75 CB360 - bad omen "yatagarasu" build

jpmobius

where does this go?
DTT BOTM WINNER
irk miller said:
There are two types of dual point distributors- 4 lobe and 8 lobe. Mallory, iirc, made a double life 4 lobe that fired alternating points, so each one fired 1/2 the cylinders. My understanding, so correct me if I'm wrong, was the 4 lobe wasn't for dwell but to push flutter into higher rpms and for longer life.
I believe you are correct sir! Hadn't thought of that. That 4 lobe unit worked like a normal single point unit x 2, though I never fooled around with one. I think higher rpm was the goal like you say though the rubbing blocks should last twice as long as well as the contacts. "double life" rings a bell, but I don't remember that being the claim to fame. I remember the 8 lobe as a pita to get right, though I had a whole lot less experience back then!
 

whynot

~~~If it ain't raining, I'm riding~~{iii}?~~prost~
Re: 75 CB360 - bad omen "yatagarasu" build

MiniatureNinja said:
All I know is that if you touch the points and a ground with your fingertips it fucking shocks the shit out of you

Sent from my SM-G955U using DO THE TON mobile app

Ha Ha....!!!

Shit hurts don't it?

Trust me....been there, done that.
 

MiniatureNinja

Member
DTT BOTM WINNER
Re: 75 CB360 - bad omen "yatagarasu" build

Got the bike running today! As it turns out, if you leave the little bolt and washer that holds the points cam and advancer onto the cam it will jump out of time and make it impossible to start and get running again until you figure that out.
Nothing like timing an engine perfectly, knowing it was done correctly and chasing a problem around because your work was undone by a simple bolt.

Bike starts up great, just a tap of the starter button and it roars to life.
Only problem is that of you give it some throttle it takes a second or two to return to idle, I'm sure that's either a vacuum leak or carb sync. I wasn't able to sync carbs because the set of gauges I have the needles bounce all over the place widly, ill have to get some flow restrictions or something but I'll have to figure that out next week. First time I get to ride the bike is the 17th!
 

MiniatureNinja

Member
DTT BOTM WINNER
Re: 75 CB360 - bad omen "yatagarasu" build

I am looking for suggestions for a mount for the rear... thinking a knurled thumbscrew or something, right now it's just a brass spacer in there which holds it in place but not down. I was gonna do a wingnut but there isnt enough space
 

Attachments

adventurco

Nick Ol' Eye
DTT BOTM WINNER
Dzus fastener? You can get them with a flathead or wing style. Not sure if it would fit for the application, but they are slick.

 

trek97

No Custom Title
DTT BOTM WINNER
Knurled thumb screw or nut.

https://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=Knurled+thumb+nut&rh=i%3Aaps%2Ck%3AKnurled+thumb+nut

https://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=Knurled+thumb+screw+m6
 

MiniatureNinja

Member
DTT BOTM WINNER
trek97 said:
Knurled thumb screw or nut.

https://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=Knurled+thumb+nut&rh=i%3Aaps%2Ck%3AKnurled+thumb+nut

https://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=Knurled+thumb+screw+m6
nice - I like these ones, just wish they weren't 18$ !!



maybe I can find some at my local hardware store
 

Sderbyshire

Into Sailing, classic Triumph cars and motorbikes.
Re: 75 CB360 - bad omen "yatagarasu" build

MiniatureNinja said:
Nothing like timing an engine perfectly, knowing it was done correctly and chasing a problem around because your work was undone by a simple bolt.
You were lucky my friend !, when i didnt tighten up a bolt it all went horrible as you know !

On the high idle i’ve found on mine that throttle cable tension can be a factor, ie tighten up the return cable.

Steve
 

MiniatureNinja

Member
DTT BOTM WINNER
Re: 75 CB360 - bad omen "yatagarasu" build

Sderbyshire said:
You were lucky my friend !, when i didnt tighten up a bolt it all went horrible as you know !

On the high idle i’ve found on mine that throttle cable tension can be a factor, ie tighten up the return cable.

Steve
Yea I was quite amazed how quickly your project progressed compared to mine... but delays happen and it just gutted me to see what happened. Live and learn I guess.


As for return cable.. I dont have one, I do have a backup return spring on the throttle cam though, and it snaps back with the force of a mouse trap.
I'm certain it's the carb sync, the left cylinder is dragging the right cylinder with it due to how far they are off... I can feel it in the exhaust pulses
 

crazypj

Split personality, I fake being smart
Put the spare main jets into vacuum lines as restrictors.
You'll have around 300v reverse EMF at points, tickles a bit ;)
Whats max diameter and thread of seat nut? isn't a big deal to make one in 6061
 

MiniatureNinja

Member
DTT BOTM WINNER
crazypj said:
Put the spare main jets into vacuum lines as restrictors.
You'll have around 300v reverse EMF at points, tickles a bit ;)
Whats max diameter and thread of seat nut? isn't a big deal to make one in 6061
1/4-20 or m6

I bought a knurled nut threaded for #10 machine screw, will drill and tap to m6
 

Popeye SXM

Also used for MX
Depends on how you use the clutch, hard abuse (hard starts, wheelies etc) with 42hp I would expect it to brake but take it easy, why not?
 

Sonreir

Oregon
DTT SUPPORTER
Wouldn't most of the forces be on the plates anyway? I always thought that basket just kinda held stuff together...
 

irk miller

You've been mostly-dead all day.
DTT BOTM WINNER
Since the basket is holding the plates and power is transferred from the gear on the crank to the gear on the countersprocket shaft, I'd say the basket is feeling quite a bit of torque.
 

MiniatureNinja

Member
DTT BOTM WINNER
indeed, that big gear outside the basket is what drives the trans from the crank - it holds all the power

but all the wear or damage I have seen to these clutches are in the plates or the basket getting sawtoothed from the plates like below



I have a spare basket... i think im gonna give it a go
 

Sonreir

Oregon
DTT SUPPORTER
irk miller said:
Since the basket is holding the plates and power is transferred from the gear on the crank to the gear on the countersprocket shaft, I'd say the basket is feeling quite a bit of torque.
Yeah... I think I'm picturing it now?

Crank turns the primary and outer basket and power is transferred to the main shaft through the plates and inner basket... right?
 

DTT Bike Of The Month Gallery

DTT Light or Dark

www.cognitomoto.com
https://www.townmoto.com
www.speedmotoco.com
www.jadusmotorcycleparts.com
www.lostapostle.ca/
www.sparckmoto.com
Top Bottom