Alright, I'm gonna do my best here and hopefully someone out there will know what the heck I'm talking about!
I have a 1989 30hp Johnson. I've been working on getting it running better. I purchased the Seloc online manual and have been trying to give it a "tune up".
The manual seems to be a bit disconnected or maybe I'm just not getting it.
Here's what I'm trying to figure out... I guess really it boils down to understanding the relationships between all of the adjustments, or rather what order they should be adjusted in.
For example... In the manual speaking of syncronization it tells me to change the adjustment on the carb arm so that the cam follower is exactly between the two marks at the exact moment the throttle arm starts to move.
That's easy enough and I understand. But there was also another adjustment that is basically a "set coller" on the wire that connects the cam follower mechanism back to the throttle itself. Let me try to explain that better. The throttle (on the tiller) is connected via cable back to a shaft. On the opposite side of that shaft is the mechanism that advances the timing. That same mechanism is connected via a wire back to the cam follower. There is a coller on that wire that sets "where" the cam follower actually starts to move.
Anyway, this "coller" was loose and was moving free at one point. It seems to me that it serves almost the same purpose as the adjustment on the carb arm. But I know there's something I'm missing there. I've set it where I think it's right, but I really have no clue...
All I really know is that when the the throttle shaft starts to move the follower is right between the marks... Is there something else I should be checking or doing? What is the relationship between the two above mentioned adjustments?
Here's another example. The section on setting the low-speed needle says to start at 1 1/2 turns out, lean it 1/8th of a turn at a time until the motor spits or cuts out, then back up 1/4 turn. It also mentions the idle at that adjustment should be around 950rpm.
Two problems... First, with my idle trim (on the tiller) turned as low as it can go the lowest I can get it to idle (in a "barrel 'o water", not muffs) is about 1400 rpm (drops to about 1100 in forward gear). I'm assuming there is a way to adjust or change this.... I'm not sure how or what and rather it has any effect on the above sync settings... which should be adjusted first?
Second, starting at 1 1/2 turns out the motor is already spitting and sputtering. I have to back the needle out about 2 turns for it to run good and then do the above adjustment procedure. Doing so yields it's best "setting" to be about 1 3/4 turn out. Is this normal? Does it have anything to do with the sync and / or idle speed?
Next is timing... The book says to get the RPM's above 3500 and then set to 30 degrees. Several problems... First and foremost I can't really do this cause I don't have a dock to tie off to. My "bucket 'o water" would never hold up (or rather keep in) in forward gear at that high of an RPM.
Besides that though, it doesn't quit make any sense. I see the point where it says I would "adjust" the timing.. The "stop"... But the "timing advance mechanism" (the part that turns as the throttle is advanced) doesn't even HIT that stop until EXACTLY full throttle. Is that normal? It doesn't seem like it to me. Shouldn't it get to that point before? (i.e. at least by 3500 rpm as the book states?)
I know I'm asking a lot of questions here, and all relatively disconnected... I'm just trying to pull all this together and figure out how to go about getting this thing running properly... I can't help but feel like I'm missing some things and it's effecting me being able to get this thing running properly...
*Edit* Almost forgot... One other thing I noticed... When I advance the throttle the butterfly opens normally as expected... However, as I move to full throttle the butterfly goes BEYOND horizontal (full open) and continues on till it's probably close to half way shut again... Is this normal or is this yet another adjustment I need to make???
Can someone please try their best to explain all of the adjustments and which order they should be done in? You have no idea how much I would truely appreciate it!
Thanks in advance...
Greg
I have a 1989 30hp Johnson. I've been working on getting it running better. I purchased the Seloc online manual and have been trying to give it a "tune up".
The manual seems to be a bit disconnected or maybe I'm just not getting it.
Here's what I'm trying to figure out... I guess really it boils down to understanding the relationships between all of the adjustments, or rather what order they should be adjusted in.
For example... In the manual speaking of syncronization it tells me to change the adjustment on the carb arm so that the cam follower is exactly between the two marks at the exact moment the throttle arm starts to move.
That's easy enough and I understand. But there was also another adjustment that is basically a "set coller" on the wire that connects the cam follower mechanism back to the throttle itself. Let me try to explain that better. The throttle (on the tiller) is connected via cable back to a shaft. On the opposite side of that shaft is the mechanism that advances the timing. That same mechanism is connected via a wire back to the cam follower. There is a coller on that wire that sets "where" the cam follower actually starts to move.
Anyway, this "coller" was loose and was moving free at one point. It seems to me that it serves almost the same purpose as the adjustment on the carb arm. But I know there's something I'm missing there. I've set it where I think it's right, but I really have no clue...
All I really know is that when the the throttle shaft starts to move the follower is right between the marks... Is there something else I should be checking or doing? What is the relationship between the two above mentioned adjustments?
Here's another example. The section on setting the low-speed needle says to start at 1 1/2 turns out, lean it 1/8th of a turn at a time until the motor spits or cuts out, then back up 1/4 turn. It also mentions the idle at that adjustment should be around 950rpm.
Two problems... First, with my idle trim (on the tiller) turned as low as it can go the lowest I can get it to idle (in a "barrel 'o water", not muffs) is about 1400 rpm (drops to about 1100 in forward gear). I'm assuming there is a way to adjust or change this.... I'm not sure how or what and rather it has any effect on the above sync settings... which should be adjusted first?
Second, starting at 1 1/2 turns out the motor is already spitting and sputtering. I have to back the needle out about 2 turns for it to run good and then do the above adjustment procedure. Doing so yields it's best "setting" to be about 1 3/4 turn out. Is this normal? Does it have anything to do with the sync and / or idle speed?
Next is timing... The book says to get the RPM's above 3500 and then set to 30 degrees. Several problems... First and foremost I can't really do this cause I don't have a dock to tie off to. My "bucket 'o water" would never hold up (or rather keep in) in forward gear at that high of an RPM.
Besides that though, it doesn't quit make any sense. I see the point where it says I would "adjust" the timing.. The "stop"... But the "timing advance mechanism" (the part that turns as the throttle is advanced) doesn't even HIT that stop until EXACTLY full throttle. Is that normal? It doesn't seem like it to me. Shouldn't it get to that point before? (i.e. at least by 3500 rpm as the book states?)
I know I'm asking a lot of questions here, and all relatively disconnected... I'm just trying to pull all this together and figure out how to go about getting this thing running properly... I can't help but feel like I'm missing some things and it's effecting me being able to get this thing running properly...
*Edit* Almost forgot... One other thing I noticed... When I advance the throttle the butterfly opens normally as expected... However, as I move to full throttle the butterfly goes BEYOND horizontal (full open) and continues on till it's probably close to half way shut again... Is this normal or is this yet another adjustment I need to make???
Can someone please try their best to explain all of the adjustments and which order they should be done in? You have no idea how much I would truely appreciate it!
Thanks in advance...
Greg
