Author Topic: Bore size of 2 3/4hp model W  (Read 1909 times)

0 Members and 1 Guest are viewing this topic.

Offline Lat Fuller

  • Full Member
  • **
  • Join Date: Jul 2014
  • Posts: 34
  • Location: Perth Western Australia
Bore size of 2 3/4hp model W
« on: 09 Jun 2016 at 04:43 »
Can anyone help in letting me know what the original bore size of the 350cc Model "W" was.   I cannot for the life of me find this in any of my literature !  My present bore measures 62mm, but I am sure this was not standard..
Any assistance appreciated.

Offline Black Sheep

  • Full Member
  • **
  • Join Date: Jan 2012
  • Posts: 104
  • Location: South Lanarkshire
Re: Bore size of 2 3/4hp model W
« Reply #1 on: 09 Jun 2016 at 05:35 »
According to the Identifying your Douglas section, model W should be 61mm bore. Does yours still have cast iron pistons?

Offline eddie

  • Master Member
  • ****
  • Join Date: Mar 2006
  • Posts: 1656
  • Location: Hampshire, UK
Re: Bore size of 2 3/4hp model W
« Reply #2 on: 09 Jun 2016 at 06:11 »
Almost all the 2 engines had a bore of 60.8mm - only the pre 1913 veteran engines had smaller bores (60.0 mm) and were listed as being 340cc. As I understand it, the bores were 'size' and the running clearance was allowed for on the pistons.
  Regards,
               Eddie.

 

motorcycle