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17 August 2007, 11:42
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#41
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Member
Country: USA
Town: boston
Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
Engine: OMC Mod50
Join Date: Apr 2006
Posts: 398
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once the crank is welded on the Hot-Su you can lose the rev limiter, and she will pull to the 7's and your hull would be much faster.
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18 August 2007, 12:37
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#42
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Member
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 5,596
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Not wishing to steal fast fred's thunder and also not knowing Tohatsu engines you might wonder why I'm replying here but we used to do this to motor bike engines years ago.
The crank pins are a push fit into the crank throws and they can move under stress. This can allow a bit of longitudinal flexing but mostly it can allow a bit of rotation of the pin within the crank throw and this, in turn, puts the main bearing journals slightly out of alignment and, consequntly, out of balance. The solution is to weld the end of the pin to the crank throw as per fred's photo. It's a good idea to put the crank between centres in a lathe and use a DTI to check the journals are aligned before welding them. Judicious use of a copper mallet can align them.
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JW.
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19 August 2007, 14:02
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#43
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Member
Country: USA
Town: boston
Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
Engine: OMC Mod50
Join Date: Apr 2006
Posts: 398
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that is all drag bike crank Guys work, he is magic with a brass mallet and a chizil,
he runs it out before the weld and after, two "Y" up rights are my first choose, then the lathe, none have ever failed, no mater how hard ya crank them.
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24 August 2007, 12:01
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#44
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Member
Country: USA
Town: boston
Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
Engine: OMC Mod50
Join Date: Apr 2006
Posts: 398
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some Yama 50, she got the welded crank, with 70hp carbs
![](http://img257.imageshack.us/img257/7925/p8220005wh9.th.jpg)
no revlimiter
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24 August 2007, 12:06
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#45
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Member
Country: USA
Town: boston
Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
Engine: OMC Mod50
Join Date: Apr 2006
Posts: 398
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24 August 2007, 21:28
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#46
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Member
Country: UK - England
Town: Colchester/Clevedon
Boat name: Barracuda
Make: Porters
Length: 5m +
Engine: Tohatsu 50hp
Join Date: Oct 2006
Posts: 249
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Fred - have you got any video of your race engines running? I'd love to hear and see them modded and without the rev limiter
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28 August 2007, 03:00
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#47
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Member
Country: USA
Town: boston
Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
Engine: OMC Mod50
Join Date: Apr 2006
Posts: 398
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they don't hang around long,once tested, they are on thare way to ware ever.
that ones runnin, turnin slow, the camera cought the fly wheel still,
i'll see if i can get a clip of my moda on me hull.
till then, we gots a shot of a Fast Fred Super Stinger, bumpin on the stand
check the fly wheel
![](http://img503.imageshack.us/img503/4509/p6280005wv2.th.jpg)
and a vary rare CC FT.
![](http://img213.imageshack.us/img213/9409/p7070011rb8.th.jpg)
with12 custom venturi carbs ![eek](https://www.rib.net/forum/images/smilies/eek.gif) cuzz you gots to have them
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29 August 2007, 05:13
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#48
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Member
Country: Canada
Town: British Columbia
Make: Gemini
Length: 4m +
Engine: 40hp 2 str
Join Date: Oct 2003
Posts: 2,151
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Quote:
Originally Posted by fast fred
some Yama 50, she got the welded crank, with 70hp carbs
![](http://img257.imageshack.us/img257/7925/p8220005wh9.th.jpg)
no revlimiter ![eek](https://www.rib.net/forum/images/smilies/eek.gif)
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Can 70 hp carbs be bolted right up to a Yamaha 40/50 hp outboard, or is alot of fabrication involved?
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29 August 2007, 10:41
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#49
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Member
Country: USA
Town: boston
Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
Engine: OMC Mod50
Join Date: Apr 2006
Posts: 398
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bolt right on, should set the crank for the 70 carbs, needs a 50hp exhaust pipe
or tuned pipe, you gots to re jet them.
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29 August 2007, 14:16
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#50
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Member
Country: Canada
Town: British Columbia
Make: Gemini
Length: 4m +
Engine: 40hp 2 str
Join Date: Oct 2003
Posts: 2,151
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03 September 2007, 14:48
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#51
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Member
Country: USA
Town: boston
Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
Engine: OMC Mod50
Join Date: Apr 2006
Posts: 398
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the 40 has the lighter crank than the 50, make sure ya have it welded
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03 November 2007, 11:06
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#52
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Member
Country: USA
Town: boston
Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
Engine: OMC Mod50
Join Date: Apr 2006
Posts: 398
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OK then, lookin at the Bizzness end of things hear.
![](http://img503.imageshack.us/img503/4182/pa210001hh9.th.jpg)
gots the torque sirpresser on thare and dapanater, cuzz you needs them
![](http://img527.imageshack.us/img527/1534/pa210002qa6.th.jpg)
some F3 powerhead shots
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03 November 2007, 11:11
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#53
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Member
Country: USA
Town: boston
Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
Engine: OMC Mod50
Join Date: Apr 2006
Posts: 398
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and with the hood
![](http://img518.imageshack.us/img518/8510/pa210006up4.th.jpg)
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06 November 2007, 10:22
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#54
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Member
Country: USA
Town: boston
Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
Engine: OMC Mod50
Join Date: Apr 2006
Posts: 398
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06 November 2007, 10:23
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#55
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Member
Country: USA
Town: boston
Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
Engine: OMC Mod50
Join Date: Apr 2006
Posts: 398
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lookin more like full pressure now ya thats workin
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07 November 2007, 10:04
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#56
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Member
Country: USA
Town: boston
Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
Engine: OMC Mod50
Join Date: Apr 2006
Posts: 398
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09 November 2007, 01:05
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#57
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Member
Country: Australia
Town: old bar
Boat name: efo
Make: avon
Length: 4m +
Engine: yam60hp 2stroke
Join Date: Oct 2007
Posts: 23
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very interesting
gday ,,and any ideas on how to get hp from a 60hp yam feto
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19 November 2007, 09:22
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#58
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Member
Country: USA
Town: boston
Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
Engine: OMC Mod50
Join Date: Apr 2006
Posts: 398
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should weld the crank on that one, and snip the tails off the wrist pin clips.
then clip the rev limiter, two stage reeds, 90hp carbs with a 160 main jet.
that will wake it up
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11 January 2008, 05:05
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#59
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Member
Country: New Zealand
Length: 4m +
Join Date: Jan 2008
Posts: 2
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more pics please
Hi Fred can you please post more pics of the welded crank.
I am going to try and rebuild my Yam 60 and I'm going to try and do it as you suggested...will keep you all posted.
Also this is avilable in NZ there is 2 75 stingers for around $4000.00 NZ dollars check out the pic I think they are good nick, this one has had one owner since new.....oh yeah the boats come with them.
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24 March 2009, 00:22
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#60
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Member
Country: USA
Town: boston
Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
Engine: OMC Mod50
Join Date: Apr 2006
Posts: 398
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well good to see this is still hear, thanks to all who took the time to say what they think of my stuff ![eek](https://www.rib.net/forum/images/smilies/eek.gif)
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