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Author Topic: What about the best pre75 engine by weight and HP  (Read 10434 times)

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Offline EML

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Re: What about the best pre75 engine by weight and HP
« Reply #15 on: June 28, 2013, 07:21:12 am »
Yes, but what do they weigh and more to the point, what would they weigh with a primary cover and gearbox attached???
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Offline Tahitian_Red

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Re: What about the best pre75 engine by weight and HP
« Reply #16 on: June 28, 2013, 08:31:40 am »
Ossa Phantom 250 is pretty light for having such a large cylinder.  I'm under a lifting restriction or I would weigh it.  ;D
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The "Factory Novice"
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Offline Slakewell

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Re: What about the best pre75 engine by weight and HP
« Reply #17 on: June 28, 2013, 08:40:01 am »
Surely the only answer is the Yankee twin if one is going to fit an extra wheel
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Offline EML

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Re: What about the best pre75 engine by weight and HP
« Reply #18 on: June 28, 2013, 08:44:51 am »
I agree that the Yankee might be a good choice, except they don'e exactly grow on trees. I do have two Pioneer motors and a welder though :D
Sort of makes the RD350 sound good too as there is a few of them about.
A collegue has a 500 Yam twostroke twin from the sixties, though I don't think he would want it in a Wasp frame :)
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Offline Slakewell

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Re: What about the best pre75 engine by weight and HP
« Reply #19 on: June 28, 2013, 08:53:13 am »
You asked whats best you didnt mention achievable or price  ;D
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Offline EML

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Re: What about the best pre75 engine by weight and HP
« Reply #20 on: June 28, 2013, 09:27:02 am »
Quote from: EML on June 26, 2013, 04:51:06 pm
It can be 2 or 4 stroke (or anything else) but must be judged by power to weight and, just to add spice, it must be readily available and easy to service/maintain.
I leave it in your hands gentlemen. :)
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Montynut

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Re: What about the best pre75 engine by weight and HP
« Reply #21 on: June 28, 2013, 09:56:25 am »
Suzuki T500 / GT500 easy to get good power with a great power and torque spread, reliable, parts are good, strong after market supply in UK, easy to make very fast, compact and reasonably light. Should be a great MX SC engine. they were used in speedway sidecars from memory.

The early version may even be Pre68 but not sure
« Last Edit: June 28, 2013, 10:02:03 am by Montynut »
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Offline Slakewell

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Re: What about the best pre75 engine by weight and HP
« Reply #22 on: June 28, 2013, 10:00:08 am »
I had one of those early Suzuki 500 twins and they pulled like a tractor funnily enough I always said you could fit a side car to this thing.I think Brad Lewis still has it in his shed.
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Current bikes. KTM MC 250 77 Husky CR 360 77, Husky 82 420 Auto Bitsa XR 200 project. Dont need a pickle just need to ride my motorcickle

Offline shelpi

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Re: What about the best pre75 engine by weight and HP
« Reply #23 on: June 28, 2013, 11:34:40 am »
Quote from: Montynut on June 28, 2013, 09:56:25 am
Suzuki T500 / GT500 easy to get good power with a great power and torque spread, reliable, parts are good, strong after market supply in UK, easy to make very fast, compact and reasonably light. Should be a great MX SC engine. they were used in speedway sidecars from memory.

The early version may even be Pre68 but not sure
first T500's were manufactured in Japan in 1967 but were not shipped to Australia till early 1968, it could be bought up as a case with MA but I didnt take it any further and went for the T250 wich fitted pre 68 and with alot of flow on stuff ;) and yes Geoff Baran used the T500 with great success(speedway, Rolly Park)
to me the DT360A (400)is up there for best pre75 or TM400 itsa power to weight thing and of course application  Mx solo or sidecar etc:D
« Last Edit: June 29, 2013, 10:36:41 am by shelpi »
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Offline Tim754

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Re: What about the best pre75 engine by weight and HP
« Reply #24 on: June 28, 2013, 02:24:59 pm »
 In my reading of the context asked here.
Did I hear current availability of pre75 bikes, parts or modification bits??
 T500/GT500 Suzukis great powerful two stroke twins (shite standard gearboxes). May as well add the GT750 water cooled triples (same bore size and pistons..) Hard to find Bikes and parts.
 Long stroke Jawa's 500's  and J.A.Ps with or without gearboxes attached , Ossa Phantoms, Maico 501's and 440's, Yankee twins, crikey Kawasaki 350 Viagra horns. All fabulous machines BUT finding the said machines or parts in any quantity ...................... ::)
Early Yamaha two stoke twins series like YDS, R5 DS7 RD yep the bits are about, getting them off the Post classic Road Racers be sticky.
Early Yamaha four stroke twins series like XS650 now your thinking with sense. TX650/750 a decline in standards, TX500 pus from a warthogs anal sores...
DT400 are not pre75   You have to get the DT360 or earlier RT's ;) they  really are about lots of leg snapping fun though!!!
TM400 and SC500.....you got lots of patience or a death wish...
Kawasaki Z900...your wallet has got lots of patience or a death wish.

 Back to beloved  SOHC Honda CB750 K and F series . The ubiquitous* one sold squillions all over world and still has companies making parts, standard or hot up for them.   :)

ubiquitous* means every bloody ware like Indian telemarketers :D

« Last Edit: June 28, 2013, 03:48:44 pm by Tim754 »
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Offline GD66

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Re: What about the best pre75 engine by weight and HP
« Reply #25 on: June 28, 2013, 03:05:17 pm »
Quote from: EML on June 28, 2013, 08:44:51 am
A collegue has a 500 Yam twostroke twin from the sixties     :)



Really ? Tell us more.   ???
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Offline Tim754

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Re: What about the best pre75 engine by weight and HP
« Reply #26 on: June 28, 2013, 03:33:45 pm »
Ditto that and a piccy or two would be interesting ;)
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Offline Slakewell

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Re: What about the best pre75 engine by weight and HP
« Reply #27 on: June 28, 2013, 03:44:27 pm »
I took this rather bad photo at my mates place the other day of this old works bike. I'm sure this engine could power your third wheel contraption. Be pre 68 as well.

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Offline GD66

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Re: What about the best pre75 engine by weight and HP
« Reply #28 on: June 28, 2013, 03:59:24 pm »
Looks more like the cotton-reel spools of a Vincent twin-drum front end. Then there's the pipes....so yes, probably pre-'68... ;D
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Offline jimg1au

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Re: What about the best pre75 engine by weight and HP
« Reply #29 on: June 28, 2013, 04:10:21 pm »
more likly pre60
didnt mention black shadows
picture tells all
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