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Re: CV carbs best jetting?
Posted: Fri May 06, 2011 11:28 am
by vanzen
I was never one to buy into the "aftermarket claim" of needing a larger main due to a muffler swap.
The advice just does not often play out very well.
Described is an essentially stock '81 large valve engine –
Why change stock jetting ?
main – 160
needle jet – 2.66
jet needle – # 46-341
needle position - #3 (I have used #2 with better throttle response and economy on my engine)
idle jet – 45
Re: CV carbs best jetting?
Posted: Fri May 06, 2011 11:40 am
by Rapid Dog
...sorry for my ineptness vanzen, but what's "jet needle – # 46-341" mean?
Looking thru the MAX fische I only see one slide needle available. That what you mean?
I get the rest.
Re: CV carbs best jetting?
Posted: Fri May 06, 2011 11:48 am
by Garnet
That is the Bing number for the needle on the slide of the carb.
Re: CV carbs best jetting?
Posted: Fri May 06, 2011 12:47 pm
by Major Softie
BMW only offers one needle as being "correct" for that model, but Bing has many needles that will fit the carb.
Re: CV carbs best jetting?
Posted: Fri May 06, 2011 1:01 pm
by vanzen
Rapid Dog wrote:...sorry for my ineptness vanzen, but what's "jet needle – # 46-341" mean?
Looking thru the MAX fische I only see one slide needle available. That what you mean?
I get the rest. :?:
"46-341" is listed in the BMW Repair Manual to describe the jet needle,
and the BMW RM was my source for stock jetting.
I see that Bing identifies the same needle for the 1981 R100RS simply as "341".
241, 251, and 371 jet needles are also listed by Bing as used on other BMW models.