carb

78’ cb400t with a 81’ cm400 motor and vb21 non accelerator pump carbs It’s hard to start and I can’t use throttle unless choke is set to 2k rpm otherwise it bogs down it was working fine until I had it pulled in at work fixing some headlight wiring and noticed fuel isn’t going into the carb. It...

A few years ago I bought a blue 1978 CB250N Superdream, almost identical to a later one I had as a teenager. I'm still impressed by what a beautifully engineered, solid bike the 250N is, and my example is in good cosmetic condition and the 14k indicated mileage seems believable. However...

Hello all, As the description states, my throttle butterfly valve is stuck shut. This is a project bike that I recently purchased and has likely not been started since the early 90s. Upon initial inspection I noticed that I could not turn the throttle by hand. I've found that the root cause is...

Hey all, I've been having a carb leak on just one side from the center overflow valve. I've rebuilt it but it still leaks a ton any time there's gas in the line. Any ideas on what could fix it ?

I am not sure this issue is carb or electrical related, but after rebuilding the carbs many times and them running fine up until recently, I feel like my issue is most likely more electrical. So, with that in mind, let me jump into it. My 1980 CM400 started running rough about 300ish miles...

Hi, I've purchased 3 (VBd, VBa, VBa) carbs for my 1980 CM400T (Canada), got the first two working fine until carb 1's cast throttle hook snapped and carb 2's float needle holder snapped. 1st one I was driving when it happened and I just can't figure out a way to safely reconnect it, and 2nd was...

Hello! A couple questions… Any idea what could cause the “scuff marks” on my carb piston and/or should I be concerned? Also, does the fuel pump diaphragm‘s rubber boot go under the carb body or does it fit within the opening, flush with the top surface? Please and thank you! (Photos below)

Hey everyone! I have an 82 Nighthawk that I’m going to be getting in shape to ride next spring. The bike has many issues but the first one I’m tackling is fuel. I have went through and cleaned both Carbs. I also replaced both air cutoff valves as well as the accelerator pump and all gaskets and...

I am very new to the forum. I need a lot of help. I am in the process of rebuilding the carbs and I made a huge mistake. I broke the slot on top of a part and had to beat a small flathead into the orifice to get it out. I believe it is the needle jet holder but I could be and probably am wrong...

I have been working on my 1982 CM250C trying to make it,,, well run right. This is my first bike and this process has been enlightening and fulfilling, but also confusing and frustrating so much that I have named the bike Enigma. Enigma because every time I work on the bike expecting the outcome...

My Honda runs great at idle but as soon as you give it throttle, it dies. Carbs have a full rebuild, points are set, valves are set, new plugs, new coils, and a bunch of other new stuff. Needless to stay it is pretty much completely rebuilt and I have no idea how to get it to run with throttle...

Hey all, bike n00b here. I have a 72 CB175 that I'm finally getting around to fixing. A brief history, the bike has ~3k miles. I bought it from the PO in 2019, who said it was in storage since the 80's. It started and ran when I bought it, and my dad rode it October 2020. Now I can't get it to...

1979 CM400T carb rebuild- read stickies, looking for dummy version for some things. I've got the carbs torn down on the table and im going through stickies and how tos and just get confused on some longer threads. So here's the issues. Putting new stock jets in- how many turns? Main and...

Ok, so I started trying to adjust the carbs today and I'm not having a lot of luck. I read the shop manual and some threads on here and am pretty sure I understand how the adjustment screws are supposed to work. I was trying to get the bike to idle at 1200 rpm cold but not having a lot of...