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Classic Bike Trackdays

5 weeks into my AR125 project
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The Cameraman



Joined: 22 Aug 2015
Posts: 608
Location: Lancashire

PostPosted: Sun Sep 11, 2016 2:45 pm    Post subject: Reply with quote

Hi Howie,

thanks for your reply.

I didn't try blowing through the carb, upside down, so I'll give that a go.

The float does have a 'tang' but everything was working OK until she's been off the road whilst doing the engine work. I had a quick look and the height appears OK.

The float doesn't have signs of any leaks and when I removed it there was no fuel in either side.

The fuel filters are fine, as is the tank.

Curious eh!

To me that fact that it was OK until parked up for a while would be an indication to something sticking open but I'll give the blow test a go.
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Reggie
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Top-shaggy
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Joined: 05 Mar 2011
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Location: Derbyshire

PostPosted: Sun Sep 11, 2016 7:25 pm    Post subject: Reply with quote

Hi Reggie

Agree with Howie comments and suggestions

Leak from overflow at Base of bowl is the drain plug not sealing..this is separate to float issues

Float needs to be set correctly which it sounds like you have done

Float valve notorious for leaking. . Either from seat or failed washers above the float valve

Does it only leak when engine not running and left standing ?

Is the fuel tap sealing when it's turned off (another common fault after years of crud..). Does the carb still leak when tap off?

It's probably something so simple ... not really AR thing, all carbs can act up like this..can be so annoying
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The Cameraman



Joined: 22 Aug 2015
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PostPosted: Sun Sep 11, 2016 9:28 pm    Post subject: Reply with quote

Hi Shaun,

thanks for your reply.

It leaks when the engine is not running.

The fuel tap works OK.

The carb continues to dribble when the tap is closed or even with the fuel pipe removed.

I'm also guessing it may be the seating or the washers.

I cleaned what I could with Brasso but it looks like it may be time for more accurate cleaning, or even new float valves etc?
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The Cameraman



Joined: 22 Aug 2015
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PostPosted: Tue Oct 11, 2016 8:23 pm    Post subject: Reply with quote

Hi Guys n Gals,

so I decided to give the carb a proper clean out, to see if that sorts out the leak, so I gave it a good king over in my ultrasonic cleaner and it's come up a treat!

I still need to remove the main jet yet, so I'll do that tomorrow but here's a shot of what 15 minutes in an ultrasonic, warm bath does.



Regards

Reggie
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PostPosted: Tue Oct 11, 2016 9:12 pm    Post subject: Reply with quote

Hi Reggie

Worth pushing out the jet nozzle as they usually have numerous small holes in the stem that can get blocked over the years.

Hope it all works well once its rebuilt. Fingers crossed Smile
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The Cameraman



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PostPosted: Tue Oct 11, 2016 9:14 pm    Post subject: Reply with quote

Hi Shaun,

I was trying to but it's absolutely solid!

I'll give it a go without that, just in case I knacker it eh.

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Reggie
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PostPosted: Tue Oct 11, 2016 9:42 pm    Post subject: Reply with quote

Fair enough mate.

One thing for certain, the jet nozzle is not the cause of the leaking carb
More likely the float valve and float level. Hope all goes well.
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The Cameraman



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PostPosted: Tue Oct 11, 2016 9:53 pm    Post subject: Reply with quote

Hi Shaun,

cheers matey.

Fingers crossed eh.

Trust you'll be at Stafford on Saturday?

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Reggie
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The Cameraman



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PostPosted: Tue Dec 06, 2016 9:26 pm    Post subject: Reply with quote

Hi Guys n Gals,

well the AR50 carb's sorted but the AR125's carb just doesn't want to play the game!

Re-cleaned all the pars, jets etc and all is good.

Adjusted the float height, so I know that's correct.

If I blew over the float valve, it seals fine.

Re-assembled the carb and connected it to a temp fuel tank, at the same height difference when compared with the normal tank and let the fuel run in.

If I hold the carb vertical it's OK, if I lean it to one side (beyond the lean angle when on a normal corner) it then runs out of the side (as you'd expect) but if I lean it the other way, it starts to run from the overflow point before it starts to run from the upper side connection!

If I gently shake the carb, to simulate the movement of a bike, then there's a very small dribble from the overflow but as soon as I lean it enough to equate to a side stand lean angle, it then starts to dribble!

So, as a test I took a float valve from one of my Serows and fitted that (adjusted to the correct height) and you've guessed it, it still leaks!

At this rate I may just fix a tube to the overflow point and seal it up!

It's driving me mad!

Any idea's or will I go round the bend?
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PostPosted: Wed Dec 07, 2016 6:50 pm    Post subject: Reply with quote

Two suggestions Reggie

First the brass housing that seats the float valve but from what you say it sounds like it's not this?

Second the floats over time can deteriorate and not 'float' as well as new sometimes this can be spotted if you can see cracking to the floats or fuel standing in one of the float units?

Not much more I can think of at the min.. hmm
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The Cameraman



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PostPosted: Wed Dec 07, 2016 7:04 pm    Post subject: Reply with quote

Hi Shaun,

when I gently blow into the brass housing, with the valve in place, nothing gets past it and there's no obvious signs of damage to the floats but I'll remove the float bowl, fill it with fuel and see if the floats actually float!

If that doesn't trace any faults, I may even consider fitting a replacement carb!
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