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 ]