Hi,
I finally decided to try to rebuild my carb myself.
Original carb 1974 FJ40, carb build date 3J2, PN 21100-60300
Carb was working ok but not able to get down to idle speed (minimum 800rpm and idle mixture screw doing nothing) so probably some junk blocking the circuit. Maybe an intermittent air leak also but not too sure about that.
When I was doing my tests on the carb I clearly tested and saw the pump spraying gas when pumping the throttle and it was working consistently.
Carb had never been rebuilt but top had been opened a few times by various Mechanics over the decades...
Anyway my carb was one of the last big thing untouched so I finally bought an ultrasonic machine to be able to clean it and started dissembling the thing.
I carefully followed @Pin_Head Youtube tutoriel step by step but surprise, where the ball bearing check valve is supposed to be (the one in upward direction just before the spray) there was nothing...
The spring, clip and ball under pump were present.
So, trying to understand the schematics and the fuel path, without this valve the pump could pump both air and/or fuel instead of only fuel. It seems it was working ok before so not too sure if this is a big issue to miss those parts ?
And also is there a source to replace those parts? Never seen them for sale and they are not included in my Keyster rebuild kit (except the ball). Maybe in other kits?
Oh and I was going to add that opening the carb the gasket stayed glued to the bottom part so could not have had the parts flying away without me noticing.
But looking at the picture just now, here what I see... The gasket was broken and not correctly aligned... If I'm not mistaken this is idle fuel path... -_-
Damn if this was the only source of my issue because a sloppy mechanic didn't put it back correctly
And last problem I have the main jet for primary that is stuck in place and started to disintegrate... It's spending the night in WD40 after some time in the ultrasonic bath and I hope it will cooperate but it's hard to have a grip now -_-'
I finally decided to try to rebuild my carb myself.
Original carb 1974 FJ40, carb build date 3J2, PN 21100-60300
Carb was working ok but not able to get down to idle speed (minimum 800rpm and idle mixture screw doing nothing) so probably some junk blocking the circuit. Maybe an intermittent air leak also but not too sure about that.
When I was doing my tests on the carb I clearly tested and saw the pump spraying gas when pumping the throttle and it was working consistently.
Carb had never been rebuilt but top had been opened a few times by various Mechanics over the decades...
Anyway my carb was one of the last big thing untouched so I finally bought an ultrasonic machine to be able to clean it and started dissembling the thing.
I carefully followed @Pin_Head Youtube tutoriel step by step but surprise, where the ball bearing check valve is supposed to be (the one in upward direction just before the spray) there was nothing...
The spring, clip and ball under pump were present.
So, trying to understand the schematics and the fuel path, without this valve the pump could pump both air and/or fuel instead of only fuel. It seems it was working ok before so not too sure if this is a big issue to miss those parts ?
And also is there a source to replace those parts? Never seen them for sale and they are not included in my Keyster rebuild kit (except the ball). Maybe in other kits?
Oh and I was going to add that opening the carb the gasket stayed glued to the bottom part so could not have had the parts flying away without me noticing.
But looking at the picture just now, here what I see... The gasket was broken and not correctly aligned... If I'm not mistaken this is idle fuel path... -_-
Damn if this was the only source of my issue because a sloppy mechanic didn't put it back correctly
And last problem I have the main jet for primary that is stuck in place and started to disintegrate... It's spending the night in WD40 after some time in the ultrasonic bath and I hope it will cooperate but it's hard to have a grip now -_-'