Jetting Report Part 4

[Anonymous]

Well, the weather finally cleared enough to get out for a test ride with the latest settings. They are:

Pod filters
142 Main jets (up from 140's)
Mixture screws at 3 turns out
47.5 Pilot jets (these are stock size)
OEM needles in #3 (of 5) groove (lowered one groove)

This pretty much did it. The stumble at full throttle in 5th is almost completely gone now. It will take full throttle from 2000rpm and just pull all the way to redline now. It gets slightly rough (just enough to barely notice, not bad at all) from 6000-7500rpm then rips to redline (and beyond) very nicely. In the lower gears it simply wails all the way to redline with no noticeable roughness in the 6000-7500 ranges. Pulls really hard pretty much everywhere and will take full throttle hits from low rpm in any gear with no stumbles, coughs or other complaint. It actually feels significantly stronger than my ZX-9 below 6000rpm. Lots of fun now.

It was a pretty cold day (5C, freakin' cold @190kmh... ) when I tested it, so I expect the stumble to come back a touch in summer when things warm up a bit, but I will wait and see before I worry about that. I figure I can make it perfect by running the needles in the #2 groove (from the top) and shimming them to be midway between the #2 and #3 height. I will keep this in mind if it gets noticeable again when summer finally arrives. I have yet to install the GSXR coils I have, that should happen this week and hopefully the stronger spark will also contribute a bit to eliminating the stumble.

Now its time to wear it out and have some FUN.


Mark

[Mr. Jiggles]

Mark - are you running a stock engine (other than pods and header)? Also, are those mikuni mains you're using or the DJ's? Just curious.

[RacingJake]

Good Job, Sounds like you found the sweet spot.

If you ever go to the track you can probably find alittle more power with bigger jets.

[Anonymous]

Mark - are you running a stock engine (other than pods and header)? Also, are those mikuni mains you're using or the DJ's? Just curious.

Otherwise completely stock. I also degreed the stock cams to the stock lobe centres of 110/109 intake/exhaust. The intake timing was way off from the factory and I am sure I picked up significant power from that, as well. It is much stronger than last year when I bought it and runs about as hard as my ZX-9 up until the aerodynamics and top end power of the 9 take over. Way more torque down low, though. And a lot more fun overall.

I used Mikuni jets because my OEM needles were adjustable. No jet kit at all, just adjusting the stock needles, mixture screws and new main jets. I think the Canadian models didn't get the emissions issues with covered mixture screws and non-adjustable needles until into the 1150's. If anyone wanted to avoid the typical Dynojet issues, ordering a set of Canadian spec needles and jetting it from scratch would be a reasonable way to go. Typically, the Dynojet kits are very rich in the midrange, which hurts performance and mileage and gains nothing. The stock needle has a very shallow taper and allows very fine control of the pilot/needle transition and low throttle needle operation. Just a thought for those leary of tackling the Dynojet monster... Just for reference, the only tank where I got a good mileage read from (my odometer doesn't work yet) I got 46mpg in mixed highway/city riding while commuting and running around town. This was with the richer needle setting, as well. It should now do a bit better than that. Certainly not the drastic mileage drop off predicted when going to pods and a pipe...


Mark

[Detman101]

Wow, that's awesome. I can't wait to get mine fine-tuned.
I've given up on mods myself. I'll let the shop do the tuning from here out. I've gotten it close enough heh.

Dm of mD

[Anonymous]

I've given up on mods myself. I'll let the shop do the tuning from here out.

But where's the sport in that?

I'm afraid to let anybody else touch my bikes. I have heard so many horror stories from dealer servicing that I will never take a bike to a shop if I can help it. My next plan for the 1100 is an 1166 kit in a season or two and the only work I will not do myself will be the cylinder boring. Everything else will be done in my garage. At least if it goes wrong then, I know who to blame...

Mark