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Old 26 March 2005, 12:01   #1
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Yam 30 Problems

Hi All,

Wonder if you can help me out with this one..Outboard is a Yamaha 30 DEO (2stroke) built in '96 so getting on a bit, and lives on the back of a 4M Rescue type Searider.

On starting she fires runs for say about 10secs and dies..., on starting and using a bit of fast idle, I can get her to stay fast idling for about 2mins before it tails off and dies. Immediate issue I found, was that I was informed that the fuel was 6months old...so Im immediately assuming this is the problem, and will check 2moz with sum fresh, but just wondered whether any one has one of these engines or could offer up other possible issues..

Thanks..
Tom.
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Old 27 March 2005, 08:20   #2
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try the fuel lines

chack that the fuel pipe and tank are ok - to be sure that the tank is venting - and that it isnt drawing air into the fuel line
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Old 28 March 2005, 09:01   #3
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Just had this problem on a Yam 30 this weekend.

Proved to be a disintigrating fuel pipe that caused further problems in the filters and pumps etc.

Work methodically from the tank to to the carb checking each bit for a free flow of fuel, or air if your blowing through it and you should find the problem.

I don't think you engine is that old and shouldn't have any major problems if its been cared for.

We had problems with the pipe last year and it should have been replaced then.

Best of luck Nick R.
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Old 28 March 2005, 13:13   #4
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Rite, Fresh Fuel, now runs, thats the good bit...bad bit is shes very tempremantal, hunting for revs at idle and sound rather knocky, checked pplugs and clearance theyre all fine, fuel system has been fully cleaned and clean fresh fuel throughout..

Looks like shes gonna need a service,

Anyone know of anywher nr southampton where im not gonna get ripped ?

Tom.
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Old 28 March 2005, 14:58   #5
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They are kinda knocky. Does it rev if you open the throttle?
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Old 28 March 2005, 15:08   #6
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Yeah it does, almost sounds like its back firing, just been running it with sum muffs on, and appears to be coughing and spitting out evry say 8secs ish..

Bringing it back down to idle speed, she sits at idle happily for a min or 2, then starts chasing revs,.but going low not high..dips rite down to just above stall point, and then slowly pics up again...before finally dieing after about 8mins or so.
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Old 28 March 2005, 15:42   #7
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Adjust the tick-over mixture. Make it richer first. Sounds like it needs just a tad ¼ turn(ish) or less. These motors, when on muffs, can rev kinda crackly and then knock hard on over-run. Sound effect for you...brrrrrruummmmmm, dum, dum, dum, dum-dum, dum, dum-dum, dum, dum.......crackle, crackle, pop, knock, knock...
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Old 28 March 2005, 15:46   #8
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Yam probs

Might need a carb clean
Paul
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Old 28 March 2005, 15:53   #9
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I had rough running problems on the Yam 50 last week after the winter lying up - without draining carbs, etc... (see Yam 50 problems thread below)

The responses received recommended spraying the carbs with carb cleaner - which I duly did yesterday - and it certainly made a HUGE improvement....

what I did was - remove the air box from the front of the carbs, and applied carb cleaner very genorously to the outside of the ecarbs, including the pivots for the butterflies, and also to the inside of the carbs (down the throats) with the throttles owide opwn - and closed. I left it to dry off for about an hour - then I started the engine (in a barrel...) and gave a liberal spraying into each carb several times while the engines were running... The engine died several times - because of the rough running problem - but over the course of an hour or two - repeating the spray the carbs with the wngines off, working the throttles well to free them out - then running the engine and spraying the stuff into the carbs with the engines running - I could see/feel the difference - as the engine became less rough - and eventually settled down to a staedy tickover, etc...

I used amost a full can of cleaner - but it was definitely a good tip picked up from the forum...
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Old 28 March 2005, 16:46   #10
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Quote:
Originally Posted by jwalker
brrrrrruummmmmm, dum, dum, dum, dum-dum, dum, dum-dum, dum, dum.......crackle, crackle, pop, knock, knock...

an downt fergett de arrrrrrrrrgh az de propp slicis iz fkin tows offf.

gArf
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