650 top end on 550

[dansofield550]

i couldn't see any of the pictures on dcripper's post so thought i'd put some of mine on , nearly got all the parts to start re-assembly just waiting on new cam chain, i'll be fitting vm29 flatslides instead , taken from a 85 gsxr750 , ported and cleaned up the inlets etc ,

[dansofield550]

couldn't seem to buy any inlets to suit my 650 head and flatslide carbs so made some of my own,
[URL=http://s238.photobucket.com/albums/ff278/dansofield86/?action=view&current=IMG_2491.jpg]


matched them to cylinder head to aid flow , now carbs can be mounted using rubber hose cut to length and held on with hose clips

[Matchless]

Excellent work! That's what I need for my GS1000! Did you slot them on the motor side for the o-rings as well?

[dansofield550]

sure did, i used the o rings from the 650 inlets i had, just made the groove 0.006" shallower to make sure the rings have a good contact

[brveagle]

Wow, very impressive. Let me know how those flatslides work out for ya. I wonder how much performance they offer over the stock CV's.

Where are you located?

[boontonmike]

I am doing a similar build and have some 32mm flatsides. Saw you are running 29's. let me know how that works out as I'm a bit worried I'm going to be overcarbed.

[7981GS]

IMHO/E I would think that the 29mm carbs would be over-kill.
Unless the compression ratio is increased to about 10:1 and the camshafts have more lift/duration.
I run them on an 1100 2-valve (true 1100, not 1074) and they are a perfect match with the small port heads.
As for the 32's, ask anyone that has made the mistake of putting 33's on even a small port 1085 with adapter manifolds.

Daniel

[7981GS]

Dansofield, your work on porting the head and making those intakes is FANTASTIC!

Daniel

[dansofield550]

the head has been skimmed , but unsure what compression it'll have , will wait and see on that, i did wonder if 29's would be too much . was gonna fitt 850 carbs think those are 26 but as it'll be wide open most of the time (ball size permitting ) figured i'd give the 29's a go

they are carbs from a 85-86 gsxr750 , don't think you guys (us) had these fitted to your gsxr's

[GregT]

Those early GSXR 29's are very tuneable - all the jets interchange with RS series flatslides and you have the option of running one,two or no accelerator pumps.
The racekit version for the 750's was the same carb but 33mm straight bore instead of the entry side reduced to 29mm - the engine side is already 33.
Nice work.

[dansofield550]

interesting you mention the accelerator pumps, these carbs have 2 , but the springs are missing from under the plungers in the float bowls, was wondering if this was done for a reason or previous owner had lost them!

i have 110 main jets fitted and they look suspiciously brand new .

[GregT]

No springs - pumps won't work. Any small spring which fits will do the job - cut down biro or similar. All they do is return the plunger and operating rod ready for the next stroke.
Usually to disable the pump(s) it's easiest to pull the rods which operate them.

[dansofield550]

had a go at making some velocity stacks , didn't seem that hard to do, i had some 6082 alli tube knocking about so cut to length and annealed it so softnen it , used a cutter holder to form the taper then pressed a 50mm bar in the other end to make the carb dia ,turned a nylon block with a rad and press the flair on the inlet end then 5 min's in the lathe to rub down,

looked a lot better than i though i'd be able to do , a few didn't go right though!




[IMG]http://i238.photobucket.com/albums/ff278/dansofield86/IMG_2493.jpg[/IMG

[Matchless]

Where there is willpower, tools and material many things can be done!
Excellent work!

[boontonmike]

IMHO/E I would think that the 29mm carbs would be over-kill.
Unless the compression ratio is increased to about 10:1 and the camshafts have more lift/duration.
I run them on an 1100 2-valve (true 1100, not 1074) and they are a perfect match with the small port heads.
As for the 32's, ask anyone that has made the mistake of putting 33's on even a small port 1085 with adapter manifolds.

Daniel

I forgot to mention that they aren't true flatslides. they are actually the Mikuni CV carb just with a flat slide vs the round. They're not a cable actuated flatslide type carb. I think that makes quite the difference. Still unsure as to how it'll work.

Sorry not trying to jack your thread, those tunnel rams are awesome. I'm assuming you have access to a pretty good assortment of machining equipment as all your parts are turning out top notch. Very inspiring to get me on the ball with my engine.