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SMC Bore Kit

18K views 28 replies 11 participants last post by  J Banning 
#1 ·
I'm sure this has been discussed before somewhere at sometime but I need insight on this. I am thinkin about goin bigger on my 625. Yep!, I want more kahunas outta the beast. Rather than trade in and setup up to a new monthly payment. I'd rather upgrade and mod it out a lil.

Is it worth it? Will the squeeze be worth the juice? Anybody know who makes the kits? What I need to change out to make this work? i.e the case, cams etc. Or if this is even possible? Cause and effects?

My google searches are coming up empty. Thanks in advance!:thumbup:
 
#2 ·
hmmmm.

AFAIK, there is no bolt-on big-bore 'kit'.

i know there is a cam, and with enough money, i'm pretty sure the cylinder can be overbored, re-coated, new piston installed, have a stroker crank made, have whole motor lightened-balanced/blueprinted.

might as well buy a multi cyinder/more powerful bike too.

also, there is a 660 motor, but i'm pretty sure it's still 625cc.

however, and you've likely already been told, your money would be better spent on having the suspension sprung and revalved for your weight/riding style, a new pair of tires, and multiple trackdays/schools of learning.

a wise sage once told me: 'if you're riding that bike to 100% of it's potential, you should probably quit your day job' LOL, and i was transitioning from an EX500 to a CBRF2 at the time wayy back in 1996......
 
#5 ·
a wise sage once told me: 'if you're riding that bike to 100% of it's potential, you should probably quit your day job' LOL......
That is very true, a regular rider can't get nowhere close to the full performance of some of today's sportbikes...on the street (or even on the track).
Not being cocky, I include myself there as well.
I just laugh when I see some people on 180 bhp street bikes or 70 bhp supermotos..when a 250 to 600 cc bike would be PLENTY.
Sorry for the threadjack.
 
#6 ·
There is a bigger kit from KTM - but I don't think they sell/make it anymore. It's a new cylinder/piston/crank and puts capacity up around 700cc (I've a friend who just bought the lot on ebay a few weeks ago! :thumbup:). Also, the 660 is actually 660cc, but I don't think that went to the states. :headscrat
 
#7 ·
5843000510023 CYLINDER D=101mm DIECASTING 03 2005 625SMC
58430018300 CRANKSHAFT CPL. LC4 05
This is the OE #'s for a 2005 SMC... bore 101mm x Stroke 78mm

NOW CHECK THIS:
2005 660 RALLYE LC4
5853000530030 CYLINDER 102MM 660 RAL. BLA.04
58530018300 CRANKSHAFT CPL RALLYE 2002
58530007300 I PISTON I CPL.D=102MM 03

Here is the #'s for a 05 660 that is Bore102mm x Stroke 80mm

You want bigger??? How much money you have??
 
#14 ·
ya gotta remember about HP #'s, that they will always vary on whose dyno it was done, and even the conditions from day of each individual dyno, and that's not even opening the can of worms concerning the manufacturers stated HP #'s...are they talking about crank or rear wheel HP????

just alot of variables there....suffice to say if you have enough money to do a bore and stroke jobbie on your 625 by all means go for it :arsenal
 
#16 ·
the 660 is common LC4model over here, and it only had 2 hp and 3 nm more than the 625, so to put so much effort and money too gain only 30cc and minor performance changes (660=654cc) is a waste of time and money.
the biggest difference between the 625 and 660 was the aloy subframe, no E-start, no battery,...

better tune the stock 625cc motor or go big (the biggest bore was 720cc for a LC4)
 
#17 ·
I just got done reading about all the bore and stroke number and the relative HP they can or should put out. I would have to agree that for only a few more HP than what I got, it just not worth it to do the 660 upgrade, plus I like my estart to much:lol: I want to see 65rwhp or higher to make this worth my time.

BUT, and this is a BIG BUT. If it possible to get all the parts I need to complete a 693, 709 or as you said the 720. Then I would consider it. I'm thinkin of doing this just for fun and on the side. If I can get it completed before I die then I'd throw it in the bike.

I'm goin to start looking into the availability of parts. Thanks guys for all your help and input so far.:thumbup:
 
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