Big Bore Kits - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 03-19-2007, 07:56 PM Thread Starter
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Big Bore Kits

Does anyone know if there are any big bore kits out there for our bikes? I haven't been able to find anything so far.
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post #2 of 9 (permalink) Old 03-19-2007, 09:14 PM
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I have not heard of anyting like that for our bikes, people have been looking for new cams or big bore and cant find anything.
Sorry

Chad Falstad "Hawk"
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post #3 of 9 (permalink) Old 03-20-2007, 07:13 AM
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Yea, its called a Mean Streak
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post #4 of 9 (permalink) Old 03-20-2007, 12:26 PM
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LOL Rubline !!

Can't say I've heard of any big bore kits either. With the engine being liquid cooled, I'm not sure how much room there would be to make the cylinder any larger before getting too close to the water ports.

One member here (Edalbris) has done some pretty radical engine mods, including regrinding the crank and shaving the piston.
You can check out his pics of what he did HERE.


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post #5 of 9 (permalink) Old 03-20-2007, 03:09 PM
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well i agree hyper... big bore is outta the question. most aluminum block engines have thin steel sleves. this means boring and resleeving. not impossiable, just not cost effective for a few cc's. something you maybe interested is what edalbris did. creating a stroker. still increased displacement higher compression means more power. expect a rejet to use higher octane fuels, possiably some e85/e100 (it performes better under higher comps from 10:1-13:1. reprofiled pistons will be needed for valve clearance. I would also suggest redoing the cams with the changed compression ratio. Total cost will prolly be around the 2500 mark. depends on how bad you want power...

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post #6 of 9 (permalink) Old 03-20-2007, 04:22 PM
 
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Hi, do you know a way to improve torque on low rpm ?
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post #7 of 9 (permalink) Old 03-20-2007, 04:55 PM
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i never heard of big bore kits for our bike either. however i must admit i'm not MC modder and wouldn't have done it even if there was one. i would think getting a bike with bigger engine is the best thing to do if you feel like this is not enough ooomph for you.
although i can see how having extra power consealed in our humble and calm looking bike can be very cool.

Quote:
Originally Posted by Lootux View Post
Hi, do you know a way to improve torque on low rpm ?
mmm... is shifting to lower gear completley out of question???
you need to remember that unlike most v-twins ours realy likes to be revved. peak torque is somewhere near 4.5K rpm .
keep in mind that most of the mods (like degoating) are actually decreasing low rpm preformance and adding more at th top of the range.

Ride Safe

Anton.
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post #8 of 9 (permalink) Old 03-20-2007, 06:10 PM
 
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Quote:
Originally Posted by Hizzo3 View Post
well i agree hyper... big bore is outta the question. most aluminum block engines have thin steel sleves. this means boring and resleeving. not impossiable, just not cost effective for a few cc's. something you maybe interested is what edalbris did. creating a stroker. still increased displacement higher compression means more power. expect a rejet to use higher octane fuels, possiably some e85/e100 (it performes better under higher comps from 10:1-13:1. reprofiled pistons will be needed for valve clearance. I would also suggest redoing the cams with the changed compression ratio. Total cost will prolly be around the 2500 mark. depends on how bad you want power...
Finally, a smart statement about E-85, when will the car builders figure that out? low compression + alchohol = wasted fuel and lower MPG.(rant)
A compression bump and hi octane fuel is probably the only thing you could easily do to the Vulcan.
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post #9 of 9 (permalink) Old 03-20-2007, 07:23 PM
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Quote:
Originally Posted by Woody View Post
Finally, a smart statement about E-85, when will the car builders figure that out? low compression + alchohol = wasted fuel and lower MPG.(rant)
A compression bump and hi octane fuel is probably the only thing you could easily do to the Vulcan.
The car builders will figure it out when they stop getting money from the oil companies.you could boost compression ratios from some engines that i have seen from chevy and ford from the 8.8:1 to the 11.5:1 and run a required mid grade, then when you switch to e85, then you will gain quite a bit of power. Not like a 25% gain, but gains on a NA car can be from 5% to 15% depending on all factors. E85 and E100 would work really well in a forced induction engine. would love to see an older lightning with a stroker kit.

just for you gear heads E85 is about 100 octane, e100 is about 105-106 octane.

'04 Vn750
Currently Installed
nat'l cycle deflector shield
westco 12v30 MF, 30A/h w/ 350 CCA's w/ custom box
TOC stator cover w/ Frankenstator mod!
R/R relo

Soon to have (own or on order)
TOC ACCT's
Mez's 110-FRT 170/80-Rear
Custom rear fender and tail light
Givi hard bags w/ custom rear turn signals


Band Engineer/Webmaster for Josey Contreras Tejano Band
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