CB 350 2-2 vs 2-1

IanOberholtzer

IanOberholtzer

green behind the ears
Any Ideas here? For a race build?

I have conflicting ideas that I've summoned from reading / combing through others builds and articles.

I'm thinking 2-1 has low end advantage, weight savings, and clearance benefits

2-2 Top end, belly pan is easier to fit, and looks better ( my opinion )

I hope here are strong opinions here.

Also, how to make this as cheaply as humanly possible, is another intrest of mine past design


- Ian
 
Race build - twin pipes with reverse cone megaphones and absorbtion silencers.
 
It would be 2 into 2 for me too
Not sure how to do it cheap though other than chopping up an existing exhaust and buying a couple cheap reverse megaphones off ebay or something
 
Thats my current strategy, the stock headers are just so heavy

I guess ill buy some decent / light cones, clamp or weld em upswept to the stock headers then when I do a more serious motor build replace them with fabbed ones.
 
I installed a pair of short reverse-cone megaphones clamped directly on the stock headers on my K4 (no upsweep). Looked great and sounded fantastic. They were straight through pipes, so a little on the loud side.
 
Stock headers are double walled to stop them from going blue. You can have some new single wall pipes bent up or see if you can but a set of bends in a suitable size and cut and paste them together into the required shape (so to speak).
 
I would do a 2:1, 350 is a 360 degree twin so pulses are nice and even.
The math is a lot more difficult though
I know I'm losing a little on 360 with 2:1 (180 crank), but, it's all good ;D
 
Are you 100% sure the 350 is a 360° twin? The points are at a 90° angle and all of the other 360° twins that Honda makes from that era only have a single point?
 
I haven't been into one for years, but, I've seen 360 and 180 cranks for 350 (even though they never made them? :eek: )
 
crazypj said:
Maybe it was an SL? I have seen a 360 degree crank in a CB350
Click to expand...

Maybe the CJ360? That's the only old Honda twin I know of with a 360 crank.
 
Nope. I have a CJ360 and it is definitely 180°.

Only 360° Honda twins I know of are the small ones... 160s and 175s... Maybe 200 as well?
 
Nope, it was a 350
I've had a load of CB and CJ (still have most of them)
Haven't worked on a 450 since about 1978~79, simply forgotten what I've done over the years (probably 8~9,000 bikes, maybe more?)
I ran workshops for years, we could easily have 15~25 bikes a day going through,(our 'record' was 27, with only 3 techs plus 'apprentice')
I often had to help with troubleshooting and got involved with a lot of stuff (particularly when it got interesting ;) )
It's also been my hobby since 1968 ;D
 
Must of been a Special..my CB350 ('69) was a 180 crank. Inn fact, the CB/Cl/CJ 360 use the same advancer as the 350...Point set is the same, only a diameter difference difference on the backing plate.

The Timing marks on Both the 350 and 360 are 180 deg. apart too.... 2 coils too....360 only needs one set of points and a dual outlet coil....

Maybe the 360 deg. was a special of some sort? The cam would be a lot different too...
 
No idea, been out of touch with Marc for about 8yrs, wish I'd paid more attention at the time ::)
It was out of a Honda race motor though, (brought down from the frozen north - ice racer)
 
180 cranks make less low end than 360 (degrees)so maybe they wanted more traction or pulling power. A friend of mine ran a CB72 as a 360 but as a twingle. Don't ask me why. :) Dream 305s were 360 of course. Haven't heard of a 360 degree 350 or a 350 degree 360 if it comes to that. ;-)
 
I wonder if a dream crank will be a direct fit in a 350?
It could be that's what happened
Totally screwed up the exhaust thread haven't I ;)
 
Distracted, who me? No. Cranks are completely different IIRC. Could have followed the same idea though.
 
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