Senior VR Member
Join Date: Jul 2008
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Depends what is wrong with it.
Cam chains, tensioner and guides are about $700 in parts, another $400-$600 in labor.
Removing the engine and replacing worn parts for low compression or oil leaks is around $1500 in parts and another $1000 in labor. Once you refresh the top end, you MUST also address the crank, crank journals, wrist pins and other connectors in the bottom end which is usually about another $1000 parts & labor (if the crank can be machined. If not, that's another $600 alone).
Which is why most people A: Do not rebuild these engines or B: pick up a used engine from a salvaged bike and have it installed.
Used engines will run from $900-$1500 depending on the year and accumulated miles. If you swap it over yourself, it takes a few hours and requires several floor jacks. If you pay a shop to do it, they usually charge $500 to do the job.
The underlying engine block is the same from 2001 to 2019. What changed is the charging system and the upper cylinders. If you want plug and play, you have to get a 2005-2008 C50 or M50 engine. If you don't want to be limited, you can get any year and swap the stator, regulator, coils, cylinder heads and intake, along with the needed electronics.
You've got some options, but nothing is really cost effective when you consider the resale value of the bike.
Current Bikes -->
-1969 Indian MX125 -10-2009 to Present
-2014 Honda CTX1300 - 05-2015 to Present
Past Bikes ----->
-1973 Yamaha RD350
-1991 Harley Sportster 883 XL
-2000 Yamaha XV125
-2003 Piaggio Fly
-2004 Suzuki LS650 - 04-2005 to 07-2008
-2005 Boulevard C50 - 07-2008 to 5-2012
-2012 Vulcan 900 - 05-2012 to 05-2015
-2008 Yamaha FZ6 - 11-2008 to 04-2017
-2006 Star Virago - 05-2011 to 06-2017