SV1000 throttle bodies on a 650?

[yorkie_chris]

Megasquirt?

Hayabusa could be a good call. Remember even if TB is huge you still need a smooth inlet tract so the inlet rubbers might be a problem.

[fastdruid]

Originally Posted by yorkie_chris

Megasquirt?

Yeah, an open source FI ECU, not fantastically expensive (although not cheap) and fully programmable.

Hayabusa could be a good call. Remember even if TB is huge you still need a smooth inlet tract so the inlet rubbers might be a problem.

You'd think so but IIRC I've seen somewhere that that's not always the case, here we go, now I don't know if this applies to modern bikes but from
http://www.beezanet.com/beezagent/ro...%20memoirs.pdf

One of the strangest occurrances to do with carburettors was when one day Reg Wilkes sent an apprentice from the test shop into our,
main shop for a 1 3/32 GP carburettor and he misread the size and gave Reg: a 1 3/16th carburettor and they immediately got quite a
jump in power. They reported this to me and I went to the shop and the test was repeated and there was no doubt it was quite a gain in
power. I suggested to Reg to open the port to match, immediately we lost what we had gained plus a bit more, so we made a thin
sleeve and pressed it in and the power was back. We repeated this on other engines always with the same results. A number of private
owners of DBD Gold Star noticed the carb being bigger than the port and opened up the port thinking to gain power, but not having a
dyno were not aware of the results. Later on we fitted a venturi behind the carb and picked up even more power. The smallest diameter
of the venturi could be 80% of area of the carburettor. We tested this on several engines and it always worked and seemed to improve
carburation.

Druid

problem with big tb's are than hole is to big to match intake boot, you would need to make reducer at which point you defeating its purpose, to be bigger.
Hayabusa tb's may be 2 together, have not seen them. If they are you would need to cut them on half
On the end stock ones bored out to 42mm work good and everything else is pain.

[fastdruid]

They are individual ones, of course how hard it is to split them is another matter...

Druid