[Flying Scotsman]

I've just received a stage 3 dynojet kit(3122) to fit the 36mm CV slingshot carbs i'm fitting to my 85 GSXR 750.
I noticed that the kit instructions require you to fit "correctors" into the two slide lift holes. Problem is my slides only have one lift hole in them. What should I do? Has anybody else come across this problem.
Thanks in advance.

 

[FastCat]

Not me... my 36's had the two holes in them... are you *certain* that the carbs you have are actually 36mm "slingshot" carbs from a gixxer? there are *lots* of other "flavors" of 36mm Mikuni CV carbs.

 

[88/750]

FastCat has a good point, and I can't remember if mine had two to start with or not, but you could probably just drill another hole to fit the other one if you want. However, I do remember running mine with one "corrector" and one hole drilled for it but not installed on each slide. I had some kind of "wild-hare" idea that the slides would really open like that, and I think I was right. They worked great like that. If you do this and you don't like it, I bet you can cover up that hole with a piece of scotch tape or some other fashion of plug and it'd be good as new. Or you could first drill a hole with the same size hole as the "corrector" to test it before drilling the big one to fit it.

[ 05-02-2002, 12:06 AM: Message edited by: 88/750 ]

 

[Flying Scotsman]

[After much head scratching and research i've found out why my Dynojet kit doesn't fit or match up properly. My 36mm GSXR 750J/K carbs are actually off a GSXR 1100K/L. Looks like it,s back to the drawing board.Argggggggggggggggh !!!!
If anyone has a set of 34mm CV carbs off a GSXR 1100 G-J for sale please let me know cos i'm gonna fit them instead.

 

[88/750]

Don't give up hope just yet. If you've already returned the jet kit, you may possibly still get good results by installing some stage three sized jets (I think they are #144's or something close)with your stock needles and adjusting the float level, and maybe drilling some holes to the size of those "correctors".

 

[Flying Scotsman]

My carbs are already fitted with 144 main jets. The bike has been on the dyno and it is suffering a huge mid range flat spot. The bike was running rich in the mid range so I dropped the needles as far as they could go and it is still far too rich. I could by the stock needle jets for the 750J and fit them along with the Dynojet kit for the 750J, but Suzuki want £14 UK pounds (whatever that is in dollars)each for them, and i've already spent a fortune on buying the carbs,filters,race can etc.etc so i'm a tad pi**ed off and broke at the moment. Thanks for the advice though.

 

[88/750]

Is your float level too high? Try a local cylce shop, main jets should be way, way cheaper than that. I think the stock size was #125, but if you've got a pipe that's probably too small. Maybe a main jet size somewhere around #135 would work for you?

[ 05-02-2002, 06:44 PM: Message edited by: 88/750 ]

 

[Flying Scotsman]

My float level is set at a standard 14.6mm. What I meant by "needle jets" were the emulsion tubes that the slide needles fit into.With regard to the main jet, the top end of the bike is spot on mixture wise so In don't want to down jet. Basically the pilot circuit and main circuit are ok, it is the needle part of the system that is giving me all the grief.ZZZZZZZZZZ Hope i'm not boring anyone.

 

[somejeffguy]

the emulsion tubes on these carbs wear out very quickly.....and cause richness when they do. there's no way around it except to replace them.

 

[FastCat]

Originally posted by Flying Scotsman:
My carbs are already fitted with 144 main jets. The bike has been on the dyno and it is suffering a huge mid range flat spot. The bike was running rich in the mid range so I dropped the needles as far as they could go and it is still far too rich. I could by the stock needle jets for the 750J and fit them along with the Dynojet kit for the 750J, but Suzuki want £14 UK pounds (whatever that is in dollars)each for them, and i've already spent a fortune on buying the carbs,filters,race can etc.etc so i'm a tad pi**ed off and broke at the moment. Thanks for the advice though.

<font size="2" face="Verdana, Arial">My understanding is that if you use the dynojet kit, you *must* use the dynojet emulsion tubes... the factory pro instructions were *emphatic* that if you install a factory pro kit in carbs with DJ emulsion tubes, then you *must* replace the DJ stuff with OEM emulsion tubes. The best price I found for the OEM tubes was at Ron Ayers (I have no idea if they can ship overseas). The factory pro kit uses the OEM emulsion tubes along with Mikuni #0985h-68t.8_std needles, and suggest restricting one slide hole completely, and leaving the other hole alone. The instructions also called for raising the float level to 15mm. I followed those instructions and ended up with #155 mains for best top-end/WOT and actually had to tune out a lean spot in midrange/partial throttle... admittedly, it's a different motor than yours, YMMV. I'm still just a *tad* lean on the needles, but when I raise the needles, I start having trouble with throttle response at low RPM/small throttle opening so I've settled on best driveability vs. best dyno numbers. I still cranked 84 ft-lbs and 131 HP out of the beast. :-D

PS... about the money thing... I learned a secret about making a small fortune while playing around with motorcycles... the secret is...

...start with a *large* fortune.

[ 05-03-2002, 10:01 AM: Message edited by: FastCat ]

 

[Flying Scotsman]

I've decided to bite the bullet and order a set of new emulsion tubes and play around with the jetting(no Dynojet kit though). Ron Ayers can supply the emulsion tubes for $12.90 each opposed to the UK price which is equivalent to $21.09, Although i'm waiting to find out if he'll ship them to the UK. I don't know why but us Brits get shafted for everything from Scotch Whisky to Japanese bike spares. Anyway apart from having a good moan about prices(probably something to do with the bottle of wine i've just demolished), what I meant to say was thanks for the advice and hope that you've given me guys and gals.

 

[bcjohn]

Emulsion tubes aside.....aren't 144s rather large for your machine? Keep in mind that while big jets will show nice power on top, they *can* screw it up lower down. Essentially, you can drop the main size without killing the top end and bring the midrange into life.

The engine's "need" for the main jet goes up kinda linearly from zero at idle to orgasm at top rpms, ergo its farking easy to inject flat spots by putting in a garden hose.

Yeah, I don't know why you guys in the UK get fucked price-wise. Especially since you manufacture some of the sweetest accessory shit in bike-dom.

All the best!