hondamatic

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Hello, VHT! I recently inherited my great grandfather's 1978 CB400A (the Hondamatic one) which has sat idle for over 20 years. I'm a total greenhorn when it comes to motorcycles, but I've always been fascinated by them and now seems like as good a time as any to learn what they're all about. I...

I recently picked up this 1981 CM400A from marketplace. It runs, but needs some work. I've built and restored all sorts of things, but this is my first vintage motorcycle, so it's a bit of a learning experience. (Pictures are of it pre-restoration.) I've already done some things, still lots to...

Looking for crash bar for 1978 cb400a in good condition or aftermarket. Any help with links would be greatly appreciated. I've looked around but mostly have found overpriced rust and no aftermarket. Thanks.

Per this build thread: https://www.vintagehondatwins.com/forums/threads/1978-cb400a-hondamatic-from-west-chester-pa.13106/ we need a fuel tank in usable condition for a CB400T/CB400A. Ideally a red tank, but open to anything. Thanks in advance!

I made a small video showing how a properly tuned Hondamatic should respond. When you do this check you really ought to use a portable tach. However, it can be done ear. If you can't achieve a good idle there are a number of things it could be such as: Dirty idle jets Shrunken or missing...

Hello! Recently I bought a clean cb400a for cheap because it had no spark. I found the CDI and Stator were bad. Finding a CDI was easy, the hard part now is finding a stator that isn't outrageously expensive. Does anyone know of a stator for sale or if there is another stator I can substitute...

Now that supply is dwindling for the original cam chain I see DSS and eBay vendors list an aftermarket cam chain for the 400/450 twins. Digging in further it's actually a timing chain made by Borg Warner and says it's "Morse" for high strength/reliability. They appear to be a vendor for the...

We have an on-going thread here with a forum member trying to locate those critical torque converter cover gaskets. Right now there is one with the insane price of $150. With that said, I did some research and found who manufacturers the gasket kit for 4-into-1. I've reached out to them about...

I have to replace the 16005 bearing in my CM400A outer torque converter case. I could find a large pipe that fits the outer diameter, a bearing driver set, or a socket of the right size that also fits the outer diamater. However, I don't have this size laying around and an old trick if you...

⚠⚠NOTE TO THOSE WHO USE THIS AS A GUIDE. WHEN I REFER TO BOLT SIZES I AM REFERRING TO THE SIZE OF THE HEAD⚠⚠ I'm not 100% ready for this yet, but figured I will start some documenting here. I have 34,700 miles on my 79 CM400A. I originally had about 12,000 on it when I first got it back in...

I've been using GN4 for years, but figured at $15 for a gallon on Amazon for Shell Rotella T4 15W40 why not give it a try? I know others here have used it with much success on the 400Ts. I'm pleased to report works just fine; as expected. No issues with torque converter slipping or trouble...

FOUND I'm looking for a change switch for my 1979 CM400A. The same switch was used on the CB and CM across the 400 and 450. From what I can tell this is a notoriously hard part to find but should be on any of those engines, if you're doing a tear down please consider pulling it off, it is the...

Hello, I've been working on reverse engineering the Hondamatic CDI for the CB400A, CM400A, CM450A bikes. It's now been successfully road tested for more than 3000+ miles in stop and go traffic, and highway. Over 20 sold. Here is a video of the prototype running on my 79 CM400A: CURRENT...

My kickstart shaft broke, so I bought a new one, but I'm having trouble getting everything to fit properly, so the kickstart just feels very spongey when I try to kick it. I can't find the punchmark on the new shaft, which is part of the issue, but then even if i do get everything to fit, I...

Tomorrow is my 79 th year on this old earth. I am starting to fell every one of them so I closed the shop . I will finish the CA 95 but its my last one. Its been a good run but its time to slow down. For those who Have A models I thought I would leave a few notes. All the A models , the 400...

Several years ago, in a set of strangely difficult to quickly explain circumstances, I acquired a history-unknown 1979 CB400A Hondamatic. After some fussing, including new tyres, an oil & filter change, a carb strip & clean, a fresh battery and other TLC I'm pleased to say it ran. I didn't ride...