Mad Daego

Haynes Manual shows Main Jet - 190, Needle Jet - .106, Needle Type - STD, Needle Position - 1 (Needle position starts at top & counts down) Throttle Valve Cutaway - 3

Triumph Replacement Parts Catalogue shows Main Jet - 210, Needle Jet - .106, Throttle Valve Cutaway - 3

Triumph Workshop Manual Shows Main Jet - 190, Needle Jet .106, Needle Position - 1, Needle Type - STD, Throttle Valve Cutaway - 3

As you can see, there are some differences in the Main Jet size. This is something you will have to determine, based on altitude, motor condition, etc. I run premium pump gas, 93 Octane with a mixture of 110 Octane off road fuel, as mine & yours, requires at least 97 Octane. I do run mine with straight 93 Premium w/ethanol when traveling, as that's the best I can get. I've never had a problem with straight '93 Premium, and my Amals are set up stock. My advise is, do it stock and you shouldn't have any problems. Let's see what others say.

Good Wrenching,
roadduster2

 

Well hell buddy, I wasn't expecting MORE choices!

I live in Minnesota, and we get pretty balmy summers, so I imagine that will have some impact. My motor is in pretty nice shape. Tons of rebuild work done less than 2K miles ago and I always run Amsoil. I've been running my needles in the middle slot though. And I also use the highest octane I can buy off a pump, but I've never experimented with ethanol, unless you count smoking the ditch weed that grew wild near the ethanol plant where I grew up in Indiana. And let's call that one a mistake!

 

If your bike has been running ok since the rebuild it does`nt seem anything wants changing,just go with what you`ve got.Make sure to get the Viton tipped float needle to ensure a constant float level.

Good luck

 

In Minnesota, the jets have to big enough to suck a deer fly through. Bob

 

The first part to wear out is the needle-jet.Chances are they are worn bigger.
Get two .106 needle jets.Make sure they are cross-drilled with a 0.035" hole.
Adjust the float levels,and fit new bowl gaskets.Its a good idea to grease these gaskets,so they aren't instantly ruined next time you undo the float bowl.

If you are worried about main jet size,try a bigger jet or two bigger jets.It is possible to jet one cylinder at a time,and they may require different jets.
If you fit a 210 and it 8-strokes at full throttle and high rpm,its too big.If it doesn't 8-stroke with a 200 or 190,then you need a 200 or 190 (either will do).

 

Thank you Mr. Pete. I love clear directions. My needle jets are so worn they are visibly oblonged. Imagine that. Which is why I am also replacing the needles, as it stands to reason that they're accessory culprits.

So these bad boys will do it?:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=160457603583

http://cgi.ebay.com/ebaymotors/Amal...h-Norton-BSA-/200567640981?pt=Motorcycles_Parts_Accessories&hash=item2eb2c35395

 

Mad Daego

Sorry for my confusing post of yesterday. Too much coffee

Now that you've been put on the right path, you should also include two new needles in your rebuild. If your needle jets are that worn, your needles are shot also.

Check out Plewy's you tube videos on Amal rebuilds in this Forum Search and you will see all that needs to be attended to on your job of rebuilding yours.

roadduster2

 

Do all that,but just don't dare file/sand the flanges flat if they are bowed.There are better ways.Use the Triumph o-rings on the flanges,not regular Amal o-rings which are thinner.
I prefer to buy VITON o-rings from an o-ring supplier.
Use genuine Amal needle-jets,stamped "AMAL".

 

219 Viton O-rings



http://www.grainger.com/Grainger/ORing-1RGV8 Here's some o-rings. Bob

 

Just to double check, because none of my paperwork say what model these carbs are, just "Amal concentric," I want the 930 (600/900??) series?

 

Yes you want the 930.

900 series with a 30 mm bore.

 

The 930 is a 900 series carb,30mm bore.If you buy new needles,you get 900 series needles with 2 scribed rings above the circlip grooves (standard 4-stroke needles).
If you replace slides,you need 900 series slides; 3-cutaway.

Other parts like gaskets,float needles,screws can fit both 600 and 900 series carbs.
900 series includes 28mm-32mm bore sizes.
600 series covers smaller bore sizes

 

Thanks for the info Bob. :beerchug