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Old 24 January 2015, 11:39   #1
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Yamaha VETO 40 Help please!

Hi all.
My yam starts straight away off the key but when the auto choke cuts down, when the throttle is opened it dies straight away. My opinion is when the choke is on, its revving its tits off but when its on non choke tickover, it is about right albiet a little 'lumpy'.
The engine had been stood since july and ive only just bought it. ive changed to brand new petrol and the breather on petrol tank does work (even taken lid off to make sure!)
Any help or advice please?
P.S. its a 1995 motor
Thanks, Daz
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Old 24 January 2015, 12:36   #2
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It's a red herring. The auto choke gives it 30 seconds of additional fuel. The chances are your carbs require to be cleaned out. If you have had the choke off the carbs there are two tiny o rings. If you lose either you will get the same symptoms.

Check spark

Check fuel pump

Clean carbs.

It will be one of the 3. If you have spark it is not CDI.
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Old 24 January 2015, 12:55   #3
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Thank you RIB Techie! ive not touched the carbs at all, ive just blown out the fuel filter with airline, and its working a lot better but its not perfect! would a good run down the river help clear it out or isnt that the way?
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Old 24 January 2015, 13:35   #4
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bit of an update. Its revving better, but whilst ticking over every 5 seconds or so, seems to miss a beat with quite a squeak of something metallicaly rubbing or catching.?
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Old 24 January 2015, 13:37   #5
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The chances are this is a slow running problem, so there is every chance you wi cut out on the river. I would drain the carbs down and retry. Then I would strip them
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Old 24 January 2015, 13:39   #6
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Found the drain screws. blowing them with air line as well. ..
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Old 24 January 2015, 13:58   #7
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The squeak may well be a blown bottom crank seal. Very common. The block will have to come off for that and you must not run it in water as it will track up the crankshaft.
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Old 24 January 2015, 14:15   #8
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Second everything Rib teccie has said.
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Old 24 January 2015, 14:56   #9
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Its now parked up and drained of water. it was only run in a water tub and not continuously at power.. workshop here she comes. Thankyou very much for advice techie,!
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Old 24 January 2015, 15:40   #10
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RIB Techie, would you have an idea in how hard a job it would be to replace the crank seals or how much roughly it would cost to do the repair please?
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