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Old 03-10-2012, 09:47 AM   #1171
SOLO LOBO OP
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Spring has sprung, time to get on with it isn't it.

  • Speedo with Wirespokes for a rebuild due to the broken cable land
  • KTM front-end custom springs on and ready to ride!
Today's project is to address something that has long been on my mind. When I rebuilt the carbs initially, after the long lay-up I didn't replace the needle jet and jet needle. There is some wear, that is hard to see in the picture, but take my word for it, there is a shiny spot.

Carb off



Shiny jet needle



Assorted parts



And testing my new toy, a ~$30 Harbor Freight heated ultrasonic cleaner just big enough for most of a Bing.... running water/simple green at about 2:1

Start:




After the first of two runs:





Now, off the the dealer for parts including jet needles (46-251), needle jets (2.66), a few new orings etc
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Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
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Old 03-11-2012, 05:21 PM   #1172
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Carbs done, but realized that the cables need to be re-routed as the KTM clamps position the bars higher, and as I have to remove the bars I should just make the new Headlamp buckets mounts as they suck....

more delays!
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Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
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Old 03-11-2012, 09:22 PM   #1173
supershaft
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Definitely time for new jets! You know that I am always advising to run things lean and mean but a lot of bikes that came set up with 266's run better with 268's. "EPA" bikes don't need richer mains and although they are jetted much closer to best power than many of the seventies bikes they sometimes can still make more power with smaller mains. It's the needle jets where they are actually too lean. Just a tad bit. It says in both the Bing and Sudco manuals that the needle jets are key and they really are!
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Old 03-12-2012, 08:06 AM   #1174
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so what's the p/n for the 268 and the best place to source them??? BWM or Bing?
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Old 03-12-2012, 10:29 AM   #1175
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The best place for bing parts is the bmw dealer. But you can't just ask for such and such a jet. They won't know what you're talking about - they'll ask what your bike is and sell you the jets for it.

What you have to do is find out what bike used those jets, look up the part number and order them.

I don't know for sure if the jets are interchangeable for the 32 and 40mm bings, but think they are.
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Old 03-12-2012, 10:55 AM   #1176
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Quote:
Originally Posted by Wirespokes View Post
The best place for bing parts is the bmw dealer. But you can't just ask for such and such a jet. They won't know what you're talking about - they'll ask what your bike is and sell you the jets for it.
That's my exact experiece last weekend... they didn't know anything but what the computer told them, and the needle itself isn't marked... I asked which size it was and the parts guy had no idea.... just a part number.

Hopefully the needles didn't get mixed up by the person putting the stock away!

FYI the factory repair manual's number for the needle jet is not 2.66, but that is what was in my bike and what SS says came in all the US G/S's
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Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
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Old 03-12-2012, 11:03 AM   #1177
supershaft
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I don't know if all US G/S's came with 266's or not but I do know that a lot of bikes that came with 266's run better with richer needle jets from R65's to R100's.
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Old 03-12-2012, 12:22 PM   #1178
One Less Harley
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well you guys are no help at all.....
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Old 03-12-2012, 12:26 PM   #1179
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Quote:
Originally Posted by One Less Harley View Post
well you guys are no help at all.....
The needle jets are stamped with the size... head on in to your local dealer and ask to look through what they have.... I'd bet the 268 would be right by the 266's
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Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
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Old 03-12-2012, 12:30 PM   #1180
One Less Harley
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Looking in the Clymer it list #268's for the R90/6 and 1979 R100S/R100RS/R100RT. Part numbers are all different though, couldn't be that easy.


Like my dealer will have Bing parts in stock...., plus an hour away
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One Less Harley screwed with this post 03-12-2012 at 12:38 PM
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Old 03-12-2012, 12:47 PM   #1181
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Quote:
Originally Posted by One Less Harley View Post
Looking in the Clymer it list #268's for the R90/6 and 1979 R100S/R100RS/R100RT. Part numbers are all different though, couldn't be that easy.


Like my dealer will have Bing parts in stock...., plus an hour away
My local BMW dealer is the Harley dealer. Don't complain. It could be worse.

Tom
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Old 03-12-2012, 02:59 PM   #1182
supershaft
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Quote:
Originally Posted by One Less Harley View Post
Looking in the Clymer it list #268's for the R90/6 and 1979 R100S/R100RS/R100RT. Part numbers are all different though, couldn't be that easy.


Like my dealer will have Bing parts in stock...., plus an hour away
Just about any dealer is not going to have needle jets in stock but they could be there in a matter of days. VOR order them if you need them tomorrow. The jet sizes are listed with the PN's in the ETK. All the individual jet sizes have the same BMW PN regardless of what bike they come in. Look up the PN and order them. It's really not that complicated and the prices are cheaper through BMW. You can get 264 through 270 jet needles through BMW. 260 - 264 and 270 - 274 you have to get through Bing. Only one jet needle is available for each CV carb type from Bing or BMW. You might be able to get 274's through BMW? I don't remember for sure off hand.
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Old 03-12-2012, 03:28 PM   #1183
One Less Harley
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I did look at what the Clymer has for needle #'s, and then compared the bikes listed in my earlier post and saw different p/n's for what I assumed should have been the same. The Clymer list the 268 for only 1979 on the R100S/RS/RT, the fishce doesn't differentiate the years as it groups it to 77-84.

The R90/6- #268 is p/n 13111255840

while the R100RS #268 is p/n13111338691
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Old 03-12-2012, 03:42 PM   #1184
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Quote:
Originally Posted by One Less Harley View Post
I did look at what the Clymer has for needle #'s, and then compared the bikes listed in my earlier post and saw different p/n's for what I assumed should have been the same. The Clymer list the 268 for only 1979 on the R100S/RS/RT, the fishce doesn't differentiate the years as it groups it to 77-84.

The R90/6- #268 is p/n 13111255840

while the R100RS #268 is p/n13111338691
I just looked them up. The PN is 13 11 1 260 971 for 268 needle jets regardless of which bike. The ETK lists the jet size right beside the PN. Use Max BMW, not an old fische. I hope that helps!
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Old 03-12-2012, 04:10 PM   #1185
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talking to the Bing factory guy made me Leary... they said to replace mid range jet/needle every 30k miles. I'm getting 54 mpg going easy on throttle. 42mpg medium to light throttle and 33 mpg normal balls to the wall throttle.

the Bing guy couldn't dispute any R80G/S getting 54 mpg doesn't need new needle/jets. that is after recommending I buy a set of needles and mid jets.
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