Bogging question Evinrudee 140 looper

[zymox]

Hello folks, long time no seen. I hope everything is fine with you guys.

My engine has always bogged on me when I gave it more than half throttle and it hasn't really bothered me since half gas is more than enough. Lately it has started to develop a good amount of struggle when I have tried to fire it up. Also idling was impossible for more than 5 minutes. Removed the carb cover and a really serious leak was discovered out of my upper left Carb overflow line. A rebuild with a new needle and a seat also a quick adjustment of the floater and it fired right up, runs without any smoke after 10 secs. and runs pretty smooth.
Question: Could this also has been the problem for stalling, sometimes if I'm really quick, it could be saved alive if I pulled down the throttle. I figured out in my mind that this has to be a lean fuel prob. situation but since I'm not able to test it out of the harbor the coming week I thought I could ask here if someone has noticed something similar before pointing in the direction of that this also could be my bogging problem?

Thanks in adv. BRGDS Zymox

 

[Joe Reeves]

Re: Bogging question Evinrudee 140 looper

Bogging, that is having the engine hesitate or die out when throttle is applied is caused by:

1 - Butterflies opening too soon in relation to the timing.
2 - Somewhat clogged high speed jets which are located horizontally in the bottom center portion of the float chambers.
3 - Having the timer base (spark advance) under the flywheel sticking when the throttle is advanced.

It's usually the clogged high speed jets.

 

[zymox]

Re: Bogging question Evinrudee 140 looper

Thans for your reply Joe.
Yeap, I have figured out that I have to check my mains 1:st and found out today where to find them I looked for them when I fixed my floater valve but couldnt locate em. It have been a half throttle engine for a while and the other day I almost couldn't give any throttle at all before it starts to bogg out, right after changing to my sec. fueltank so I'm pretty sure it's due to dirt in the main jet.
I will come back here if this doesn't do the trick.

 

[zymox]

Re: Bogging question Evinrudee 140 looper

Well, back again I hope I don't asks to much...

Took my carbs apart for cleaning and they was like new inside. I hoped for some sag but there was nothing at all. I used some compressed air to every channel and in every jet. 3 in total/carb. 1 was markt 16 and the 2:nd was markt 28 also the main markt D61. Nr.1 was placed in the upper whole and the nr:2 in the lower. D61 in the same hole as the drain plug. It starts in an instant and it can idle all day long, also there is no hesitation when I rev it in neutral. If i put her in gear at idle rpm letting it pull the strings attached to the boat for parking it stalls after a few seconds. five-ten... She didn't do that yesterday...

I think I've done a test when I got the motor. I'm almost sure that it was something you wrote about how to test/set the advance on starter-rpm. I will recall that it was spot on to your description. Haven't touched the adv. since.

Still have some wanderings though,
How much movement to the handle am I supposed to engage for the motor to react? -I can move my warm up handle about 30-40% before anything happens and when it does the engine starts to rev and increases the revs until I lower the handle? On zero level it's down to idle rpm. If I then rise the handle again nothing happens until the 30-40%. Also the butterflies doesn't move until about 40-50% but my revs does increase some before. I think I might have my controls adjusted wrong due to this but since this is my first boat I haven't really given it much thoughts.

Also, when are the butterflies supposed to move? I mean, are we talking about that the ignition advance arm is supposed to move about a cm before engaging the butterflies? Is this arm suppose to move right away when I put it in gear? I have a bad copy of the workshop-book but I don't get it from the book. Your explanation form was much more easy to understand. Short and consist.

Sorry to bother you with my bad English and this but I know a lot of 4-strokes car or motorcycle engine but 2 stroke boats are way different in controlling. I don't get along with the system of 2-strokes even if know the basics pretty good with the crankcase/reeder, spooling, port timing vs valves, ignition timing - I have to learn all over again but without intake - exhaust valves and cams.

hmm. I did read the procedure again in my book and figured it out that there is no easy fix for this. I'll try to fix as much as I can cording to the book and let you hear from me if I get stuck...

 

[zymox]

Re: Bogging question Evinrudee 140 looper

Hello again Joe. Thank you for your answers above, much appreciated.

Impatient as I am I went down to the boat to day and with the no:2 in mind I changed the fuel pump. Now, this could have been my trouble all the time... I need about 3-4 engages for a cold start but with the new pump... well look at the video... It's only a couple of minutes and I hope this has been the problem. I looked at my ignition scale for and I have done a mark at 14 degrees sometime in the past meaning 18 degrees on the run. I couldn't test it out on the sea today cause it was to windy but as soon as the weather gives me a chance. I also tried to move the butterflies without moving the ignition and the motor stops almost right away.

[video]http://www.zymtech.se/motor_comp.wmv[/video]

 

[Joe Reeves]

Re: Bogging question Evinrudee 140 looper

Note that the throttle cam roller should be approximately 3/8" in diameter. Some of those rollers have a hard inner black core with a clear covering over that core. That clear covering has been known to break away leaving the roller something like 1/8" or 3/16" in diameter which really screws things up. Check the diameter of your roller and replace if needed.

The throttle butterflies should just start to open when the scribe mark on the cam is dead center with the throttle cam roller... not before or after.

The warm up lever operation... yes, I know what you're speaking of. Some of those setups leave a lot to be desired due to the play in the mechanism.

 

[zymox]

Re: Bogging question Evinrudee 140 looper

I will absoluetly do that sir. Thank you very much for you time and effort. As I said before, your way of how to instruct what to do is way more easy than that darn book. Why coludn't they just tell it like that.. Brgds, zymox

 

[Joe Reeves]

Re: Bogging question Evinrudee 140 looper

Your way of how to instruct what to do is way more easy than that darn book. Why couldn't they just tell it like that.. Brgds, zymox

What... make it that easy? Now, surely you jest.