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#699520 - 06/24/17 7:01 pm Monoblocs on a 750  
Joined: May 2006
Posts: 257
Bry Offline
Bry  Offline



Joined: May 2006
Posts: 257
Scotland
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 AMAL Monobloc... 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.


1946 Velocette MSS
1955 Triton (project)
1959 Velocette Venom
1966 Triumph T120
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#699522 - 06/24/17 7:20 pm Re: Monoblocs on a 750 [Re: Bry]  
Joined: Feb 2014
Posts: 362
chaterlea25 Online content
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chaterlea25  Online Content
BritBike Forum member

Joined: Feb 2014
Posts: 362
Cork Ireland
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?


John

Last edited by chaterlea25; 06/24/17 7:22 pm.
#699525 - 06/24/17 7:35 pm Re: Monoblocs on a 750 [Re: chaterlea25]  
Joined: May 2006
Posts: 257
Bry Offline
Bry  Offline



Joined: May 2006
Posts: 257
Scotland
Thanks John, it's a splayed head so access should be OK; although not as convenient as a 689, but I already have the necessary long thin screwdriver for my Bonneville that has 389's.


1946 Velocette MSS
1955 Triton (project)
1959 Velocette Venom
1966 Triumph T120
#699530 - 06/24/17 9:59 pm Re: Monoblocs on a 750 [Re: Bry]  
Joined: Jun 2007
Posts: 5,450
HawaiianTiger Online content
BritBike Forum member
HawaiianTiger  Online Content

BritBike Forum member

Joined: Jun 2007
Posts: 5,450
Maui Hawaii
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.... grin

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.

Cheers,
Bill


Bikes
1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Flying Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
#699556 - 06/25/17 10:56 am Re: Monoblocs on a 750 [Re: Bry]  
Joined: Sep 2014
Posts: 444
Tigernuts Online content
BritBike Forum member
Tigernuts  Online Content
BritBike Forum member

Joined: Sep 2014
Posts: 444
Naarfuk, UK
Will a T140 head fit on a Morgo 750 block?


If anything other than a blank space is visible here, something's wrong.
#699559 - 06/25/17 12:27 pm Re: Monoblocs on a 750 [Re: Tigernuts]  
Joined: Aug 2001
Posts: 6,881
triton thrasher Online content
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triton thrasher  Online Content
BritBike Forum member

Joined: Aug 2001
Posts: 6,881
scotland
Originally Posted by Tigernuts
Will a T140 head fit on a Morgo 750 block?


Not totally easily.


Amateur Loctite enthusiast.
#699570 - 06/25/17 3:59 pm Re: Monoblocs on a 750 [Re: Tigernuts]  
Joined: May 2006
Posts: 257
Bry Offline
Bry  Offline



Joined: May 2006
Posts: 257
Scotland
Originally Posted by Tigernuts
Will a T140 head fit on a Morgo 750 block?


It does on the one I have. Morgo can supply a 10 stud version of their big bore kit by special order.


1946 Velocette MSS
1955 Triton (project)
1959 Velocette Venom
1966 Triumph T120
#699595 - 06/25/17 10:38 pm Re: Monoblocs on a 750 [Re: Bry]  
Joined: Sep 2014
Posts: 444
Tigernuts Online content
BritBike Forum member
Tigernuts  Online Content
BritBike Forum member

Joined: Sep 2014
Posts: 444
Naarfuk, UK
Originally Posted by Bry
Originally Posted by Tigernuts
Will a T140 head fit on a Morgo 750 block?


It does on the one I have. Morgo can supply a 10 stud version of their big bore kit by special order.


That's worth knowing, could be useful.


If anything other than a blank space is visible here, something's wrong.
#699607 - 06/26/17 12:22 am Re: Monoblocs on a 750 [Re: Bry]  
Joined: Aug 2010
Posts: 588
Bola Offline
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Bola  Offline
BritBike Forum member

Joined: Aug 2010
Posts: 588
Toronto, Canada
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.

#699776 - 06/27/17 9:59 am Re: Monoblocs on a 750 [Re: Bola]  
Joined: May 2006
Posts: 257
Bry Offline
Bry  Offline



Joined: May 2006
Posts: 257
Scotland
Originally Posted by Bola
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.


1946 Velocette MSS
1955 Triton (project)
1959 Velocette Venom
1966 Triumph T120

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