Author Topic: Ch25s v-twin  (Read 6476 times)

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Offline leadslead

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Ch25s v-twin
« on: November 21, 2013, 06:12:23 PM »
So I just picked up a hor kohler 725cc what do I have to do to give it more hp ..thing wights a ton 1.?? Crank
No nothing about thies motors b&s easy but kohler no idea any info would be help full .. As for carb are they all single barrel ??


STEVE HENDERSON

Offline catfishdan

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Re: Ch25s v-twin
« Reply #1 on: November 22, 2013, 01:36:03 AM »
the 30hp twin is same block but runs 2barrel carb and intake. you will be suprised what these engines will do even with minimal work. they are heavy but when you look at parts you wilm understand why. they are built last
Dan

Hit it fast....rail it hard

Offline leadslead

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Re: Ch25s v-twin
« Reply #2 on: November 22, 2013, 04:14:13 AM »
Yea been in side a ole single ..... Yea very heavy so.  What would be a mild build  cam rods ... 30 hp dual carb
STEVE HENDERSON


Offline catfishdan

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Re: Ch25s v-twin
« Reply #3 on: November 22, 2013, 05:07:19 AM »
rods/pistons
solid lifter stock cam
valve springs
adjustable rockers
flywheel
good clean up of ports on heads
30hp carb and intake

cheap mild build that will be very reliable and perform well
Dan

Hit it fast....rail it hard

Offline leadslead

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Re: Ch25s v-twin
« Reply #4 on: November 22, 2013, 07:23:56 AM »
Stock pistons no good ???
STEVE HENDERSON

Offline catfishdan

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Re: Ch25s v-twin
« Reply #5 on: November 22, 2013, 08:34:30 AM »
they have huge dish. best to go with aftermaket
Dan

Hit it fast....rail it hard

Offline beezerboy

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Re: Ch25s v-twin
« Reply #6 on: November 24, 2013, 02:54:51 AM »
can you give us an approximate on the volume of the dished part on the stock piston?


Offline flatlanderfornow

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Re: Ch25s v-twin
« Reply #7 on: November 24, 2013, 05:06:52 AM »
A graduated syringe and some rubbing alcohol will tell you very quickly. Make sure what
you're measuring is flat, put a measured quantity in the syringe (available at veterinary
supply places), fill the area to be measured till it JUST comes out, read what's left in the syringe,
and do the math.  Very helpful to know how to do this, works for heads as well and
allows you to cut them yourself and get them both the same.  6" tabletop belt sander works good
for cutting the heads down-thanks Paul!
Todd Potter
603-922-5269

Offline PJG56

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Re: Ch25s v-twin
« Reply #8 on: November 24, 2013, 06:34:54 AM »
A graduated syringe and some rubbing alcohol will tell you very quickly. Make sure what
you're measuring is flat, put a measured quantity in the syringe (available at veterinary
supply places), fill the area to be measured till it JUST comes out, read what's left in the syringe,
and do the math.  Very helpful to know how to do this, works for heads as well and
allows you to cut them yourself and get them both the same.  6" tabletop belt sander works good
for cutting the heads down-thanks Paul!


Your welcome Todd.
Paul Guptill  (oppy) #238modX
2012 slmra mowstock champion(builder/owner)

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2015 All American 2nd place BP (builder/owner)

Offline leadslead

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Re: Ch25s v-twin
« Reply #9 on: November 24, 2013, 07:24:58 AM »
Any way to shave weight off thies things like 50 lbs worth or are they just heavy no matter what
STEVE HENDERSON

Offline beezerboy

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Re: Ch25s v-twin
« Reply #10 on: November 24, 2013, 02:36:29 PM »
ya well, thanks, but I kinda all ready know how to measure them.... mine are unfortunately still in the engine at the moment. I'm just trying to do some planning before I tear it down (or not). anybody have some numbers? aprox is close enough to do some projections. thanks

Offline flatlanderfornow

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Re: Ch25s v-twin
« Reply #11 on: November 26, 2013, 05:29:54 PM »
I got a pair out in the barn I'll measure this weekend if you don't mind waiting that long.
Todd Potter
603-922-5269

Offline beezerboy

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Re: Ch25s v-twin
« Reply #12 on: November 26, 2013, 10:22:07 PM »
ya, nice! very helpful to know that

Offline flatlanderfornow

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Re: Ch25s v-twin
« Reply #13 on: November 27, 2013, 05:02:34 PM »
Be best of course to make the volume 0 ;)
Todd Potter
603-922-5269

Offline leadslead

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Re: Ch25s v-twin
« Reply #14 on: December 08, 2013, 05:23:09 PM »
If u put aluminum flywheel on gotta do any thing different with fire box be sides chuck it ???can u use same coils ??
STEVE HENDERSON