Well was stripping my bike down weekend fitting new electronic ignition sammy miller seat unit ect just need to get a wes exhaust now and I'd. Be happy but getting to the point I thought I'd count the teeth on the front sprocket and its a 11 and the rear sprockets a 41 to me I'm thinking this is why the bike felt terrible to ride up hills ect can sum one give me advise and how would that gearing compare to a 12 51 ?

41/11 is 3.73 to 1, 51/12 is 4.25 to 1. The higher the number the more revs are needed to move the same distance, hope that makes sense

Standard gearing is 13/51 but elsewhere on here, looks like most go 11/51 but anywhere around there would be better than present setup,looks like it would have been used more on road than of road,with the present gearing.

11/51 I find to be the best for trials work. I have tried 10/51 and found that it was to low,lots of revs in 1st gear but gives you 3rd gear on some of the hills. Your bike seem to be geared for the road. But then what is the bike used for?