andrewlc77

if i wot through the gears it is fine but when cruising at about 2000 to 3800 i get a clunk spit pfft. is this a sync issue?

hawxter996

try shimming your carb needles.
i used a dynojet kit and cured all my driveability problems using stock air filter of course.

omniouslink

can you give a little more detailed description?

andrewlc77

whenever cruising at a constant rpm i get backfires through the carbs....i think mainly the front one

omniouslink

First off try your spark plugs. Replace them with some good ones like NGK or better. DO NOT USE AUTOLIGHTS (damn advanced auto people). Do you have any Jet work or exahust work done? if so that could be the issue. Are you sure its only the front? This could be your coils fading out or your CDI acting up. How many miles are on your bike? Have you had other related problems? and also have you or anyone else worked on the bike recently? Did this problem just pop out of no where or did it start really slow?

SillyHawk

are your carbs jetted or not...i had the same problem by having an aftermarket pipe and NOT jetting them. went through that **** for a few months then jetted...NICE!

andrewlc77

ya i just put the jardine rt-1 aluminum high mounts on so maybe that is the case....thanks

Hawkrider

Mixture screws to 2 turns out. 1 size up on mains. Shim needles 0.040-0.060". This is a poor man's jet kit for the VTR. Otherwise buy the Factory kit and use my settings on my site as a baseline, except one size smaller mains than what I have because I have the K&N.

Oh, and don't forget the carb sync!!!!

andrewlc77

ok i took off the tank and there are no screws in the airbox cover...could this be my problem???

omniouslink

I doubt that seriously. the tank shoud hold the cover down for the most part. But hey try it who knows. put some screws in it and take it around the block! If it dosent fix it you havent lost anything.

hawxter996

it could very well cause problems. with the intake pulses causing it to flutter around and breaking airbox seal letting in unfiltered air.