PHF32 Float needles

A

andre

Senior member
Gents

My LH spark plug has become wet while the bike is just sitting! I suspect a leaking fuel tap, and maybe a leaking lh carb float needle. I'll fix the fuel tap. I cant remember if I replaced float needles when I rebuilt those carbs (wish I'd just bought RS36's). Wagner's website (and Eurobike in NZ) list various size needle and seat combinations. I thought one just replaced the needle.
So what size needle/seat do I need? 270 or 300?

Thanks
Andre
 
Crank the engine with the wet plug out to clear any fuel in the cylinder. You don't want hydraulic lock.

Also, change the oil. If your cylinder has been full enough to get the plug wet, chances are that fuel has leaked past the rings and diluted the sump oil.

Cheers,
Cam
 
Cam - I'll crank engine and replace oil.

Tom - you say 2.50, you mean 250? 270 available off the shelf here in NZ. That should do huh (I see Wagner lists a 300)?
When I rebuilt the carbs I mustn't have done the needles coz I'd have remebered having to buy floats AND seats. I must be remembering my Triumph days with Amals where it's needles only (I think).

I struggle to see how fuel runs thru a stationary carb (and engine) and ends up on the plug. Capillary action?
 
hi Andre - The 250 size is original fitting - we used the 300's on our 1200 tuned motors to ensure constantly adequate fuel flow under all conditions - the 270's will be fine if that's all you can get - HTH - Phil
 
Paul Marx said:
You can also try a bit of fine grinding paste between float valve and seat.
Ciao
Paul
Click to expand...


   :o :o :o :o

   They only cost 17 quid each and I 'm not sure how well grinding paste works with Viton. Replace the set Andre. Go on, I change them all during a carb overhaul, they should be considered a wearing part.


      Keith.
 
Hah. I guess the grinding paste good idea was a prod about me being so cheap as to suggest I'd buy only one. Was just kidding. 3 already ordered. They're a bit less than 17 pounds here too Keith.
My Motodd tank has no fuel line filters, and I think there may be crud in the solenoid-operated fuel taps, so I've lashed out and ordered one $8 in-line filter as well (it's all I could find). Stock taps are inaccessable on my mk3 tank so I have these silly electric things.

Cheers, Andre
 
what Marxy joking?
he is so tight himself that he would not piss on his own turnups even if they were on fire !!
CLEM

sorry Paul
 
Very careful cranking the engine with plugs out to get rid of gas in a cylinder.  had used the method you proposed of using the starter to turn over the engine probably a hundred times without incident on old snowmobiles and no problems. Not so lucky on the RGS.  Sparkplug wires should be grounded with a spark plug on electronic ignitions when cranking the engine. This obviously causes a spark which ignites the gas and burns your skin and the wiring harness right above the plug.......still have the scars. Hot engine temp and air temp make a big difference if the gas vaporizes and explodes or not. Much safer to remove plugs and push bike, engage rear wheel to turn engine to expel gas.
 
laverdakeith said:
Paul Marx said:
You can also try a bit of fine grinding paste between float valve and seat.
Ciao
Paul
Click to expand...


   :o :o :o :o

   They only cost 17 quid each and I 'm not sure how well grinding paste works with Viton. Replace the set Andre. Go on, I change them all during a carb overhaul, they should be considered a wearing part.


      Keith.
Click to expand...

Well lapping in, even with rubber tips (!) is only a get you there solution . It's a bit of a shame laying a bike up whilst waiting for float needles.

ciao a tutti
Paul
 
well fuel taps didnt seem to be leaking, but I'll add in line fuel filters anyways.
And the float needle and seat on lh carb was a 300 size. Must have been to supply the 175 mains it had when I bought that bike... Condition looks ok.
I've got 270 needle/seats on the way, so will install them.

Tsk. What next. This bike like an errant teenager (I got 2).

Regards, Andre
 
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