I am looking for owns manual for craftsman lt1000 lawn tractor model 917-271-731 ser.no. 012301B001491

try sears online or look on craigs list or tractor supply

Here ya go. Parts lists and diagrams for a 2003 LT1000

http://www.searspartsdirect.com/partsdirect/part-model/Craftsman-Parts/Riding-mower-tractor-Parts/Model-917272672/0247/1509200?pathTaken=&prst=0&shdMod=917272672

This OHV Briggs engine has a spark plug setting of .030". You can get a manual for your machine here.
http://www.searspartsdirect.com/partsdirect/part-model/Craftsman-Parts/Riding-mower-tractor-Parts/Model-917271653/0247/1509200?pathTaken=

You need the model number. Here is an example. 917274350http://www.managemylife.com/mmh/owner_manuals/27138/CRAFTSMAN-Lawn-Tractor-L0503410?brand_name_search=917274350+CRAFTSMAN

If this isn't your model number, go to www.searspartsdirect.com. Put in your model number, and when you get to the parts page, go to the right hand side and click button for manual

if you have a model # 917.272672, you can download a free user manual at

http://www.craftsmanlawn.com/Tractors-Riding-Lawnmowers/917.272673/

Go to craftsman website. They offer manuals, but you have to buy them.

Or; Look on ebay.

go to sears.com and you can get the manual and the parts you need.

find every part you need on amazon here Amazon com Craftsman LT1000 Parts . take a look and enjoy

The manual will cover it.

http://www.disruptit.com/manuals/L0104168.pdf