|
|
Post by David Worsley on Apr 4, 2024 16:08:17 GMT
I have recently acquired this machine, I find it difficult to start, I have spark and fuel the compression reads as being 75 lbs, is that sufficient?
|
|
|
|
Post by davwat on Apr 6, 2024 18:50:01 GMT
I have recently acquired this machine, I find it difficult to start, I have spark and fuel the compression reads as being 75 lbs, is that sufficient? I'm no expert on compression testing (or anything else) but apparently testing compression on a 2 stroke is not as relevant as a 4 stroke when it would be checking the valves. With 2 strokes there is also crankcase compression which is important but doesn't show up with a compression test. Not much help really! just saying. |
|
|
|
Post by David Worsley on Apr 24, 2024 18:09:11 GMT
An update- according to 'The book of the Raleigh Moped by R H Warring, compression readings are as follows-
RM 4 and 6......6.5:1
RM 5, 11 and 12....All are 9:1
RM 8 and 9 7.5:1.
I am assuming that the extra power was achieved by modifying the cylinder head and/or piston-Hope this is of use/interest to someone.
|
|
|
|
Post by davwat on Apr 24, 2024 18:17:10 GMT
An update- according to 'The book of the Raleigh Moped by R H Warring, compression readings are as follows- RM 4 and 6......6.5:1 RM 5, 11 and 12....All are 9:1 RM 8 and 9 7.5:1. I am assuming that the extra power was achieved by modifying the cylinder head and/or piston-Hope this is of use/interest to someone. That's a different kettle of fish! The compression ratio in an internal combustion engine refers to the degree of compression that the fuel mixture undergoes before ignition. It is defined as the maximum volume of the combustion chamber (with the piston farthest out, or at bottom dead center) divided by the volume with the piston in the full-compression position |
|
