yyz

i am still fighting with mine... reset float heights but noticed the float assembly from the right carb was slightly twisted whereas on that assembly, one of the two floats was higher than the other... so after straightening it, i put that assembly in the left carb, and the left's in the right, now both carbs leak a little from the overflow drain... wtf! but, neither cylinder is leaning and the plugs are both even... fuck if i know... i think i am going to tear them both down, ultrasound the carbs and parts, weigh the floats against each other with a gram scale (to check for saturation), then order new floats if necessary... in the meantime, i am going to borrow carbs from my other bike. 00tbanshee, not sure what to tell you... did you check and clean the choke circuit and did you make sure the choke hose between the two carbs is good? maybe try switching floats left to right to see if the problem follows the float. keep me posted 'k yyz

well that is probably true to a degree... more mods yes, but what mods?... bigger carbs?... in that case, my big jets would be a mute point (these are stock carbs)... a stroker?... strokers usually require slightly leaner jetting given all else is equal (they generally pull more fuel through the same size hole as a non-stroker)... more compression on straight race gas?... should be loading the cylinders hard in that case. they do make jets for the vm series all the way up to 720... in super stock nhra drag racing the class allows for any valve train and intake, but stock carb(s) are required with any jetting desirable... point is on stock carbs with big camming (porting in this case)... fat is good. like i said, last year my mid-port dynoed at 65 hp in little sahara, ok. on pump fuel with 340 mains... 65.01 to be exact and this was in september... little sahara is about 1000 ft.... i generally do run slightly on the rich side, but then i also get at least two seasons out of my top ends as well... still has 128psi both cylinders, had 130 april '05 after break-in and i raced the shit out of that bike last year... some weekends at least 100 or more runs on the sand. one might think too that maybe i would have an air leak if i am having to jet so rich, but both plugs are evenly colored, coffee creamer brown with a tinge of dark brown... just right for break-in... will more than likely drop back to a 390 or 400 after that. it's all good... not trying to argue, just trying to fix my carb issue. yyz

ok... setup a different set of carbs the same (with 410's)... now all is good... was a damn windy day here, about 55 degrees... no plastics on the bike... good thing i had the 410's... i wouldn't want to be much leaner. still don't know what is wrong with the other carb... might just need an ultrasound. any suggestions??? (other than telling me my jets are too big) yyz

pull the clutch and basket back off, put the tranny in 2nd or 3rd gear... or 4th gear... any gear except 1st or neutral... with the jam nut loose, turn the adjuster rod with a flat head one way or the other until there is an equal distance between the top and bottom arms that grab the shift star... check and re-check to make sure they are equal... then without moving the adjuster shaft, tighten the jam nut then bend over the lock tab... put everything back together... if the adjustment is tight on the top, it will favor downshifting, tight on the bottom will favor upshifting... if it is not even, you probably will have trouble getting into neutral... when even, it should shift great... also, while you are at it, check for any worn areas on the adjuster pin, shift star, etc. then replace as necessary. good luck, yyz

yeah... that's true... the left side is fine with it's 410, just the right has the problem... once broke in, i will go down to a 390 or 400, the needle will stay where it is at... last year i ran my mid-port all season with the same exact setup only with 340 mains... made 65hp on pump fuel with t5's at little sahara, ok. my engine builder's porting is very good... this drag port is loading the cylinders hard... reminds me of nhra super stockers... lots of cam with fat carburation. we found it odd too that a 25 pilot was working... on the 4mil drag port we also just had done, we had to go to a 27.5 pilot... right now it is nearly broke in and it has 390 mains, same needle 5th clip, cpi inframes, rk tech head w/ stroker domes, vforce3's, same fuel and mix as this one... it screams. i will keep researching... thanx... yyz

piston speed is faster across the transfers with a 4mil... my engine builder told me that it is critical to make sure they are resized vertically to allow for more duration otherwise the gains are minimal... we just had a 4mil drag port done... just finishing up break-in and so far it screams yyz

hey all, am having problems on my right carb... the carb bowl overfills and fuel will bubble slightly out of the overflow drain but not drain completely, then the cylinder loses fire but only at rpm's just under the powerband... the carb acts like it is air locked because it doesn't seem to drain on it's own and it acts like it isn't pulling fuel from that main jet... jets are not clogged, switched floats, needles and seats left to right, bowls are correct left/right, same thing... right side carb overfills... have to pull over into neutral and rev to clean out the excess fuel... it just starting doing this on a new build... ran these same carbs all last year on my mid-port with no problems. running 410 main jets (fat for break-in), toomey needles 5th clip, 25 pilots 1 1/2 out, vforce2 reeds, k&n clamp-ons, full drag port with boosts, cpi inframes, noss head 19cc domes, .020 over pro-lites, trued/welded crank, stock timing, 50/50 citgo 110/amoco 91 w/32:1 Super M, 150psi both cylinders at 2400ft. any suggestions?... i pulled my other carbs from my mid-port and re-jetted and will try that tomorrow... i am thinking i might have a plugged circuit (choke circuit maybe) in the carb itself. thanx, yyz