I am planning to use a pair of monoblocs on my Triton (T110 crackcases, 650 alternator crank, Morgo 750 big bore kit, 3134 inlet and ex cams, T140 10 stud head, baffled reverse cone megas), the bike is being built as a road bike.
I am thinking about using 1-3/16" 389's. I have seen recommended settings in the book "Super Tuning AMALMonobloc... by Jeffrey Diamond" based on this and other references ,I'm thinking of pilot 30, main 360, slide 3-1/2, needle 106, (possibly a bit rich?) as a starting point.
I'd be interested to hear from anyone who has used Monoblocs on a Triumph 750 twin on size, set up and performance; or any advice on this configuration.
Hi Just an observation Two 389's will cause a problem with accessing the adjustments on one of them The mirror image carb (partner) of the 389 is a 689 I like mono's far superior to concentrics in my opinion Is there room for Monobloc's on a parallel port T140 head?
Yep, and the bike is still on island. Looking forward to revisiting it here some day soon. Certainly the fastest pre unit in the state, maybe the fastest Triumph. I seem to recall it has 1 1/8 Monoblocks on it. There isn't much advantage to the larger carb unless you're running WFO all the time. Which is a possibility. Having a bike like this with this much power is way too tempting. Riding in a normal fashion seems utterly ridiculous. Those settings seem like a good place to start. Monoblocks use .1065 needle jets, tho.
Forget about fuel economy with those jets....
Bikes is '55 T110 with nine bolt top end and JRC 750 kit and one piece crank. (have to have that with this much power) I seem to recall the cams being Megacycles, but 3134's will do pretty good. Wheelies and burn outs.....piece of cake.
Bikes 1974 Commando 1985 Honda Nighthawk 650 1957 Thunderbird/T110 "Flying Tiger" Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
Re: Monoblocs on a 750
#699556 06/25/1710:56 am06/25/1710:56 am
Not the same configuration but I'm using a 389 mono on my TR6R and I like the response far more than the Concentric. Of course tuning for single carb is ridiculously simple compared to what you're up against. However, if your floats are in the right location the rest should be the usual fiddle with a two carb head.
Not the same configuration but I'm using a 389 mono on my TR6R and I like the response far more than the concentric. Of course tuning for single carb is ridiculously simple compared to what you're up against. However, if your floats are in the right location the rest should be the usual fiddle with a two carb head.
Thanks Bola, this is good to hear. I must admit, my initial reason for considering Monoblocs was that I think they are a better looking carburettor than a Concentric and more in period for a 50's style cafe racer.