Announcement
Collapse
No announcement yet.
78 750 to 850cc Vintage Street / Track theme build
Collapse
X
-
Gs1000g
Originally posted by one_civic View Post
-
Originally posted by Gs1000g View PostHey man great build, can I ask why you just didn't go with the 850 carbs or even 1000cc carbs if you need increased fuel demands and jet accordingly?
I don't believe those are smoothbores, but they appear to be direct linkage non-CV flatsludes, which isn't the most common setup to find here in the US. non-CV's are best for all out performance but require a well versed rider's appropriate throttle input to keep the velocity and engine e response in it's peak efficiemcy/power sweet spot. CV carbs have butterfly valves that restrict the middle of the venturi, and then a airflow sensitive spring loaded slide that moves up on its own based on airflow velocity and pressure differential. With the manual slide carbs, the venturi is unobstructed and the rider is left to have 100% control of slide position.
When whacking throttle wide open on a CV, you open the butterflies fully, but they are still blocking through throat in the middle, and the slide is left to open at its own rate based on airflow, air port size and engine vacuum, and spring tension. On a direct linkage carb, you can open the throttle and monitor engine sound and power output and optimize it yourself. Too much opening of the directly attached carb slide will kill your velocity and lead to poor performance until the engine catches up or you back off to its sweet spot.
More user input required but with that the ultimate performance can be gained. Constant engine feedback and rider wrist input is required though.Last edited by Chuck78; 02-19-2016, 04:02 PM.'77 GS750 920cc heavily modded
'97 Kawasaki KDX220R rugged terrain ripper!
'99 Kawasaki KDX220R rebuild in progress
'79 GS425 stock
PROJECTS:
'77 Suzuki PE250 woods racer
'77 GS550 740cc major mods
'77 GS400 489cc racer build
'76 Rickman CR1000 GS1000/1100
'78 GS1000C/1100
Comment
-
one_civic
Originally posted by Chuck78 View PostI assume for the same reasons Suzuki didn't continue to use BS32 carbs in the mid to late 1980's, flats lies are better for performance.
I don't believe those are smoothbores, but they appear to be direct linkage non-CV flatsludes, which isn't the most common setup to find here in the US. non-CV's are best for all out performance but require a well versed rider's appropriate throttle input to keep the velocity and engine e response in it's peak efficiemcy/power sweet spot. CV carbs have butterfly valves that restrict the middle of the venturi, and then a airflow sensitive spring loaded slide that moves up on its own based on airflow velocity and pressure differential. With the manual slide carbs, the venturi is unobstructed and the rider is left to have 100% control of slide position.
When whacking throttle wide open on a CV, you open the butterflies fully, but they are still blocking through throat in the middle, and the slide is left to open at its own rate based on airflow, air port size and engine vacuum, and spring tension. On a direct linkage carb, you can open the throttle and monitor engine sound and power output and optimize it yourself. Too much opening of the directly attached carb slide will kill your velocity and lead to poor performance until the engine catches up or you back off to its sweet spot.
More user input required but with that the ultimate performance can be gained. Constant engine feedback and rider wrist input is required though.
Couldn't have said it any better Chuck, their easier to tune with pods as opposed to CV as well.
Comment
-
The creativity and skills by the members here never ceases to amaze me. This is a great build and documentation. Thanks.Current Rides: 82 GS1100E, 00 Triumph 955 Speed Triple, 03 Kawasaki ZRX1200, 01 Honda GL1800, '15 Kawasaki 1000 Versys
Past Rides: 72 Honda SL-125, Kawasaki KE-175, 77 GS750 with total yosh stage 1 kit, 79 GS1000s, 80 GS1000S, 82 GS750e,82 GS1000S, 84 VF500f, 86 FZR600, 95 Triumph Sprint 900,96 Triumph Sprint, 97 Triumph Sprint, 01 Kawasaki ZRX1200, 07 Triumph Tiger 1050, 01 Yam YFZ250F
Work in progress: 78 GS1000, unknown year GS1100ES
Comment
-
one_civic
-
one_civic
Quick mock up with zip ties,I'll have them mounted before the end of the week,
Going to make sure that I can still use the kickstarter
Comment
-
one_civic
Rear sets done, will have to get a shorter female shift rod in the future but for now their perfect, cutting down my seat foam and getting it re-done to help ergonomics
Comment
-
one_civic
I needed a manual cam chain tensioner and the only one available is around $140 can. through SPS. So, I decided to fabricate my own with the help of my machinist, here are some pics, It is basically a ground down automatic tensioner with a 7/16 fine threaded rod with a silver soldered nut machined down exactly identical to the OEM one,
It also has an E5 female Torx stud tapped / locktited and peened over at the end of the threaded rod for adjustment and carb clearance. I could not find a bolt long enough / threaded all the way to the end and my machinist did not recommend to tap one .
Last edited by Guest; 03-01-2016, 09:12 PM.
Comment
-
one_civic
-
one_civic
-
Link no work1978 Gs1085 compliments of Popy Yosh, Bandit 1200 wheels and front end, VM33 Smoothbores, Yosh exhaust, braced frame, ported polished head
1983 Gs1100ESD, rebuild finished! Body paintwork happening winter 2017
I would rather trust my bike to a technician that reads the service manual than some backyardigan that THINKS HE KNOWS how to fix things.
Comment
-
one_civic
Last edited by Guest; 04-10-2016, 08:15 PM.
Comment
Comment