Originally Posted by
teamreidy
ok question got to go 5 port gen 5.5 1 has long lsn ( stays in at full open) the other i think has a short lsn ( comes all the way out at full open ) now the long lsn motor runs and tunes great no issues now the one with the short lsn is harder to tune it seems the pinch test is inconsistent can run 3 or 4 laps check it and its fine then after another 3 to 4 laps it is too lean the motor as a ton of power but the od thing is when it idles it is fine but if it flips over it flames almost sounds like it loads up and dies any ideas on what this could be thanks.
Your tank level will have dropped considerably after another 3 - 4 laps, so everything will be a little leaner I would expect. I would'nt think it would load up when it's upside down, as the fuel pick up would be uncovered. The length of the LSN shouldn't matter too much, as long as you have tuned each type of needle appropriately. Either motor should run the same. Have you got the fuel tubing routed differently ? Check your fuel system out thoroughly. Look for fuel tubing pin holes, needle O rings leaking, leaking fuel tank or faulty tank lid O ring or spring. Funny little changes in the way an engine runs like that are quite often not a tuning problem, but something outside the motor.