Honda Twins banner
1 - 8 of 8 Posts

·
Registered
Joined
·
109 Posts
Discussion Starter · #1 ·
I have a couple questions I was hoping someone on here could answer.


#1: Does anyone know whether the later stamped steel triple clamp used on the CB/CM400 will easily adapt to my CB360? Yes, I know this is a weird idea, but they are cheap, easy to get & probably not crack prone, unlike the stock part.

#2: Is there anyone on here who can tell me whether carb insulators from an 80 - 84 Yamaha XS650 will bolt up to a CB350?? This is the one that used the 34mm Mikunis. This would allow me to easily source proper carb insulators for my modified 360 instead of having to modify a new set of stock Honda ones & the XS650 ones have sync ports.

#3: Does anyone know how to interpret Mikuni jet needle numbers?? I need richer needles for my carb conversion .. maybe the ones Mikes XS sells will work??
 

·
Registered
Joined
·
6,495 Posts
On my mutant 450, a 400T front end bolted right up to a 360 stem/triple clamp. I believe the 400T and 450T (Hawk, not the old DOHC 450) are the same thing in this respect.
So I'd say it would work the other way around, too - but you'd have to use the 400T stem and triple clamp as a unit.
The 400T stem is a bit shorter than the 360, because of the flat steel triple clamp. So it wouldn't work with the 360 stem plus a 400T triple clamp.
I think the offset is a little different too, but that shouldn't affect what you're trying to do.

And you'd be on your own as far as mounting the speedo/tach, as the two bikes are totally different in that context.

I just happen to still have the 400T stem and clamp in my shop......
 

·
Registered
Joined
·
109 Posts
Discussion Starter · #4 ·
tbpmusic said:
On my mutant 450, a 400T front end bolted right up to a 360 stem/triple clamp. I believe the 400T and 450T (Hawk, not the old DOHC 450) are the same thing in this respect.
So I'd say it would work the other way around, too - but you'd have to use the 400T stem and triple clamp as a unit.
The 400T stem is a bit shorter than the 360, because of the flat steel triple clamp. So it wouldn't work with the 360 stem plus a 400T triple clamp.
I think the offset is a little different too, but that shouldn't affect what you're trying to do.

And you'd be on your own as far as mounting the speedo/tach, as the two bikes are totally different in that context.

I just happen to still have the 400T stem and clamp in my shop......
That is kind of what i have been wondering is if i could just swap the clamp or if i needed the whole tree. I have been thinking of just converting the bike to a part I should never have to worry about ever cracking again and install tapered roller bearings at the same time.

I have done a bit of looking at pics of 400 clamps & the gauge mounts don't look to hard to deal with to me . . .I should be able to make mount plates to sandwich between the aluminum bar mounts & the clamp plate or attach to the bolts under it . Of course I need one in my hands to actually check out in order to verify this.

You looking to get rid of that???
 

·
Sensei
Joined
·
27,183 Posts
I'm not certain about the "steel top" forward offset being different or the same, (never had one) but the width definately is....Using Bill's matched top and bottom trees would be the way to do it properly... You will however also need the "special" top cap/bolts that fit with the steel tree as well... They should screw right into your tubes......
If you decide to "try" using just the steel top with your "old" stem and bracket and the offset is indeed the same (as I believe it is) you can probably "space" it correctly by using an extra ("jam") nut on the stem underneath the tree....(perhaps Herr Deacon would measure his forward offset for comparison)...... I have quite a collection of extra stem nuts, and would gladly donate one for just shipping cost..... E-mail me if you need one.... Steve

BTW... I have never seen a PROPERLY installed/torqued 360 aluminum top tree crack EXCEPT from an accident...... Most often they crack from improper tightening sequence or over torquing .. (IMPROPER install)
 

·
Registered
Joined
·
6,495 Posts
66Sprint said:
I'm not certain about the "steel top" forward offset being different or the same, (never had one) but the width definitely is....Using Bill's matched top and bottom trees would be the way to do it properly... You will however also need the "special" top cap/bolts that fit with the steel tree as well... They should screw right into your tubes......
Yeah, I forgot to mention that - the 400T top clamp is actually held in place by the fork cap bolts - there aren't any pinch clamp thingies like on the bottom clamp.
The 400T fork "caps" are no longer available - I may have kept the old ones - I'm not sure, they were rusty and may have got tossed.
I replaced them with early CX500 caps, which worked in the 360 top clamp just fine.

Sure, I'd sell the stem and clamp......
 

·
Registered
Joined
·
109 Posts
Discussion Starter · #7 ·
tbpmusic said:
66Sprint said:
I'm not certain about the "steel top" forward offset being different or the same, (never had one) but the width definitely is....Using Bill's matched top and bottom trees would be the way to do it properly... You will however also need the "special" top cap/bolts that fit with the steel tree as well... They should screw right into your tubes......
Yeah, I forgot to mention that - the 400T top clamp is actually held in place by the fork cap bolts - there aren't any pinch clamp thingies like on the bottom clamp.
The 400T fork "caps" are no longer available - I may have kept the old ones - I'm not sure, they were rusty and may have got tossed.
I replaced them with early CX500 caps, which worked in the 360 top clamp just fine.

Sure, I'd sell the stem and clamp......
So, what's that stem & clamp worth to you?

I am aware that the CB/CM400 top clamp is held in place by the fork cap bolts.
Any idea whether the stock CB360 cap bolts will work??
How hard to find are CB/CM400 cap bolts??
 

·
Sensei
Joined
·
27,183 Posts
The 360 top caps (bolts) will NOT work....
The 400 ones are NLA from Honda, discontinued.....
They were specific to the steel bridge models, so may be scarce, even in junkyards....
 
1 - 8 of 8 Posts
Top