Team-BHP - View Single Post - Increasing the cubic capacity of a bike engine

ev1lsyk0 · 17th March 2009, 20:59

Hi all,

I'm no newbie as far as driving and riding are concerned, but I am one when you're talking about the mechanics of bikes and cars - that aside, I've got a Honda Unicorn (bought in Feb '08), and for quite some time now, I've been feeling that the bike just doesn't have enough in the pickup, low-end pulling power, and top speed departments. I thought of doing the usual performance enhancing tweaks like adding a performance filter and getting a better exhaust, but then concluded the performance gain and comparitive FE reduction was not worth the expense.

I've been a member of this community for a while now, and I remember reading something about increasing the bore of the engine (i.e. adding more cubic capacity and replacing the piston) on one or more threads. I got owned on the road by a kid riding a Karizma today

, and thought of this idea.

Is increasing the bore a good idea on a unicorn? According to what everyone says, the unicorn has the engine with the best build quality....

Has anyone here done it before? Does anyone know where I can get it done, and for how much? Are there any risks/hazards involved? (I hope not...)

17th March 2009, 20:59	#1 (permalink)
ev1lsyk0 Newbie Join Date: Jan 2009 Location: Hyderabad Posts: 13	Increasing the cubic capacity of a bike engine - pros & cons? Hi all, I'm no newbie as far as driving and riding are concerned, but I am one when you're talking about the mechanics of bikes and cars - that aside, I've got a Honda Unicorn (bought in Feb '08), and for quite some time now, I've been feeling that the bike just doesn't have enough in the pickup, low-end pulling power, and top speed departments. I thought of doing the usual performance enhancing tweaks like adding a performance filter and getting a better exhaust, but then concluded the performance gain and comparitive FE reduction was not worth the expense. I've been a member of this community for a while now, and I remember reading something about increasing the bore of the engine (i.e. adding more cubic capacity and replacing the piston) on one or more threads. I got owned on the road by a kid riding a Karizma today , and thought of this idea. Is increasing the bore a good idea on a unicorn? According to what everyone says, the unicorn has the engine with the best build quality.... Has anyone here done it before? Does anyone know where I can get it done, and for how much? Are there any risks/hazards involved? (I hope not...)