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Brent, I know it's supposed to be 20in. Sorry if I made it sound like you were wrong. The only thing I have never checked is valve timing. But if valve timing is off that bad wouldn't I have lower compression (175psi)? 39 MPG. It seems to run great. I say "seems" because I have never had it on a dyno or road with another 11.
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79 F full cruiser, stainless brake lines, spade fuses, Accel coils, modded air box w/larger velocity stacks, 750 FD.
79 SF parts bike. -
No apology needed, as I already knew my statement was correct. To add, that vacuum at sea level is normally 22in.vac. and at 10-12,000ft. elev. it drops to 16in. vac. I just know this from using a mas-port vacuum pump at a variety of elevations, which was work related at the time
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81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top. -
Also, those variations of vacuum based on elevations is why these vacuum slide/metering rod operated carbs are altitude compensating to a certain extent......less vacuum equals less rise of slides/metering rods that push up against vacuum slide sring assembly, which in turn equals less fuel/air as elevations rise.
Last edited by motoman; 09-04-2017, 04:20 PM.81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.Comment
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