Bonneville America Forums Forums Technical Forums Exhaust short pipes poppin´

Since I use the original Triumph "sport pipes" / short loud exhausts / I got a lot of heavy poppin´ there. As they told me there´s no need to change any jets in the carb, may be the problem is to solve by opening the mix-screws a bit more. In German Words to "das Gemisch fetter einstellen" / kind of "making the mixture a bit fatter" (?) But I´m not sure. Can anyone help me locating those screws (PICTURE / PHOTO /and how to open / advise / suggest how many windings.... or so... ????
Tks from Berlin / Germany!! :-)

All you ever wanted to know about Bonnie carbs:

http://members.bluefrog.com/~pwhitbec/Triumph/carbs0.html

Once you locate the diagram and the idle screw, most of us have found the factory setting near fully closed and running extremely lean (hot) at idle, and a good start is to run them gently to close and then open about 3 to 3.5, if you're careful the adjustment can be made with the carbs on the bike... but hell, do a search and read the posts, don't just listen to me... I broke my BA last night and now I'm commuting on the stupid u-bahn, as it were.

Man, I worked at TCA for a few years back in the 80's. Great city you're living in.

Hello and Thank you! I think this helps. Final question: Where to find the diagram and the idle screw (the one to screw to change the mixture)?

This page shows a close-up of the bottom of the carb opened up. Don't worry about that. The left pic, top arrow, center screw is the screw you need to work with. From stock, up to early 04's have a security cap (or at least they did in the States) that has to be removed to access the screw. Later models have a different screw, a "D" head that requires a special tool, or a piece of small tube to turn.

http://members.bluefrog.com/~pwhitbec/Triumph/carbs7.html

Dankeschön! Many thanks! :-)

No one on the forum (that I've seen) has reported being able to eliminate ALL of the popping with the Triumph TORs. I'm still working on mine. Some say they've turned the screws out as much as 5 turns. 3 1/2 seems to be average. Removing the AI helps. "Fattening the mix" helps. Several thing seem to help, but so far nothing seems to really fix it. I like the sound of the TORs but sure hate the popping!

Hello Mathias,
I ran the short TORs for a long time. In my opinion, they need 125-128 jets. To get rid of popping, I had opened my mix screws until the decelleration popping stopped. Then, I got backfire through pipes when decellerating.
So, with these pipes, you need 125 mains, Thunderbird Sport needles and turn mix screws out 3 turns, then adjust from there. That way you won't hurt anything and can run well until you get the "perfect mix". Main Thing! Check out Dinqua's link above. You'll understand.
Ride Safe,
Dennis