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TECHNICAL INFORMATION FUNCTION OF CARBURETOR PARTS, RS125R / RS250R Basic functions of each part         Jet needle   Application of jet needle depends on which carburetor you are using, So please use appropriate jet needle for your carburetor. Jet needles in Fig(1) and (2) has different length and tapered angles. Using in appropriate jet needles will cause trouble.               Comparing taper angle α1 α2 α3 (1) 12••/34(33)66/2351/1159 1°24' 2°39' 1°15' (2) R12••N(M)-1157D 1°24' 3°15' 1°15'           Comparing length mm A B C D (1) 12••/34(33)66/2351/1159 66 58.9 46.9 30.3 (2) R12••N(M)-1157D 65 56.9 46.9 32.8     (1) for carburetor with PWJ (2) for PJ short carburetor (Unleaded fuel)           The difference between 34 (standard) needle and 33 (option) needle for power jet carburetors is that the 33 needle is 0.5mm shorter at the raise of tapers than the 34 needle. That is, the 33 (option) is 0.5 step richer than the 34 (standard) if comparison is made in the same step. Likewise, in the case of PJ carburetor without power jets, the M (option) is 0.5 step richer than the N (standard)             Redline Powersports provides the above information as a courtesy; it is the reader's responsibility to confirm the accuracy and applicability of all information before performing any of the discussed adjustments, modifications, procedures, etc; furthermore, the implementation of any of the discussed adjustments, modifications, procedures, etc is done at the sole risk of the reader.  Redline Powersports does NOT warranty or guarantee in any way the information discussed in it's "Technical Information" pages or elsewhere.  Redline Powersports disclaims all responsibility for consequential and incidental damages or any other loss arising from the use of ANY information provided by Redline Powersports and/or it’s vendors, suppliers, contractors, etc. irrespective of how caused. PRIVACY CONTACT TERMS OF SALE SEARCH HOME COPYRIGHT 2003-2013, Technical Sports One: ALL RIGHTS RESERVED