bike running bad intermittently

[reggie310]

my vtr 1000 98 model runs fine but every now &then it is like its running on 1 cyl,i can stop at lights for approx 3-5 mins,then when i take off it wont go right,feels like it could be flooding because if i crank throttle it starts to clear out but takes bout 30 seconds etc also can be cruising along in third,come to a crest,back off,back to 2nd,accelerate again&it does same thing,i crank throttle &it coughs&backfires for about 1 min,if i pull clutch in it clears a bit quicker,this can happen anytime,warm or cold after easy riding or hard riding,plugs have just been replaced,HELP!

[kevg]

are the hoses on the bottom of the fuel tank in the correct places? seems to cause a few probs if they aren't

[Captain Shapeless]

Was it doing this before you replaced the plugs ?

And did you check the gaps on the plugs when you put them in?

It sounds like a very similar problem I had - it was down to the plugs being knackered.

[reggie310]

thanks for the replies but got it sorted,i had tank off &was a vacuum tube on wrong side of fuel tap,was only getting fuel thru under acceleration when there was crankcase pressure not when there was vacuum.