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Old 19 December 2010, 08:07   #11
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Originally Posted by davis View Post
I am in the south east, thanks for the advice MOS , stripped the carb again today cleaned and blew it out , changed the oil , put back together and it started and ran for a while then I turned it off. Tried to start again and no go so maybe what you are saying may be the problem , but the engine is not in warranty anymore so probably no hope of a new carb from them. I was going to try the fuel line and pump next to see if there is any dirt in there ,other than that I dont know , but the fact that it started and run it must be a fuel problem.
These engines are not easy to get at everything seems to be packed in around each other.
OK, It does sound like the issue is the carburetor. The dealer you should have bought it from should help as it is a known Yamaha fault... Even out of warranty. We used to just change the complete carb for a new one and it did solve running issues. I have also known people to drill the main jet out slightly which improves the engines performance as it allows for fuel to mix with the air.

Also, try this:

Try putting a brand new BR6HS NGK plug in.

Remove carb again, completly strip it down including top heat shield with white plastic dowel. Allow the carb to be submerged in fresh petrol for a good 24 hours. Then blow out with a 100PSI + Air line...

Thirdly, reset the pilot screw... Some F4 carbs allow you to change the pilot screw but others (newer models) had blanking plates so you couldn't. If yours is not blanked off then you will need to create a special tool (half mooned screw driver) to screw the pilot out 1.5/8 turns +/- 1/4 ...

Hope this helps

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Old 19 December 2010, 16:17   #12
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4 yam

Send me your serial number and I will log onto dealer system and see what I can do for you if you wish.I will even have a few carbs lying around. a ULTROSONIC CLEAN WILL SORT THAT CARB OUT.I run the machine every week in the test room and it does do the job
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Old 19 December 2010, 20:38   #13
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I'm curious, what goes so drastically wrong that it makes fitting a new carb a regular fix?

I looked at a Yamaha for my aux, quite glad I didn't go for that option now!
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Old 20 December 2010, 15:31   #14
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Fitting a new carb seems a bit extreme, A proper strip down and an ultrasonic clean should do the trick.
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Old 20 December 2010, 15:37   #15
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how is an ultrasonic clean done ,is there a special machine, if so I will need to bring it to a professional
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Old 20 December 2010, 15:47   #16
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Its an ultrasonic bath the carb goes in, just like the jewler uses to clean jewellery, find a dealer who has one and post the carb to them or pop in if there is one close.
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Old 20 December 2010, 17:06   #17
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Originally Posted by BogMonster View Post
I'm curious, what goes so drastically wrong that it makes fitting a new carb a regular fix?

I looked at a Yamaha for my aux, quite glad I didn't go for that option now!
It's because the small yamaha engines are made in MBK (France) and are not made as well and as close to the Japanese tolerances... If you put the Jap version against the French one you would be surprised on how much better the Jap one is!

The F6 is a smashing engine though...! And the two-stroke Yamahas are bullet proof... Just the F4 that's a little dodge!

You can try cleaning it again or allow it to soak for a lengthy period in a fuel / ultrasound bath... But, If it persists then easier to replace carb for reliability purposes. My customers like reliability

www.mobileoutboardservices.com
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Old 20 December 2010, 17:07   #18
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Quote:
Originally Posted by BogMonster View Post
I'm curious, what goes so drastically wrong that it makes fitting a new carb a regular fix?

I looked at a Yamaha for my aux, quite glad I didn't go for that option now!
It's because the small yamaha engines are made in MBK (France) and are not made as well and as close to the Japanese tolerances... If you put the Jap version against the French one you would be surprised on how much better the Jap one is!

The F6 is a smashing engine though...! And the two-stroke Yamahas are bullet proof... Just the F4 that's a little dodge!

You can try cleaning it again or allow it to soak for a lengthy period in a fuel / ultrasound bath... But, If it persists then easier to replace carb for reliability purposes. My customers like reliability

www.mobileoutboardservices.com
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Old 20 December 2010, 17:09   #19
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I don't know why it has Posted twice... I do apologize!
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Old 22 December 2010, 01:32   #20
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carb

I would be more than happy to ULTROSONICALLY CLEAN that little PUPPY for you and set it up. I have all the special gear to do this aswell as a INJECTOR CLEANING SERVICE for Optimax Mercury ,Yamaha and the other brands.A ultrosonic clean should sort it.If you put it in the post to me I will do it FREE for you.Im away after christams and then off to London Show so I might only beable to do it after that.
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