anyone have bendix tuning insructions?
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anyone have bendix tuning insructions?
A few of you know I just got a bendix carb to replace my POS edelbrock. I got everything on today, all the cable issues are worked out no big deal, however I am running way to rich. I mean plugs are black within one min. I cant find instructions for tuning these things any where. I hear they are very easy. I think I just need to get a smaller jet. Anyone have suggestions on needle size, If i remember right, I think its got a 157 in it right now. Bike is 75xlch, stock air cleaner (not for very long) 1 3/4 drags, bored .50 over and 10:1 pistons
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RE: anyone have bendix tuning insructions?
Here you go.
These are jpeg files, so I hope you can read them.............pg
[IMG]local://upfiles/8331/0AF015AE94634FB1AF13C8BF439FBD2A.jpg[/IMG]
[IMG]local://upfiles/8331/4F2F618697104FEE8FB0E9E8ED5DBAC0.jpg[/IMG]
These are jpeg files, so I hope you can read them.............pg
[IMG]local://upfiles/8331/0AF015AE94634FB1AF13C8BF439FBD2A.jpg[/IMG]
[IMG]local://upfiles/8331/4F2F618697104FEE8FB0E9E8ED5DBAC0.jpg[/IMG]
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RE: anyone have bendix tuning insructions?
Sounds to me like you have your pilot jet set too rich.
Pilot jet is the one closest to the intake on top.
Set this to 1 1/2 turns out from just seated ( turned in but only until it just hits- not tightened).
Start bike, get it warmed up. Set idle to about 1000rpm using the idle adjustment screw (the one on side next to where cable connects). then turn pilot screw in ( a 1/4 turn at a time or less)until it starts to idle fast. Crack throttle. If it bogs real bad, it's too lean. If it just hesitates, it is a hair too lean and just past the sweet spot. So, you want to set the pilot screw to just before it hesitates when you blip the throttle.
Then set idle screw to get correct idle.
Then ride it, see what you have. Pilot screw turned clockwiseis leaner, anti-clockwise is richer.
So you know, the pilot screw controls low speed mixture, the main jet ( one that comes up from bottom of bowl) controls high speed running. Then you have the acceleration pump that squirts gas in a stream for instant throttle response.
Also take into account your timing/points must be right first. Your push-rods must be adjusted right first. You must have no intake or exhaust leaks first- before you attempt to tune carb. Otherwise all tuning on carb is a waste of time.
I also suggest you get an adjustable main jet kit for the Bendix to be able to easily tune the high speed without a jet change.
Bendix is plumb dumb simple. You'll get how to tune it and then love this carb.
Best of luck.
ALSO- get a factory service manual if you do not have one. It explains all Bendix tuning and rebuilding in detail. And with pictures.
Pilot jet is the one closest to the intake on top.
Set this to 1 1/2 turns out from just seated ( turned in but only until it just hits- not tightened).
Start bike, get it warmed up. Set idle to about 1000rpm using the idle adjustment screw (the one on side next to where cable connects). then turn pilot screw in ( a 1/4 turn at a time or less)until it starts to idle fast. Crack throttle. If it bogs real bad, it's too lean. If it just hesitates, it is a hair too lean and just past the sweet spot. So, you want to set the pilot screw to just before it hesitates when you blip the throttle.
Then set idle screw to get correct idle.
Then ride it, see what you have. Pilot screw turned clockwiseis leaner, anti-clockwise is richer.
So you know, the pilot screw controls low speed mixture, the main jet ( one that comes up from bottom of bowl) controls high speed running. Then you have the acceleration pump that squirts gas in a stream for instant throttle response.
Also take into account your timing/points must be right first. Your push-rods must be adjusted right first. You must have no intake or exhaust leaks first- before you attempt to tune carb. Otherwise all tuning on carb is a waste of time.
I also suggest you get an adjustable main jet kit for the Bendix to be able to easily tune the high speed without a jet change.
Bendix is plumb dumb simple. You'll get how to tune it and then love this carb.
Best of luck.
ALSO- get a factory service manual if you do not have one. It explains all Bendix tuning and rebuilding in detail. And with pictures.
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RE: anyone have bendix tuning insructions?
Thanks pinion, I figured you would have them. Now after reading them, is there supposed to be a sring on the high speed needle ( like there is on the low) The directions indicate that both adjustment screws should have a spring to give pressure. I have a spring on the screw closest to the engine, but the main needle screw I just have tightened all the way in. I guess this could be my problem huh?
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RE: anyone have bendix tuning insructions?
ORIGINAL: csd4682
Thanks pinion, I figured you would have them. Now after reading them, is there supposed to be a sring on the high speed needle ( like there is on the low) The directions indicate that both adjustment screws should have a spring to give pressure. I have a spring on the screw closest to the engine, but the main needle screw I just have tightened all the way in. I guess this could be my problem huh?
Thanks pinion, I figured you would have them. Now after reading them, is there supposed to be a sring on the high speed needle ( like there is on the low) The directions indicate that both adjustment screws should have a spring to give pressure. I have a spring on the screw closest to the engine, but the main needle screw I just have tightened all the way in. I guess this could be my problem huh?
Those instructions are also for a big twin if you look at them. But the instructions are close if not perfect.
Do not worry about your main jet. Set your pilot jetscrew ( low speed)first as suggested.
If you look at how a bendix works in the service manual, you will see why I say this.
Not to mention I've been there - done that with a bendix before I learned.
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RE: anyone have bendix tuning insructions?
csd4682....
The needle closest to the engine is the low speed adjustment.
The one back towards the air cleaner is the high speed jet needle.
The Bendix is available in two different types.....Fixed Main Jet and Adjustable Main Jet.
The Fixed Jet model will have a small screw tightened against the carb body.
The Adjustable model will have a larger diameter screw head with knurling ridges around it's head, and have a coil spring under it.
You may have a fixed jet Bendix. If it is, that is fine. Don't try to make it into and adjustable model. My Bendix is an adjustable model and I wish it were a fixed jet myself. Once the adjustable jet is correctly set, you never will have to touch it again. So it is not worth trying to change it.
Let me ask you this......
Did you buy a new Bendix or was it a used Bendix?
If it was used, then it may have a problem with an O ring inside that needs replacing.
If it was a new Bendix, then all you need to do is adjust the low speed first, then check out the main jet operation by just following the instructions.
The only difference between the Bendix Adjustabe and Fixed Jet models is one you can adjust with a needle and the other requires you to remove the fixed jet and replace with a jet of different size. What comes with a Bendix Fixed Jet is 99.9% of the time the correct size fixed jet..........pg
The needle closest to the engine is the low speed adjustment.
The one back towards the air cleaner is the high speed jet needle.
The Bendix is available in two different types.....Fixed Main Jet and Adjustable Main Jet.
The Fixed Jet model will have a small screw tightened against the carb body.
The Adjustable model will have a larger diameter screw head with knurling ridges around it's head, and have a coil spring under it.
You may have a fixed jet Bendix. If it is, that is fine. Don't try to make it into and adjustable model. My Bendix is an adjustable model and I wish it were a fixed jet myself. Once the adjustable jet is correctly set, you never will have to touch it again. So it is not worth trying to change it.
Let me ask you this......
Did you buy a new Bendix or was it a used Bendix?
If it was used, then it may have a problem with an O ring inside that needs replacing.
If it was a new Bendix, then all you need to do is adjust the low speed first, then check out the main jet operation by just following the instructions.
The only difference between the Bendix Adjustabe and Fixed Jet models is one you can adjust with a needle and the other requires you to remove the fixed jet and replace with a jet of different size. What comes with a Bendix Fixed Jet is 99.9% of the time the correct size fixed jet..........pg
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RE: anyone have bendix tuning insructions?
it is a used carb. I put on all new gaskets, and replaced to o-ring you mentioned in another thread.
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From: Houston Texas
RE: anyone have bendix tuning insructions?
That should do it then.
What kind of condition was your O ring in?
Be sure the float level is set close to correct also......pg
What kind of condition was your O ring in?
Be sure the float level is set close to correct also......pg
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RE: anyone have bendix tuning insructions?
how do I know what level it should be set to, I have been wondering if this may be part of the problem, when putting everything together it seemed that thefill level waspretty high to me, but I've never worked on this carb, so I left it alone. I started the bike up again and took the air cleaner off to look inside to see whats going on. I have never seen so much gas being given. It really seems like I need to go to a smaller jet. I wasable to cross the jet numbers to more modern #'s I have a 1.10mm jet right now, I can go as low as .95mm
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RE: anyone have bendix tuning insructions?
Remove carb, remove float bowl,invert carb, measure distance between float opposite the hinge and gasket mating surface. It needs to be exactly 3/16 inch. Measure using a 3/16 inch drill bit. Bend tab that contacts float valve needle to correct the distance.
I strongly suggest investing in a service manual as all these questions are plainly answered in it.
I strongly suggest investing in a service manual as all these questions are plainly answered in it.