Triumphrat

kawtoy · 04-11-2006

Well looks like the battery was bad. Got a new one today and it fired on the second kick. Sure smokes like a chimney though. The prior owner had been putting Mystery oil in the cylinders and now it just has to burn off. Or so I hope. Now I have a carb questions. It does not want to idle. Where should the air and throttle screw be set as a good base setting? Thanks so much for the help. WOOOHOOO! Best $1900 I ever spent.

texspeed · 04-11-2006

I believe the air screws should be set at about 2 1/2 turns out from "gently" seated??.....only as a lean baseline. As you dial the thing in you'll want to fine tune those settings, most likely richer (less turns out) Don't just set them and forget them, they affect a wider rpm range/throttle opening than you'd think. Also making sure the slides come up at the same time is critical. I always stuck my fingers in the carbs and gently worked the throttle to feel movement......very delicate work there, spend all the time you can to get them to lift exactly at the same time, then check again!! Synchronizing should be one of the first things you do when tuning...IMO of course! :-D

GrandPaulZ · 04-11-2006

Likely 1-1/2 turns out (typical setting on low speed mixture screws) would be a tad too rich, as suggested, but you need to twiddle those with the bike idling till it stumbles, then back off.

Definitely spot-on advice about static carb sync, you want both slides exactly the same, adjust the cable at the top of the carb or at the in-line cable adjusters, till equal.

johnnypence · 04-12-2006

OFF - TOPIC WARNING

kawtoy, do you have pix of your cb350s? love to see them. a couple years ago i bought a 350-4 for $5 at an "abandoned vehicle auction" held by the police dept.

i treated it as my cadaver -- dissected it w/ manual in hand. it was really fun. i always dreamed about a tiny, quiet streetfighter that wouldn't pull a hen off her nest, but my wife and i moved before i could get very far with it, and i just gave the basket case to the family down the street. two teenage boys -- they loved it. you can e-mail me off-list if you want -- ediot at blotterrag.com -- or post for the whole gang.

texspeed · 04-12-2006

I started out setting mine (air screws) by the book when I first got mine (79 Bonnie Special-2 1/2 turns) but on cool mornings I would get popping, snorting, back firing...all sorts of crappy running. After it was warm it would go away. I tore apart carbs, changed to hotter plugs, all sorts of things.....took me awhile to figure out that 2 1/2 turns out was way too lean....started going richer until the problem went away completely no matter the temps. Ended up being about 2 turns out from seated. Ran great then....Every bike will be different off course...I just remember adhereing to the recommended settings at the beginning of ownership before realizing how much the air screws actually affected running.

Quote:

On 2006-04-11 21:05, GrandPaulZ wrote:
Likely 1-1/2 turns out (typical setting on low speed mixture screws) would be a tad too rich, as suggested, but you need to twiddle those with the bike idling till it stumbles, then back off.

Definitely spot-on advice about static carb sync, you want both slides exactly the same, adjust the cable at the top of the carb or at the in-line cable adjusters, till equal.

:-D