cb400a

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Hello VHT, I am once again asking for your technical help. The center stand on my 1978 CB400A is missing something to hold it up off of the ground while it's stowed. From the part fiche, it looks like its missing the below spring and "C" piece the spring attaches to. Unfortunately, the fiche...

To preface, I'm not the brightest crayon in the lunchbox sometimes so forgive me if I'm missing something obvious. I have a 1978 CB400A that needs a new brake rotor, and the only results I can find are a couple used listings on eBay (used rotors seem like a weird proposition to me) and a couple...

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 found a listing of a 1978 CB400A Hawk Hondamatic for $1,000. This would be my first motorcycle and I wouldn't mind having to fix and tinker with it since it won't be my primary vehicle and I like to tinker and fix stuff anyway. The biggest reason I'm entertaining the idea of this bike is not...

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...

I am hoping someone can point me in the correct direction. Garage kept 78 CB400A and I run w/o a battery, which the cause of this is probably why I do. Today I run w/o the battery and last fall I noticed my turn signals would only work when stopped and in gear, or throttle<25%. Headlight &...

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...

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...

Hello to all VHT Members, I've setup a community test kit for diagnosing ignition/no-spark/bad performance conditions. Swapping your parts with the ones out of the kit can help you diagnose if you need a stator, CDI, or coil. The kit includes: Prototype CDI Known-good Ignition Coil with new...

This is one of our most popular headlights, that you are sure to love! This is a perfect headlight for a variety of bikes, from stockers, caferacers, off road dual sports, and everything in between! This comes with a 7" LED headlight with billet mounting brackets. This headlight is very bright...

Original document by Jim O’Brien. Updated by Frank Sapone. If all these tests are good then the CDI is at fault. Before replacing a CDI all these components have to test good. Use a Multi-Meter, VOM or Volt-Ohm-Meter, with a new battery and set it to measure electrical resistance in Ohms...

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...

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...