Author Topic: project bobber with vangaurd v twin  (Read 25871 times)

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Offline amcchevy1

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Re: project bobber with vangaurd v twin
« Reply #15 on: August 09, 2010, 10:19:01 pm »

was the polaris tranny for a quad?
1 gear in each direction and holds for a 600lb atv plus rider.
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Offline cycloneracer

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Re: project bobber with vangaurd v twin
« Reply #16 on: August 09, 2010, 10:46:21 pm »
First no bumps.  For any reason.

A CVT transmission won't just "bolt" on to your engine. You will need to know how to tune the clutches. Which is very complicated!  I have a sled and pay a guy to tune mine.

I'm telling ya harley tranny!  You can belt drive to it and shift on the fly. Not sure what end the cluch is on but you may be able to use that too. Just have to build a some way to hook them together.

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Offline pyro29073

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Re: project bobber with vangaurd v twin
« Reply #17 on: August 09, 2010, 11:12:27 pm »
sorry, just saw all the views and still no answers to any of the questions asked

Cody & Jon
 
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Offline cycloneracer

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Re: project bobber with vangaurd v twin
« Reply #18 on: August 09, 2010, 11:58:03 pm »
Still no bumps, ever.
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Offline royalblu68f100

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Re: project bobber with vangaurd v twin
« Reply #19 on: August 10, 2010, 07:01:18 am »
I would look into a higher lift cam that way you have more power throughout the rpm range.  The Cheetah grind from precision really wakes up a vanguard.
You never win a race by focusing on one aspect of the race!  Motor isn't everything, but you better have a good one!  Chassis too!  But remember, a driver can take a slow machine and make it faster!  I may not have/be the best of any of these but I'm trying!
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Offline pyro29073

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Re: project bobber with vangaurd v twin
« Reply #20 on: August 10, 2010, 10:34:22 pm »
yeah im planning on upgrading the cam and motor internals someday
but staying with the bobber theme and my budget ive got to keep it cheap for now
if i do look into a cam ill look at that cheetah though, ive heard good things about it

update: still no pics as i am still gathering parts

im thinking of buying a honda rebel 250 i found for sale locally with brand new tires and a new battery but a bad motor
if i get this bike im going to use the front end and wheels and tires and other various items for the build
Cody & Jon
 
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Offline cycloneracer

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Re: project bobber with vangaurd v twin
« Reply #21 on: August 10, 2010, 10:42:48 pm »
Don't use the cheeta cam for this. It is way to radical for your application.  Proper gearing is more important. Starting with bike is the only way to build a chopper. That way it is easy to get it licensed and insurance. And you get all the lights and controls you will need for it to be street legal.  I'd keep the engine stock and keep your RPMs down but upgrade the retainers on the valves.

Your still going to want to run a shiftable transmission. A CVT tranny will cost you a fortune to get right.

Good luck
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Offline pyro29073

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Re: project bobber with vangaurd v twin
« Reply #22 on: August 12, 2010, 06:34:53 pm »
yeah i'm thinking of sticking with the torque convertor set-up
it will be much simpler and give the bike a clean look with no clutch or tranny

do you think this kit from cartspartsplus.com would work?
anyone used this kit?

it says it comes with
-Alloy Steel Pushrods
-30* Timing key
-Forged Spring Retainers
-Valve Spring shims
pic of the kit
Cody & Jon
 
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Offline hobo3128640

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Re: project bobber with vangaurd v twin
« Reply #23 on: August 12, 2010, 06:38:38 pm »
i have used the kit and it should work good for what you are doin.
Bobby hamm

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Re: project bobber with vangaurd v twin
« Reply #24 on: August 12, 2010, 08:07:30 pm »
I found Harley trannys on Ebay for about $300 to $500.

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Re: project bobber with vangaurd v twin
« Reply #25 on: August 12, 2010, 09:44:37 pm »
HArley tranny, Billet rods, Dual springs and retainers, Precision 265 cam, very mild and will give it that little extra umph ya need. Go with standard length rods, Keep the dish in the pistons so you don't have that wild higher compression motor. You need the charging system for the battery and lights so a stock wheel is needed. But the setup above it should run 5500 easily for the road trips and the cam will allow those quick bursts for the extra go when ya need it for passing or just to get on it to enjoy it. You will be able to turn 6500 with this cam and stock wheel. USE a tach and keep it under that and you will be good to go. These motors make great lil bike motors. You don't even need the cam the stock cam with the right spring pressure and head work will turn 6000. But the the etra go is nice to have.
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Offline pyro29073

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Re: project bobber with vangaurd v twin
« Reply #26 on: August 12, 2010, 11:56:17 pm »
thanks for all the info!

a harley tranny would be good but im still thinking of trying to go clutchless

i found a torque convertor on a golf kart site that says its good up to 100hp and 10000 rpm

its on http://www.cartpartsplus.com/1-inch-roller-clutch.html

my question is since this clutch is acctually for a golf cart with a vanguard will it still work for my application?
the bike wont be nearly as heavy as a golf cart is so i didnt know if there would be any problems with it engaging
as long as it engages at the right rpm i shoud be fine right?

pic of clutch
also george, how much would a set of dual springs and retainers cost from e.c. ?
Cody & Jon
 
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Offline cycloneracer

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Re: project bobber with vangaurd v twin
« Reply #27 on: August 12, 2010, 11:59:39 pm »
Do you have any idea how HUGE those things are?  It will be bigger than the bike.  And you have to have a secondary clutch to make it work.  Then you have to change springs/ramps/helix in both clutches to get them right.  If you have never tuned a CVT tranny you won't get it right.  The clutches work togther and MUST work together or it won't work.  I have a sled and know guys that have messed with their clutchs and made their sleds perform worse becasue they didn't know what they were doing.  You will need a clutch on a bike so it engages easy.  Those CVT clutches can engage hard at times which would be BAD on a bike.

You will be cheeper and easier build if you get a harley tranny.  Or some other shift on the fly tranny.

CVT clutches are great on sleds, ATV's and golf carts.....................but not on bikes.
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Offline pyro29073

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Re: project bobber with vangaurd v twin
« Reply #28 on: August 13, 2010, 12:12:01 am »
alright thats what i needed to know

ive seen bikes built with a comet type torque convertor
would this be any different or would i have the same issues?

i know they use these on ridley bikes, not sure what exact brand but it looks like this
ridley clutch set-up
Cody & Jon
 
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Offline cycloneracer

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Re: project bobber with vangaurd v twin
« Reply #29 on: August 13, 2010, 12:19:59 am »
That is the exact same thing only smaller.  It CAN work, but you have to know what your doing.

You need to know the HP of the engine.
Where you want the clutch to engage (RPM)
When you want the secondary to start to engage (RPM)
How much backshift you want out of both clutches (RPM)

Get any of these things wrong and it won't be any fun to ride.  IF it engages to hard, you will go over the back.  If it backshifts to soft you won't have any power once you get back on the throttle, it will lug.  If the secondary engages to soon it will bog,  To late it will over rev.  Same with the primary and it must match the secondary.

I'm not sure a comet style torque converter that you are thinking of will handle the power for long periods of time.  They are a CVT tranny just with a different name.


Gearbox is the way to go.  Even if you get your ratios off you have multiple gears to help overcome that.

If your a clutch tuner go with the CVT, but I wouldn't..........
Paul Krueger

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