Wierd carb problem. (Bing CV)

JamesJWeg · 09-05-2004, 07:38 AM

Now that we airhead junkies got a place to play. My R100RT sports it's stock Bing carbs, and around the 100,000 mile mark it started snapping ether the main jet needle itself or the clip which holds it in the slide. Both carbs are doing this and I am only getting 2 - 3 K miles on each needle. Right now I am loosing one about every 1K because first it's one side, then it's the other. It's getting really old and I can't seem to find any answers, anyone know what's up? It's bad when you are preping for a weekend ride and you make sure you got two sets of needles and clips cause it's likly that you'll break more than one in two days.

James.

a_k_nicholls · 09-05-2004, 01:57 PM

Sounds to me like as the piston is lifting the needle up its kicking ever so slightly sideways & loading up the needle & eventually causing it to snap.

Check how much movement is in the piston as either the bore or piston itself is probably worn.

arroyoshark · 09-05-2004, 06:20 PM

No bling-bling Bing...!

Frank Warner · 09-05-2004, 06:23 PM

When was the last time you cleaned out the carbys ... could be some crud at the bottom of the needles' hole. Got some oil blow by? Then you will have crud. Unless you reroute the breather.
Oh, you better find the problem and fix it before something finds it way to the inlet valve!

JamesJWeg · 09-05-2004, 06:46 PM

Quote:

Originally Posted by Frank Warner

When was the last time you cleaned out the carbys ... could be some crud at the bottom of the needles' hole. Got some oil blow by? Then you will have crud. Unless you reroute the breather.
Oh, you better find the problem and fix it before something finds it way to the inlet valve!

Cleaned the jet stack, pulled it and dissasembled it, nothing, looks fine, no trash at all, I got twin inline paper element autotype fuel filters post tank, and got no trash from blow by, that plumbing's a little differant now

. um, the motor has eaten several c clips

no harm done, I've pulled the jugs and checked. When I take it apart early it seems like there must be a lot of extra movement somewhere as the c clip ring is worn loose, it will wear till the whole shoulder is gone and it drops. So where do I look for wear and who can get me specs of what size those parts should be?

James.

Frank Warner · 09-05-2004, 07:24 PM

Ummm... some advise replacing the seat along with the needle as they both ware together.

Is it the clip or its seat that is worn? ... If your have put in new clips and they are dropping out then I'd be looking at
1) the seat ... means you need a new piston $$ ...
2) the clip ... you certain you are gettting the correct clip?

... good puzzle ... may be the best place is the airhead list for this. Good Luck.

09-05-2004, 07:38 AM	#1
JamesJWeg ^OP "Speedy" Joined: Dec 2003 Location: Edgefield, SC Oddometer: 1,736	Wierd carb problem. (Bing CV) Now that we airhead junkies got a place to play. My R100RT sports it's stock Bing carbs, and around the 100,000 mile mark it started snapping ether the main jet needle itself or the clip which holds it in the slide. Both carbs are doing this and I am only getting 2 - 3 K miles on each needle. Right now I am loosing one about every 1K because first it's one side, then it's the other. It's getting really old and I can't seem to find any answers, anyone know what's up? It's bad when you are preping for a weekend ride and you make sure you got two sets of needles and clips cause it's likly that you'll break more than one in two days. James. __________________ Hold my beer and watch this! http://pics.jamesjweg.com 00100

09-05-2004, 01:57 PM	#2
a_k_nicholls Gnarly Adventurer Joined: Oct 2003 Location: Near Canberra Australia Oddometer: 291	Sounds to me like as the piston is lifting the needle up its kicking ever so slightly sideways & loading up the needle & eventually causing it to snap. Check how much movement is in the piston as either the bore or piston itself is probably worn. __________________ Said by a very brave soul " Lets Roll & Remember To Burn Rubber Not Your Soul " Words of wisdom Give big space to the festive dog that makes sport in roadway. Avoid entanglement of dog with wheel spokes. Go soothingly on the grease mud, As there lurks the skid demon. Press the brake foot as you roll around the corners, And save the collapse and tie up. F650GS Dakar in Australia

09-05-2004, 06:23 PM	#4
Frank Warner Traveller Joined: Mar 2002 Location: Sydney, Australia Oddometer: 6,593	When was the last time you cleaned out the carbys ... could be some crud at the bottom of the needles' hole. Got some oil blow by? Then you will have crud. Unless you reroute the breather. Oh, you better find the problem and fix it before something finds it way to the inlet valve! __________________ Regards Frank Warner motorcycles BMW R80 G/S 1981, BMW K11LT 1993, BMW K75 G/S http://www.geocities.com/fwarner_au/

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09-05-2004, 06:20 PM	#3
arroyoshark Needing some space Joined: Oct 2003 Location: Fin del Sendero, NM Oddometer: 2,127	No bling-bling Bing...!

09-05-2004, 07:24 PM	#6
Frank Warner Traveller Joined: Mar 2002 Location: Sydney, Australia Oddometer: 6,593	Ummm... some advise replacing the seat along with the needle as they both ware together. Is it the clip or its seat that is worn? ... If your have put in new clips and they are dropping out then I'd be looking at 1) the seat ... means you need a new piston $$ ... 2) the clip ... you certain you are gettting the correct clip? ... good puzzle ... may be the best place is the airhead list for this. Good Luck.