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Author Topic: bigbore or stroke it  (Read 2097 times)

Offline 1badazz_700r

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bigbore or stroke it
« on: March 29, 2009, 03:03:27 PM »
which would produce more power gains? +5mm crank or trinity big bore kit
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Just a little 778
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hotrods +5 crank
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54mmTB with custom intake
sparks X-6exhaust
PC5/w autotune
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hiper dual beadlocks/w gncc holeshots
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Offline VelociRaptor

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Re: bigbore or stroke it
« Reply #1 on: March 29, 2009, 04:22:50 PM »
5mm crank.
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Offline 1badazz_700r

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Re: bigbore or stroke it
« Reply #2 on: March 29, 2009, 04:42:16 PM »
thanks bo :thumbs: the cranks are cheaper than a BB kit to  :lol:
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Just a little 778
105.5 WK cylinder CP 11:1
hotrods +5 crank
racersedge +2 head,with webb4
54mmTB with custom intake
sparks X-6exhaust
PC5/w autotune
dynatek programmable
slingshot lockup
+3 stock swingarm
hiper dual beadlocks/w gncc holeshots
flexx bars,burgard+2stem/w antivibe
ASV's
odi's

Offline r00st

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Re: bigbore or stroke it
« Reply #3 on: March 30, 2009, 03:49:14 PM »
Not to mention your torque will be up significantly over a big bore kit, as well as having a very fat torque curve (torque peaks early and carries throughout the rpm band).

Stroke it up!
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Offline dabigbratj

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Re: bigbore or stroke it
« Reply #4 on: March 30, 2009, 03:59:29 PM »
stroke :clap:
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Offline Peelz

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Re: bigbore or stroke it
« Reply #5 on: March 30, 2009, 04:09:15 PM »
Yeah baby, Stroke it.....oh wait,....what was this thread about again.

:jerkoff:
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Offline preddy08

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Re: bigbore or stroke it
« Reply #6 on: March 30, 2009, 04:24:51 PM »
I would have it ballanced and trued for you motor specs. I would never just drop in a crank and call it a day. It will be worth in in the long run.
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Offline 1badazz_700r

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Re: bigbore or stroke it
« Reply #7 on: March 31, 2009, 02:38:12 AM »
I thought the barker cranks were balanced ???
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Just a little 778
105.5 WK cylinder CP 11:1
hotrods +5 crank
racersedge +2 head,with webb4
54mmTB with custom intake
sparks X-6exhaust
PC5/w autotune
dynatek programmable
slingshot lockup
+3 stock swingarm
hiper dual beadlocks/w gncc holeshots
flexx bars,burgard+2stem/w antivibe
ASV's
odi's

Offline preddy08

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Re: bigbore or stroke it
« Reply #8 on: March 31, 2009, 08:08:36 AM »
Quote from: 1badazz_700r on March 31, 2009, 02:38:12 AM
I thought the barker cranks were balanced ???

You cant have one ballance for every type of motor out there. It will vary depending on what motor stup your using.


I thought you were going with a hotrod crank?
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Just a little 81hp trail bike.

Offline Krandall

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Re: bigbore or stroke it
« Reply #9 on: March 31, 2009, 08:37:23 AM »
I don't get it.. shouldn't a balanced crank be a balanced crank, no matter the quad it's in? ???
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Offline VelociRaptor

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Re: bigbore or stroke it
« Reply #10 on: March 31, 2009, 08:47:59 AM »
Custom balanced with the piston your runnin. The cranks that come "balanced" use an avreage on the piston weights of pistons available for that engine.
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Offline Krandall

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Re: bigbore or stroke it
« Reply #11 on: March 31, 2009, 09:32:38 AM »
Do you just get extra vibration if it's not balanced? Or what kind of symptons would one experience w/ an unbalanced crank?
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Offline preddy08

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Re: bigbore or stroke it
« Reply #12 on: March 31, 2009, 09:38:13 AM »
Quote from: Krandall on March 31, 2009, 09:32:38 AM
Do you just get extra vibration if it's not balanced? Or what kind of symptons would one experience w/ an unbalanced crank?

We put a unballanced +3 Hot Rod crank in a YFZ and it wore out the lower end berrings and caused excessive "thrust" in the crank and had piston to head contact, that inturn broke a valve, then the wristpin, then the rod went through the cylinder wall.

Pretty much total carnage.
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Offline 1badazz_700r

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Re: bigbore or stroke it
« Reply #13 on: March 31, 2009, 06:06:35 PM »
Ok im a little confused.why is it you can put any standard bore piston on the stock rotating assembly but your saying you cant put an after market crank in with the same piston i have now without issues. or did i miss understand something ???Im gonna just go for it and take my chances, worst case senario i ahve to go bigger :lol:
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Just a little 778
105.5 WK cylinder CP 11:1
hotrods +5 crank
racersedge +2 head,with webb4
54mmTB with custom intake
sparks X-6exhaust
PC5/w autotune
dynatek programmable
slingshot lockup
+3 stock swingarm
hiper dual beadlocks/w gncc holeshots
flexx bars,burgard+2stem/w antivibe
ASV's
odi's

Offline preddy08

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Re: bigbore or stroke it
« Reply #14 on: March 31, 2009, 06:16:00 PM »
Quote from: 1badazz_700r on March 31, 2009, 06:06:35 PM
Ok im a little confused.why is it you can put any standard bore piston on the stock rotating assembly but your saying you cant put an after market crank in with the same piston i have now without issues. or did i miss understand something ???Im gonna just go for it and take my chances, worst case senario i ahve to go bigger :lol:

I think your understanding it right, but if you go that deap into the motor you might as well do it up 100%.

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