Reply
 
Thread Tools Search this Thread
 
Old 06 May 2015, 09:04   #1
Member
 
Country: UK - England
Town: london
Boat name: bigrib
Make: unknown
Length: 6m +
Join Date: Aug 2010
Posts: 30
Yamaha 30 sticks in forward

Hi guys ... I wandered if anyone on here could maybe be of assistance :-)
I have just purchased a Yamaha 30 twin .. Single carb which needs a bit of tlc... I've fixed a few bits on it ph gasket leaking .. The gear lever bracket for the remote had snapped off so I've welded a little bracket up (in the same position) and tapped and bolted it to the casing .
Problem is this : starts ok , on tickover I can put it in forward neutral and reverse then I put it in forward (tied to a pontoon) give it full throttle then when it comes back to tickover it won't go in to neutral or reverse ... It's stuck in f
This is with the remotes off and manually operating everything...
Any ideas ? Many thanks in advance jim
__________________

__________________
jimjam is offline   Reply With Quote
Old 06 May 2015, 11:19   #2
Member
 
Country: UK - England
Town: london
Boat name: bigrib
Make: unknown
Length: 6m +
Join Date: Aug 2010
Posts: 30
Anyone have any ideas. ? :-)
__________________

__________________
jimjam is offline   Reply With Quote
Old 06 May 2015, 11:25   #3
RIBnet supporter
 
bartiny's Avatar
 
Country: UK - England
Town: Accrington
Length: no boat
Join Date: Oct 2012
Posts: 451
Check gearbox oil
__________________
bartiny is offline   Reply With Quote
Old 06 May 2015, 11:56   #4
Member
 
Country: USA
Town: S. Carolina
Boat name: D560
Make: Avon
Length: 5m +
Engine: 2016 Merc 115hp CT
Join Date: Aug 2013
Posts: 1,121
Does it stick in reverse as well?

Might be a misadjusted / misaligned shaft, or there is something wrong inside the lower unit.

Gear oil was a good point!
__________________
Richard
Gluing geek since 2007
office888 is offline   Reply With Quote
Old 06 May 2015, 13:50   #5
Member
 
Country: UK - England
Town: london
Boat name: bigrib
Make: unknown
Length: 6m +
Join Date: Aug 2010
Posts: 30
Yes... There is gear oil in it ... Changing it was next on my list ... Didn't look that dirty ...
I didn't try reving it up much while in reverse ... It only sticks in gear after I've revved it up :-/
__________________
jimjam is offline   Reply With Quote
Old 06 May 2015, 14:49   #6
Member
 
spartacus's Avatar
 
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,270
RIBase
Read this. Lots of pictures and thorough explanation.
Outboard stuck in forward - Yamaha Outboard Parts Forum
__________________
Is that with or without VAT?
spartacus is offline   Reply With Quote
Old 06 May 2015, 16:06   #7
Member
 
Country: UK - England
Town: london
Boat name: bigrib
Make: unknown
Length: 6m +
Join Date: Aug 2010
Posts: 30
Thanks Spartacus .. Very informative ... It may be my upper shift linkage ... I just read another post somewhere where a guy said if you take the leg off make sure when it goes back the lower leg must be in reverse and the gear selector must also ... I have a feeling this may not have been the case ... I shall be investigating tomorrow :-) thanks for your help jim
__________________
jimjam is offline   Reply With Quote
Old 06 May 2015, 19:50   #8
Member
 
Country: UK - England
Make: Humber / Phantom
Length: 5m +
Engine: Lots of Yamahas
Join Date: Feb 2006
Posts: 137
Not sure about the not wanting to shift when revved up, but in general the 20/25/28/30hp twin cylinder Yamahas can suffer from a damaged upper gear linkage.

The gear change shaft runs horizontally under the tray between the tray and the leg and has a lever (part number 38 in link below) fixed onto it which operates the vertical shift rod running down the leg to the gearbox. This lever has a pin pressed into with an interference fit it which and can become bent or loose. The damage normally occurs by trying to undo the long brass nut connecting the vertical shaft to the gearbox - if this nut is seized then the twisting motion on the vertical shaft damages the pin / lever. This leads to sloppy gear changes and the engine not wanting to come in and out of gear. The only way to fix this is to lift the powerhead off the leg - actually only a ten minute job - and then lift the tray off which will reveal the gear linkage which can then be inspected.

I have seen them bodged with a nut and bolt in the past but never really satisfactory - needs to be a new part in my opinion - I used to do a fair few of these with this problem as a Yamaha engineer in the 90's but they aren't as common as they once were, which is a shame as they are a better engine than the twin carb autolube 20D/25N and the 30hp triple, but then I always preferred the older Origin / Enduro engines. I still have an original points ignition 1976 28A in storage, no use for it and no value to it but will still be running long after all the later four strokes with questionable Mercury derived electrics have died!
__________________
phantom 19 is offline   Reply With Quote
Old 07 May 2015, 02:35   #9
Member
 
Country: UK - England
Town: london
Boat name: bigrib
Make: unknown
Length: 6m +
Join Date: Aug 2010
Posts: 30
Phantom 19 thanks for such an in detailed reply ... There is no substitute for experience i shall be working on the engine first thing Friday morning ! As for these engines... I feel such a great simple lightweight design has been ditched which is such a shame ... I rely on a boat every day to get to land .. (2actually) .. Re to the 28 you have ... If you wanted to part with it I would be very interested :-) thanks for your time . James
__________________
jimjam is offline   Reply With Quote
Old 07 May 2015, 03:13   #10
Member
 
Country: UK - England
Make: Humber / Phantom
Length: 5m +
Engine: Lots of Yamahas
Join Date: Feb 2006
Posts: 137
This was the link I forgot to paste in the reply. Part number 38 is the usual culprit.

OEM Parts)

It won't allow a direct link but click - outboard motors - 1984 - 25etln - engine control.
__________________

__________________
phantom 19 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 04:23.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.