WELCOME TO RIVER DAVES PLACE

Opinions, considering twin 300xs as first OBs...

Carl P

New Member
Joined
Sep 16, 2020
Messages
2
Reaction score
0
Coming from a 25 Bullet w/a 525 to an F26 with Twin Merc 300xs. The Whackers are 2013 models and were freshly overhauled by Joe @ Hot Laps. Anything i need to watch out for on these motors? Is there a good resource i can use to learn all about em? Thanks!
 

ONE-A-DAY

Well-Known Member
Joined
May 21, 2010
Messages
15,806
Reaction score
18,790
Coming from a 25 Bullet w/a 525 to an F26 with Twin Merc 300xs. The Whackers are 2013 models and were freshly overhauled by Joe @ Hot Laps. Anything i need to watch out for on these motors? Is there a good resource i can use to learn all about em? Thanks!
your best resource is Joe
 

sonicss31

Well-Known Member
Joined
Dec 9, 2018
Messages
1,132
Reaction score
5,771
Ask if air compressors have been updated. Make sure fuel injection system has been cleaned/serviced.
 

ONE-A-DAY

Well-Known Member
Joined
May 21, 2010
Messages
15,806
Reaction score
18,790
Xs engines aren’t practically four strokes in my mind, no smoke, quiet, and sip fuel. Clean the injectors annually, lower unit oil every couple trips out and you will be fine. The c/r engine will cook the oil in one 110 mph run to the springs and back, so buy a 5 gallon tub of gear oil and change them often.
 

n2otoofast4u

Well-Known Member
Joined
Apr 7, 2015
Messages
3,169
Reaction score
4,508
Be very careful about putting oil in the CR side. Mine hold almost exactly the same amount on each side, but the CR side will spit after 10 or so pumps. I let it spit, wait 10 minutes, pump until it spits again, wait 10 minutes, and repeat that process until its truly full. Once I did this, the CR side oil lasts MUCH longer and looks MUCH better than it used to.

As a side note- I speed this up by popping the expansion tank off under the cowl, pump till it squirts, put plug back in, give it another 10 pumps, then wait a few minutes. Can typically get it full in 20 minutes or so.
 

stoker2001

Well-Known Member
Joined
Apr 14, 2013
Messages
599
Reaction score
404
Be very careful about putting oil in the CR side. Mine hold almost exactly the same amount on each side, but the CR side will spit after 10 or so pumps. I let it spit, wait 10 minutes, pump until it spits again, wait 10 minutes, and repeat that process until its truly full. Once I did this, the CR side oil lasts MUCH longer and looks MUCH better than it used to.

As a side note- I speed this up by popping the expansion tank off under the cowl, pump till it squirts, put plug back in, give it another 10 pumps, then wait a few minutes. Can typically get it full in 20 minutes or so.
this expansion tank setup is OEM?aftermarket?who makes?thanks
 

NWFreerider

Active Member
Joined
May 9, 2018
Messages
32
Reaction score
48
Get billet seal kits for the lower units from Mad EFI. I ran expansion tanks for a while on mine but had better luck keeping water out without them.
 

stoker2001

Well-Known Member
Joined
Apr 14, 2013
Messages
599
Reaction score
404
Get billet seal kits for the lower units from Mad EFI. I ran expansion tanks for a while on mine but had better luck keeping water out without them.
I noticed on MADEFI.com they no longer offer exp tanks..wonder if that's why?
 

NWFreerider

Active Member
Joined
May 9, 2018
Messages
32
Reaction score
48
The Super Stock class was the test bed for their seal kits and the guys were having less issues without them. The vent tube was a pain in the ass to deal with when removing/reinstalling lower units too!
 
Top