Date: 28-03-24  Time: 13:25 pm

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Falcon 269

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Re: Investigation: Carbs Overflowing - Fuel into Engine?
« Reply #25 on: 20 January 2018, 06:53:32 am »
I wouldn't bother with resetting the float heights, Mitch.  Only worth doing if you're fitting one of Ivan's kits. 

If it ain't broke, don't dick with it. :)

Mitch

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« Reply #26 on: 21 January 2018, 03:22:41 pm »
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« Last Edit: 10 June 2019, 05:22:06 pm by Mitch »

Falcon 269

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Re: Investigation: Carbs Overflowing - Fuel into Engine?
« Reply #27 on: 21 January 2018, 04:23:26 pm »
Hi Mitch,

Yes, I've come across a few pinched diaphragms.  Not a problem so long as they're not actually punctured.  Refit carefully and that's that. :)

Leave the pressed in brass components alone other than checking for obvious blockages.

Before you go altering the lone float height, the one you suspect has a bent tang, check it against the others by sighting along the line of the floats when they're at the correct position for checking/setting their heights.  You can do this by putting one end of the carbs on the bench and by angling the bank towards you so that the carbs are about 30 degs to the bench.  Tilt the entire bank gently to get the floats hanging completely clear of the needle valves.  Now rotate them back the other way carefully until they just stop moving.  That's the position to compare alignment.  If you continue to rotate the carbs further, you should see the floats move again as they overcome the spring pressure in the needle valves and settle completely.

Indeed odd that one float pivot should be shorter than the rest but at least you have replacements to hand. :)


Mitch

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« Reply #28 on: 21 January 2018, 09:00:36 pm »
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« Last Edit: 10 June 2019, 05:22:15 pm by Mitch »

Falcon 269

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Re: Investigation: Carbs Overflowing - Fuel into Engine?
« Reply #29 on: 21 January 2018, 09:28:48 pm »
Mitch,

You might want to check the markings on the needles and the size of the main jets, just in case someone has tried a DIY rejetting job.

Needles should have SD-130 or SD-129 stamped around the top.  Main jets should be 130 and 132.5.

Mustang

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Re: Investigation: Carbs Overflowing - Fuel into Engine?
« Reply #30 on: 22 January 2018, 06:50:52 pm »
Think that stray washer should be under the clip on the needles as it's designed to lift it up a bit not on top

Mitch

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« Reply #31 on: 22 January 2018, 08:14:57 pm »
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« Last Edit: 10 June 2019, 05:21:43 pm by Mitch »

Falcon 269

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Re: Investigation: Carbs Overflowing - Fuel into Engine?
« Reply #32 on: 22 January 2018, 09:16:20 pm »
Hi Mitch

All stock parts and settings for a pre-2003 model.  Well, mid-2003 to be precise but that's trivia. ;)

I'd reassemble using the 3mm spacers which was how Yamaha shipped the Fazer from mid-2003 onwards.  It was their way of addressing the lean surge issues which affected the earlier versions of the bike.  You will still need one 0.5mm shim below the spacer and another on top of the e-clip to act as a seat for the needle retaining spring.

Set the mixture screws to 3.5 turns out and call it good for now. :)


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« Reply #33 on: 22 January 2018, 09:32:47 pm »
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« Last Edit: 10 June 2019, 05:21:53 pm by Mitch »

Mitch

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« Reply #34 on: 28 January 2018, 06:47:30 pm »
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« Last Edit: 10 June 2019, 05:22:29 pm by Mitch »