When looking for cylinders how can you tell the difference between say the 74 and later 75-77 cylinders.
My later 77 GT 750 cylinder has seen better days and maybe cheaper to buy another than repair.
Ian
74-77 GT 750 cylinders..how to tell
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T350guy
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jeff kushner
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Re: 74-77 GT 750 cylinders..how to tell
Offtopic but are you the same "Ian" that is building the H1 turbo that I've been talking to off and on over the past year?
jeff
jeff
Present: VStrom 1000 K7, Stock: '74 RD350,’75 GT550,'76 CB400F, '75 H2(purple), Modded: ‘75 GT550 restored & ported, '82 Yamaha 650Turbo running 18PSI,'74 H2B carbs-pipes-ported, project list:'72 & 2-'75 H1's, '82 Yamaha XV920, 74 GT750
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tz375
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Re: 74-77 GT 750 cylinders..how to tell
Fortunately that's really easy if you have the barrels in front of you.
Externally there is no significant differences between an L and M-A-B cylinders.
The ports are very different though. L has the same ports as a J or K. Exhaust roof 42.5mm down and inlet floor 101mm down.
M-A-B have exhaust roof 40mm down and inlet floor 106mm down.
Best street barrel IMHO is a J-K-L and best performance barrel is the later one. The issue is intake height on later motors hurts low to midrange performance. So for a mild street bike get an L block and raise the exhaust port slightly for the best of both worlds.
Externally there is no significant differences between an L and M-A-B cylinders.
The ports are very different though. L has the same ports as a J or K. Exhaust roof 42.5mm down and inlet floor 101mm down.
M-A-B have exhaust roof 40mm down and inlet floor 106mm down.
Best street barrel IMHO is a J-K-L and best performance barrel is the later one. The issue is intake height on later motors hurts low to midrange performance. So for a mild street bike get an L block and raise the exhaust port slightly for the best of both worlds.
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T350guy
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- Location: Tweed. Ontario. Canada
Re: 74-77 GT 750 cylinders..how to tell
Sorry not me Jeff But I do have a H1...H1B that isjeff kushner wrote:Offtopic but are you the same "Ian" that is building the H1 turbo that I've been talking to off and on over the past year?
jeff
Thanks for the info on the cylinders.
I'll keep that in mind when I'm looking .
Ian
