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Often wondered, never did anything about it.
Find the last pressurized bearing in the engine's flow path.
Tap the end of the passage.
Install an OP warning light.
Time how long it takes for the...

I assume the original bushing is bronze, not brass?
The service life of a plain bushing (given adequate size, speed, and lubrication) is much greater than a needle bearing (defined as a roller with...

I think we agree that if 50 has worked for 80 years it's a safe choice today, in that with the known bearing loads, pump delivery rate and pressure, and temperature nothing better has been found.
My...

When going to see a bike for sale, try to get as much information as you can via e-mail (not phone). Post whatever you get ("it's fully rebuilt") here and frequently we can help detect fraud,...

My AJS 500 cost $200. My first 45 (basket case) came from Mel for $200. My first 1957 panhead cost $550. My 1969 NYC police bike cost $865. My 1966 Triumph Thunderbird 650 cost $995 - new.
At my...

W/r/t/ "the primary chain can take this much misalignment"
I can't diagnose your problem, but .080" is 5 X too much (I'd settle for 1/64" if I had to), something is wrong

Pretty sure it's JIS, I had a 1972 H2 750 2-stroke.
Caution: keep the original front fender if you have it, it directs air to the #2 cylinder.
Biggest service complaint: fouled plug, especially...

It's not technically difficult, it just involves careful measurement. Once you examine the seats closely, the reasons for the specific work will fall into place naturally, it's almost intuitive.
The...

The insert is larger than the original (1.75") seat OD, but the insert placement is not reliably concentric. When cutting the new seat the insert may expose the parent aluminum at one point, so the...

I've found embedded glass beads in the surfaces of carefully cleaned aluminum castings, and in other very bad places (behind races, blind threaded holes, inside oil passages, snap ring grooves,...

Oil sounds really good, since the oil level will be a large function of the piston motion, by the ratio of the bore^2 ÷ tube^2. If the bore is 3.25" (Chief) and the tube ID is 1" the oil will rise...

The difficult thing to do is... when, exactly, does the piston stop?
There is probably .0005" each worth of pin and big end clearance that will reverse to hide crank rotation: the piston won't move,...

It can find TDC, but (unless you know that the spark plug thread is vertical) don't use it to set spark advance.

Replacement lower case, replacement engine number, both?

Sorry, I can't help with the original question, but what throttle disc and venturi diameter is the M9?

The parts with flats on opposite sides are axle sleeves.

??????????

you'll be sitting on at least a few items before they move at top dollar.

The good stuff will go immediately, and some part of the additional return (over selling it as a bike) will be on your...

The question used to be not "can they do good work?", but "will they do good work for you?".
Two different answers way too common.

Only 1937 U, UL cylinders are 3-5/16" bore (3.3125", same as EL) as always for 74" U, UL, but use the 120-37/371 13 fin casting otherwise only found on 1937-41 80" UH, ULH with 3-27/64" bore...

"W" is not weight, it's winter: the oil viscosity when it's cold = 23° F.
Just a rumor: "The 1st number in the oil viscosity is the time it takes, in seconds, for cold oil to reach everywhere in the...

Early V-Twin heads are easy to identify.
Examine the gasket surface - is it flat, smooth, with no imperfections? That's not his.
His look like the gasket surface was prepared by dragging it across...

If there's any wiggle room, the shafts will try to approach each other, and the belt will march outward in its quest to hide in the grass.
Pay particular attention to the holes in the frame,...

Many belts are thrown by misalignment of the sprocket shaft and transmission mainshaft (which must be parallel).
The belt guide doesn't prevent this - but slices the belt to pieces as it passes by.

Do you have the correct carburetor including venturi and main nozzle?
Float material?
Float setting?
Vacuum leak (throttle shaft)?
Vacuum leak (manifold, nipples)?
Spark setting?
Plug gap?