'76 CB360t Cafe - Mikuni Carbs/will it ever run right?

A

austo52000

New Member
Hey Everyone, I've been lurking on the forums for a while now (I've had the bike for around 3 years). First time actually posting on here though.

I picked up the bike about half finished, the guy couldn't get it to run right and gave me some parts. I cleaned out the carbs and put a new rectifier on and she rode! Replaced some fuses and other small components here and there as well.

The thing that has bugged me for 3 years (having not ridden it a whole lot) is that he gave it to me with no carb filters and everything I have found is way too small, I've spent almost $100 trying different pod filters on them to no avail.

I know that they're Mikuni tube slide style, I'm assuming the VM28, 30, or 32, but I can't figure out which style they are or get the bike to run well on them, she pops and backfires pretty constantly unless I'm really on the throttle. I do still need to sync the carbs, but no amount of air/fuel adjustment or needle/slide placement has yielded any sort of desirable result at idle/low rpm riding and cruising.

Don't get me wrong, I like riding it hard, but it would be nice to be able to cruise the speed limit without having a constant stutter.

I figured someone on here might be able to throw down some Honda wisdom! Also, I definitely need to measure the carbs and find out what they are, but I don't know what measurements Mikuni is looking at when they define the 28, 30, etc.

I'd love to get the bike in great shape for the rest of this riding season!

Thanks guys!
 
Bike will run best with VM30. You can find the model like this - look to the front (engine side), left upperside, there is a small number. This tells you which carb you got. There must be a 30-83. This says you got a VM30. To check if you got the right components, you need to tell what´s in it: pilotjet, mainjet, needle jet, jet needle (clip position?), slide, airjet. I have done some CBs, maybe i can help.
 
Or remove the carbs and measure the outlet bore (that's the engine side).

What jets and needles are in there at the moment and what are the symptoms - just a rough spot at part throttle? or other issues as well? Most carbs come with stock Sudco jetting and it is rarely correct for any specific application and needs to be changed.
 
Jan84 said:
Bike will run best with VM30. You can find the model like this - look to the front (engine side), left upperside, there is a small number. This tells you which carb you got. There must be a 30-83. This says you got a VM30. To check if you got the right components, you need to tell what´s in it: pilotjet, mainjet, needle jet, jet needle (clip position?), slide, airjet. I have done some CBs, maybe i can help.
Click to expand...

without knowing what other modifications if any have been made it's a pretty bold statement - also you're wrong.
 
Of the three CB360s I have built, the VM28 is the best fit. That said, you can get them close up to VM32. The last one I built, I bored to 378 and ran 28s. Here was my setup:

Slides 2.5 cutout
5F21 needle
O-8 Primary needle jet
130 main jet
30 slow jet

Ultimately, I swapped out the VM28s to put on another build and swapped in the stock CV carbs with CrazyPJs mods.

Check your brass and see where you are. My VM28 setup may not be exactly right for you, but it should be in the ballpark.
 
Timing these with a light is a pain in the ass because the marks are on the rotor and bathed in oil. You can get them just fine with static timing.
 
You must log in or register to reply here.

DTT Light or Dark

  • DTT Light
    • www.jadusmotorcycleparts.com
    www.lostapostle.ca/
    www.sparckmoto.com

    Spread the Love

    Back
    Top Bottom