<font size="2" face="Verdana, Arial">I'd also suspect that the extra mm's on the carbs doesn't matter much with the stock exhaust in place... gotta move more air outta da motor to move more in.Originally posted by Wolf1100L:
Thanks guys...and Happy Birthday Bones.
Can you tell me how long these CV carbs last? There must be a lot of wear on these slides because they are moving up and down about 5000 times per minute and all this without any lubrication.
I read the post "desperately seeking flatslides" and learned there that 36mm flatslides are equivalent to 38mm CVs. That makes me wonder why the 1127s equiped with 40mm CVs are not more powerful than the ones with 36mm CVs, according to "Performance Bike" magazine.
<font size="2" face="Verdana, Arial">That's kinda true re: the CV's... They are not directly tied to the throttle cable, but they do cycle up and down quite a bit... at WOT the slides are stuck wide open... but from just off-idle through intermediate RPM's and throttle-position, the slides actually rise and fall a fair amount with each pulse of intake-charge that flows through them. They open more and close less with rising RPM's/throttle-opening, and no, they do not cycle fully-closed to fully-open with each intake stroke, but they definitely hop up and down a lot, not like the smoothbores/flatslides at all. That's the big reason why the emulsion-tubes and slides get worn-out and sloppy.Originally posted by 341:
The slides aren't moving up and down 5000 times/min. On a CV carb when you open the throttle the slides move up, but how quickly and how much is dependent on the airflow through the carb. Open the throttle, it opens a butterfly and lets more air in. The increased airflow draws more fuel in, the engine rpms rise drawing more air and fuel in. As the revs increase drawing more air in, the slides continue to rise, letting more air and fuel in and so on. The slides rise and fall smoothly with the throttle but aren't tied directly to the throttle cable like flatslides. A flatslide carb can be opened fully at low rpms and the engine can bog because there is a big hole and the engine isn't flowing enough air to draw the fuel in, even with accelerator pumps. Flatslides make bigger hp but need a smooth hand at low revs.
<font size="2" face="Verdana, Arial">No lube... I think fuel tends to kinda lube em while in use... it would definitely wipe out any kinda grease I put in there. I *did* put new slides in though, along with the emulsion tubes. The slides are ~$35 ea. and emulsion tubes are ~$12 ea from Ron Ayers if I remember correctly. New slides do not include the diaphragm.Originally posted by davenay67:
First, Happy Birthday....have a good one..!!
Second, I know you just rebuilt your CV's recently. Did you use any kind of lubrication on the slides, or just cleam them up and let them run plastic on plastic..??