Author Topic: clear tube fuel level test  (Read 4653 times)

0 Members and 1 Guest are viewing this topic.

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,301
Re: clear tube fuel level test
« Reply #25 on: June 14, 2015, 06:56:21 AM »
Wait a second....I just reread one of your last posts.
Are you running this bike without the airbox on?

...possible that it just wont run without airbox in place?....
supposedly testing and tuning your carbs to your intake and exhaust setup  :o

Doood....you've got to do your tests on this bike with EVERY component of the intake and exhaust system in place, EVERY time!
« Last Edit: June 14, 2015, 07:14:01 AM by flybox1 »
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline screemn2

  • Enthusiast
  • **
  • Posts: 126
Re: clear tube fuel level test
« Reply #26 on: June 14, 2015, 07:47:30 AM »
the engine sounds great while running ....only can touch throttle while fluttering choke ..can get as high as maybe 4500rpm...let off choke and it dies ...id have to have six hands to do the vacuum adjustment at this point ...lol....little bit of popping through the carbs...very minimal....do i really need to just throw some huge jets in it err what ?...im clueless at this point wish i had all the parts for the airbox..but dont ....i cant believe that everyone can get these things running and i can not ...feel pretty dumb at this point.. all gaskets are new intake and boots from intake to carb as well...so there is no vacuum leaks...this is amazing ...exhaust is on 4 to 1 mac ...and uni pods are on and oiled ...
« Last Edit: June 14, 2015, 07:49:40 AM by screemn2 »

Offline calj737

  • Really Old Timer ...
  • *******
  • Posts: 21,100
  • I refuse...
Re: clear tube fuel level test
« Reply #27 on: June 14, 2015, 07:49:14 AM »
...so there is no vacuum leaks...
And you verified this how?
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline screemn2

  • Enthusiast
  • **
  • Posts: 126
Re: clear tube fuel level test
« Reply #28 on: June 14, 2015, 07:50:37 AM »
used propane to check for vac leaks...not messy

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,301
Re: clear tube fuel level test
« Reply #29 on: June 14, 2015, 07:54:20 AM »
Can you get it to idle at 1500 with no choke?
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline screemn2

  • Enthusiast
  • **
  • Posts: 126
Re: clear tube fuel level test
« Reply #30 on: June 14, 2015, 08:01:03 AM »
no ..will not run for more than a couple secs with out choke on

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,301
Re: clear tube fuel level test
« Reply #31 on: June 14, 2015, 08:02:10 AM »
And do you have your idle set screw engaged?
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline screemn2

  • Enthusiast
  • **
  • Posts: 126
Re: clear tube fuel level test
« Reply #32 on: June 14, 2015, 08:07:01 AM »
yes idle screw is engaged...but no matter how much throttle you give it choke needs to be nearly closed ...at this point im still just trying to get it to stay running under normal circumstances ...not happening yet ...so there really isnt any tuning goin on yet ... :-[
« Last Edit: June 14, 2015, 08:09:17 AM by screemn2 »

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,301
Re: clear tube fuel level test
« Reply #33 on: June 14, 2015, 08:08:23 AM »
Ok...when you say closed....do you mean the 'choke butterflies' are closed, or your choke is in the 'closed' position

Take off one of your pods and see how the choke lever operation relates to the butterfly position.
« Last Edit: June 14, 2015, 08:10:12 AM by flybox1 »
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline screemn2

  • Enthusiast
  • **
  • Posts: 126
Re: clear tube fuel level test
« Reply #34 on: June 14, 2015, 08:09:59 AM »
yes closed ... blocking off all the air position...thanks for trying to help me

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,301
Re: clear tube fuel level test
« Reply #35 on: June 14, 2015, 08:11:07 AM »
Take.off a pod and verify this.
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline screemn2

  • Enthusiast
  • **
  • Posts: 126
Re: clear tube fuel level test
« Reply #36 on: June 14, 2015, 08:14:19 AM »
it has been verified for sure ....butterflies closing all air coming in to stay running ....i am 100pct positive ...just put the carbs back on from off the benchi pretty much now every square inch of thosse things by now ..lol...lots of things getting me nowhrere.. :-\
« Last Edit: June 14, 2015, 08:17:05 AM by screemn2 »

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,301
Re: clear tube fuel level test
« Reply #37 on: June 14, 2015, 08:18:10 AM »
Can you post a video of your start up procedure and the things you have to do in order to get it to stay running?
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,301
Re: clear tube fuel level test
« Reply #38 on: June 14, 2015, 08:22:29 AM »
Are you still running stock pilot jets?  42's?
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline screemn2

  • Enthusiast
  • **
  • Posts: 126
Re: clear tube fuel level test
« Reply #39 on: June 14, 2015, 08:23:30 AM »
i can try ...key on ..full choke ....and starts first kick and stays running as long as i hold choke closed errr nearly closed ...yes stock pilots 42 and main 105 ....needle stock position....ive tried idle screw at 1.5 and 2.5 ...not much change...is it possible that it could be somthing electrical that i havnt checked ?
« Last Edit: June 14, 2015, 08:27:53 AM by screemn2 »

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,301
Re: clear tube fuel level test
« Reply #40 on: June 14, 2015, 08:32:45 AM »
Your pilots are too small for the air supplied by your pods...go to your stock airbox or larger pilot jets.
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline screemn2

  • Enthusiast
  • **
  • Posts: 126
Re: clear tube fuel level test
« Reply #41 on: June 14, 2015, 08:38:45 AM »
What size pilot should i put in?...how do those come out?..they look pressed in?....how is it that others are able to keep the stock ones with the same set up?

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,301
Re: clear tube fuel level test
« Reply #42 on: June 14, 2015, 08:43:56 AM »
Ok.
The fact that you don't know how they come out shows me you have not thoroughly cleaned them.
 :-\
You can't make adjustments on carbs that you know need cleaning.
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline calj737

  • Really Old Timer ...
  • *******
  • Posts: 21,100
  • I refuse...
Re: clear tube fuel level test
« Reply #43 on: June 14, 2015, 08:45:01 AM »
Bingo!
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline screemn2

  • Enthusiast
  • **
  • Posts: 126
Re: clear tube fuel level test
« Reply #44 on: June 14, 2015, 08:47:38 AM »
Ran carb clean and e string through all ...over and over again to make sure all passeges were clear

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,301
Re: clear tube fuel level test
« Reply #45 on: June 14, 2015, 08:52:51 AM »
You're assuming a little wire cleaned them ? :o
You need to pull out a pilot jet to see how it works.
You'll see how your 'poker' can't clean the it's side holes if they are corroded closed.

'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline screemn2

  • Enthusiast
  • **
  • Posts: 126
Re: clear tube fuel level test
« Reply #46 on: June 14, 2015, 08:55:15 AM »
Well..lol..ok then ...so how do they come out...gonna move onto that now :-\

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,301
Re: clear tube fuel level test
« Reply #47 on: June 14, 2015, 09:00:19 AM »
They are pull out.  Pull straight out with a gentle twist.
Remove your main jets and emulsion tubes as well.

Dirty and clean.  Use some 0000 steel wool.  Carb cleaner spray them clean.
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline screemn2

  • Enthusiast
  • **
  • Posts: 126
Re: clear tube fuel level test
« Reply #48 on: June 14, 2015, 09:07:04 AM »
Im so excited...didnt know they looked like that...prolly just dirty huh....ohhhhh i hope so

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,301
Re: clear tube fuel level test
« Reply #49 on: June 14, 2015, 09:09:45 AM »
Those are the pilot jets...these are the main jets mounted to the emulsion tubes.

In the time it took me to post these pictures....I cleaned these.  They all came out of the same bag of spares...
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"