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Snod said :-
It is indeed an MC24 Nighthawk, the MC26 Two Fifty had cast Grimeca wheels and the front disc brake, and different ratios in the gearbox. Oh and a tacho instead of just some lights.
Glyn, I'm pretty sure you cannot fit the 250 barrels on the 125 cases without enlarging the holes for the liners to fit. The 125 also has a shorter stroke..
That Rebel is interesting, I don't recognise that clutch cover from anywhere!
26/06/2025 00:37:56 UTC
Ren - The Ed¹ said :-
Thank you Snod! Golly I thought I was a Honda nerd but you've well and truly out-nerded me there.
26/06/2025 10:54:21 UTC
Glyn said :-
First quick ride on the Yamaha TZR can be seen here. Turn the volume down Ren and it’s much better.
https://youtu.be/odrqv7gzcOE
01/07/2025 17:46:30 UTC
Ren - The Ed¹ said :-
I always knew you lived in a mansion in the countryside Glyn. Much better with the sound down, thanks.
01/07/2025 19:52:58 UTC
nab301 said :-
Sounds good Glyn, although would be much nicer near the redline!
Nigel
03/07/2025 16:26:20 UTC
Glyn said :-
We sailed through the MOT today without any advisories. That is with the TZR and so I'm off to the two stroke day at Sammy Miller's tomorrow. Naturally, I've packed as many tools as I can and am expecting to have to use them if this thing is as reliable as their hyped up (down) to be. Perhaps I can find a buyer there as I'm of a nervious disposition and am not happy to tempt fate with a long ownership. I was offered a Yamaha RD500 (Resto project) today.... good grief, the Ed would go nuts.
05/07/2025 18:02:21 UTC
Glyn said :-
Oh Ed, you’d have loved 2stroke day at Sammy’s Miller’s. There were a huge amount of smokers there from a very old Monet Goyon single cylinder twin exhaust port jobbie that was older than anyone there (including Sammy himself), up to the latest 2023 Langen (a snip at £37k). I arrived with the only TZR 250 and was surprised by the amount of photos taken of it. Here’s a picture of it next to a Suzuki GT750 triple ( known as a kettle), a TDR 250 and a Greeves at the rear.
07/07/2025 18:28:33 UTC
Ren - The Ed¹ said :-
Oh my goodness I had thankfully forgotten all about that! Phew that was a close escape I'm sure.
I'm pleased to hear you had a great day and the TZR was a popular star of the show. I'm familiar with the TDR which can trace it's heritage to your TZR, and I know why Kettles are called Kettles. However I feel no need whatsoever to hear ring-a-ding, smell burnt 2 stroke or listen to endless talk of power bands and decoking the top end.
Sharon and I covered 150 miles in the terrible rain and thunderstorms yesterday, today being dry and warm we have not turned a wheel. We're not quite right in the head I'm sure.
07/07/2025 21:46:52 UTC
Upt'North ¹ said :-
Glyn, she looks blummin lovely.
As does the black GT750 (A/B?) which looks like it's running expansions. Nice.
Upt.
07/07/2025 23:15:18 UTC
ROD¹ said :-
Looking fantastic Glyn,
I was looking forward to clouds of smoke for Ren's benefit.
Ren from your travel information (70 miles from Sammy Miller's and a 150 mile ride) I am guessing you are near the Cotswolds.
08/07/2025 09:31:34 UTC
nab301 said :-
Glyn , hopefully someone appreciates all the work you put into the TZR.
Nigel
08/07/2025 12:01:57 UTC
Ren - The Ed¹ said :-
ROD - erm yes but no but... We've been to see father on the south coast near Worthing. But we'd broken the trip into 2 days hence only 150 miles. But we're on our way back now and not a squillion miles from the Cotswolds.
It'll all become clear in another exciting tale soon.
08/07/2025 21:43:44 UTC
Glyn said :-
There has been some changes down here on the Southern outpost. I’ve sold the (rather lovely) BMMW scrambler and it’s making its way to Leicester in the next few days. However, I was busy immediately and purchased a Suzuki VS600 1995 Cruiser. I shall be picking it up next week.
12/07/2025 17:16:52 UTC
ROD¹ said :-
We will look forward to your next project.
The 600 Intruder was the Suzuki answer to Yamaha's 535 virago. Middle weight v-twin cruisers with shaft drive.
12/07/2025 18:29:15 UTC
Glyn said :-
From memory , (I haven’t looked it up) I think the Yamaha has a 70 degree v angle. I believe the Suzuki has a 45degree. This would make it sound more like a Harley. Ed knows this stuff, crank angles etc. I understand that V twin motorcycle engines have a zero degree crank angle as both cylinders share a single crank pin. Therefore, if the angle of the two cylinders is 45degrees then the rear cylinder must fire 45 degrees after the front cylinder. It gets more complicated when things like the Ducati V engine is 90 degrees. The Dragstar had the timing marks seemingly close together but they must have been 70 degrees apart. The full rotation of the engine is 720degrees so cylinder one fires, cylinder 2 fires 45 degrees later then cylinder 1 fires (720 - 45) 675 degrees after that. Hereby it starts all over again. I’ve rambled sorry.
13/07/2025 09:39:52 UTC
Ian Soady¹ said :-
Don't apologise, your ramblings are better than many people's "reasoned" postings......
13/07/2025 09:53:16 UTC
nab301 said :-
Looking forward to this one Glyn , I'll have to go down a rabbit hole of "V twin angles" to refresh my memory...
Nigel
13/07/2025 14:57:52 UTC
Glyn said :-
I seem to remember that the Dragstar I had didn’t really have that bang, bang,gap, bang, bang,gap sound of the Harley’s. It was a neck and neck purchase between the Suzuki and a Honda Shadow 600. The Honda owner was being a bit silly about his perceived value and when I was able to knock the Suzuki owner down by a couple of hundred that settled it. This is the first bike I’ve bought in years that had a current (very short) MOT. However, it’s not mint and needs some fettling.. I do believe that the British V twins of yesteryear did not share a crank pin but that’s a question for Ian I would think.
13/07/2025 15:45:29 UTC
Ian Soady¹ said :-
Oh go on then. Too hot to either be in the garage or on the bike.....
The most familiar British V twins would be the JAP (J A Prestwich) and competitors in the pre-war era and the Vincent twin early pre-war and post-war. Both had single crankpins with the big ends side by send meaning that the cylinders were slightly offset one from the other. I believe some manufacturers like Harley Davidson had one forked big end with the other running inside it, but still a single crankpin.
The story about the Vincent is that the designer, Philip Irving, was idly playing with the blueprints for the 500cc single which was the only engine they made at the time and realised that by putting one copy of the drawing reversed over the other he had the layout for a V twin. How true this is I don't know.
All above from my patchy memory so caveat lector.
13/07/2025 16:32:39 UTC
Glyn said :-
Great anecdote Ian. Sounds very feasible to me.
13/07/2025 21:27:23 UTC
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