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Reference => Douglas Motorcycle Technical Articles => Topic started by: trevorp on 27 Jun 2005 at 14:16

Title: Misfire at high speed on mk 1
Post by: trevorp on 27 Jun 2005 at 14:16

had an interesting problem with a mk 1 engine running a mn1 magdyno
could not get engine to run properly after checking carbies etc
what i found was the points and drive fitted seem to be from something else
i have pictures as i was so baffled i pulled out my points as my bike was running well and compared the two have a look at where the keyways are placed on both units the one on the left is the correct one for a mk douglas
and the shoe size is smaller
life lesson number 1 not everything u get on your bike is origanal lol


(https://www.douglasmotorcycles.net/aa-files/images/trevorp/2005/douglas%20008_or-cr-420w-PI32.jpg)

Larger view here (https://www.douglasmotorcycles.net/aa-files/images/trevorp/2005/douglas%20008_or-cr-1000w-PI32.jpg)


(https://www.douglasmotorcycles.net/aa-files/images/trevorp/2005/douglas%20009_or-cr-420w-PI32.jpg)

Larger view here (https://www.douglasmotorcycles.net/aa-files/images/trevorp/2005/douglas%20009_or-cr-1000w-PI32.jpg)

Title: Re: Misfire at high speed on mk 1
Post by: tck on 23 May 2007 at 15:01

what i found was the points and drive fitted seem to be from something else


Looks like a Vellocette unit to me

Title: Re: Misfire at high speed on mk 1
Post by: eddie on 23 May 2007 at 16:10

Hi trev,
             It looks as if you have one points assy from a Lucas mag and the other  from a BTH.
                       regards,
                                       Eddie.

Title: Re: Misfire at high speed on mk 1
Post by: trevorp on 24 May 2007 at 07:38

no eddie was correct bth and wrong direction