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I have a lot of different questions about this rebuild Im doing on this '99 Foreman trx400fw Im redoing. The biggest is are the Foremans interchangeable. Like, can I strip down the top end and put a 450 or 500 Foreman top end on the 400 crank.And these size 11 wheels gotta go. Will the 12's go right on.
 

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I have a lot of different questions about this rebuild Im doing on this '99 Foreman trx400fw Im redoing. The biggest is are the Foremans interchangeable. Like, can I strip down the top end and put a 450 or 500 Foreman top end on the 400 crank.And these size 11 wheels gotta go. Will the 12's go right on.
Well, let's see;
The crankshaft was the same for:
1995 TRX400FW A - PISTON / RINGS / CRANKSHAFT /
1995 TRX400FW AN - PISTON / RINGS / CRANKSHAFT /
1996 TRX400FW A - PISTON / RINGS / CRANKSHAFT /
1996 TRX400FW AN - PISTON / RINGS / CRANKSHAFT /
1997 TRX400FW A - PISTON / RINGS / CRANKSHAFT /
1997 TRX400FW AN - PISTON / RINGS / CRANKSHAFT /
1998 TRX400FW A - PISTON / RINGS / CRANKSHAFT /
1998 TRX400FW AC - PISTON / RINGS / CRANKSHAFT /
1998 TRX450ES A - PISTON
1998 TRX450ES AM - PISTON
1998 TRX450S A - PISTON
1998 TRX450S AM - PISTON
1999 TRX400FW A - PISTON / RINGS / CRANKSHAFT /
1999 TRX450ES A - PISTON
1999 TRX450S A - PISTON
2000 TRX400FW A - PISTON / RINGS / CRANKSHAFT /
2000 TRX450ES A - PISTON
2000 TRX450S A - PISTON
2001 TRX400FW A - PISTON / RINGS / CRANKSHAFT /
2001 TRX450ES A - PISTON
2001 TRX450S A - PISTON
1995 TRX400FW A - PISTON / RINGS / CRANKSHAFT /
1995 TRX400FW AN - PISTON / RINGS / CRANKSHAFT /
1996 TRX400FW A - PISTON / RINGS / CRANKSHAFT /
1996 TRX400FW AN - PISTON / RINGS / CRANKSHAFT /
1997 TRX400FW A - PISTON / RINGS / CRANKSHAFT /
1997 TRX400FW AN - PISTON / RINGS / CRANKSHAFT /
1998 TRX400FW A - PISTON / RINGS / CRANKSHAFT /
1998 TRX400FW AC - PISTON / RINGS / CRANKSHAFT /
1998 TRX450ES A - PISTON
1998 TRX450ES AM - PISTON
1998 TRX450S A - PISTON
1998 TRX450S AM - PISTON
1999 TRX400FW A - PISTON / RINGS / CRANKSHAFT /
1999 TRX450ES A - PISTON
1999 TRX450S A - PISTON
2000 TRX400FW A - PISTON / RINGS / CRANKSHAFT /
2000 TRX450ES A - PISTON
2000 TRX450S A - PISTON
2001 TRX400FW A - PISTON / RINGS / CRANKSHAFT /
2001 TRX450ES A - PISTON
2001 TRX450S A - PISTON
2002 TRX400FW A - PISTON / RINGS / CRANKSHAFT /
2002 TRX450FE A - PISTON
2002 TRX450FM A - PISTON
2003 TRX400FW A - CRANKSHAFT / PISTON
2003 TRX450FE A - PISTON
2003 TRX450FM A - PISTON
2004 TRX450FE A - PISTON
2004 TRX450FM A - PISTON

The front crankcase half was the same for:
1995 TRX400FW A - CRANKCASE
1995 TRX400FW AN - CRANKCASE
1996 TRX400FW A - CRANKCASE
1996 TRX400FW AN - CRANKCASE
1997 TRX400FW A - CRANKCASE
1997 TRX400FW AN - CRANKCASE
1998 TRX400FW A - CRANKCASE
1998 TRX400FW AC - CRANKCASE
1998 TRX450ES A - CRANKCASE
1998 TRX450ES AM - CRANKCASE
1998 TRX450S A - CRANKCASE
1998 TRX450S AM - CRANKCASE
1999 TRX400FW A - CRANKCASE
1999 TRX450ES A - CRANKCASE
1999 TRX450S A - CRANKCASE
2000 TRX400FW A - CRANKCASE
2000 TRX450ES A - CRANKCASE
2000 TRX450S A - CRANKCASE
2001 TRX400FW A - CRANKCASE
2001 TRX450ES A - CRANKCASE
2001 TRX450S A - CRANKCASE
2002 TRX400FW A - CRANKCASE
2002 TRX450FE A - CRANKCASE
2002 TRX450FM A - CRANKCASE
2003 TRX400FW A - CRANKCASE
2003 TRX450FE A - CRANKCASE
2003 TRX450FM A - CRANKCASE
2004 TRX450FE A - CRANKCASE
2004 TRX450FM A - CRANKCASE

The rear crankcase half was the same for:
1995 TRX400FW A - CRANKCASE
1995 TRX400FW AN - CRANKCASE
1996 TRX400FW A - CRANKCASE
1996 TRX400FW AN - CRANKCASE
1997 TRX400FW A - CRANKCASE
1997 TRX400FW AN - CRANKCASE
1998 TRX400FW A - CRANKCASE
1998 TRX400FW AC - CRANKCASE
1998 TRX450ES A - CRANKCASE
1998 TRX450ES AM - CRANKCASE
1998 TRX450S A - CRANKCASE
1998 TRX450S AM - CRANKCASE
1999 TRX400FW A - CRANKCASE
1999 TRX450ES A - CRANKCASE
1999 TRX450S A - CRANKCASE
2000 TRX400FW A - CRANKCASE
2000 TRX450ES A - CRANKCASE
2000 TRX450S A - CRANKCASE
2001 TRX400FW A - CRANKCASE
2001 TRX450ES A - CRANKCASE
2001 TRX450S A - CRANKCASE
2002 TRX400FW A - CRANKCASE
2002 TRX450FE A - CRANKCASE
2002 TRX450FM A - CRANKCASE
2003 TRX400FW A - CRANKCASE
2003 TRX450FE A - CRANKCASE
2003 TRX450FM A - CRANKCASE
2004 TRX450FE A - CRANKCASE
2004 TRX450FM A - CRANKCASE

The head is different, the cylinder is different, the camshaft is different, but the cam followers (lifters) were the same for:
1995 TRX400FW A - CAMSHAFT
1995 TRX400FW AN - CAMSHAFT
1996 TRX400FW A - CAMSHAFT
1996 TRX400FW AN - CAMSHAFT
1997 TRX250 A - CAMSHAFT
1997 TRX250 AC - CAMSHAFT
1997 TRX400FW A - CAMSHAFT
1997 TRX400FW AN - CAMSHAFT
1998 TRX250 A - CAMSHAFT
1998 TRX250 AC - CAMSHAFT
1998 TRX400FW A - CAMSHAFT
1998 TRX400FW AC - CAMSHAFT
1998 TRX450ES A - CAMSHAFT
1998 TRX450ES AM - CAMSHAFT
1998 TRX450S A - CAMSHAFT
1998 TRX450S AM - CAMSHAFT
1999 TRX250 A - CAMSHAFT
1999 TRX400FW A - CAMSHAFT
1999 TRX450ES A - CAMSHAFT
1999 TRX450S A - CAMSHAFT
2000 TRX250 A - CAMSHAFT
2000 TRX350FE A - CAMSHAFT
2000 TRX350FM A - CAMSHAFT
2000 TRX350TE A - CAMSHAFT
2000 TRX350TM A - CAMSHAFT
2000 TRX400FW A - CAMSHAFT
2000 TRX450ES A - CAMSHAFT
2000 TRX450S A - CAMSHAFT
2001 TRX250 A - CAMSHAFT
2001 TRX250EX A - CAMSHAFT
2001 TRX350FE 2A - CAMSHAFT
2001 TRX350FE A - CAMSHAFT
2001 TRX350FM 2A - CAMSHAFT
2001 TRX350FM A - CAMSHAFT
2001 TRX350TE A - CAMSHAFT
2001 TRX350TM A - CAMSHAFT
2001 TRX400FW A - CAMSHAFT
2001 TRX450ES A - CAMSHAFT
2001 TRX450S A - CAMSHAFT
2001 TRX500FA A - CAMSHAFT
2002 TRX250EX A - CAMSHAFT
2002 TRX250TE A - CAMSHAFT / VALVE
2002 TRX250TM A - CAMSHAFT / VALVE
2002 TRX350FE 2A - CAMSHAFT
2002 TRX350FE A - CAMSHAFT
2002 TRX350FM 2A - CAMSHAFT
2002 TRX350FM A - CAMSHAFT
2002 TRX350TE 2A - CAMSHAFT
2002 TRX350TE A - CAMSHAFT
2002 TRX350TM 2A - CAMSHAFT
2002 TRX350TM A - CAMSHAFT
2002 TRX400FW A - CAMSHAFT
2002 TRX450FE A - CAMSHAFT
2002 TRX450FM A - CAMSHAFT
2002 TRX500FA A - CAMSHAFT
2003 TRX250EX A - CAMSHAFT
2003 TRX250TE A - CAMSHAFT / VALVE
2003 TRX250TM A - CAMSHAFT / VALVE
2003 TRX350FE 2A - CAMSHAFT
2003 TRX350FE A - CAMSHAFT
2003 TRX350FM 2A - CAMSHAFT
2003 TRX350FM A - CAMSHAFT
2003 TRX350TE 2A - CAMSHAFT
2003 TRX350TE A - CAMSHAFT
2003 TRX350TM 2A - CAMSHAFT
2003 TRX350TM A - CAMSHAFT
2003 TRX400FW A - CAMSHAFT / VALVE
2003 TRX450FE A - CAMSHAFT
2003 TRX450FM A - CAMSHAFT
2003 TRX500FA A - CAMSHAFT
2004 TRX250EX A - CAMSHAFT
2004 TRX250TE A - CAMSHAFT / VALVE
2004 TRX250TM A - CAMSHAFT / VALVE
2004 TRX350FE 2A - CAMSHAFT
2004 TRX350FE A - CAMSHAFT
2004 TRX350FM 2A - CAMSHAFT
2004 TRX350FM A - CAMSHAFT
2004 TRX350TE 2A - CAMSHAFT
2004 TRX350TE A - CAMSHAFT
2004 TRX350TM 2A - CAMSHAFT
2004 TRX350TM A - CAMSHAFT
2004 TRX400FA A - CAMSHAFT / VALVE
2004 TRX400FGA A - CAMSHAFT / VALVE
2004 TRX450FE A - CAMSHAFT
2004 TRX450FM A - CAMSHAFT
2004 TRX500FA A - CAMSHAFT
2004 TRX500FGA A - CAMSHAFT
2005 TRX250EX A - CAMSHAFT
2005 TRX250TE A - CAMSHAFT / VALVE
2005 TRX250TM A - CAMSHAFT / VALVE
2005 TRX350FE A - CAMSHAFT
2005 TRX350FM A - CAMSHAFT
2005 TRX350TE A - CAMSHAFT
2005 TRX350TM A - CAMSHAFT
2005 TRX400FA A - CAMSHAFT / VALVE
2005 TRX400FGA A - CAMSHAFT / VALVE
2005 TRX500FA A - CAMSHAFT
2005 TRX500FE A - CAMSHAFT
2005 TRX500FGA A - CAMSHAFT
2005 TRX500FM A - CAMSHAFT
2005 TRX500TM A - CAMSHAFT
2006 TRX250EX A - CAMSHAFT
2006 TRX250TE A - CAMSHAFT / VALVE
2006 TRX250TM A - CAMSHAFT / VALVE
2006 TRX350FE A - CAMSHAFT
2006 TRX350FM A - CAMSHAFT
2006 TRX350TE A - CAMSHAFT
2006 TRX350TM A - CAMSHAFT
2006 TRX400FA A - CAMSHAFT / VALVE
2006 TRX400FGA A - CAMSHAFT / VALVE
2006 TRX500FA A - CAMSHAFT
2006 TRX500FE A - CAMSHAFT
2006 TRX500FGA A - CAMSHAFT
2006 TRX500FM A - CAMSHAFT
2006 TRX500TM A - CAMSHAFT
2007 TRX250EX A - CAMSHAFT
2007 TRX250TE A - CAMSHAFT / VALVE
2007 TRX250TM A - CAMSHAFT / VALVE
2007 TRX400FA A - CAMSHAFT / VALVE
2007 TRX400FGA A - CAMSHAFT / VALVE
2007 TRX500FA 2A - CAMSHAFT
2007 TRX500FA A - CAMSHAFT
2007 TRX500FE 2A - CAMSHAFT
2007 TRX500FE A - CAMSHAFT
2007 TRX500FGA 2A - CAMSHAFT
2007 TRX500FGA A - CAMSHAFT
2007 TRX500FM 2A - CAMSHAFT
2007 TRX500FM A - CAMSHAFT
2007 TRX500FPE 2A - CAMSHAFT
2007 TRX500FPE A - CAMSHAFT
2008 TRX250EX A - CAMSHAFT
2008 TRX250TE A - CAMSHAFT / VALVE
2008 TRX250TM A - CAMSHAFT / VALVE
2008 TRX500FA 2A - CAMSHAFT
2008 TRX500FA A - CAMSHAFT
2008 TRX500FE 2A - CAMSHAFT
2008 TRX500FE A - CAMSHAFT
2008 TRX500FGA 2A - CAMSHAFT
2008 TRX500FGA A - CAMSHAFT
2008 TRX500FM 2A - CAMSHAFT
2008 TRX500FM A - CAMSHAFT
2008 TRX500FPE 2A - CAMSHAFT
2008 TRX500FPE A - CAMSHAFT
2008 TRX500FPM 2A - CAMSHAFT
2008 TRX500FPM A - CAMSHAFT
2009 TRX250TE A - CAMSHAFT / VALVE
2009 TRX250TM A - CAMSHAFT / VALVE
2009 TRX250X A - CAMSHAFT
2009 TRX250X A - CAMSHAFT / VALVE
2009 TRX500FA 2A - CAMSHAFT / VALVE
2009 TRX500FA A - CAMSHAFT / VALVE
2009 TRX500FE 2A - CAMSHAFT
2009 TRX500FE A - CAMSHAFT
2009 TRX500FM 2A - CAMSHAFT
2009 TRX500FM A - CAMSHAFT
2009 TRX500FPA 2A - CAMSHAFT / VALVE
2009 TRX500FPA A - CAMSHAFT / VALVE
2009 TRX500FPE 2A - CAMSHAFT
2009 TRX500FPE A - CAMSHAFT
2009 TRX500FPM 2A - CAMSHAFT
2009 TRX500FPM A - CAMSHAFT
2011 TRX250TE A - CAMSHAFT / VALVE
2011 TRX250TM A - CAMSHAFT / VALVE
2011 TRX250X A - CAMSHAFT
2011 TRX250X A - CAMSHAFT / VALVE
2011 TRX500FA 2A - CAMSHAFT / VALVE
2011 TRX500FA A - CAMSHAFT / VALVE
2011 TRX500FE 2A - CAMSHAFT
2011 TRX500FE A - CAMSHAFT
2011 TRX500FM 2A - CAMSHAFT
2011 TRX500FM A - CAMSHAFT
2011 TRX500FPA 2A - CAMSHAFT / VALVE
2011 TRX500FPA A - CAMSHAFT / VALVE
2011 TRX500FPE 2A - CAMSHAFT
2011 TRX500FPE A - CAMSHAFT
2011 TRX500FPM 2A - CAMSHAFT
2011 TRX500FPM A - CAMSHAFT
2012 TRX250TE A - CAMSHAFT / VALVE
2012 TRX250TM A - CAMSHAFT / VALVE
2012 TRX250X A - CAMSHAFT
2012 TRX250X A - CAMSHAFT / VALVE
2012 TRX500FA 2A - CAMSHAFT / VALVE
2012 TRX500FA A - CAMSHAFT / VALVE
2012 TRX500FPA 2A - CAMSHAFT / VALVE
2012 TRX500FPA A - CAMSHAFT / VALVE
2013 TRX250TE AC - CAMSHAFT / VALVE
2013 TRX250TM AC - CAMSHAFT / VALVE
2013 TRX250X AC - CAMSHAFT
2013 TRX250X AC - CAMSHAFT / VALVE
2013 TRX500FA 2AC - CAMSHAFT / VALVE
2013 TRX500FA AC - CAMSHAFT / VALVE
2013 TRX500FPA 2AC - CAMSHAFT / VALVE
2013 TRX500FPA AC - CAMSHAFT / VALVE
2014 TRX250TE AC - CAMSHAFT / VALVE
2014 TRX250TM AC - CAMSHAFT / VALVE
2014 TRX250X AC - CAMSHAFT
2014 TRX250X AC - CAMSHAFT / VALVE
2014 TRX500FA AC - CAMSHAFT / VALVE
2014 TRX500FPA AC - CAMSHAFT / VALVE
2016 TRX250TE AC - CAMSHAFT / VALVE
2016 TRX250TM AC - CAMSHAFT / VALVE
2016 TRX250X 3AC - CAMSHAFT
2016 TRX250X 3AC - CAMSHAFT / VALVE
2016 TRX250X AC - CAMSHAFT
2016 TRX250X AC - CAMSHAFT / VALVE
2017 TRX250TE AC - CAMSHAFT / VALVE
2017 TRX250TM AC - CAMSHAFT / VALVE
2017 TRX250X 3AC - CAMSHAFT / VALVE
2017 TRX250X AC - CAMSHAFT / VALVE
2018 TRX250TE A - CAMSHAFT / VALVE
2018 TRX250TE AC - CAMSHAFT / VALVE
2018 TRX250TM A - CAMSHAFT / VALVE
2018 TRX250TM AC - CAMSHAFT / VALVE
2018 TRX250X A - CAMSHAFT / VALVE
2018 TRX250X AC - CAMSHAFT / VALVE
2019 TRX250TE1 AC - CAMSHAFT / VALVE
2019 TRX250TM1 AC - CAMSHAFT / VALVE
2019 TRX250X AC - CAMSHAFT / VALVE
2020 TRX250TE1 AC - CAMSHAFT / VALVE
2020 TRX250TM1 AC - CAMSHAFT / VALVE
2020 TRX250X AC - CAMSHAFT / VALVE

The push rods were the same for:
1995 TRX400FW A - CAMSHAFT
1995 TRX400FW AN - CAMSHAFT
1996 TRX400FW A - CAMSHAFT
1996 TRX400FW AN - CAMSHAFT
1997 TRX400FW A - CAMSHAFT
1997 TRX400FW AN - CAMSHAFT
1998 TRX400FW A - CAMSHAFT
1998 TRX400FW AC - CAMSHAFT
1998 TRX450ES A - CAMSHAFT
1998 TRX450ES AM - CAMSHAFT
1998 TRX450S A - CAMSHAFT
1998 TRX450S AM - CAMSHAFT
1999 TRX400FW A - CAMSHAFT
1999 TRX450ES A - CAMSHAFT
1999 TRX450S A - CAMSHAFT
2000 TRX400FW A - CAMSHAFT
2000 TRX450ES A - CAMSHAFT
2000 TRX450S A - CAMSHAFT
2001 TRX400FW A - CAMSHAFT
2001 TRX450ES A - CAMSHAFT
2001 TRX450S A - CAMSHAFT
2002 TRX400FW A - CAMSHAFT
2002 TRX450FE A - CAMSHAFT
2002 TRX450FM A - CAMSHAFT
2003 TRX400FW A - CAMSHAFT / VALVE
2003 TRX450FE A - CAMSHAFT
2003 TRX450FM A - CAMSHAFT
2004 TRX450FE A - CAMSHAFT
2004 TRX450FM A - CAMSHAFT

Based on this information, I will guess the 99-04 450 top end can be swapped, but you might also need to swap cams, carb holder (intake manifold), carb and exhaust.

Can't say about the wheels - never tried it

Have fun and learn something
 
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