Author Topic: Going to Kill my Carbs............... (Read 2050 times)

Jughead · « **on:** December 28, 2005, 08:31:30 PM »

OK I've spent the Past Month Cleaning my Carbs.This last time I took them off of the rack and soaked them 2-3 days each in Berryman's Chem Dip.As I took them out I blew thru every Nook and Cranny with Spray Carb Cleaner then Blew them out with an air Compressor.I finally got a chance to completely reassemble them the other Night and Installed them Yesterday.When I try starting it it won't Fire on the Choke unless I have the Throttle Cracked 1/4 Turn then it Screams to life WFO to at least 5-6 Grand.

Turn the Choke off and it dies and doesn't even Grunt.It is getting fire on all 4 Cylinders.It runs really nice when I puff a little ether in the Carbs and all 4 Pipes are getting Warm.

I don't know whether to Kill them really fast with a 20lb Sledge or give them a Slow Death Tied behind my truck at 55 MPH.

mutters · « **Reply #1 on:** December 28, 2005, 11:58:21 PM »

Juggy,that sounds a lot like blocked pilot jet /system to me .And if it is ,well, you're not gunna enjoy it,mate

Terry in Australia · « **Reply #2 on:** December 29, 2005, 12:55:10 AM »

I'm with Mutty, (well, not in the biblical sense, ha ha!

) we're talking about your F2 Juggy? Carefully pull the pilots out with vice-grips (they're not threaded, so just pull them out) and hold each one up to the light, you should be able to see a pin prick of light.

You probably won't, because even carb cleaner, soaker, dip, blah blah, won't move it, it needs mechanical force!

Now there's not much small enough to poke up there, someone suggested a strand of wire from a wire brush, one from a brass or copper wire brush would be safer than say, stainless steel, but any ol' port in a storm, ha ha!

Anyway, once you've poked everything outta those tiny orifices, blow some compressed air through the whole slow circuit, followed by some carb spray, followed by more blowing, then put your pilots back in, and put your carbs back together.

Before you start it, remove your petcock, flush any rust and crap outta your tank, fit a new fuel line with an in line filter, and fire that sucker right up mate! Cheers, Terry.

Bob Wessner · « **Reply #3 on:** December 29, 2005, 02:40:16 AM »

Jughead,

I'll let you borrow my sign

. I feel your pain, honest. Do as Terry suggests. You will likely become even more acquainted with your carbs than you are already. Personally, I think it's a right of passage or something. Had mine on and off so often it wasn't funny. You'll get them sorted out eventually.

74cb750 · « **Reply #4 on:** December 29, 2005, 04:54:15 AM »

Nice sign Bob,
OR you could use the sledge hammer, then go to Honda with $1,000+ and buy a complete new set.
Delievery time is usually one weeek less than the riding season left in the year.

THis is a rite of passage. Must be, as I had the same problems with all of my cb750's.

Be sure to not use stainless steel "rod" to clean 'em out.
peace

ditchen · « **Reply #5 on:** December 29, 2005, 07:03:09 AM »

I am with the above,

After I spent a bunch of hrs going through mine (1 looked like something dead in it). I had to go through every jet and passages with a very fine wire and eventually cleaned. Do not over look the bleed holes on the side of the jets. Well I go to fire it for the first time without the airbox and it was a very lean condition and ran like crap with simaler results. I put the airbox on and wha la, purred like a kitten. Well a kitten that has been sitting for 23yrs with bad points and plugs anyways.

It sounds like you were test firing without the airbox if you were spraying the ether in the carbs. If not jetted for it it will be very lean without the box and filter. Unless you had them jetted for pod filters right off the carb.

eldar · « **Reply #6 on:** December 29, 2005, 07:52:40 AM »

If you desire, you can go to a motorcycle shop and pick up a set of carb cleaners. They are just wires on a rod that fit a number of different jets. I got an actual honda one and while somewhat expensive, works very well and I do nothave to worry about a copper strand getting kinked up in the jet.

Jughead · « **Reply #7 on:** December 29, 2005, 08:10:23 AM »

Thanks Guys.I'll pull the Carbs Again.

Actually I'm getting good at it I can Have them off in less than 5 min. and back on and ready to start in less than 5 Min.I have a set of Torch Cleaners in the Barn I'll see if I can find one small enough to fit the Jets.I'm off to the Auto Parts to buy another set of Vice Grips anyway.I lost the ones I carried for Years.

I'll keep everyone Posted.

Jughead · « **Reply #8 on:** December 30, 2005, 06:20:13 PM »

OK it finally Warmed up enough today to Pull the carbs off again today.I pulled The Pilot jets one at the time and looked thru them.Well 3 were Clean and #4 was Plugged.I have them soaking in Vinegar now.Hopefully I'll get to put them back in tomorrow and try it again.

Bob Wessner · « **Reply #9 on:** December 30, 2005, 06:24:09 PM »

Even after soaking, whatever is in the one slow jet may need some coaxing. Use something soft to do it though.

750goes · « **Reply #10 on:** December 30, 2005, 06:30:26 PM »

Jughead,

I stripped and cleaned mine once, then I did something real stupid, didn't check the fuel in the tank or check the fuel tank filter or other fule lines

guess what,

next time I started it, ran like a bird for about ten minutes then spluttered and died,
much frustration, no satisfaction, turned out the fuel was crap and junk in the tank..

same old story, stripped and cleaned the tank and the carbs, new CLEAN fuel, and there she goes again...

its a sad fact we all try the easy method, but it is usually the longest and logical method that wins out...........

hope this helps....

my wife tells me the same thing every night

Jughead · « **Reply #11 on:** December 30, 2005, 08:09:10 PM »

Actually the Tank is the first thing I tackled.The first time I Cleaned the Carbs I installed a New Fuel Line with a Clear Inline filter.So far no Crud.

74cb750 · « **Reply #12 on:** December 31, 2005, 01:15:01 PM »

its a sad fact we all try the easy method, but it is usually the longest and logical method that wins out...........

hope this helps....

my wife tells me the same thing every night

Hmmm....I won't I am tempted to say something byut I won't

did it work? ie, does the bike work now?

Jughead · « **Reply #13 on:** December 31, 2005, 04:42:49 PM »

OK the Carbs are Clean Enough to eat out of.I installed the Newly Cleaned Pilot Jets. Set the Screws to 1 Turn out and reattached everything back on the Bike.I tried starting it without the Choke a few times and nothing.

I pulled the Choke on and still nothing.OK I cracked the Throttle 1/4 Turn and it Fired.It ran up to 6000 and Died.I'm going to clean the Airbox real well in the Morning and Install it.I just noticed the other day that the PO Drilled holes in the Bottom of it.

Terry in Australia · « **Reply #14 on:** December 31, 2005, 04:52:33 PM »

It shuldn't make that much difference Juggy, drilling your airbox was an old performance trick, and the PO probably changed the main jets to suit. If you have to crack the throttle to make it run, I still think your pilot circuits (not the jets, the circuits)are blocked. Cheers, Terry.

Jughead · « **Reply #15 on:** December 31, 2005, 05:13:44 PM »

I went thru the Pilot Circuits with a Fine tooth Comb.Well Not a Comb but Wire,Carb cleaner and 130Lb of Compressed Air.Everything was Clear.

I think I may pull the Pilots tomorrow and see if I can Clean the holes out with some .22 Lead.

I think Hollow Points Should work.

Jughead · « **Reply #16 on:** December 31, 2005, 05:38:58 PM »

Terry I Don't think the PO went to the trouble of changing the Jetting.Around here stuff like that Just don't happen.

Terry in Australia · « **Reply #17 on:** December 31, 2005, 10:48:51 PM »

Fair enough Juggy, shoot that piece of crap, then burn it for the insurance and get that Suzy GT750 Water Buffalo up and running mate, ~~much better bike anyway!~~ Er, I mean, keep trying mate? Ha ha, Cheers, Terry.

Jughead · « **Reply #18 on:** January 01, 2006, 07:43:40 AM »

Hey Terry.I'll try the Airbox First.If that don't work I'll try to Locate some Different Earlier model Carbs.Back Before I got out of High School there was A fellow that was a Friend of my Mom and Dad who Brought me a Set of Carbs off of his 76 750K.They were Completely Crudded up.I had them Cleaned and reinstalled within a few days for him.His Bike was running like a Top.These weren't near as Bad and I just can't get it to do Anything.

mcpuffett · « **Reply #19 on:** January 01, 2006, 07:56:01 AM »

hi juggy ,i have to do the same to my carbs on my ko when the weather warms up enough to get out and do something $:-\$ it can be a pain in the arse cleaning these carbs , but once it's done it will be worth all the hassle

mick.

Terry in Australia · « **Reply #20 on:** January 01, 2006, 12:28:59 PM »

Quote from: Jughead on January 01, 2006, 07:43:40 AM

Hey Terry.I'll try the Airbox First.If that don't work I'll try to Locate some Different Earlier model Carbs.Back Before I got out of High School there was A fellow that was a Friend of my Mom and Dad who Brought me a Set of Carbs off of his 76 750K.They were Completely Crudded up.I had them Cleaned and reinstalled within a few days for him.His Bike was running like a Top.These weren't near as Bad and I just can't get it to do Anything.

G'Day Juggy, sadly the earlier carbs won't fit, due to the larger intake manifold spiggots on the F2/F2. Interestingly enough, the F2/F3 carbs were designed to run leaner than the earlier K and F carbs, and the accellerator pump built into the F2/F3 carbs was put there to fire a shot of raw fuel into the ports when you cracked the throttle (see where I'm going here?) so as to negate the infamous CB750 "flat spot" that we've all experienced when we crack the throttle on, and it takes a moment for the engine to respond.

You'd probably be better off with a good set of F2/F3 carbs to try on it, but be aware, they'll probably be gummed up too as blocked pilot circuits was common on these carbs, mainly due to the F2/F3's sitting for long spells due to other mechanical problems. As you're aware, the F2?F3 was the fastest, most powerful, best handling, best braking of all the CB750's, but the downside was that the engine mods were poorly designed, and so it was also the most fragile. I snickered at Clyde when he suggested that the best compromise would have been an F1 head and carbs on the stronger F2 bottom end, but the more i think about it, the more i know he's right, dammit! Cheers, Terry.

Jughead · « **Reply #21 on:** January 01, 2006, 03:21:27 PM »

Well the Air box didn't have any Effect on it.

OK I'll pull the Carbs Again.(I lost Count at about the 6th Time) I'll pull them Back Apart and Soak them again in the Berryman's.Next time I'm taking the Torches to them.

Bob Wessner · « **Reply #22 on:** January 01, 2006, 03:23:41 PM »

Quote

..at about the 6th Time

Only a couple of more times to go.

Just kidding, hang in there, you will get it and once you do, trust me, you will feel very gratified.

Jughead · « **Reply #23 on:** January 01, 2006, 03:28:35 PM »

I will.

Hell I have to have the Patients of Job or I would have already pushed it off of the Biggest Bridge I could find.

It's just getting to me that there's 1 Extra Carb to take care of and a whole lot of Different little Parts to remove.

Well and the Valves Don't help any either.

I thought I remembered someone saying that the Earlier F1 Carbs would work.

750goes · « **Reply #24 on:** January 01, 2006, 03:35:42 PM »

thats not a bad idea sometimes..

burn the crap out of them, but they may be a bit out of shape and a different coulour and not fit real good after that

probably make you feel better for a few minutes, then you realize

wtf have i done now....

grin and bear it......... they will work........eventually......... real soon now........f$^&%^$%^$%^n...carbies.....

remember the K.I.S.S. method - "Keep It Simple Stupid"
then there is my favourite R.T.F.M. - "Read The F@#*&%N Manual"
then maybe S.N.A.F.U. - "System Normal All F%^&*#D Up"
company round the corner from my business is called "WOFTAM"-----asked the owner what the hell this stands for
as he handed me the "stubby holder" to explain (beer cooling device) it has the company insignia reading
"Waste Of F@#$^%&"N Time And Money"

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Author Topic: Going to Kill my Carbs............... (Read 2050 times)

Jughead

ditchen

eldar

Jughead

Jughead

Jughead

Jughead

Jughead

Jughead

Jughead

Jughead

Jughead