« Reply #2 on: October 14, 2024, 03:07:19 AM »
Any recommendations for aftermarket piston kits for a ‘75 CB400F pistons? I have seen some from Cruz in Images, 4 into 1 and some on eBay. My stock honda piston are oval. Cylinder are true.
Did you use a machinist quality bore mic to measure the bore of the cylinders to be sure they are not tapered, as they usually wear in to be? Always best to do a fresh bore up size by +.25 at minimum(1st oversize set). You say you have oval pistons, so get bigger pistons and rings sets with fresh bores to tight tolerance clearance that these baby Fours require. Hondaman says they need to be .0004"-.0008" piston clearance, not bigger piston clearance so you don't have burning oil from too big of piston clearance.
Cruzin Image comes highly recommended as quality piston sets.
4into1.com doesn't come highly recommended. Cheap Chinese parts are not good quality items.
Read through this project rebuild
http://forums.sohc4.net/index.php?topic=179579.75
« Last Edit: October 14, 2024, 03:12:10 AM by newday777 »
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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, 2 K4, 2 K6, 1 K8
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
