Logo
FULL SITE MENU

What is This Part For on a 93 Johnson 25hp?

K

Klink

Regular Contributor
throttle thingy.jpg

When I advance the throttle lever by hand until it contacts the stop on the engine block, this spring part circled can flex and move the carb throttle plate past the horizontal setting. What is the purpose of this flexing piece? What is the part number and name of it. I can't find it in the parts listing.
 
What is the purpose of this flexing spring (0316368 - control lever spring)? It looks like it is a kind of shock absorber? If the throttle cable is not set right, it'll push that part to flex and throw the carb throttle plate way past horizontal.
 
Last edited:
The remote control throttle cable was set to push past the stop on the engine and so it pushed the flex spring which pushed the throttle plate past horizontal. I noticed that and adjusted the throttle cable to push only till the timing advance hit the stop.

I still don't understand what that 0316368 - control lever spring is for, all I can think is that it is a shock absorber.
 
Boobie said:
If it throws the throttle plate past horizontal you sync and link is not adjusted properly.
Click to expand...

OK, re-thinking this, something is wrong here. Please someone clarify this for me.

Here's the picture - The remote control throttle lever will travel only as far as the engine cylinder block stop allows it (if it is not connected to the engine, the remote throttle handle can travel much further, as far as the cable size can travel), however, in this case, the engine allows the throttle to go past the maximum spark advance stop and then flex this spring which then only moves (it has no effect on the maximum spark advance) the throttle control lever that moves the carb throttle plate past the horizontal position. If on the other hand, the throttle control lever is set to horizontal in the carb when the spring is flexed, it has a hard time staying there. The present practice of accelerating by pushing the remote throttle handle all the way (which then flexes the spring and makes the carb go past horizontal), and then having to pull back to get real full speed, is quite annoying. What is wrong here? Are you telling me that I'm supposed to set the carb horizontal with the spring engaged? That does not sound right to me, as the manual says nothing about this spring one way or the other.
 
Last edited:
kimcrwbr1 said:
When the timing advance hits the stop that is max timing, the spring allows the throttle butterfly to fully open without going past max timing advance. Did you look inside the carbs to see if the throttle butterfly is fully open or are you going by the lever outside the carb?
Click to expand...

I put a comma above in what you wrote to understand it properly no? You are saying then, that I should set the throttle butterfly at horizontal with the spring engaged, locked down? If I do that, there's a big drop in the butterfly when I pull back almost nothing on the throttle and the spring let's go, it is like about 40 degrees that the butterfly closes.

kimcrwbr1 said:
There are two adjustments for the sync and link. For sync on the throttle cam under the flywheel is a mark you want the throttle butterfly to just begin to open when the mark on the cam passes center of the follower roller. For the sync you loosen the collar on the link rod and advance the throttle fully to WOT. Then with one finger hold the carb fully open and push the collar up to the pivot pin and tighten the screw. The engine must be off and in forward gear to make those adjustments.
http://www.ebay.com/itm/304222-0304...EUB-/221080274700?hash=item337969470c&vxp=mtr
Click to expand...

Yes, I understand that, that is exactly how the manual says and exactly how I do it in every detail, except for the spring quirk that I'm asking about.
 
Last edited:
???------See post # 6----Many folks make adjustment on that linkage rod going forward to the carburetor.----------Just did this job on a 1969 model 33 hp.-----------At idle there is usually about a 1/4" gap at that adjustable stop.-----This appears " wrong " to the novice !!!
 
Back
Top