BF15d to BF20d conversion?

Author Message   Lorca Rossman New member Username: lorca Post Number: 3 Registered: 11-2007 Posted on Monday, October 26, 2009 - 02:34 pm:    I've got a 2003 BF15D electric start. I've heard the 15 and 20hp have the same platform and I would love a bit more power. Anyone know if I can upgrade to 20hp by just swapping out the carb and prop from the similar model 20hp or if there are more parts/complexity involved? thanks!!!   mike Advanced Member Username: hondadude Post Number: 217 Registered: 03-2009 Posted on Monday, October 26, 2009 - 08:46 pm:    It is not so easy. The 20 HP indeed has a different carburator and jets...but it also has a different cam and cdi. Those are the major differences.   Lorca Rossman Member Username: lorca Post Number: 4 Registered: 11-2007 Posted on Monday, October 26, 2009 - 11:25 pm:    thanks, much appreciate the info!   John Kelly Member Username: beachflies Post Number: 4 Registered: 12-2009 Posted on Wednesday, December 02, 2009 - 03:47 pm:    I've had similar thoughts about goosing up a 9.9 (2005). Is it do-able or a fool's errand?   jimmy dixon Member Username: jgmo Post Number: 13 Registered: 11-2009 Posted on Wednesday, December 02, 2009 - 07:23 pm:    wait until the warranty is up and ask again.   pilotart Advanced Member Username: pilotart Post Number: 178 Registered: 03-2008 Posted on Thursday, December 03, 2009 - 10:54 am:    "...goosing up a 9.9 (2005). Is it do-able or a fool's errand?" 9.9 HP is to allow use in locations that restrict to 'less-than-10 HP'. There is a throttle ristriction that if removed, will give you about 13 HP. A Google search would give you a lot of details on the subject.   mike Advanced Member Username: hondadude Post Number: 261 Registered: 03-2009 Posted on Thursday, December 03, 2009 - 06:23 pm:    In 2001, the 9.9 was redesigned. There are no longer any throttle restrictions that I know of. Some of the older 9.9's did have a physical restriction on the throttle mechanism. That is when the 9.9 and the 15hp had the same block. The current 9.9 and 15 have different size blocks, although design is similar. So upgrading a 2001 or later 9.9 to a 15 is a major change.

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