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turning air screw

  • Thread starter Thread starter goggleboy
  • Start date Start date
Some carbs don't show much difference in the air adjust. Once you get it properly synchronized, and in the ball park some of the carbs might not show more than a half or whole needle width in adjustment on the tach, but can make a huge difference in idle, power engaging the clutch and low speed manners (25 to 30MPH without any surging). You might want to invest in tubing for your overflows. Floats will stick and the results on a hot motor and exhaust might be less than pleasing. I believe the Morgan is the overall best manometer.
 
Did you inherit this problem or did it run fine before your work? A 750 that won't rev past 6K or go beyond 80 mph?
Before blaming the carbs...
Do you have good compression at all cylinders?
Is the gearing (front/rear sprockets) stock or close to?
Are the throttle slides opening all the way (by actually operating the throttle housing)?
Since full advance timing kicks in about 2K and you saw the timing move I doubt the timing is causing a problem at 6K.
Any chance you did something to lessen air flow when you "weather sealed" the airbox? Are the factory installed airbox holes clear?
Are you sure there are no leaking intake issues?
Is your air filter a dry filter or does it require oiling?
Are the floatbowl vent lines and vacuum line connected correctly and not kinked and open to breathe?
Is the petcock flowing well? If you test for top speed with the petcock in PRIME, any change?
Any fuel filter being used?
If all above are OK then look at the carbs. Are you POSITIVE the carbs are the correct ones (VM26MM)? Is the jetting stock? What size mains? Do you know what position the jet needle e-clips are in?
 
And yes, the vacuum synch is important. However, any decent bench synch will still allow the bike to reach near top speed and much higher rev's than 6K. With generally poor/uneven vacuum the bike will not run as smooth or perform its best but if the slides were so uneven that it caused a top speed/rpm issue as you describe the bike wouldn't even start.
Another question I forgot to ask in my previous post...will the bike rev beyond 6K in neutral?
 
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