75 CB360 - bad omen "yatagarasu" build

MiniatureNinja

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I burned the shit out of my leg when I first started riding it.
a lot of people really like the exhaust and have offered to buy it or take it off my hands. I have CJ exhaust, which I like the looks of exhaust that is lower - but I plan to custom make a 2-2 exhaust that goes along the side of the bike like the CJ, but instead of the merge collector, it will have two upswept reverse cone mufflers.
 

trek97

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MiniatureNinja said:
I plan to custom make a 2-2 exhaust that goes along the side of the bike like the CJ, but instead of the merge collector, it will have two upswept reverse cone mufflers.
I see and yea a pretty neat plan.
I built mine to accommodate the rearset pegs.
This winter I was planning to lower my pegs a bit, while I had engine out for 378 conversion.
The dang weather has slowed progress on my wifes 78 Hondamatic. So not sure if I will get to my bike. ::)
 

MiniatureNinja

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trek97 said:
I see and yea a pretty neat plan.
I built mine to accommodate the rearset pegs.
This winter I was planning to lower my pegs a bit, while I had engine out for 378 conversion.
The dang weather has slowed progress on my wifes 78 Hondamatic. So not sure if I will get to my bike. ::)
I bought the bike with the Old School Speed rearsets on there - I absolutely could not stand them. The right angle joins they used were totally wrong and downright dangerous for that application. I bought some spherical rod ends and made it about 100x better, but still ended up finding someone on Reddit that traded me straight accross for stock foot controls. I also chopped off the passenger peg mounts already. if (big if) I decide to go with rear set controls I will custom mount them, but I doubt I will, I like they stock position even with clipons (i'm short 5'7" and 130lbs)
 

MiniatureNinja

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this is my inspiration for exhaust, not sure what or who this picture is from. but I want to have the mufflers look like the old super sport 4cyl bikes but just on the one side
 

crazypj

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I built a right side exhaust on my '391'
Used parts from a 3 valve CB/CM250/400, Ford Escort (FWD) and some 2" dia pipe I pulled from a skip (we don't 'do' dumpsters in Britain) It was no where near interfering with kick-starter.
 

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MiniatureNinja

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yea see, my limited time frame and product availability I just had to work with essentially straight pipe and the left over parts from the cut down exhaust - I wanted to ride it that weekend. Now that winter has struck I am going to be doing things a lot more proper. it's amazing what can be done with proper planning and skills. neither of which was available to me last year. LOL
 

irk miller

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crazypj said:
I built a right side exhaust on my '391'
Used parts from a 3 valve CB/CM250/400, Ford Escort (FWD) and some 2" dia pipe I pulled from a skip (we don't 'do' dumpsters in Britain) It was no where near interfering with kick-starter.
Did you ever get that bike back, PJ?
 

crazypj

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Forgot to answer initial question. Nope, but no one has tried to register it either. Friend in Britain checks things for me every so often. If it turns up I'll have to give him legal powers to recover and prosecute the perps. It's a bit expensive to do but still cheaper than me flying home (around £350~£400 or less than $500 instead of $1000~1300 airfare)

irk miller said:
I used the XL250 swingarm on my second 360. It was a super easy swap to dual shocks. And like PJ said, I also used 042 copper base gasket to get deck height right.
I'd forgotten you did 378 conversion. :-[
Couldn't remeber what swing arm you got but remembered you said somewhere about a 'straight swap' (or something close?)
No one believes a relatively small capacity increase can have such a dramatic effect - until they do it.
It's so good you almost want to keep it a secret when chasing down much bigger bikes on twisty roads ;D
(Guy on $23,000 'Paul Smart' Replica Ducati was VERY surprised, his buddy on the 'cheap Duc - about $18,000 couldn't keep up)
I guess ability counts for more than how much money you have - sometimes 8)
MiniatureNinja said:


this is my inspiration for exhaust, not sure what or who this picture is from. but I want to have the mufflers look like the old super sport 4cyl bikes but just on the one side
I like those pipes, from the angle of manifold end they look 'vintage' Triumph?
 

MiniatureNinja

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crazypj said:
I'd forgotten you did 378 conversion. :-[
No one believes a relatively small capacity increase can have such a dramatic effect - until they do it.
It's so good you almost want to keep it a secret when chasing down much bigger bikes on twisty roads ;D
(Guy on $23,000 'Paul Smart' Replica Ducati was VERY surprised, his buddy on the 'cheap Duc - about $18,000 couldn't keep up)
I guess ability counts for more than how much money you have - sometimes 8)
I am really set on wringing a reasonable (daily ridden) amount of performance out of this bike after a friend on a newer cb900 was able to beat me in a gentle race by a good 3-4 seconds. I know riding skill played a part too as he is a much more experienced rider than me, but there were sections I could have used a little more acceleration. (I plan to go with a 37 tooth rear sprocket too
 

irk miller

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I'm running an XL250 rear swinger and wheel, which also has an XL250 42t sprocket. It will get your front end off the ground, but don't expect to top 80mph. That's the downside, but it will wheelie which has it's own brand of fun..
 

crazypj

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I've only ever used 17/34 sprockets. 37 rear may be too much with extra 22cc. You have already got clutch springs from BorTec?
 

irk miller

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They shift way too short with the bigger sprocket, too. At least the 42t.
 

MiniatureNinja

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crazypj said:
I've only ever used 17/34 sprockets. 37 rear may be too much with extra 22cc. You have already got clutch springs from BorTec?
I ordered Barnett clutch springs, BoreTech seams to be going out of business, selling what's left only.
I have a 35, and 34 tooth sprocket already, so I will have the ability to change things up if I need to - 520 conversion BTW
 

crazypj

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Cool stuff, I'm doing 520 on 'Blue Bike' to get the extra tyre clearance
 

MiniatureNinja

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pre-cleaning. Anyone got a recommendation for sending heads out for valve seat work and installing new guides? I think the guy I have locally will do it for $250 which I really dont want to have to buy the tools as much as i want to do some things myself, even the installation of guides will require tools I don't have

Since I plan to port the head I think I should also do this BEFORE I get service done, right?
 

irk miller

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There's a strong argument for keeping the center stand brackets. You can slide the pin out and remove the center stand for riding, then put it back in when you need to service the bike. I kept mine.
 

trek97

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MiniatureNinja said:


Not sure how to tackle this should I grind these off and how?
Centerstand clamps. Absolutely NOT. Keep them for service, carb tuning, chain adj, tire work, etc.
I have my center stand sitting on the shelf. Stick it on just when needed w a 5/8 x 7" bolt, no spring or nothing. I don't even bother putting a nut on the bolt.
 

MiniatureNinja

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bike never had a center stand, will have to find one - I realized it will make some things easier to maintain if I keep the loops and just make it removable like suggested


so what I did was cut off the "stop" and the spring holding loop, then ground the little bump on the bottom off nice and flush so it's a little less noticeable

going to weigh the frame tonight wheni get home - curious how much a stock frame weighs (as in I should have weighed it before I startet cutting and grinding)
 

MiniatureNinja

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crazypj said:
Cool stuff, I'm doing 520 on 'Blue Bike' to get the extra tyre clearance
what size tire? I was able to get about 1mm clearance with a 130 tire on the 360 with stock rear rim.
Not going to do that, 110 rear I think with a 2.15 rim. Not sure yet
 
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