Panther heavyweight engine build: Part 2

Complete crank to rocker box assembly of a P&M Panther Model 100 engine. Part 2: the top end.

[@christopherdewhurst8812]

Arguably one of the nicest single cyclinder engines ever made

[@dozerblade]

it's nice the engine has that flat sump so that it sits there demurely whilst you work on it.

[@ktmtravels3727]

Thanks again for producing these.

[@nigelweaving9045]

I have watched both of the videos and am impressed by your knowledge and the care taken to build this wonderful piece of motorcycle history. Well done and I look forward to the next episode.

[@bobp3390]

Nicely done by a man who knows exactly what he is doing .. Good to see it well assembled with a few squirts of oil in just the right places too !

[@notwocdivad]

Very entertaining and informative thankyou. One thing that really struck me was the attention to cleanliness during the build, After seeing video's from other countries where so called mechanics leave parts like chains and crankshafts and even crankcase halves with machine faces lying on the back streets, it is good to see a REAL mechanic at work!!!

[@mikeburton7077]

That was very helpfull , I have a 57 cub and a 65 ss80 ,I'm really considering a Panther as my next project .

[@andrewhenzell4795]

Love your dry sense of humour, don't own a Panther, but a close mate has a '29 M100 that I have made parts for. A question I have is about timing the magneto as shown on your video. You do the final timing on the points plate of the magneto, rather than through the timing gears. My understanding is that the point opening timing is set by being close to the maximum change in flux of the rotor, the "stiff" part felt when rotation the rotor by hand, wanting the points to open close to the "stiff" point to get a high low voltage, primary, current. All my magnetos have the points plate keyed to the rotor shaft for this reason. By adjusting the timing as shown, it can have a weak spark from low primary voltage. I like the engineering Panther has done that allows the mag dyno to be removed and reinstalled without having to retime it every time, but only if it is timed correctly on the timing gear side as part of the instilation process, or so it seems to me anyway. My oldest bike is a '33 Triumph silent scout model BS 500 single. Looking forward to more of the same video wise, interested in how you attack the tank :-)

[@peterjrgensen2803]

Wow. Very clear speech, informative and super video quality. I wish I had seen this video before restoring my engine.

[@TheYorkie1954]

excellent stuff, but I doubt I'll ever have a Panther

[@glaicogobbo4046]

I really appreciate the excellent video! I didn't know anything about that engine.

[@dogfeathers5646]

Excellent video, well narrated and explained in detail. I do not have a Panther but your careful techniques are applicable to many other engine assemblies. Great job!

[@HowardKelsey68]

Nicely done, sir. Just a possible tip offered here regarding the slightly-shrunken paper gasket dilemma. While rebuilding a client's WWII H-D WLA, Mr. Keenan Tatro of Tatro Machine, expanded a vintage, dried-out gasket by dropping it the loo for a few minutes. He then patted it dry and it fit perfectly! As an aside, I can only presume the contents of his shop's toliet bowl was fresh water. I'm not sure an actual bathroom fixture is required, either. Perhaps one's pet dog's water dish would suffice. Or, depending on the make of motorbike and quality of the build, a mouth full of beer might moisten the fibers! I'm no mechanic however, so I shouldn't say. Anyway, thank you for the wonderful video. It is truly a pleasure watching a gentleman at work. Cheers from across the pond.

[@PantherOwnersClub1]

Thank you Howard for your enthusiastic input. Of your suggestions I have put the mouthful of beer last on my list for experimentation.

[@keithgarland3404]

Very enjoyable, relaxing and informative.

[@brockett]

Thank you for sharing your knowledge and skill.

[@malcolmduckett1626]

Well done, what an excellent video... thank you

[@MBIKES21]

Great video,well done young man.

[@heathernarramore773]

Superb.You are a wordsmith,Sir. Thoroughly enjoyable.

[@PantherOwnersClub1]

Many thanks Heather.

[@terencelinton1056]

Excellent video, watched both parts, full of information

[@stevewhittaker5933]

Excellent informative video.

[@rainbowmat8204]

A very good work sir, i saw your videos with keen interest

[@johnmullen1955]

excellent instructional video well filmed and plenty of good advice.well done one of the best i have seen.

[@PantherOwnersClub1]

Thank you John. Encouragement to tackle a gearbox perhaps?

[@CarBoreBoy]

@@PantherOwnersClub1 Allow me to chip in here with a resounding '"yes!"

[@leehartung2814]

How many miles can you expect between builds? Is a car piston better? I heard people often use a piston from a volvo, if I remember right?

[@PantherOwnersClub1]

17,000 miles on my 1955 rigid frame Model 100 since rebuild lee. The engine is affected by piston-slap now but still running well on a Panther Hepolite piston. Use of Volvo or Rover car pistons is common since supplies of originals dried up.

[@johndennis9964]

Really enjoy your instructive and entertaining film. Asking what is probably and naïve question but why are their two exhaust pipes on a single?

[@jonathanjones9790]

Thank you for your interest John. P&M used twin-port heads on heavyweights from the late 1920s to the firm's end in the 1960s simply to impress buyers. Single port heads were an option for sidecar use, where the left hand pipe is not seen and gets in the way of fittings, but these are rare.

[@joewardle3809]

Thanks for the excellent video, very informative. When will the next video of the complete engine getting installed be uploaded. Cheers

[@derekgee4223]

Absolutely agree

[@johnferguson40]

Watched the 2 vids now and feel complete, almost. Can I see it run someplace?

[@PantherOwnersClub1]

Thank you for your interest John. The engine was recently installed in a Panther and video of this is being edited as time permits. A first road run will follow, but talk among yourselves until then...

[@johnferguson40]

@@PantherOwnersClub1 Thanks so much.

[@TheYorkie1954]

could II ask your name in case I wish to comment on your excellent videos

[@PantherOwnersClub1]

You are right Peter to think my name isn't Panther Owners Club. It's Jonathan, just one of the club's eight hundred plus enthusiastic members. Thank you for your interest in the channel.

[@danielsantiago9719]

Dear Sir, I am from Sao Paulo-Brasil and I'm helping a friend of mine with the fully restoration of a 1952 Phanther M100 1952, from a basket of parts. We found two different sizes of valve springs: one short and The other longer. Would you help us with the correct measure for both strings? Thank you very much!

[@PantherOwnersClub1]

The best place for detailed information Daniel, if you are not a member of the Panther Owners Club, is probably the Panther FaceBook group here: facebook.com/groups/11553580477

[@TECHNOP.V.A.]

А какая мощность этого двигателя?

[@PantherOwnersClub1]

Заявленная мощность 23,3 л.с.

[@TECHNOP.V.A.]

@@PantherOwnersClub1 Thank you for the information 😁

[@rainbowmat8204]

sir how much a panther cost when it is fully restored

[@PantherOwnersClub1]

Almost impossible to give an answer to this MAT as all old bike prices have been on the rise in recent years. In 2021 a fully restored late heavyweight might sell for between £5,000 and £8,000, earlier Panthers much more. This seems shocking to those of us who bought ours for just hundreds of GB pounds, and not so very long ago.

[@rainbowmat8204]

@@PantherOwnersClub1 yes sir you are absolutely right, it takes a lot of patience, pain and money to restore an old bike.

[@thra5herxb12s]

Why is there no sound on this video.

[@jonathanjones9790]

No background music Dean, only speech with occasional silences to draw breath.