Help identifying heads and carbs!!!!

[Dirtybird]

What are these? All are supposed to be off of Yamahas. All are Mikuni carbs. One is a Westcoast(?) head and the other is a Riva. Any ideas on what performance wise these are or if they are any good? Thanks!!

 

[Dirtybird]

 

[Kaveman]

Westcoast head is a 650/701/760 shell. I believe the domes are 701 at 29cc.

 

[vitalikol]

Double carbs are 44mm single with red top and 3 bolts -38mm.
4 mounting bolts on top --44mm
3 mounting bolts on top --38mm

 

[snowxr]

The carbs look to be ( in order ) Converted Dual SBN 44's on 61X manifold, single SBN 38, and a single SBN 44 on stock intake.

The riva head has 35cc domes ok for pump premium. The head was a match for their cast cylinder.

Westcoat 701 head had 29cc domes. High compression.

 

[Kaveman]

Riva head is 650/701/760 with 35cc 701 domes. The carbs with the red spigot mount adaptors with 4 bolts are 44mm Mikuni. The carbs with the red spigot mount adaptors with 3 bolts are 38mm Mikuni. The carb with the blue spigot mount adaptor is a 44mm Mikuni on a 61x or 6m6 manifold. Check the factory marking to determine whether it is a 650 (6m6) or a 701 (61x).

 

[Dirtybird]

Snowxr what exactly do you mean when you say they are converted dual sbns? Thanks for the help guys. Also on the duals they have t handle adjustment screws none of the others do,any reason for this?

 

[vitalikol]

T-handle you can adjust by hand and other you need flat screewdriver or small wrench. or special tool so you can do it easyer

 

[SUPERTUNE]

Snowxr what exactly do you mean when you say they are converted dual sbns? Thanks for the help guys. Also on the duals they have t handle adjustment screws none of the others do,any reason for this?

I think he means that converted to AFTERMARKET SBN dual 44's, from a oem 61x single carb and manifold.
'T' handles is the way AFTERMARKET carbs come with, as the others are oem units from stock Yamaha. (had plastic caps on them originally)
Use the aftermarket duals!

 

[DangerBoy]

Looks like the duel 44s have some Carbon reeds also