max_power
12-22-2005, 02:33 PM
I am working on a 1986 Ariens Sno-Thro with a 3.5 hp Tecumseh engine. The model number for the engine is HSK35-45589R. The model number for this carb is 632378A. It had not been run in 8 years when I got it. I had to take the carb apart and clean it out with carb cleaner before it would run.
When I first started dialing the carb settings I was doing it without the air box covering the carb. (I didn't know the box would effect the settings at the time) I was able to dial it in with a with setting that were about .25 turns richer than recommended. (recommended is 1 turn out on the idle and 1.5 on the main) It ran GREAT! When I would lift the throttle lever it would idle up to high rpms smooth as butter.
Before I continue I need to say this:
The throttle assembly goes like this:
Throttle lever — Spring — Throttle connecting arm — Throttle linkage Wire — Throttle
Then I put the air box over the carb, thinking my work here was done. Not so. I guess the air box restricts just enough air to make a difference, so I had to lean out my setting to the 1/1.5 setting to get it to run smoothly. However, I noticed that my throttle lever was set to idle but it was giving me much higher RPMs than with the air box off. I then tried to open the throttle lever up... No change. No matter what throttle position I put the lever in, it just continued to idle at a relativly fast pace.
When I move the throttle lever to the open position the spring just expands, but the Throttle connecting arm does not move. I can reach in and pull the Throttle connecting arm with my finger then it opens up right away.
Is it possible that the spring attaching the two levers on a twenty year old machine is just fatigued? Or could there be something else at play here?
When I first started dialing the carb settings I was doing it without the air box covering the carb. (I didn't know the box would effect the settings at the time) I was able to dial it in with a with setting that were about .25 turns richer than recommended. (recommended is 1 turn out on the idle and 1.5 on the main) It ran GREAT! When I would lift the throttle lever it would idle up to high rpms smooth as butter.
Before I continue I need to say this:
The throttle assembly goes like this:
Throttle lever — Spring — Throttle connecting arm — Throttle linkage Wire — Throttle
Then I put the air box over the carb, thinking my work here was done. Not so. I guess the air box restricts just enough air to make a difference, so I had to lean out my setting to the 1/1.5 setting to get it to run smoothly. However, I noticed that my throttle lever was set to idle but it was giving me much higher RPMs than with the air box off. I then tried to open the throttle lever up... No change. No matter what throttle position I put the lever in, it just continued to idle at a relativly fast pace.
When I move the throttle lever to the open position the spring just expands, but the Throttle connecting arm does not move. I can reach in and pull the Throttle connecting arm with my finger then it opens up right away.
Is it possible that the spring attaching the two levers on a twenty year old machine is just fatigued? Or could there be something else at play here?