Nikki issues!
04-26-12, 07:35 AM
#1
Nikki issues!
So last night I drove my FB for the first time in over a year. That's the good news. The bad news is that I can't get it to run off choke.
Good:
Rebuilt motor (good compression, timing is set properly)
Floats are set properly
Rebuilt carb
Bad:
-Motor builder either used warped housings or pinched the coolant seals, so I have some Bars heavy duty copper-based sealer and AlumaSeal in the radiator. Pisses coolant out of the outside of the housings, not into the combustion chambers.
-Accelerator pump won't fill with fuel.
---Check ball and weight are in their proper place, rear fuel bowl has fuel at proper level, and the passage is clear
-Motor won't run below 2000rpm.
---Sprayed around carb with ether and didn't see any change in engine speed. No vacuum leaks.
-Motor won't run off of choke
---I release the choke after the motor has warmed up, and if it's not under load it'll go from 4k to 6.5k rpm, and then slowly "idle down" to 2k rpm, and then die.
---I release the choke after the motor has warmed up, under load, and press the accelerator. I can hear the primaries opening, but the motor won't make any power. It bogs, and then starts backfiring.
---If the choke is held closed it'll make a usable, but not adequate, amount of power to 4k, and then it falls on its face. I know my secondaries aren't actuating, but the lack of power below 4k, and the fact that it will run OK on choke, bothers me.
I worked through the idle tuning process on Sterling's site with no luck. Any suggestions? I know a lot of my issues are coming from my accelerator pump not filling with fuel.
Thanks in advance
-Jim
Good:
Rebuilt motor (good compression, timing is set properly)
Floats are set properly
Rebuilt carb
Bad:
-Motor builder either used warped housings or pinched the coolant seals, so I have some Bars heavy duty copper-based sealer and AlumaSeal in the radiator. Pisses coolant out of the outside of the housings, not into the combustion chambers.
-Accelerator pump won't fill with fuel.
---Check ball and weight are in their proper place, rear fuel bowl has fuel at proper level, and the passage is clear
-Motor won't run below 2000rpm.
---Sprayed around carb with ether and didn't see any change in engine speed. No vacuum leaks.
-Motor won't run off of choke
---I release the choke after the motor has warmed up, and if it's not under load it'll go from 4k to 6.5k rpm, and then slowly "idle down" to 2k rpm, and then die.
---I release the choke after the motor has warmed up, under load, and press the accelerator. I can hear the primaries opening, but the motor won't make any power. It bogs, and then starts backfiring.
---If the choke is held closed it'll make a usable, but not adequate, amount of power to 4k, and then it falls on its face. I know my secondaries aren't actuating, but the lack of power below 4k, and the fact that it will run OK on choke, bothers me.
I worked through the idle tuning process on Sterling's site with no luck. Any suggestions? I know a lot of my issues are coming from my accelerator pump not filling with fuel.
Thanks in advance
-Jim
04-28-12, 02:45 PM
#6
Halfway up the sight glasses.
Also, I was thinking: The jets in the bowls. Two numbers are stamped on them, depending on whether they're primary or secondary. There should be one of each number in each fuel bowl, correct?
Trending Topics
05-04-12, 02:01 PM
#13
Team SR
The AP pump takes fuel from the bowl directly in behind it. There is a small passage at the bottom of the bowl. Are there ANY signs of fuel leakage from the AP pump housing?
05-04-12, 02:16 PM
#14
Check ball and weight are in the correct locations and orientation (check ball went in first...weight on top of it...)
05-05-12, 09:12 PM
#16
Junior Member
Join Date: Nov 2007
Location: NH
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
Ya since it sat I would check the pilot circuit. Not sure if they come out of the carb easy. I have a couple spare Nikkis. I have the same issue with my 79 that has sat for probably 8 of the last 10 years.
05-06-12, 11:27 PM
#18
1985rx7mikesrx7
ok this might be a some what dumb answer but it worked pretty good for me when i started my car after it sat for 3years. when i first started it it didnt run right at all n did not want to idle at all. i smiply put seafoam in the gas tank alnog with 2gallons of 93. (gas tank was completly empty) it would idle after that but still did not run right. i found that the shutter valve was stuck open. i got it working again now car runs fine. (other then i need new plugs n wires) but i no longer have carb problems. yours sounds more sirius tho but i thought i would try to help.
05-07-12, 07:14 AM
#19
ok this might be a some what dumb answer but it worked pretty good for me when i started my car after it sat for 3years. when i first started it it didnt run right at all n did not want to idle at all. i smiply put seafoam in the gas tank alnog with 2gallons of 93. (gas tank was completly empty) it would idle after that but still did not run right. i found that the shutter valve was stuck open. i got it working again now car runs fine. (other then i need new plugs n wires) but i no longer have carb problems. yours sounds more sirius tho but i thought i would try to help.
05-08-12, 09:50 AM
#21
You keep saying "check ball and weight."
There are 2 check *****, and 2 weights, in the accel pump circuit:
One ball and one (thin) weight under a jetted plug near the pump itself.
One ball and (fat) weight under the accel nozzle itself, center of the primary barrels.
If the ball and weight under the nozzle aren't there, the pump can't fill because it just sucks air back thru the nozzle.
If the ball and weight near the accel pump aren't there, the pump can fill but won't squirt - - fuel just gets pressed back into the bowl.
There are 2 check *****, and 2 weights, in the accel pump circuit:
One ball and one (thin) weight under a jetted plug near the pump itself.
One ball and (fat) weight under the accel nozzle itself, center of the primary barrels.
If the ball and weight under the nozzle aren't there, the pump can't fill because it just sucks air back thru the nozzle.
If the ball and weight near the accel pump aren't there, the pump can fill but won't squirt - - fuel just gets pressed back into the bowl.
05-08-12, 09:53 AM
#22
Team SR
You keep saying "check ball and weight."
There are 2 check *****, and 2 weights, in the accel pump circuit:
One ball and one (thin) weight under a jetted plug near the pump itself.
One ball and (fat) weight under the accel nozzle itself, center of the primary barrels.
If the ball and weight under the nozzle aren't there, the pump can't fill because it just sucks air back thru the nozzle.
If the ball and weight near the accel pump aren't there, the pump can fill but won't squirt - - fuel just gets pressed back into the bowl.
There are 2 check *****, and 2 weights, in the accel pump circuit:
One ball and one (thin) weight under a jetted plug near the pump itself.
One ball and (fat) weight under the accel nozzle itself, center of the primary barrels.
If the ball and weight under the nozzle aren't there, the pump can't fill because it just sucks air back thru the nozzle.
If the ball and weight near the accel pump aren't there, the pump can fill but won't squirt - - fuel just gets pressed back into the bowl.
05-08-12, 01:52 PM
#23
You keep saying "check ball and weight."
There are 2 check *****, and 2 weights, in the accel pump circuit:
One ball and one (thin) weight under a jetted plug near the pump itself.
One ball and (fat) weight under the accel nozzle itself, center of the primary barrels.
If the ball and weight under the nozzle aren't there, the pump can't fill because it just sucks air back thru the nozzle.
If the ball and weight near the accel pump aren't there, the pump can fill but won't squirt - - fuel just gets pressed back into the bowl.
There are 2 check *****, and 2 weights, in the accel pump circuit:
One ball and one (thin) weight under a jetted plug near the pump itself.
One ball and (fat) weight under the accel nozzle itself, center of the primary barrels.
If the ball and weight under the nozzle aren't there, the pump can't fill because it just sucks air back thru the nozzle.
If the ball and weight near the accel pump aren't there, the pump can fill but won't squirt - - fuel just gets pressed back into the bowl.