Not Smooth at Low RPM's

[Stick]

About a week ago, it started to backfire and not run smooth at low RPM's. When the throttle is twisted, it runs GREAT. I replaced the plugs, and washed the air cleaners, without change. Then I replaced the high dollar fuel filter (in the gas tank), put it back together, ran it for a couple minutes and went to bed. Started up in the morning, then with a big backfire, it stopped running and wouldn't restart. I called the local service dept. to see if there was a special bleeding sequence as I know it got air in it changing the filter, but he said turn it over, and it should bleed out. It hasn't, and ended up putting the battery charger on it. Has anyone had a similar experience? Driving my truck sucks! Thanx Stick

 

[warp9.9]

Stick check your vaccuum lines see if any are off or damaged. Also on each of the throttle bodies there is a vaccuum plug to block extr vavumm ports and two on the rear one. I remember Triumph telling me to check them as they get cracked and leak and sometimes come off they will make her run all kinds of screwed up. easy check if you have triple filters a little more workif you don't but worth checking.

 

[Gothlander]

Thats what happened when my TPS went bad.

 

[Stick]

Found the problem!

Installed NGK #DPR8EA9 plugs as were called out in the Owners Handbook. Found the new plugs were black and fouled. Put the old plugs back in "DPR7EA9" and it ran. I bought new "7's", a hotter plug and life is good. Bought the bike new, never changed the plugs, but the bike had "7's" and the book called for "8's". Now I'm good for another 50,000 miles. WTF?

 

[minderaser]

That happened to me before (Backfire) I twisted the the throttle when starting and it backfired like a shot gun. Rode it home drove horrible backfiring and losing power.

when I checked it out I ended up blowing off two of the three Large vac hoses under the claw. Had to get my hand in there and loosen the lower clamps and push up and they both popped back on.

Ran like a champ afterwards. When the bike is running put your ear by the claw and listen as you turn the throttle. If the hoses are off you will hear a loud sucking noise.