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Need Modification Info!!
https://www.mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=1452		 Page 1 of 1
Author:  High Voltage [ Wed Apr 08, 2009 7:28 pm ]
Post subject:  Need Modification Info!!
Brand new 35 Surface Drive on 18'X54" Surface Drive Boat runs 28.5 stock in deep water. What mods should I do without blowing it up?
Author:  dog walker [ Wed Apr 08, 2009 7:54 pm ]
Post subject:  Re: Need Modification Info!!
Head work,carb,and exhaust .........nothing to it ;)
Author:  hunter [ Thu Apr 09, 2009 5:36 am ]
Post subject:  Re: Need Modification Info!!
If you speak to Hoyt at Gatortail, he recommends head work,cam,pushrods,exhaust,carb replacment or he knows how to adjust factory carb. for maxium preformance. I am very happy with my modifications recommended by Hoyt. I replace my carb. and did the rest of the mods he recommended. I increased speed by 6mph and load carrying ability increased alot. Highly recommend!
Author:  deadbird8 [ Thu Apr 09, 2009 7:33 am ]
Post subject:  Re: Need Modification Info!!
Author:  flatboat [ Wed Apr 15, 2009 10:21 am ]
Post subject:  Re: Need Modification Info!!
Your boat will never be fast you have the slowest boat/motor combo out there!!!!!!!!! :mrgreen:
Author:  Divinduck [ Wed Apr 15, 2009 11:04 am ]
Post subject:  Re: Need Modification Info!!
Author:  deadbird8 [ Wed Apr 15, 2009 4:07 pm ]
Post subject:  Re: Need Modification Info!!
I did alot of stuff to increase flow. Got most of the info here (and a lot of questions answered. I reduced the gear ratio to keep it under 4500RPM.

-EVT Stage 1 heads
-Old can style BPS exhaust (good high flow muffler)
-K&N air filter
-Bored out stock intake to combine the chambers and mate to the heads
-Carb spacer
-Thinned throttle shafts- replaced screw/lock washers on throttle/choke plates with low profile button head screws (loctite them in)
-Cut the air intake plate
-Trimmed the fan and removed screen mounting HW
-Replaced the Gov Spring with one from the MB 45
-Valve lash at .005

Intake (Silk did this):


Carb throttle shafts and low profile screws:


Cut out intake plate to improve flow- smoothed out the elbow underneath too:

Fan trimmed- probably minimal gain:


It was a hot motor to start with pushing my heavy boat.
Author:  JD [ Thu Apr 16, 2009 10:38 pm ]
Post subject:  Re: Need Modification Info!!
Author:  Divinduck [ Fri Apr 17, 2009 7:33 am ]
Post subject:  Re: Need Modification Info!!
Author:  deadbird8 [ Fri Apr 17, 2009 11:49 am ]
Post subject:  Re: Need Modification Info!!
Probably could have kept the stock jets- have 148/150 in it now so not too much different. The MB 45 runs stock jets 142/148. Really need an exhaust gas analyzer to get it perfect.
Author:  Divinduck [ Fri Apr 17, 2009 1:09 pm ]
Post subject:  Re: Need Modification Info!!
Author:  bayouboy [ Fri Apr 17, 2009 11:23 pm ]
Post subject:  Re: Need Modification Info!!
Good stuff!
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