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TR6 mikuni carbs for my TR6

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hondo402000

hondo402000

Darth Vader
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ok long story short, purchased 3 mikuni carbs for the tr6 from a no named source, the cable set up was sad so I had extended throttle shafts made see pic, now its either use 2 on the std manifold or try 3 on the goodparts triple manifold that I purchased, just have to come up with the way to tie the shafts together. I have a lockar cable and bracked I fabed up now just need to install and try to jet in
 

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Well, I don't have a solution for tying them together, but I'm sure interested, as I'm sure many others here are, in the claims that these give you better power AND fuel economy, with better driveability.
I've been thinking long and hard about EFI vs these Mikuni's in a 3-pack.
 
Won't the stock folded couplings work on those puppies.
I know others have tried in vain to use solid couplers but it's difficult to fine adjust in 3 planes and there's too much movement due to differential expansion; the stock devices seem to work the best. Carbs look nice.
 
I am going to check the folded couplings today off the stromburgs, the mikuni shafts are 0.392 which is right at 10mm, I hope they will work, I am sure solid couplers will be a problem
 
If they don't work out, check out Stock Drive Parts or similar for small flexible shaft couplings. They are commonly used in applications where motion must be transmitted between two shafts that each have their own bearings (like a motor to a pump).
 
Ok the original couplings worked with a little grinding with the dremmel tool, now had 2 uses for the dremmel, and the imtermediate shaft purchased at lowes. now a few more brackets to fab and then the install and lokar cable, stay tuned
 

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I'm not gonna look at carbs....I'm not gonna look
at carbs.....

I'm not gonna consider replacing another part that
does not NEED to be replaced....

I'm not gonna look at carbs, I'm not gonna..............................................................................................................................
 
Hello Hondo,

I'm not familiar with these,except that they are a motorcycle carburettor?

Are they like the British Amal which has a needle adjustment in the piston and a variety of piston cut outs (the chamfer at the base of the piston) to adjust the mixture?

I remember that one (very expensive) racing Amal had a needle offset from the choke so at full bore there was no obstruction at all in the choke.

Alec
 
Brosky said:
Just how do you choke these bad boys?
Click to expand...

There is an idle enrichment valve on the back of the carb body. Pulling on the choke cable (which you have to fabricate) shifts a spool within the carburettor body opening a passage around the throttle slide thus richening the mixture and providing high speed idle.
The system actually works well.
 
piman said:
Are they like the British Amal which has a needle adjustment in the piston and a variety of piston cut outs (the chamfer at the base of the piston) to adjust the mixture?
Alec
Click to expand...

Not really Alec. These carburetors do not have a piston and separate throttle plate they utilize a throttle slide. The needle is set in a slide which blocks the choke. When the throttle is opened the slide moves up into a chamber in the carburetor body thus withdrawing the needle from the main jet to allow more fuel to pass. When opened fully the only obstruction in the choke is the slender needle. To adjust the mixture you have to withdraw the needle from the slide to reposition a spring clip to another groove on the stem of the needle.
A nice feature of these carburetors is that they incorporate an accelerator pump to squirt an extra amount of fuel when the throttle is opened. There is no lag time between stepping on the gas and having the car take off.
 
I understand the accelerator response is greatly increased, but can you tell us if the claim of better MPG is valid?
BTW, the claim is by Prirace on their website. If they do deliver on MPG, that might be enough to push me over the edge. /bcforum/images/%%GRAEMLIN_URL%%/driving.gif
 
With my four speed car this past summer I averaged 25 mpg over 1800 miles going to and returning from the VTR in Pennsylvania. I was told by others in my club that it was a good figure but I also had just rebuilt the engine so which contributed more I can not say.
 
Hello Roman,

it does sound like the Amal in principle, that also has no throttle disc. Being more familiar with S.U.'s I referred to a piston but throttle slide is another term. The throttle on an ammal was a cable directly attached to the throttle slide. And it too had the needle held with clips but in addition to that the throttle slide came with a variety of chamfers or cut aways to also adjust the mixture, big cut away meant weaker mixture with the needle position for fine tuning. No accelerator pump though.
What size choke are they?

Alec
 
Hi Alec,
Here’s a link to Mikuni , The HSR carbs come in 42, 45 and 48mm. There is an exploded view of the carb off this page that shows the flat slides instead of the piston on the Amals. I have 3 42mm’s on my Healey 3000.
 
Well I purchase 3- HSR42, a simulated goodparts manifold not sure the supplier got it from goodparts, and it came with this micky mouse accelerator cable set up that was to say the least crap. I put the carbs on and had a time with them running right and got tired of the"I stand behind my product from the supplier, I never got much help and it seemed like once he got my $$ he was done with me so I took them off and bought a set of webbers, I couldnt sell them and Chris(oops) wouldnt take the back so now I am back to trying(experimenting the mikunis,(since I have working carbs now I can take my time and do some fab work. I am in the sales business, long story short, have a connection and got some extended shafts made for free, as seen in the pics, now the carbs have a common shaft, so now I am working on using the lokar cable. wow that was long winded
 
dang Hondo, was still pondering buying your 3'som
 
Don,
sorry I am back at the project but when I am done the guy that made my shafts is going to give me a price for the shafts in case any one else wants to convert
 
Hello Greg,

thanks for the link.

I'm surprised at how big they are (choke size).

Also the only reason I can guess that the slide is rectangular in section is so as to shorten the instrument. Certainly a round slide (as in the Amal) is easier to manufacture to a tight tolerance.

I am still of the opinion, however, that a variable choke carburettor is preferable for a road car with S.U.'s being my choice over Zenith Strombergs. Having said that my Triumph has Lucas Injection.

Alec
 
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