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  1. Fuel Question: 1982 CM450c Running only one cylinder

    Fuel Supply and Carburation
    I just bought a 1982 CM450c one month ago. It was a barn find, only 5400 miles. The seller supposedly “cleaned” the carbs and used a rebuild kit. He got it running, though said carbs needed adjusting. I’ve got it starting easily now, but requires 2-3 min of choke and slight throttle. It then...
  2. 1982 CB450T Cylinder Removal

    Engine Discussion
    Hello, I've been having trouble removing the cylinder. I've done as the manual says and have removed what needs to be removed. The cylinder moves freely by about 4mm until it stops. It feels as though as though it's coming into contact with another piece of metal, but looking at diagrams and...
  3. Wanted: CB350 CL350 Head - 1970-1973

    Wanted Parts and Bikes
    I'm rebuilding mine and need a new one. Valve seat has come loose on mine and want to replace. Please DM with asking price!
  4. 1974 CB 450 crapped out in 15 minutes

    Engine Discussion
    My son has shown some interest in the older Hondas so we found one about an hour away. Checked it out, no smoking, no leaking, idled good, oil looked good and it felt good on the test ride. We bought it and insured and registered it. Got on it to take it to a closed parking lot for him to...
  5. CB450 Cylinder Jugs Needed

    Wanted Parts and Bikes
    Hi all! This is my first post here in the Hondatwins community, so bear with me... I am looking for a new set of cylinder jugs for my 1972 CB450 rebuild. I took them to a local vintage motorcycle rebuild business here in Ferndale, Michigan. There was some cylinder wall damage on the left...
  6. cylinder piston rings

    Engine Discussion
    Hi, I've been working on my 78 CB400T2 and recently had the valves re-seated and cylinders honed. I got the pistons all cleaned up and as I was putting the new piston rings on, one of them broke. It was the middle ring. For now, I used the old piston ring as a substitute, as it was still...
  7. Top End Questions: Seeking Advice on Next Steps

    Engine Discussion
    I'm a new member and have started a few cb projects. Currently, I have (2) cb350, and (1) cb100 engine torn down. One of the 350's is a K0, the other is a K4. I'm at the point of all of these where I need to make a decision what needs to take place with the pistons, rings, and cylinder walls...
  8. 1974 Honda CB450 K7 - Leaking Front Master Cylinder

    Tires, Wheels, and Brakes
    Hello everyone! It has been awhile since the last time I posted, but I have hit a brick wall with a brake issue so I figured I would ask the experts. I recently rebuilt my front master cylinder (everything labeled 25): However, brake fluid is still leaking from the piston/brake lever and when...
  9. want cb450 cylinder walls, intake cam

    Wanted Parts and Bikes
    I'm looking for cylinder walls/jugs for a CB450 in decent condition. I will be over-boring them to 71.5 mm, so if they aren't perfect on the inside, its fine. I do want all the fins intact and the exterior in decent condition. I'm also looking for an intake cam if anyone has one sitting...
  10. Stuck cylinder

    Engine Discussion
    I'm in the process of doing a complete rebuild on a 1968 Honda CL175 and the cylinder is putting up a pretty good fight. I've removed the only screw I can see that holds it in place and managed to fit a strap in between the openings (see photo) to try to lift the block off, but no luck. The...
  11. One cylinder sputtering

    Engine Discussion
    I recently got a '78 CB400 and it's been running a little jenky since day one. I've cleaned the carbs, did a quick oil change and slapped some new shorty's on there (I figured the back-pressure loss might be to blame as it was straight pipes when I got it) but it sounds as if the left cylinder...
  12. 1971 CL175 Losing Power

    Engine Discussion
    I have a 1971 Honda CL175 that I have been working on the past couple months. I've gotten to a point where I'm stumped and I need help. After the bike warms up on a ride it seems to drop to one cylinder or lose power. I can stop for a little while and start again and its fine. This led to...