...i thot so ...thats why i didnt buy a cb250in 1977 and opted for an RD....anyway ARE those enignes ..T500 titan engines cos the look very similar
...i thot so ...thats why i didnt buy a cb250in 1977 and opted for an RD....anyway ARE those enignes ..T500 titan engines cos the look very similar
they sure are T500s I think there was not a great deal of difference between the T500 Titan and the TR500 road racer basic motor ... Same goes for the GT750 and the TR750s I think.
HOw about this jim
http://www.youtube.com/watch?v=2NuIG...eature=channel
I am only going off previous experience. I had an RZ500 that was an absolute pig to get off the line without copious amounts of clutch drag...quote:Originally posted by Tony OW31
That is a bit of a myth, most two strokes of equal capacity will have more torque at lower rpm than four strokes. I think it is because people are used to comparing them on a performance basis, and for equal performance a four stroke is usually twice the capacity.
Also, if that is the case Tony, why are two strokes not used more?
i guess when u tune em theyre fragile ....
The RD/RZ 500 had a very high first gear ratio, that's why it was hard to get off the line, but if you compared it to anything of the same capacity in that era, it would be gone (apart from the RG500).quote:Originally posted by Cruisecontrol
I am only going off previous experience. I had an RZ500 that was an absolute pig to get off the line without copious amounts of clutch drag...quote:Originally posted by Tony OW31
That is a bit of a myth, most two strokes of equal capacity will have more torque at lower rpm than four strokes. I think it is because people are used to comparing them on a performance basis, and for equal performance a four stroke is usually twice the capacity.
Also, if that is the case Tony, why are two strokes not used more?
They don't use two strokes anymore because they cannot meet the emission regulations, although some of the high pressure direct injection marine outboards do.
Yamaha is the only manufacturer to make equivalent two and four strokes now
YZ250 specs
Engine Type: Single cylinder 2-stroke
Engine Displacement: 249cc
Bore & Stroke: 66.4 x 72mm
Compression Ratio: 10.9:1
Max HP: 41.3 HP @ 8400 rpm
Max Torque: 28 lb-ft. @ 7600 rpm
YZ250F specs
2009 Yamaha YZ250F Specs
2009 Yamaha YZ250F
Engine Displacement: 250cc
Max Horsepower: 33.3 HP @ 11,900 rpm
Max Torque: 17.4 lb-ft. @ 8600 rpm
Cheers for the reply.
My only query there is would those figures be taken at the crank or the rear wheel?
They where from the motorcycle usa mx shootout, they test all the bikes on the dyno on the same day.quote:Originally posted by Cruisecontrol
My only query there is would those figures be taken at the crank or the rear wheel?
Jockney, I THINK but dont quote me, that to run Nostalgia your bike has to either be an American Twin or Pre 1980 Jap. That was the case a couple of years ago when I looked into it anyway. My old man races his ute at nostalgia meets so I'll ask him and let ya know.
Jockney, you can email this lady for info about Nostalgias.
chris.sims9@bigpond.com
I know a year or 2 ago Smurf was interested in running in the Nostalgias but they wernt running bikes, im pretty sure its still the same. Its a real shame if they dont let the older bikes in.
They ran bikes at the last one but apparently it was invitation only.[}]
I must have upset someone with the email i sent them ( hard to believe i know) but i never got an invite.
Different people running it now too so fucked if i know what's going on now & i don't have the old girl any more so no matter to me anyway.
thanks for all the info guys im definately interested ..in running some sort of 2 stroke ..whether it be a hybrid or a n old stoker ..just for fun ..
Mick Hansen up here in Mackay has a CR500 that i've seen run 10.0 a few times, it may have gone into the 9's. Ronnie Stayte has an old race bike that he was selling last time i saw him at the track, if your interested in buying something that needs rebuilding, i'll grab some photos for ya
hey i reckon thats scotty macs bosse's cr500 your talking about mate i am pretty sure he still live's in mackay
Glenn Eason drinks and smokes and lends his arse to other blokes
[youtube]http://au.youtube.com/watch?v=5qROwMqCLAw&feature=related[/youtube]
cop this little gem
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