350 Gearing

A reader wants his 1973 Honda CL350 to get fewer revs at speed and needs to choose between sprockets.

Yamaha XS650 Hard to Kickstart

A reader has trouble kickstarting his Yamaha XS650, which has no trouble starting on the button.

Replace Norton Commando 850 Clutch Plates

We install new clutch plates on a Norton Commando 850.

DIY Norton Clutch Hub Compressor

Although clutch hub compressor tools are reasonably priced, you can easily make one yourself at a minimal cost.

Rebuild Ducati Mikuni BDST Flat Slide Carburetors

Mikuni BDST flat slide carbs are easy to rebuild, and parts are readily available, if you know where to look.

1974 Honda CB550 Carburetor Issues

A reader has been experiencing carb problems with his 1974 Honda CB550 and has a battery charger question.

Rebuild BMW R75/5 Bing CV Carburetors

We rebuild a set of Bing carburetors off a 1973 BMW R75/5.

1968 BSA A65 Head Gasket Troubles

A reader's 1968 BSA A65 is leaking oil and he wants to know the best way of annealing the copper head gasket.

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.

The sound and the fury: celebrate the machines that changed the world!

Motorcycle Classics JulAug 16Motorcycle Classics is America's premier magazine for collectors and enthusiasts, dreamers and restorers, newcomers and life long motorheads who love the sound and the beauty of classic bikes. Every issue  delivers exciting and evocative articles and photographs of the most brilliant, unusual and popular motorcycles ever made!

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