Baseline adjustments on a Trollhole carb ('77) (1 Viewer)

[btbuild]

The spring in the middle of the first picture looks like it might be the throttle close spring, but it looks like there is no more retraction left in it, so you may have to adjust its length to get it to close all the way all the time.

When I pull up on throttle I cannot see any of the springs I can see move/actuate.

 

[Scott Parsley]

Sorry this is a crude diagram of what I think you need. I had the same exact problem when I first installed my TH carb. Red is a spring and green is a bracket that it secures to. This fixed the problem for me.

 

[65swb45]

That is a secondary spring. The primary spring pulls horizontally on the little arm that sticks out from main throttle shaft.

 

[btbuild]

Sorry this is a crude diagram of what I think you need. I had the same exact problem when I first installed my TH carb. Red is a spring and green is a bracket that it secures to. This fixed the problem for me.

View attachment 1586910

Thank you so much! I will give Marshall a call in the morning and see what he can get for me.

 

[btbuild]

I just received the return spring from Marshal but I'm having trouble on just where to attach it. Does any one have a pic of a trolhole carb with the throttle return spring attached that I can look at?

 

[Pin_Head]

As I said before, you are missing the bracket that bolts to the base of the carb that the other end of the spring attaches to. It is represented by the green line in the diagram that Scott posted above. It is not part of the carb, it is part of the linkage. It is part number 66 on page 42 of the Specter Off Road catalog.

 

[btbuild]

As I said before, you are missing the bracket that bolts to the base of the carb that the other end of the spring attaches to. It is represented by the green line in the diagram that Scott posted above. It is not part of the carb, it is part of the linkage. It is page number 66 on page 42 of the Specter Off Road catalog.

I asked marshal about this and he said there is not one. So I'm a little bit irritated right now. I specifically asked him.
I even had him look at the pictures I posted. I guess I'll just have to fab up my own bracket.
@Trollhole

 

[Pin_Head]

If you replaced an OEM Aisan carb, you should still have the bracket. If you had some other carb, then maybe the P.O. threw it away.

 

[ginmtb]

The bracket is from the original carb. Mine is slightly different since it isn’t cable actuated but looks like could be used either way. Trollhole carb btw.

 

[btbuild]

If you replaced an OEM Aisan carb, you should still have the bracket. If you had some other carb, then maybe the P.O. threw it away.

The bracket is from the original carb. Mine is slightly different since it isn’t cable actuated but looks like could be used either way. Trollhole carb btw.

View attachment 1591257 View attachment 1591258

I will look and see if I can find that bracket from old carb. I don’t remember having one. I do have the original carb in my spare parts storage. Hope it’s there. Thank you.

 

[ginmtb]

Here’s a shot of the bracket detached for reference.

 

[thebigredrocker]

btbuild- I snapped a few photo’s of an Aisan bracket. I think this would be simple to make. Pretty sure it’s a 10/69-72ish Japanese bracket. Carb pictured is an Aisan 4 I 26. You guys do know 65swb45 has an obscene collection of Japanese carbs right? You know...if you ever want to ditch your chinese knock off’s for a musem quality, raw power producing Aisan Mark might even throw in a bracket

 

[thebigredrocker]

Here’s a few measurements.

 

[ginmtb]

I have the oem carb and plan on rebuilding at some point and swapping it out. But in the meantime I’m doing other stuff since it works well.

 

[thebigredrocker]

Gin- What you need to do is go buy that other cruiser you’ve been eyeballing

 

[btbuild]

Finally got around to making a return spring bracket for my trollhole carb. It’s not super clean but does the job. I did notice on my long drive yesterday that when I was coming down from the mountain I was getting some popping out the tail pipe. I suppose I need to start eliminating culprits one by one.

 

[thebigredrocker]

@Vae Victus
Here’s the bracket build thread

 

[65swb45]

PN 057-40AR, from my Specials Page.

 

[Vae Victus]

@Vae Victus
Here’s the bracket build thread

Thanks big red, I see it now.

 

[thebigredrocker]

Link to Mark’s reproduction bracket:
For Sale - 057-throttle return spring brackets