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Author Topic: Honda CB350F/400F/550 Ignition Points and Timing Plate Allen Bolt Sizes?  (Read 857 times)

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Offline Bristledisk

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Honda CB350F/400F/550 Ignition Points and Timing Plate Allen Bolt Sizes?
« on: September 22, 2025, 11:46:01 AM »
Hi All,

Does anybody know the sizes of the screws for the timing plates. I don't see them all listed in the parts diagrams.

I believe the 3 large bolts will be M5x14 but I don't know the smaller 6 adjustment bolts. See image.

Thanks in advance.
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Offline Deltarider

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Re: Honda CB350F/400F/550 Ignition Points and Timing Plate Allen Bolt Sizes?
« Reply #1 on: September 23, 2025, 02:50:00 AM »
I have had allen bolts there, but I didn't like it. Using a good JIS screwdriver offers much more feel; less risk of overtorqueing.
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Offline newday777

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Re: Honda CB350F/400F/550 Ignition Points and Timing Plate Allen Bolt Sizes?
« Reply #2 on: September 23, 2025, 05:16:48 AM »
The smaller screws are M4 but I don't recall the length
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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 bryanj

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Re: Honda CB350F/400F/550 Ignition Points and Timing Plate Allen Bolt Sizes?
« Reply #3 on: September 23, 2025, 08:04:21 AM »
Dont forget plain and spring washers
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Offline Deltarider

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Re: Honda CB350F/400F/550 Ignition Points and Timing Plate Allen Bolt Sizes?
« Reply #4 on: September 23, 2025, 08:19:17 AM »
Quote from: bryanj on September 23, 2025, 08:04:21 AM
Dont forget plain and spring washers
Yep and be aware most pics do not show all washers. Here's a good one.
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Offline bryanj

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Re: Honda CB350F/400F/550 Ignition Points and Timing Plate Allen Bolt Sizes?
« Reply #5 on: September 24, 2025, 01:23:33 AM »
Plus you have to be careful with allen bolts as it is easy to overtighten and strip the threads in the plate
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!
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