Richard Shead
Slipped Anchor
Just all lean forward!!!! trust me on this one, if I am wrong I shall double the beer allowance on the stand at sbs for all forum members!
Has anyone come across this before?
- Thread starter andyangler
- Start date
andyangler
New member
yes as i turn,and will check all this great advice and let you know 2morrow,hope this works and its not something expensive!!!
Firefly625
Well-known member
[ QUOTE ]
Just all lean forward!!!! trust me on this one, if I am wrong I shall double the beer allowance on the stand at sbs for all forum members!
[/ QUOTE ]
oooh, I do hope you are right /forums/images/graemlins/smirk.gif /forums/images/graemlins/smirk.gif /forums/images/graemlins/smirk.gif /forums/images/graemlins/smirk.gif
Just all lean forward!!!! trust me on this one, if I am wrong I shall double the beer allowance on the stand at sbs for all forum members!
[/ QUOTE ]
oooh, I do hope you are right /forums/images/graemlins/smirk.gif /forums/images/graemlins/smirk.gif /forums/images/graemlins/smirk.gif /forums/images/graemlins/smirk.gif
RobWales
Active member
No way Jose!
IMHO /forums/images/graemlins/grin.gif
I'll have a case of Stella on it with you Rich?
IMHO /forums/images/graemlins/grin.gif
I'll have a case of Stella on it with you Rich?
DavidJ
Well-known member
If it was fuel there would be a delay in speed drop when straightening up while the carb is emptying. I sence from your description it's pretty much instantaneous...or is it?
Mr Googler
Well-known member
I had a very similar problem. It will be the throttle cable link on the carb i reckon. When you turn right you are pushing the engine towards the cable thus giving it more fuel. My cable mounting was cracked so wouldnt advanced fully when going straight or left. Quick cable tie and all better.
With the cover off and engine off push the throttle lever forward and see if it opens the carb right up to the stop or if theres any play.
Best of luck!! /forums/images/graemlins/grin.gif
With the cover off and engine off push the throttle lever forward and see if it opens the carb right up to the stop or if theres any play.
Best of luck!! /forums/images/graemlins/grin.gif
seamaster30
New member
I don't know the engine but assume it's got more than one cylinder - could it be a HT lead shorting out so the engine is not firing on all cyliders, but when turning left the cable moves and stops shorting?
Cliveshep
Well-known member
From what you say the reduction in speed with the helm over one way as opposed to the other can only be a function of the mechanical movement of the the engine in relation to the boat. That is why others immediately suggested a kink in fuel line. My own addition to that was a developing break in the wiring harness, by which I mean the cables going to the ignition/start switch which I assume is remote from the engine on a console elsewhere on the boat. Movement of engine moves cables allowing internal fraying or stress damage due to the constant steering movement to manifest itself in poor circuitry in one position.
There are other things that can cause an engine to have reduced revs as steering rotation is applied, perhaps flexing of the engine on its mounts chafes a wire, crimps a fuel line. I suggest that, having now rejected the logical explanations of crimping of fuel line and eliminated those you now examine the effects on all components under the cowling of engine steering movement because logically, as that is causing your problems, you ought to be able to hypothesise the effects of high speed turns on the engine with a little imagination. For example, applying centrifugal force to a component, what are the effects?
There are other things that can cause an engine to have reduced revs as steering rotation is applied, perhaps flexing of the engine on its mounts chafes a wire, crimps a fuel line. I suggest that, having now rejected the logical explanations of crimping of fuel line and eliminated those you now examine the effects on all components under the cowling of engine steering movement because logically, as that is causing your problems, you ought to be able to hypothesise the effects of high speed turns on the engine with a little imagination. For example, applying centrifugal force to a component, what are the effects?
Lakesailor
New member
I've read all the responses.
It won't be weight distribution.
It's most unlikely to be a blocked or kinked fuel pipe (doesn't the motor have 3 carbs? If so any improvement or lack of performance will be "deadened" by the effective reservoir of fuel you are carrying at the powerhead) The only situation I can see this happening is if, like the Johnson70, the carbs load up from the top and the top cylinder is being starved until fuel pressure is restored. Is the primer bulb hard or soft when it's running slow. Does pumping the bulb have any eefect. Does turning the steering move the fuel pipe enough to open a small air leak in the line?
I'm wondering about the cable harness and possibly multiplug side.
Does it have a default "safe" mode it drops to in the event of overheat or low oil pressure? Could it be a short to earth or break in the cable that goes to the warning buzzer in the remote causing it to drop to safe mode?
Does it have a warning buzzer than sounds when you put the key in? Try turning the steering when the buzzer is sounding. Does it falter?
Unfortunately big outboards can be very complex things to trouble-shoot.
Try here http://forums.iboats.com/showthread.php?t=319775
It won't be weight distribution.
It's most unlikely to be a blocked or kinked fuel pipe (doesn't the motor have 3 carbs? If so any improvement or lack of performance will be "deadened" by the effective reservoir of fuel you are carrying at the powerhead) The only situation I can see this happening is if, like the Johnson70, the carbs load up from the top and the top cylinder is being starved until fuel pressure is restored. Is the primer bulb hard or soft when it's running slow. Does pumping the bulb have any eefect. Does turning the steering move the fuel pipe enough to open a small air leak in the line?
I'm wondering about the cable harness and possibly multiplug side.
Does it have a default "safe" mode it drops to in the event of overheat or low oil pressure? Could it be a short to earth or break in the cable that goes to the warning buzzer in the remote causing it to drop to safe mode?
Does it have a warning buzzer than sounds when you put the key in? Try turning the steering when the buzzer is sounding. Does it falter?
Unfortunately big outboards can be very complex things to trouble-shoot.
Try here http://forums.iboats.com/showthread.php?t=319775
burgundyben
Well-known member
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throttle linkage / cable issue.
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throttle linkage / cable issue.
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Richard10002
Well-known member
We're waiting with baited breath for the outcome of todays testing /forums/images/graemlins/smile.gif
andyangler
New member
sorry guys but with very heavy rain and wind today did not think it a good idea to test the boat today,however am going down there first thing in the morning.after so much good advice i wounder who is going to be right?Will let you all know as soon as i get back.thanks alot...andy
realslimshady
Member
got to be throttle linkage-any reults yet?
Mr Googler
Well-known member
Im dying to know too. I keep checking back....sad I know. Where are you AndyAngler!!! /forums/images/graemlins/grin.gif
JKay
New member
[ QUOTE ]
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throttle linkage / cable issue.
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you are so right its that
Richards going to be buying doubles /forums/images/graemlins/smirk.gif /forums/images/graemlins/smirk.gif /forums/images/graemlins/smirk.gif
[ QUOTE ]
throttle linkage / cable issue.
[/ QUOTE ]
[/ QUOTE ]
you are so right its that
Richards going to be buying doubles /forums/images/graemlins/smirk.gif /forums/images/graemlins/smirk.gif /forums/images/graemlins/smirk.gif
andyangler
New member
Hi all,managed to get out today and try a few things,And i am happy to say the winner is.....Richard!Completly took everything off the boat and check what was let was balanced out nice and got a mate to go up front and bang!straight up to 23knts in a straight line.I would like to thank everybody for all your help and advise and nice one richard.
JKay
New member
you could have lied to get us all the /forums/images/graemlins/smirk.gif /forums/images/graemlins/smirk.gif /forums/images/graemlins/smirk.gif
I also think it should do more than 23 knots with your motor
with a 50 four stroke a Norman 20 on the Norman boats appreciation society website used to get 25 knots
lastly a big well done to Mr Shead /forums/images/graemlins/cool.gif
I also think it should do more than 23 knots with your motor
with a 50 four stroke a Norman 20 on the Norman boats appreciation society website used to get 25 knots
lastly a big well done to Mr Shead /forums/images/graemlins/cool.gif
andyangler
New member
Going to get a new tacho and see if i can down size my pitch on the prop,maybe this will help with that?
Mr Googler
Well-known member
That is a turn up! Well done to Richard but unless he can give a technical brief on this norman phenomonum then he should still make with the beers /forums/images/graemlins/grin.gif
Richard Shead
Slipped Anchor
Being an ex Thames broker I am an expert at getting boats of a certain age up onto the plane.....
This story was all too familiar! and I take no joy in submitting the winning suggestion....
So I guess I am being bought all the beers at SBS then?
This story was all too familiar! and I take no joy in submitting the winning suggestion....
So I guess I am being bought all the beers at SBS then?