CB360 - working on it on the weekends

Got to agree about 360's, they are old, slow, vibrate and are great fun ;D
Probably have more 'character' than almost all Japanese bikes and definitely bikes from Honda lineup which are basically excersize
For a production line bike it has the 'qualities' and foibles of something hand built 8) 8)
I think it's why I've always treated them like a Triumph 500 twin
 
Awesome looking bike! Reading about how you got it finally running right and taking it out for a good long rip got me stoked on getting mine wrapped up. Never had a motorcycle before, but the 360 is an absolute blast!
 
That Mike's XS condensor, is it the XS650 condensor or the one for RD's?
 
Still buzzing when I think about it, can't wait for my next date on the bike ;D

RalleyTuned said:
Awesome looking bike! Reading about how you got it finally running right and taking it out for a good long rip got me stoked on getting mine wrapped up. Never had a motorcycle before, but the 360 is an absolute blast!
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There were (and I'm sure still to come) times when I was really bummed out about the bike, things wouldn't work, one thing after another, but don't regret any of it. Good times come with the bad, and those good times are great!

OJ said:
That Mike's XS condensor, is it the XS650 condensor or the one for RD's?
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Used the 650 one, not the RD on MikesXS. Couldn't tell you the difference between them, but it works fine
 
Funny you mention, I just broke down the other day right as I was turning to ride back on the farthest I have taken the bike yet haha! Got home and it fired right up of course, but I know breaking down at this point of the build is almost surely going to happen on a few occasions! hahaha
 
Wheee done with finals, summer break, more time for riding and wrenching 8)

Put new plugs in, took her for a ride to see what the plugs looked like afterwards. Beautiful day as usual, so I cruised down to PCH and rode up through Laguna to Newport. Planned on taking it easy and enjoying the scenery, but she was begging to be ridden hard, so instead I had fun splitting cars and revving the motor up when I could. Stopped for a hot dog, no parking? No problem! Finished eating, and rode out of Balboa Island back onto PCH. Lots of bikers out, lots of waves thrown back and forth, good times. I cruised through a rode off of PCH through a canyon, and since it was a two lane street I had to keep the bike quieter and kept the RPM low. Coming out of the canyon, I gave her some juice, but then the light changed and I had to come to a stop quickly. Pulled in the clutch and pulled on the brakes, but then the bike died. :'( Tried to start her back up, but she wouldn't come on, so I pushed to the side of the road. She would start up only when I gave it some gas, but then it kept wanting to die so I had to rev the throttle even at lights with the clutch pulled in, lots of engine braking, tried to avoid left turns, etc. This is becoming common on my bike. Made it back, didn't have time to properly mess with it, but plugs looked pretty black, bike would still try to start but not catch unless I gave it gas. Thinking it's carbs, spark and battery voltage looked good, wires intact, etc. Going back in on Monday to pull carbs.

And here are pictures!

2zOius6.jpg


ke5LLxu.jpg
 
black plugs. too rich. my bike was doing the same thing when i first put it back together. i had 115s in. riding up and down the street a few times was fine. then the last few it started running rough. pulled the plugs to find them blackkkkkkk (one side more than the other) we put 110s in, sync'd the carbs, new plugs and rode around more, pulled the plugs again and they were an even brownish on both plugs.
 
Pretty sure there are 115 in there?
Didn't you originally have/want a short open exhaust?
 
I got the carbs back from PJ with 115 secondary mains, I got new sets and I think there are 122 or 125 in there now, I still have the 120 and whatever I didn't use sets too. I was planning on syncing the carbs after the ride based on how she ran and how the plugs looked, so looks like I'll have to change a few things. Exhaust isn't very short, still goes to the rear wheel hub but isn't stock, and running at more or less ocean level
 
You can use smaller jets with long exhaust, even if it is 'mostly empty' ;)
You have stock head pipes?
They are relatively small inside diameter which keeps gas speed higher, Florida is only about 136ft above sea level where I am so you'll have to play with secondary main jets some more.
You haven't adjusted float level?
It should be 21mm for 'K&N' filters
Where are mixture screws?
further out is richer but shouldn't need more than 2.5 turns or less than 3/4 turn
 
Okay so I was wrong, I had the 120 secondary mains in the carbs and the plugs were pretty black, float levels were off but not by too much, set them back to 21mm. Those little metal prong things are annoying :mad:

Put the 115 jets back in that PJ drilled out when he had my carbs, back on the bike after hunting for a clip that came off. I started playing with the mix screws at two full turns out, then two and a half turns out from there seemed to be okay. Bike sounded better, so I took it around the block, still had some problems stopped at a light with the clutch pulled in. Sounded like it was firing on one cylinder again, throttle was slow to rise and sounded thick, but when I pulled into the parking lot again it sounded fine. Checked the spark at the plugs, looked beautiful, fat blue sparks on both sides, so definitely has to be gas. Planning on syncing and doing a plug chop tomorrow.

Also ordered new wheel bearings, get some tubes on the way to the shop and bring in the Metzelers I got from Chewy on this forum as well. 18x4.0 rear, 19x3.5 front, I know I'll be losing some performance from these sizes but for now they'll do to be tuning the bike, planning on getting some Shinkos or Avons eventually.

Another thing I was wondering, sometimes I'll hit my turn signals and they won't come on, or they'll be weak, is this probably just because the bike's not revving high enough and not charging? Rear LED brake/tail and blinkers, front standard blinkers

Goal is to get the bike running well before Saturday so I can take it on a canyon run with my mechanic and some other sportbike guys, the road is twisty enough so I might be able to embarrass some unsuspecting riders who can't wind up their inline 4 quick enough 8)
 
A total of 4 1/2 out turns should prove to be too rich. with stock 35 pilots and 68 main primaries. The reason you found her running on one cylinder. "She just cant get enough air captain."
Set em at 1 1/2 turns out. then ride her enough to get her good and warmed up. Then run her as long as you can as steady as possible (1800 rpms=pilot) Plug chop. Then another @ (4500=main primary), Then another at (6500 - 7000=main secondaries). If your main secondaries make your pugs clean and bright white. Shes leaning out and could get too hot.
A lot of guys say you can get a good plug reading if you run at desired rpm for 15 -30 seconds.
What works for me when checking pilots and primaries (if Im NOT afraid of a lean condition) I run her about 2 miles.
If you fear a lean condition do not run her that long. She could burn a hole in piston or valves!
Dont get out there and run her 8000rpm for 2 miles! Because in real world conditions, how much time are you gonna spend at 8000+ rpms...milliseconds. Unless of course your name is Sonrier. ;)

If she is fully warmed up and If she is rich...it should show in 2 miles...bogging, cutting out, choking.
After you make some headway at these rpms. Then you can do more rpm specific chops. And you will find out exactly when your carbs transition through the jets. and exactly what is going on.
example at 5000 fully on primaries, maybe getting a touch lean. at 5500 needle starts to open and your secondaries begin to kick in, things begin to richen up...then w needle open at 8000+ things could go lean again.
 
If the indicators/flashers are 'weak' or dim it sounds like battery isn't charging properly?
Low voltage will cause miss-fires and bad running that can look like a carb issue.
You probably need to run in a lower gear and keep it revving higher?
On a twisty road it's pretty VERY easy to embarrass a 'squid' on bike with 3~4 times the power you have, I mostly kept up with a $23,000 Ducati Paul Smart Replica, we 'lost' his buddy and the rest of the group ;D 8)
Running at 90+ mph on 37 yr old tyres wasn't smartest thing I've done, when I remembered, I slowed down a LOT, good xcuse, give everyone a chance to catch up ;)

trek97 said:
Dont get out there and run her 8000rpm for 2 miles! Because in real world conditions, how much time are you gonna spend at 8000+ rpms...milliseconds. Unless of course your name is Sonrier. ;)
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I resemble that remark ;D
your 'safe' to 10,000 rpm, even though power has dropped off by 9,500, USE ALL THE RPM (and scare people 8) )
 
Okay turned the mix screws to two full turns out from closed, tried to start it up, oh what's this, petcock is leaking. Never noticed this before, but this might be part of the problem. Pulled it off and it looks like this

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DOBN4j7.jpg


then the gas tank looks like this

3TJZPmd.jpg


When petcock was set to open, gas still wasn't draining at a certain point, so looks like this needs to be rebuilt. We'll see what effect that has on the bike
 
Ucky, that looks pretty nasty. :eek:
I think you have found one more problem 8)
Has tank been sealed with tap in place?
I had to make various pieces for mine, but, it's probably easier and cheaper long term to just get a new one
The one I re-built is working fine but I've bought a couple in last year or so ::)

http://www.hondacb360.com/parts/fuel-system/

You can also ind them new on eBay
 
Yeah it looks like someone did treatment to the tank with the petcock on, but I managed to clean the petcock up pretty well with solvent and CLR, found some o rings around the shop and just waiting for them to dry to put it back together. Still feeling optimistic about it, hoping I don't have to order more parts ;D

Oh and I figured out why my reserve wasn't working, the reserve hole was clogged by a piece of the o ring. Looks pretty clean now though
 
crazypj said:
I resemble that remark ;D
your 'safe' to 10,000 rpm, even though power has dropped off by 9,500, USE ALL THE RPM (and scare people 8) )
Click to expand...

Properly tuned I buy that...But not if she is starting to lean out at 7-8000 and getting leaner. Lets see that pic of your piston w the hole in it again.
 
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