Can't think of any. Which is why I called it an evolutionary deadend. Pity cos it always seemd a good idea to me. Rotary inlet and "powervalve" exhaust - now there's a thought.
Forum whore
Can't think of any. Which is why I called it an evolutionary deadend. Pity cos it always seemd a good idea to me. Rotary inlet and "powervalve" exhaust - now there's a thought.
Originally Posted by skidmark
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That looks like Posh Tourers old bike (literally) It had a power band (just) was slow, and was very tempremental...
See Robert Taylor for any Ohlins requirements www.northwest.co.nzThanks Colemans SuzukiThanks AMCCI use DID Chains and Akrapovic Exhausts
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I always liked the idea too - being able to make assemtrical opening and closings.I've never had a rotary valve 2 stroke....but used to look after a fleet of GP100's.....I was always tempted to just,y'know....trim one a little bit eh?
But reed valves have taken over - they owe it all to the Iron Horse...
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There's a dark green one up our way. Pass it on the way to work quite often. (yes, it's in the traffic, not on the roadside).
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Didn't Kawasaki do that with one of their engines? I have two KH100's sitting under my bench... Maybe I could do something with one. Hmmm.
.
Ixion, my bike's got powerjets. Bet you dont know what they do do ya?
The metal is always nude.
I used to race a GP100 bucket. By cutting away the rotary valve a little to adjust the inlet timing you could quite a good power increase.
But like what has been said here, you get a 28mm carb on plus a pod and she get's a little too wide.
"...you meet the weirdest people riding a Guzzi !!..."
No8 Wire Extraordinaire
Why certainly sir.
In the mid 90s when everyone knew that reed valves were the only modern way forward Aprillia (& later Derbi as well I think) started making their GP bikes rotary valves & largely dominated the 250 & 125 classes for over a decade. Rotax had disc valve GP engines, but they were 1980, but did struggle on to almost 90.
Sadly no spin off into the street because blah blah blah tree huggers blah blah etc. Aprilia used the RGV engine in its RS250, pity, but probably a sound economic decision.
Don't you look at my accountant.
He's the only one I've got.
The metal is always nude.
Weren't Bridgestone squeezed out of bike manufacturing by the "Big Four" in a blackmail politics, ie we won't buy your tyres if you keep making bikes.
I'm sure I read that somewhere.
"...you meet the weirdest people riding a Guzzi !!..."
No8 Wire Extraordinaire
......................
Don't you look at my accountant.
He's the only one I've got.
Forum whore
Suzuki and Kawasaki made disc valve bikes,but I can't remember any from Yamaha....did they make any? But Yamaha were the first to put reed valves into production bikes.I bought a CT2,the 175 trail bike in 1972,the first year of the reed valves - it had a shit load more power than the TS185 which was it's competitor.Pity the Yamaha handled so bad,my brother had the Suzuki and I much prefered to ride that as it handled sweet.
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No8 Wire Extraordinaire
Yes they did, again all GP bikes. the last of the parallel fours were all piston port to get more power than the reed valves of the day. Then they went square four discvalve like Suzuki, this was Roberts & Crosbys stable fare circa 1981.
Don't you look at my accountant.
He's the only one I've got.
The metal is always nude.
Yeah, but I was being a little more precise.....
My 1963 YG-1 has a disc (rotary) valve and it has a good spread of power for the little cc it has.
"...you meet the weirdest people riding a Guzzi !!..."
In the riders seat
Madkeenandy will be racing one of those MZ 250 thingys in the BEARs "Sound of Thunder" meeting this weekend
If I had the money I'd have one of them
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough power."
No8 Wire Extraordinaire
Ok here goes,
on 14th December 1971 at a 4 o’clock press briefing Bridgestone announced that they were ceasing production of motorcycles to favour their tyre business. Soichiro Honda was clearly seen to have is right hand inserted up the shirt of Mr Nagawichi, Bridgestones spokesperson, and seemed to be performing a ventriloquist act. Later he drank a glass of water whilst Mr Nagawichi sang ‘Come on Eileen’ to rapturous applause, exceptionally impressive as it would be a full 10 years before Dexys Midnight Runners would release the song, but Bridgestone were considered ahead of their time.
What? Its true. .
Don't you look at my accountant.
He's the only one I've got.
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