#2 carb nylon vacuum piston really tight

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15 Aug 2011 19:26 #469239 by garyprather
#2 carb nylon vacuum piston really tight was created by garyprather
I took the top part of my 83 1100 spectre carbs off today and noticed #2 needle slide guide was stuck not moving at all is this normal or is this why all my air screws are adjusted all the way out? It is stuck at the bottom of the slide.

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15 Aug 2011 21:20 #469258 by Motor Head
Replied by Motor Head on topic #2 carb nylon vacuum piston really tight
Take a photo and post it if you can.
If you are talking the slide it self is stuck in the carb bore, or just the nylon Needle Jet retainer stuck in the slide?

1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...

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15 Aug 2011 21:24 #469260 by garyprather
Replied by garyprather on topic #2 carb nylon vacuum piston really tight
the needle jet retainer is stuck in the slide

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15 Aug 2011 21:32 #469262 by Motor Head
Replied by Motor Head on topic #2 carb nylon vacuum piston really tight
Well that should just hold the needle down, against the bottom of the slide valve by spring pressure. Unless you are removing the needles for shimming or something, it should be ok. Soaking it with some carb clean should get it loose, just don't spray the cleaner onto the diaphragms.
All you mixture screws are turned out from lightly seated, how many turns? Should be like 1 1/2- 2 1/2, ant more and you have Air/ Vacuum leaks, and/ or plugged up Pilot/ transfer circuits.

1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...

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16 Aug 2011 00:40 #469304 by garyprather
Replied by garyprather on topic #2 carb nylon vacuum piston really tight
as of right now my screws are out 2 turns. I pulled the needles and sat the clip to the vary top groove to make it run a bit leaner off from idle. I had carb popping and my screws had to be 4 to 5 turns out in order to make it run decent. I have no clue what size of jets I have in there but as of right now all screws are at 2 turns out. I need to sync them soon.

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16 Aug 2011 00:45 - 16 Aug 2011 00:46 #469306 by Motor Head
Replied by Motor Head on topic #2 carb nylon vacuum piston really tight
I would say that you do not want the Needles set so the clip is on the last/ top notch. This will be Lean, popping is usually from lean condition. That is why you had the screws out so far, lean. Check your Intake manifold for signs of cracking, and you may want to remove them and clean the surfaces and use a good Ultra Grey silicone or threebond sealant there.
Are you using the factory Airbox or individual air filters?

1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...
Last edit: 16 Aug 2011 00:46 by Motor Head.

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24 Aug 2011 01:17 #471364 by garyprather
Replied by garyprather on topic #2 carb nylon vacuum piston really tight
Sorry to take so long to reply I am using pods with a 4 into 1 mac exhaust. I am just now seeing that you said that I should move the clip down to make it run richer? As of right now the screws are out about 3 to 4 turns from slightly seated. I guess I am sorta confused here. If I have the needle down deeper that it would cause it to run leaner. Because my mixture screws are almost turned all the way out telling me that there was to much fuel getting in. Am i going about this all wrong? The popping is gone but my screws are still out and the needle is still on the last /top notch, do I need to swap out my pilots to restrict the fuel more.

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24 Aug 2011 01:28 #471368 by garyprather
Replied by garyprather on topic #2 carb nylon vacuum piston really tight
Is this true, if so I have been going backwards. I will need to move my needle down allowing more fuel. If the mixture screw is more than 2 1/2 turns out then the Idle jet is too lean (too Small). When the mixture screw is less than 11/2 then the Idle jet is too rich (too large) Another question, are the screws I am adjusting air screws or fuel mixture screws? They are right next to the vacuum ports on the cylinder side of the carb.

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24 Aug 2011 08:46 #471407 by Motor Head
Replied by Motor Head on topic #2 carb nylon vacuum piston really tight
Those are Mixture screws, They control the Volume of air/ fuel mix going into the Idle circuit.
You never said, in this thread, whether you are using the Stock Airbox or Individual Air Filters/ Pods. But Dropping the Needle Jet like you have done, would be rare. These things are quite lean from the Factory, any Mods and it is Richer Jetting required. So if you have Pods, with CV carbs, you might need even a jet kit, or at least raising the needle up maybe all the way. That's if the needles have adjustment grooves, USA bikes did not, stock.
Have you checked your Intake Manifolds for Vacuum Leaks? Very Important to do so.

1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...

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24 Aug 2011 09:55 #471416 by garyprather
Replied by garyprather on topic #2 carb nylon vacuum piston really tight
I will double check for leaks. The boots look great but will check again. I have done a compression check on this bike it was in the low 190s and high 180s on all four. It runs great other than I cannot get ride of that slight hesitation off the line. And I didn't think my mixture screws should be out 4 turns.

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24 Aug 2011 10:03 #471420 by Motor Head
Replied by Motor Head on topic #2 carb nylon vacuum piston really tight
OK I see now where you posted the Mac & Pod's.
There are some members who report success with this type of setup. Personally I would not run Pod's, with CV carbs.
But if your needles have adjustment grooves, raise the needle at least one, if not two notches.
If the stock pilot jet, 37.5 is in there it will be to lean, IMO.
#40 pilots work great in my 1000 with these carbs, but stock airbox and 4-1 EX.
You also will need to up the main jet size for this set up. 127 or larger.
There would be a great number of posts on the subject of Pod's, also with these CV BS34 carbs.
Some helpful info could be found in those threads.

1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...

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24 Aug 2011 10:36 #471427 by garyprather
Replied by garyprather on topic #2 carb nylon vacuum piston really tight
just to clarify something when my screws are out 4 turns is it making my bike run leaner or richer ?

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