float valve leak - Can't find the problem

[ribbert]

.... Noel has already sent advice via PM and is not visible to the rest of the forum.

Randy - RPM

Haha, maybe on this occasion I should have, it included the photo below and detailed instructions, amongst other things.

Randy, barely a week goes by here without someone publicly acknowledging the advice you give via PM, email and even the phone, none of that's visible to the forum!


There's a funny story about that. A few years back I got a PM from a member in the US, Randy had rung him and talked him through whatever the problem was he'd posted about. He admitted, by way of explaining what brought him to me, that  he was so in awe at finding himself actually talking to Randy that he was rattled and remembered virtually nothing he said. It was as if he'd picked the phone and found God on the other end. He was amazed that Randy would spend his time ringing him and couldn't bring himself to impose even more on it by asking again, so he contacted me and asked if I could explain it to him.

I'm sure the slightly offensive circumstances and the the irony of suggesting Randy's time was more valuable than mine, but wanting my help, was lost on him.

Noel

[MOTOMYSZOR]

.....following Randy's "checklist" I discovered wear dimples on each float.... So big thanks Randy for Your checklist.

Did they look like this...



Noel

This same pattern but in my case wear was less severe. I used my blunt file and sandpaper 2500.
It looks like finally I am ready for test run 

Thank You all for help.

[racerrad8]

Now the question is: 20ml per night is acceptable or should I buy new floats?

Glad you found an issue and it helped with the leakage, but now to answer your question...

No, 20ml leakage overnight is not acceptable. Where is that fuel going?

Filling the bowls
Leaking out of the enrichment hoses
Weeping up into the carb throats

You need to find out where the fuel is leaking to ensure you don't accidentally hydraulic a cylinder.

Randy - RPM

[MOTOMYSZOR]

Prepare to be surprised......   

I noticed that petrol level in my auxiliary tank lowered down after all this tests.... more than it should.... So I marked petrol level and discovered that after every test I have to add 50-60 ml to keep it on this same level.

So last few days I spent looking  for a leak.... nothing. Carburetors body was bone dry...

I discovered that  silicon hose going from syringe to carburetors is always covered in some kind of condensation, like water, but it was to much and I decided to change it for other hose - thicker one.

After that change  from syringe disappeared less than 2 ml..... it looks like petrol was evaporating thru this silicone tube walls in rate 40-60 ml per day.

It took me 2 months to discover that main problem was f.... silicone tube...... 

[Pat Conlon]

Well now, I'll be a monkey's uncle.... (not you Mark)

[FJmonkey]

Well now, I'll be a monkey's uncle.... (not you Mark)

[MOTOMYSZOR]

I know how it sounds...... so I conducted small test.

as on photos: after 16 hours from syringe disappeared around 50 ml ......
Silicone tube is all covered in petrol.....

[Old Rider]

If you did that test in room temperature and had no lid on top of the syringe i think 99% of the fuel just evaporated into air.

[MOTOMYSZOR]

If you did that test in room temperature and had no lid on top of the syringe I think 99% of the fuel just evaporated into air.

Just finished another test. This same condition: my garden shed with temperatures 5C-8C with no sun.... Only this night was very windy so it added to evaporation rate.
From blanked syringe evaporated around 5-6ml after 12 hours and little bit more than 10 ml after 24h. So in 16 hours it was maybe 8ml.

[CutterBill]

I discovered that silicon hose going from syringe to carburetors...

Never use any type of silicone with gasoline. This includes RTV silicone.
Bill

[fj1289]

Well now, I'll be a monkey's uncle.... (not you Mark)

How long have you been waiting for that one?!

[FJmonkey]

How long have you been waiting for that one?!

I did not see that one coming, I had to search for it...