Hi I just bought my first cylinder mower- a Rover Scott Bonnar 45. Am pleased to join the club !
The mower started fine from the bloke I bought it from- but when I got it home it wont start. Not even a cough or splutter. I have been wading through these forum pages and have a reasonable knowledge now. What a fantastic resource !
Model number is 91202 0123 01 92100103- so i guess it was built in 1992 on 1 October?
I think this is the parts list listed below in attached files.
I will replace the spark plug tomorrow and see if that helps. As far as I can tell it works fine already but it is quick cheap replacement and rules out one possible cause of failure to start..
While I am doing that I will try the "1/2 teaspoon of petrol in the piston chamber" trick and see if that helps.
Will try drain the fuel as well.
One thing I have noticed is that when the throttle is moved from choke to fast to off the governor spring mechanism doesnt seem to change position much, in that although the linkages move the actual movement of the linkage into and out of the engine doesn't really move position much at all. It also doesnt look like the governor spring is stretching much at all. It seems to need replacement.
On page 18 of the above parts link it seems to say that the spring is part number 211 or 691289. That said, on page 24 there is also a governor spring (which looks more like the one already on my machine- it is quite long and thin and has a full loop on one end) labelled part 419- but the corresponding BS part number isn't given as far as I can tell. And then on page 25 of the parts list there is another governor spring listed - parts 692522. Any ideas which one I should buy? Perhaps I should just take the old spring and the engine number to the local mower store and hope for the best!
Happy to post pictures if thought useful.
Any idea if the repair manual for this model can be obtained online?
