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Author Topic: cylinder fins cleaning  (Read 625 times)

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Offline crashmaster

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cylinder fins cleaning
« on: November 08, 2025, 07:46:05 PM »
I want to clean the cylinder fins on the bike while the motor is in the bike. Besides the obvious spark plug, intake, and exhaust holes - are there any other places or holes on that part of the motor where cleaner could get into the motor? Or can I spray freely into the fins to clean. Can't really see where some of the passages go. Thanks
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Offline newday777

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Re: cylinder fins cleaning
« Reply #1 on: November 09, 2025, 02:42:27 AM »
As long as the motor is all together there are no other places to worry about than those 3 places.
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 1 K2, 4 K6, 1 K8, 1 F1, 1 F3
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline crashmaster

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Re: cylinder fins cleaning
« Reply #2 on: November 09, 2025, 06:36:00 AM »
Thanks Stu
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Online MauiK3

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Re: cylinder fins cleaning
« Reply #3 on: November 09, 2025, 07:39:05 AM »
What type of cleaner will you be using?
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Online Deltarider

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Re: cylinder fins cleaning
« Reply #4 on: November 09, 2025, 08:26:56 AM »
I wonder... is there anything against brake cleaner?
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Offline Kelly E

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Re: cylinder fins cleaning
« Reply #5 on: November 09, 2025, 08:48:23 AM »
I use solvent and rinse with non chlorinated brake cleaner.
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1975 Honda CB 400F Super Sport                          1972 MGB/GT
1977 Kawasaki KZ 1000 LTD                                   1985 GMC S15
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1980 Suzuki GS 1100E
1983 Honda CB 1100F
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Offline HondaMan

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Re: cylinder fins cleaning
« Reply #6 on: November 09, 2025, 07:57:30 PM »
Quote from: Deltarider on November 09, 2025, 08:26:56 AM
I wonder... is there anything against brake cleaner?

I once used it on a CB125 Honda single (leaking gasket at the top), and it took the paint off the crankcases. I don't think it was Honda's paint, though, as the engine had been previously rebuilt by someone else.

...then it also got repainted...
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Offline seanbarney41

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Re: cylinder fins cleaning
« Reply #7 on: November 10, 2025, 09:29:41 AM »
Couple things I use...wd40...really soak it and then hose it off.  Also, S100 all over bike cleaner is amazing, but expensive.  Gunk brand engine degreaser really works great but can darken  bare aluminum color.
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Offline crashmaster

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Re: cylinder fins cleaning
« Reply #8 on: November 10, 2025, 11:59:23 AM »
Cool. Thanks everyone
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Offline Tim2005

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Re: cylinder fins cleaning
« Reply #9 on: November 10, 2025, 12:08:23 PM »
How about using one of the brushes from this post too  http://forums.sohc4.net/index.php/topic,194611.msg2277916.html#msg2277916
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Offline crashmaster

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Re: cylinder fins cleaning
« Reply #10 on: November 10, 2025, 02:34:15 PM »
Tim, that is a good idea! Thanks!
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