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Author Topic: Always turn the gas off  (Read 2092 times)

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Offline 754

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Re: Always turn the gas off
« Reply #25 on: October 08, 2015, 11:06:20 AM »
Did you clean the points with paper..?
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Maker of the WELDLESS 750 Frame Kit
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Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline eoddom

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Re: Always turn the gas off
« Reply #26 on: October 08, 2015, 11:12:52 AM »
No.  With paper?  Why?
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Offline flybox1

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Re: Always turn the gas off
« Reply #27 on: October 08, 2015, 11:13:40 AM »
Air. Fuel. Spark....it has to be one of the three.

You've already chosen to NOT source an air box and to run the bike without pods or anything on the intakes (This makes your air/fuel ratio LEAN) just to see if you can get it to run...
You haven't adjusted carbs from stock jetting to compensate for the leanness, so your air/fuel ratio is way off.

...and still you wonder why your bike wont run on all cylinders.  ::)

Members here will not continue to assist when you 'wing it' after appropriate suggestions are made.

Sorry, man.  I'm out.




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'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 eoddom

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Re: Always turn the gas off
« Reply #28 on: October 08, 2015, 11:22:49 AM »
Quote from: flybox1 on October 08, 2015, 11:13:40 AM
Air. Fuel. Spark....it has to be one of the three.

You've already chosen to NOT source an air box and to run the bike without pods or anything on the intakes (This makes your air/fuel ratio LEAN) just to see if you can get it to run...
You haven't adjusted carbs from stock jetting to compensate for the leanness, so your air/fuel ratio is way off.

...and still you wonder why your bike wont run on all cylinders.  ::)

Members here will not continue to assist when you 'wing it' after appropriate suggestions are made.

Sorry, man.  I'm out.

Understood man.  I just assumed if I had a fue/air issue, I'd be having issues on all 4, not just 1 set of cylinders that happen to be on the same set of points/coil.  I understand with it running so lean, it will run like crap.  I'm trying to source the top of an airbox if I can, but until I can do so, I'm just working with what I have.  I'll continue to read the forums and work in silence until I'm at a point where its appropriate to ask questions again.
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Offline dscri001

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Re: Always turn the gas off
« Reply #29 on: October 08, 2015, 11:38:00 AM »
I think if 1 and 4 are firing wouldn't that indicate coils and points are ok? Each coil fires 1/3 and 2/4. If points or coils would bad then a combination of those wouldn't fire? I would look into carbs and plug boots as stated before. 1 and 4 could have proper a/f but 2 and 3 might not. Maybe try finding just the airbox chamber and boots? Thats all I have + a coupling going to a cone filter and I'm hoping it'll suffice for stock jets.
« Last Edit: October 08, 2015, 11:39:58 AM by dscri001 »
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Offline flybox1

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Re: Always turn the gas off
« Reply #30 on: October 08, 2015, 11:39:52 AM »
Quote from: dscri001 on October 08, 2015, 11:38:00 AM
I think if 1 and 4 are firing wouldn't that indicate coils and points are ok? Each coil fires 1/3 and 2/4.
No!
Coils fire 1/4  &  2/3
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'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 dscri001

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Re: Always turn the gas off
« Reply #31 on: October 08, 2015, 11:40:42 AM »
Quote from: flybox1 on October 08, 2015, 11:39:52 AM
Quote from: dscri001 on October 08, 2015, 11:38:00 AM
I think if 1 and 4 are firing wouldn't that indicate coils and points are ok? Each coil fires 1/3 and 2/4.
No!
Coils fire 1/4  &  2/3

Haha oops! Brain fart of the day. Sorry about that! Carry on!
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Offline eoddom

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Re: Always turn the gas off
« Reply #32 on: October 08, 2015, 11:43:26 AM »
I have the part that connects to the carbs and the airbox that sits under the seat.  I don't have a top for that box or anything that goes in it.  Just posted a WTB ad to see if I can source what I'm missing and will go from there.
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Offline flybox1

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Re: Always turn the gas off
« Reply #33 on: October 08, 2015, 12:04:28 PM »
« Last Edit: October 08, 2015, 12:06:09 PM by flybox1 »
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'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 eoddom

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Re: Always turn the gas off
« Reply #34 on: October 08, 2015, 12:28:22 PM »
The first one in that list is what I'd need.
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Offline Stev-o

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Re: Always turn the gas off
« Reply #35 on: October 08, 2015, 04:51:10 PM »
Quote from: eoddom on October 08, 2015, 09:48:11 AM
Quote from: flybox1 on October 08, 2015, 09:46:08 AM
coils rarely go bad, but plugs caps do...

 I need to track down an 18mm thin walled socket

Here...

http://www.ebay.com/itm/HONDA-CB350F-CB400F-CB500-CB550-CB750-GL1000-SPARK-PLUG-WRENCH-OEM-NEW-18-/231663986176?hash=item35f03fe600&vxp=mtr

We are very good at helping you spend money [and sometimes  save it]
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........
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