Post your technical questions here
Please limit advise to factory procedures & proven measures
by
Administrator »
Thu Nov 05, 2015 8:40 pm
0 Replies
494 Views
Last post by Administrator Thu Nov 05, 2015 8:40 pm
Gas Tank Question for mark 20
Replies: 1
by
jimshydroshop »
Sat Jun 25, 2022 8:38 pm
1 Replies
29 Views
Last post by dave bernard Sat Jun 25, 2022 9:09 pm
Question on hydroplane builder
Replies: 10
by
jimshydroshop »
Tue Jun 07, 2022 4:51 pm
10 Replies
188 Views
Last post by necks Thu Jun 23, 2022 5:06 pm
1956 Mark 30 gear foot question
Replies: 5
by
jimshydroshop »
Thu Jun 02, 2022 5:41 pm
5 Replies
115 Views
Last post by dave bernard Tue Jun 21, 2022 4:28 am
Quincy Throttle hookup to my stock Mark 20
Replies: 1
by
jimshydroshop »
Sun Jun 19, 2022 11:32 am
1 Replies
60 Views
Last post by AU52N Mon Jun 20, 2022 4:48 pm
1972 merc 200 20hp lower unit
Replies: 7
by
moutainmerc »
Fri May 13, 2022 5:06 am
7 Replies
139 Views
Last post by moutainmerc Fri Jun 10, 2022 11:19 pm
Merc 3.9 shift shaft
by
mercaholic »
Fri Jun 10, 2022 12:21 pm
0 Replies
25 Views
Last post by mercaholic Fri Jun 10, 2022 12:21 pm
Prop Help
Replies: 10
by
spitdoc »
Wed May 11, 2022 4:07 pm
10 Replies
158 Views
Last post by Dave Mckinney Thu Jun 09, 2022 11:19 pm
Plastic inserts to retain horseshoe
Replies: 2
by
daveswaves »
Thu Jun 09, 2022 8:06 pm
2 Replies
39 Views
Last post by daveswaves Thu Jun 09, 2022 9:41 pm
Merc 60 6 hp 1960 Cloud White Cowl
Replies: 3
by
Bob »
Sun Jun 05, 2022 12:21 am
3 Replies
68 Views
Last post by SteveC Tue Jun 07, 2022 4:41 am
NTN Bearings for 4cyl Mercs
Replies: 10
by
ctpdsr »
Wed Jan 23, 2019 11:06 pm
10 Replies
239 Views
Last post by Yellowjacket Mon Jun 06, 2022 12:22 am
no fuel coming through AJ Tillotson gravity carb?
Replies: 7
by
lowrider12 »
Sun May 22, 2022 5:49 pm
7 Replies
70 Views
Last post by lowrider12 Mon May 23, 2022 4:43 am
Portable jump box for barrel testing
by
MercuryMarc »
Sun May 22, 2022 10:01 pm
0 Replies
45 Views
Last post by MercuryMarc Sun May 22, 2022 10:01 pm
Mk15 powerhead
Replies: 2
by
exracergreg »
Thu May 19, 2022 9:14 pm
2 Replies
79 Views
Last post by exracergreg Fri May 20, 2022 12:09 am
Mercury 20/40 cubic inch piston rings
Replies: 1
by
champhotrod »
Tue May 10, 2022 1:31 am
1 Replies
79 Views
Last post by ctpdsr Wed May 11, 2022 9:17 pm
Spacers
Replies: 9
by
daveswaves »
Thu May 05, 2022 9:53 pm
9 Replies
121 Views
Last post by AU52N Sat May 07, 2022 11:13 pm
Part Numbers for O-Rings for Merc 250 Seal Retainer Ass'y A-29437A1
Replies: 9
by
Seakaye12 »
Mon Apr 25, 2022 3:38 pm
9 Replies
83 Views
Last post by AllanF Wed May 04, 2022 5:05 pm
Mark 5 - I'm so close - throttle/advance lever hitting something
Replies: 6
by
lowrider12 »
Tue May 03, 2022 6:06 pm
6 Replies
59 Views
Last post by lowrider12 Wed May 04, 2022 12:39 am
or find a Mercury: 48-34402 A4 11 inch pitch, cupped, bronze propeller
Replies: 7
by
CaptnDD »
Mon May 02, 2022 4:14 pm
7 Replies
101 Views
Last post by AllanF Tue May 03, 2022 11:27 pm
Generic Bearing House Equivalent for Merc 250 DriveShaft Bearing?
Replies: 9
by
Seakaye12 »
Fri Apr 22, 2022 3:16 pm
9 Replies
138 Views
Last post by AllanF Sat Apr 30, 2022 10:36 pm
Lower Unit Compatibility
Replies: 7
by
LenLamberg »
Fri Oct 01, 2021 3:35 pm
7 Replies
198 Views
Last post by LenLamberg Sun Apr 24, 2022 8:50 pm
Mark 78
Replies: 8
by
Scratcher »
Mon Feb 07, 2022 10:27 pm
8 Replies
159 Views
Last post by Scratcher Sat Apr 23, 2022 3:18 am
MK30 Mag Drive Housing
Replies: 3
by
ctpdsr »
Fri Apr 15, 2022 8:37 pm
3 Replies
64 Views
Last post by dave bernard Sat Apr 16, 2022 12:23 am
how do I grease my Mark 5?
Replies: 1
by
lowrider12 »
Mon Apr 11, 2022 10:52 pm
1 Replies
51 Views
Last post by dave bernard Mon Apr 11, 2022 10:58 pm
Can anyone I.D. these megaphone pipes?
Replies: 1
by
Tom Brockmeyer »
Sun Apr 10, 2022 5:40 pm
1 Replies
64 Views
Last post by Tom Brockmeyer Sun Apr 10, 2022 5:43 pm
1977 Thunderbolt 7.5hp questions
Replies: 44
by
Brad74 »
Wed Aug 25, 2021 11:52 am
44 Replies
470 Views
Last post by SteveC Fri Apr 08, 2022 2:03 am
Part number question IL6 exhaust side parts
Replies: 1
by
Rapier »
Tue Apr 05, 2022 9:17 pm
1 Replies
41 Views
Last post by AU52N Wed Apr 06, 2022 12:37 am
NGK plugs
Replies: 18
by
chuckw »
Tue Jan 18, 2022 7:36 pm
18 Replies
328 Views
Last post by Stobl Tue Apr 05, 2022 1:59 pm
Merc 1000 Reverse Lockout
by
Hank1995 »
Sat Mar 26, 2022 2:30 pm
0 Replies
32 Views
Last post by Hank1995 Sat Mar 26, 2022 2:30 pm
Trigger Wires
Replies: 1
by
Brad74 »
Tue Mar 22, 2022 6:24 pm
1 Replies
40 Views
Last post by RVRDRGN Tue Mar 22, 2022 8:47 pm
KG9 initial carb settings
Replies: 3
by
mercaholic »
Sun Mar 20, 2022 4:44 pm
3 Replies
67 Views
Last post by mercaholic Tue Mar 22, 2022 12:54 pm
Impeller Height
Replies: 3
by
mercaholic »
Mon Mar 07, 2022 9:30 pm
3 Replies
97 Views
Last post by SteveC Sun Mar 13, 2022 5:33 am
Piston rings
Replies: 2
by
Bob »
Fri Mar 11, 2022 1:54 am
2 Replies
99 Views
Last post by Bob Fri Mar 11, 2022 2:09 pm
Impeller.
Replies: 1
by
Alex from GA »
Sun Mar 06, 2022 2:46 am
1 Replies
60 Views
Last post by krazy karl Sun Mar 06, 2022 3:07 pm
gravity feed carb's needle/seat/float - how does it work?
Replies: 2
by
lowrider12 »
Wed Mar 02, 2022 5:48 pm
2 Replies
74 Views
Last post by lowrider12 Wed Mar 02, 2022 8:34 pm
mark 55E flywheel and carb float setting adjustment
Replies: 1
by
scubapop »
Sat Feb 26, 2022 8:03 pm
1 Replies
77 Views
Last post by AU52N Sun Feb 27, 2022 8:56 pm
Stevens capacitor and coil tester
Replies: 2
by
daveswaves »
Sat Feb 26, 2022 1:41 am
2 Replies
67 Views
Last post by daveswaves Sat Feb 26, 2022 6:07 pm
Phelon mag with Wico coils
Replies: 1
by
mercaholic »
Wed Feb 23, 2022 7:43 pm
1 Replies
86 Views
Last post by Cottage Racer Thu Feb 24, 2022 2:55 pm
Mark 25 will not start in neutral
Replies: 4
by
champhotrod »
Tue Feb 22, 2022 11:20 pm
4 Replies
79 Views
Last post by dave bernard Wed Feb 23, 2022 4:31 am
Phelon Flywheels Mod question
Replies: 16
by
mercaholic »
Tue Feb 08, 2022 6:56 pm
16 Replies
284 Views
Last post by champhotrod Tue Feb 22, 2022 10:52 pm
What motor is this crank for…
Replies: 14
by
58woody »
Thu Jan 27, 2022 7:13 pm
14 Replies
268 Views
Last post by 58woody Wed Feb 16, 2022 5:19 pm
Shaft seal area repairs
Replies: 3
by
74vector »
Sun Feb 13, 2022 5:17 pm
3 Replies
105 Views
Last post by DaytonaJohn Wed Feb 16, 2022 2:12 am
1961 Merc 500 rods
Replies: 3
by
spitdoc »
Fri Feb 11, 2022 7:05 pm
3 Replies
98 Views
Last post by ctpdsr Tue Feb 15, 2022 1:29 am
78 Mercury 90 Carbs
Replies: 5
by
Rapier »
Sat Feb 12, 2022 3:35 pm
5 Replies
69 Views
Last post by RVRDRGN Mon Feb 14, 2022 10:30 pm
hard shifting?
Replies: 4
by
fast99 »
Sat Jan 22, 2022 9:29 pm
4 Replies
107 Views
Last post by 74vector Sat Feb 12, 2022 10:07 pm
OMC coil and condenser part numbers
Replies: 4
by
Cottage Racer »
Tue Feb 08, 2022 4:30 pm
4 Replies
107 Views
Last post by Bob Thu Feb 10, 2022 2:15 pm
Mk20H Gold Paint
Replies: 4
by
mercaholic »
Tue Feb 01, 2022 8:15 pm
4 Replies
118 Views
Last post by ctpdsr Sun Feb 06, 2022 11:35 pm
1955 Mark 25 oil ratio
Replies: 5
by
Tom421 »
Wed Feb 02, 2022 10:05 pm
5 Replies
115 Views
Last post by ctpdsr Fri Feb 04, 2022 12:32 am
1395-8673
Replies: 11
by
Scratcher »
Wed Jan 26, 2022 10:28 pm
11 Replies
181 Views
Last post by Scratcher Sat Jan 29, 2022 3:59 pm
Motor Control Adjustment
Replies: 3
by
jkrowell »
Thu Jan 27, 2022 11:52 am
3 Replies
92 Views
Last post by jkrowell Fri Jan 28, 2022 1:04 pm
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