Aggressive throttle

[biker]

Winston

The lever justs sits on a little ball, you just need to lever it off but carefully, they are only made of a nylon/plasticy stuff.

As you suggested it would probably need a good cleanup and maybe some fine sandpaper on the ball as it might be rusted up. Putting it back on is easier - just pops back on the ball.

Regards

Biker

[winstonsmith]

I'm having a hard time explaining what it is exactly so I have shaded in the problem area in the picture. The part that is glowing red is the part that is getting stuck. The yellow part right above it is the bolt that holds it in. The yellow/grayish part below it is a spring the lever is using to pivot. The spring itself seems fine as do the other springs below that can't be seen in this picture. When you step on the gas pedal the linkage pushes this lever (red part) down. Unfortunately this lever gets stuck in the resting (idle) position and needs more force than normal applied to the gas pedal to get it to break free and start moving. When it does break free it is immediately easy to move which means at that particular point of breaking free all of a sudden the car is revving very high because I have then pushed the pedal too far. This makes it very difficult to shift smoothly as I have to keep feathering the gas pedal with the clutch pushed in until I'm sure it's unstuck and moving. I need to take this lever piece off and clean it up as well as whatever it is inside that it pivots on. The part it is connected to is called what? The throttle body? It looks pretty easy to take this piece off but I don't know what's inside there that might come out with it.

[biker]

Winston

What kind of carbs are your runnning or is it a FI. Picture is quite detailed up close but I cannot pickup where this part you have highlighted is attached to.

Can you get another picture that shows the area better (zoom out).

I do not recognise any of the parts that you are showing that are so close to the Dizzy. Then again i am form Aus and we have things back to front down here.

Biker

[Murph]

Biker: It's FI and you're looking at the throttle body.

[biker]

That would explain why the linkages are on back to front

[Aussie Zed]

I always thought that the thottle felt sticky because of the way that the hitachi SUs idle. They have very big throttle butterflies and these idle at a fery closed position, with the engine vacuum sucking them closed. The sicky feeling is the breaking of this suction wich makes your movement jerky.

I could very well be wrong in saying this, but that's what i thought.

[Tommo560]

yeah that makes sense to me.

i have webers and this isnt a problem for me so maybe it is a carbie thing, but then again maybe not as my driving instructors car had the same problem and it was fuel injected?????? i dunno, well if the fix works then thats what maters isnt it.

Tom.

[Murph]

I always thought that the thottle felt sticky because of the way that the hitachi SUs idle. They have very big throttle butterflies and these idle at a fery closed position, with the engine vacuum sucking them closed. The sicky feeling is the breaking of this suction wich makes your movement jerky.

I could very well be wrong in saying this, but that's what i thought.

It's not that, as the throttle shaft runs down the centre of the butterfly, the force on the butterfy from the air/vacuum is the same on either side. Hence the air can't try and "turn" the butterfly in either direction.

My understanding of the problem is that it's purely due to worn linkages. The same problem affects both those of us with SUs and those of us with FI.

[Tommo560]

gotcha,

so its just an age thing then.

Tom.

[winstonsmith]

OK, I just decided to start taking the stuff off and see what happens. It wasn't nearly as intricate as I thought it might be. Anyway, I now see that the red piece sits in a small shaft that goes inside the throttle body. This red piece is connected to the shaft and the shaft is what is moving hence the shaft is what is gettint stuck NOT the red piece. Anyway, I completely cleaned off the springs and the red lever piece and put everything back together. I don't know how to get the shaft thing out of the thottle body to clean it up but that appears to be what is getting stuck. Maybe just cleaning all this stuff will have solved the problem though I hope. I'm going to go test it out soon and see what happens. If this doesn't fix it how do I get the shaft out of the throttle body? Is that possible? It doesn't look like it comes out.

[Murph]

It'll probably be easiest to remove the throttle body from the car. I'd guess the shaft wont be easily removeable (but might), but having it out of the car will allow you to clean and lubricate it all properly. If you do identify it as being the TB with the problem then you can always look around for another one in better condition.

[winstonsmith]

Yeah, it's the shaft that goes into the throttle body that's the problem. I cleaned up everything else and it didn't help anything. The only thing that has worked so far is spraying WD-40 on the throttle body shaft but that obviously doesn't last long.