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  1. CB175 K6 "Abarth" build - Idles at red line

    Engine Discussion
    So I originally posted on the start of this build a few months back and it's damn near completion. Before I started the build I wanted to make sure the bike would run so I did a carb clean, short circuited the coils, gas in the tank and after some bowl adjustments It started up but it was...
  2. Mikuni VM32 settings on CB450 K-something

    Fuel Supply and Carburation
    As part of a very long process in nailing down what was wrong with the way my 450 idled I threw a bunch of money at a set of Mikuni VM32 carbs. Bought one of them kits from Power Barn which claims to be set up for the 450 and winced mightily at not only the sticker price, but the import duty I...
  3. strange idle mix issue

    Fuel Supply and Carburation
    1971 cb350 (stock) Hello all. I am having an odd issue with one of my carbs, using this video as a reference. A motorcycle nut: cb350 carb tuning I set the mix 1 turn out, then warm up the bike (it does this if its warm or not). When I adjust the mixture screw, the idle decreases steadily as I...
  4. 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...
  5. Mikuni VM30 Carb Leak

    Mechanical Issues
    Hello hondatwins community, The set of mikuni VM30s I have on my cb350 have been troublesome since I've owned this bike. Most recently, I've noticed a fuel leak from the fuel line attached to the float bowl at the bottom of the right side carb. It's causing the bike to have difficulty starting...
  6. I think I have the wrong #14 (Needle air jet). Where to locate?

    Parts Guide
    Guys been working on this Abarth Cafe. I have it running and nearly complete but after redoing my carbs with a complete carb kit off ebay it did not come with a #3 or #14. Where do I get these? I cannot find them anywhere?! Will have photos of bike soon! -Zack MOTOZCDC
  7. Outlet tube from carbs?

    Parts Guide
    Super newb to motorcycles and engines in general. Right carb has an outlet tube on the bottom that just empties to below the bike. Left carb has a nozzle in same place but no tube.. model is CB450 K7. what are these for and should the left carb have a tube here too? Seen aLot of diagrams and...
  8. 1985 CB450SC needle length?

    Fuel Supply and Carburation
    I have been working on my buddies 1985 CB450SC, the previous owner tried to rebuild the carb and put A bunch of incorrect parts. I have already replaced the pilot and primary jet with the correct size. The only part I am unsure of/think might be incorrect is the Vacuum piston needle. It is...
  9. Leaking Carb on CB350

    Fuel Supply and Carburation
    It looks like i have some bad leaking with my carbs on my cb350. I am very new to mechanics and bikes in general. Can anyone provide some help to how i can go about fixing this on my own. Half the reason I got the bike was to have something to learn mechanics on. Below is a video of whats...
  10. Cm400t carb replacement

    Fuel Supply and Carburation
    I didn't do a keyword search but figured you guys might be able to help me on the best aftermarket or simply replacement carbs purchasable. What's a good site or seller that would ship to me? I have about 250-300$ to work with and am looking to install it asap. TIA
  11. Please help carb adjustments. Runs rich

    Fuel Supply and Carburation
    So my buddy bought a 81 cm400 custom for cheap, didn’t run. We figured it was carb. So we cleaned the carb and did a rebuild. Starts up fine but revs kinda crappy. First time for both of us rebuilding a carb. When you ride the bike it seems to not have much get up and go with any sort of load on...
  12. CB500T with VM32 Mikuni Carbs - Coughing/Spitting at 4000 rpms

    Fuel Supply and Carburation
    Hey Guys, I've got a 1976 CB500T that I've been resto-modding. The bike has gone through a rebuild some time ago, and I'm finalizing the build by trying to dial in carbs. I've ridden the bike around town multiple times, the most recent ride started out great, then after a few miles I started...
  13. 1972 Honda CL 175 K6 with Various Carb Issues

    Fuel Supply and Carburation
    Hey guys, wondering if anyone has any ideas on some issues I've been running into on my 1972 Honda CL 175 K6. So I've pretty much done a full rebuild on this thing(all original parts except for the air boxes) and there's been a few problems that I've been running into with the carbs. 1. Every...
  14. Aftermarket exhaust causes backfire

    Engine Discussion
    Theory only on cm400t.... I'm running aftermarket baffled exhaust pipes, dual.... I'm running pods and jetting carbs 125 and 90. The bike runs good for age, with a little hiccup in top-end 2nd and 3rd gear, but cruises well in 4th and takes the juice without a problem. The hiccups are minor and...
  15. Belgian guy, Honda CB125 K5 1971 German

    Member Introductions
    Hi! I'm a Belgian guy with a 1971 Honda CB125 K5 originally from Germany. The bike has those distinct German indicator lights. I bought it looking like brand new but the bike was a mechanical mess. I had the head bored to .75 oversize with new pistons and piston rings. Also the valves got...
  16. 1982 CB250N Superdream Jet sizes???

    Fuel Supply and Carburation
    Hey guys, My superdream is having problems and seems to be running rich. Always has sooty black plugs and i'm wondering if the jet sizes are wrong, but I can't seem to find any information on what stock jet sizes are. I've looked in the OWM and online but no luck. Thanks for helping Cheers Isaac
  17. CB175 Idling Inconsistent

    Engine Discussion
    what's up. so i have a 1971 CB175 that I bought a while ago and got running. (i'll list what i did below). but now it's either (1) idling way too high (4-5k) and fuel adjustment screw doesn't respond, or (2) idling too low and shutting off (will stay running if throttle used), or (3) most...
  18. Can I remove CB500T breather box?

    Fuel Supply and Carburation
    Hi, I have a '75 Honda CB500T. I removed the side air filters and am putting on pods (it has been jetted accordingly). I want to know if I can remove the breather box. If I do, what do I do with the small tubes that leave the carb and enter the box? Thanks!
  19. Basic carb tuning 1982 cm450E

    Fuel Supply and Carburation
    Just curious if anyone had a decent step-by-step or how-to on tuning carbs on a 1982 cm450E. I think I would benefit greatly from a more seasoned mechanic's wisdom the subject. I have the Shop manual that someone posted while back which has a decent rundown of this, but I think a veteran 450...
  20. 1975 CB200T Carburetor Disassembly Help

    Fuel Supply and Carburation
    Hi everyone, I tried to search around this forum a little but couldn't quite find what I was looking for. I'm not new to wrenching but I am new to motorcycles and I bought this CB200 about a month ago with a few issues. I'm starting to go through the fuel system. I'm in the middle of...
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