More horses! - Page 3

fast fred · 17 August 2007, 11:42

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.

jwalker · 18 August 2007, 12:37

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.

fast fred · 19 August 2007, 14:02

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.

fast fred · 24 August 2007, 12:01

some Yama 50, she got the welded crank, with 70hp carbs

no revlimiter

fast fred · 24 August 2007, 12:06

closer to them carbs

and thumpin in the small tank

GuyP · 24 August 2007, 21:28

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

fast fred · 28 August 2007, 03:00

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

and a vary rare CC FT.

with12 custom venturi carbs

cuzz you gots to have them

prairie tuber · 29 August 2007, 05:13

Quote:

Originally Posted by fast fred

some Yama 50, she got the welded crank, with 70hp carbs

no revlimiter

Can 70 hp carbs be bolted right up to a Yamaha 40/50 hp outboard, or is alot of fabrication involved?

fast fred · 29 August 2007, 10:41

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.

prairie tuber · 29 August 2007, 14:16

I think my Yammie 40 might be due for a Dr. Jekyll to Mr. Hyde conversion.

fast fred · 03 September 2007, 14:48

the 40 has the lighter crank than the 50, make sure ya have it welded

fast fred · 03 November 2007, 11:06

OK then, lookin at the Bizzness end of things hear.

gots the torque sirpresser on thare and dapanater, cuzz you needs them

some F3 powerhead shots

fast fred · 03 November 2007, 11:11

and with the hood

fast fred · 06 November 2007, 10:22

see if me can Pump this up a bit

fast fred · 06 November 2007, 10:23

lookin more like full pressure now ya thats workin

fast fred · 07 November 2007, 10:04

truble · 09 November 2007, 01:05

gday ,,and any ideas on how to get hp from a 60hp yam feto

fast fred · 19 November 2007, 09:22

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

Jas · 11 January 2008, 05:05

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.

fast fred · 24 March 2009, 00:22

well good to see this is still hear, thanks to all who took the time to say what they think of my stuff