SV1000 throttle bodies on a 650?

Originally Posted by yorkie_chris

Yeeeas but they're big-bore with cams and porting. IIRC. Also still nowhere near the size of the TL TB's.

stock motor with cam swap.
only difference between runs is bored tb's.

and this is 2mm over motor,again same change,tb's.+ 4hp.

and not only on sv but also on ninja 650.
difference between red and blue is 6mm bigger tb's.

does any one know the procedure for this do you bore all the way down do you have to make new butterflys any help appreciated.

[fastdruid]

So to sum up, bigger TB's are good for ~4BHP but do TL/SV TB's fit or not?
Or are they too big?
Or would the EFI not cope without a (very expensive) custom EFI ECU?

Not that I care having a carbed curvy but I keep thinking about having a play with FI[1]

Druid

[1] And megasquirt

Originally Posted by antony

does any one know the procedure for this do you bore all the way down do you have to make new butterflys any help appreciated.

both

ok cheers i have a lathe so not a problem i gues you have to make the butterflys as these cant be bought off the shelf 2mm bigger

thanks all

[Ratty]

Originally Posted by fastdruid

So to sum up, bigger TB's are good for ~4BHP but do TL/SV TB's fit or not?
Or are they too big?

The 650 and 1000 lumps have the front cylinder off set opposite hand so they couldn't fit regardless of size.

Ratty

[yorkie_chris]

Meh. TB's are only on steel plate. Easy to move, just remake plates and linkage, easy to offset. Have welder, will hammer.

But as zadar says you don't gain much over bored TB's to huge ones like TL.

There is a point that whatever you gain in reduced dP you will lose in reduced charge velocity and charge mixing.

[fastdruid]

AFAIK SV1000 have 52mm, SV650 39mm and the graphs are from what, 2mm over so 41mm? So SV1000 (and presumably TL) are massively large then.

You'd probably be better off trying a set of hayabusa TB's (44mm AFAICT) if the SV1000's wont fit straight on, might even be able to re-use most of the existing bits from the 650's TB's. They are after all designed for *exactly* the same size cylinder!

I'd try it myself but I've got a curvy


Druid