Just came back from my first ride after "needle shim mod"

David Bo · 04-12-2009, 04:01 PM

Wow, I really felt the difference... I shimmed my needle earlier this weekend and turned my carb's bottom screw open about a half turn (after drilling out that little metal plug). I cut the airflow restricter off of my existing air filter and opened up the holes in my muffler a from 1/4" to about 3/8" to relieve some additional back pressure. It feels like these mods added "at least" a couple of ponies to the engine. I can't wait to install the new exhaust next weekend. I am also planing on installing a K&N filter to replace the cut-up factory one.

It is pretty cold in New England today so I only went about 8 miles before my face started to freeze. Thanks for all the "How to's" guys!!! :cool:

04-12-2009, 04:01 PM	#1
David Bo Member Join Date: Apr 2009 Location: Northbridge, MA Posts: 96	Just came back from my first ride after "needle shim mod" Wow, I really felt the difference... I shimmed my needle earlier this weekend and turned my carb's bottom screw open about a half turn (after drilling out that little metal plug). I cut the airflow restricter off of my existing air filter and opened up the holes in my muffler a from 1/4" to about 3/8" to relieve some additional back pressure. It feels like these mods added "at least" a couple of ponies to the engine. I can't wait to install the new exhaust next weekend. I am also planing on installing a K&N filter to replace the cut-up factory one. It is pretty cold in New England today so I only went about 8 miles before my face started to freeze. Thanks for all the "How to's" guys!!! :cool: Login or Register to Remove Ads
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