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  Please, imperatively read the following information before you order a Yamaha system from us.
  • None of our systems supports a possibly existing electrically driven exhaust valve control!
  • the full (lighting support) systems  (they have in parts number a 799) work only up to 10.000 revs/min. The sports systems with internal rotor work till 22.000
  • there have not only been quite a few different ignition systems, some of them aftermarket, there exist also different crankshafts, demanding differently shaped ignition systems. We here describe the main issues where you can recognise what you have and need.
RD where the rotor is bolted to the crank by screw M7
(with originally points)		 RD where the rotor is bolted to the crank by nut 
(with  originally CDI ignition)
  
1976 RD250C & RD400C   1977 RD250D & RD400D The rotor on these models is retained with a 7mm bolt From 1978 all RD250/400’s (with CDI ignition) had the rotor retained with a nut, these models are commonly known as 1978 RD250E & RD400E 1979 RD250F & RD400F as well as (for Germany) G models. All these models have CDI ignition systems and the flywheel is retained by a nut
Please note: in some RD 400 (sorry we do not know which 400 models are concerned) with stock points we got several times problems with the dynamo cover after our system 71 05 799 was fitted.
With this type of shaft there is no uncertanty as to which of our systems will fit Unfortunately of this type of crankshaft with threaded end exist 2 different versions. Different in length of shaft
Our systems fitting those engines are shorter shaft longer shaft

For more   see below
Our systems fitting those engines are
  • 71 06 599
  • 71 06 799

    Remark:
    we quite often get orders 
    for 7106 where customer actually 
    needed 7113. so check carefully
 Our systems fitting those engines are
distinction between the two is not easy and needs close scrutiny of the shaft.
Distinction between the 2 different shaft types with threaded shaft end
shorter shaft with nut longer shaft with nut
The length of the shaft from bottom level of base plate (engine support) to end of taper (start of threading) is ca 42mm.

 

 The length of the shaft from bottom level of base plate (engine support) to end of taper (start of threading) is ca 51mm.

 
we think this is in all RD E TZ F/G/350H and LC (1978) we think this is in all liquid cooled RD from after 1985 and the YPVS the case, also in Banshee engines.
Distinction between the 2 nut mounted versions is not easy, when you have only one of then in front of you, but checking the above shaft dimension should give clear indication.

The pictures here illustrate what happens when you actually need a 71 13 x99 but got a 71 06 x99: the rotor sits out of limits.
If the reverse happens, the rotor bottoms out and can not be fastened.