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Author Topic: IMD High compression pistons  (Read 795 times)

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Offline Nob88y

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IMD High compression pistons
« on: January 31, 2019, 04:03:05 AM »
IMD pistons for the CB750 are sold on Ebay for a reasonable price and sold in UK.  I am toying with idea to buy the +.5 oversize ones. Their advert says suitable for K1-K8 and standard compression for an F2. My bike is a 78 K8 import from US. The standard piston head ad a small dome and the IMD have a larger dome. The chaps who sell them reckon no other mods are needed to heads to heads or cam.  Has anyone got experience of fitting these or comments to make.
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Offline TysMac

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Re: IMD High compression pistons
« Reply #1 on: November 18, 2019, 02:55:35 PM »
I'm running into the same problem.  I'm trying to use the same pistons on my K7.  I hope somebody has some answers.
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Offline Tracksnblades1

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Re: IMD High compression pistons
« Reply #2 on: November 18, 2019, 08:50:44 PM »
This was borrowed from Kenny.....

Originally for F2 vs K valve keepers, but it'll show you why F2 pistons may contact your K head.
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Offline Don R

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Re: IMD High compression pistons
« Reply #3 on: November 18, 2019, 09:10:26 PM »
 I would clay the combustion chamber before running either way. If it says they fit I'd try them. Your 78K should have the 392 head, same as the 75f0 and 76f1.
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Offline BPellerine

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Re: IMD High compression pistons
« Reply #4 on: November 19, 2019, 08:20:29 AM »
they might be 410 pistons he is talking about.bill
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Offline Don R

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Re: IMD High compression pistons
« Reply #5 on: November 19, 2019, 08:33:45 AM »
 Correct.
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No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.
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