carb rejetting for pods KZ750 CSR

OK guys, I have an earlier thread w/a similar header, where I thought I had had it nailed. In that thread, I wrote that I had had good results using a 130 main and a 50 pilot. It wasn't perfect because I still had a bad hiccup transitioning from the pilot jet to the main. I could slowly accelerate to get through the transition but when I tried to do a hard acceleration from stop it would stumble bad...not good while merging into traffic. Since then I've tried just about every jet from 117.5 main up to 140 and 40 pilot up to 55 and nothing worked right. I, also, tried shimming the needles in conjunction w/the jet combinations. Most combinations were worse than the 130/50. A previously suggested combination of 42.5 pilots w/140 mains was one of the worst. I kept coming back to the non-tapered, blunt, stock jet needle just not working right, under load and the idiotic emission control underjetting. I did some more research and discovered that the Yamaha XS650 used the same Mikuni BS34 carbs. I also found out that an online store, MikesXS, sells the Canadian version (not emission control) of the jet needle/needle jets. Well, today I had my carbs sonic cleaned, found a bad o-ring on one of my float needle housings and put the Canadian jn/njs into my carbs and clipped the needle in the center, with 47.5 pilots and 125 mains, pilot screw 2 turns out from lightly seated. When she caught, after kicking it a few times, she started reving so high smoke was coming out of the exhaust and I thought maybe the cable was kinked. Anyway I backed the idle adjustment way down and got her to idle @ around 1k. This was the same idle setting I'd been using since I got her running and I had to back it way down before I got the idle right. I didn't have enough time to get out on the highway but took her out on the hilly road outside my place for a test ride. She performed almost perfect. Smooth shifting under load, uphill, all through the gears. Only got her up to about 45mph and the only problem is a bit of a "rattle" backfire in the mufflers under deceleration.
I think this means I may be running a little rich and unburned gas is detonating in the hot mufflers??? I will probably see what happens if I put 122.5 mains, maybe try to drop the pilots and play w/needle clip positions. Still gotta do the highway test but I think I've finally beaten the 750CSR/pods/jetting problem wooohooo
I'll let y'all know how the highway test goes but I'm very optimistic
Ron
BTW I've also found a guy on ebay that sell a plate, for the vulcans, that caps off the, valve cover, reed valves perfectly on my KZ. I hope this helps everyone that wants to get rid of the airbox.

Post edited by: ronjones, at: 2007/09/29 23:50

Post edited by: ronjones, at: 2007/09/30 20:53

might wnt to do a plug chop to see how rich\lean it is on the mains. There might be more to be had. poping on decel usually means lean condition at the pilots.

thanks nads, I've got a new set of plugs just waiting for the plug chop test, but I wanted to wait until I got the accel problem licked. One of the reasons I thought it might be a little rich on the mains, causing the popping is because the "rules of thumb" I've read, 3 up on mains 1 up on pilots, from stock, for pods and pipes, would be 122.5 mains and 47.5 pilots. Since I now have the option of clip position, do ya think lowering the clip position (raising the needle) might be a better option than lowering the pilot to stock (45)? 115 is stock size for the mains.

Took her out on a, 30 mile, test ride today. Hiway, up to around 70mph@ around 5100rpm, US routes, twisties, country roads, uphill @ low rpm in 5th, she was just about perfect. She's got more power than she ever has, kinda scared me @ 70mph, and had plenty left to give. Still, having that, bladdy-bladdy-pop-pop, muffler backfire comming down from hi accel. I haven't done any more find adjustments, yet.

Post edited by: ronjones, at: 2007/10/03 16:33

Soooo.... who is this guy that sells those plates? Got an address?

Bluemeanie wrote:

Soooo.... who is this guy that sells those plates? Got an address?

Sure, this guy:)
motors.search.ebay.com/_W0QQsassZfwsanco

Post edited by: ronjones, at: 2007/09/30 21:01

Post edited by: ronjones, at: 2007/09/30 21:22

Ordered needle jets and jet needles today. Hoping this gets her running strong.

Skullcrusher wrote: Ordered needle jets and jet needles today. Hoping this gets her running strong.

Why are you posting on an 8 1/2 year old thread?
What does your post have to do with this discussion?

I'll dig up old threads if I want, I didn't notice any rules against it. Was hoping op was still active to maybe offer an update on any additional tuning. What's your beef anyway? You took the time to ask these two questions that have nothing to do with the original topic, one of them asking me what my post had to do with the topic (which btw, if you read the thread you would know).

Go riding. You got too much time on your hands.

usually it's best to link old threads and start your own. if you want to contact someone there is a PM feature. your post is quite vague with no immediately noticeable contribution. No rules against it, just etiquette. :whistle:

Skullcrusher wrote: I'll dig up old threads if I want, I didn't notice any rules against it. Was hoping op was still active to maybe offer an update on any additional tuning. What's your beef anyway? You took the time to ask these two questions that have nothing to do with the original topic, one of them asking me what my post had to do with the topic (which btw, if you read the thread you would know).

Go riding. You got too much time on your hands.

Wow.

Maybe this will help .....

If you click on the original poster's ID (in this case ronjones) his profile will appear. In it you can see the last time he visited KZRider. In this case the last time ronjones' "Last Visit Date" was 30 Nov 2014, so it is unlikely, although not impossible, that he would see your comment about jets.

Not trying to bust your balls, and you certainly didn't break any rules, it just seems like starting a new thread would be a better idea, especially if you can then follow up on with what bike you jetted, what jets were used, and whether or not the rejetting improved performance. That info sharing could be very helpful for someone else with the same bike who needs to rejet. Ed

OK....

Instead of starting a new thread and tapping away at my phone entering all the info that can be found above, I'll clarify.

I have same bike as op. 82 750 CSR. Got it without an air box. Has those cheap emgo pods. Currently have 125 mains and 50 pilots. Needle clip one down from middle. Waiting on the Canadian spec needles and needle jets to come to see if I get the same results op did. Currently falls on its face above a quarter throttle. Also fishing around for better filters until I can find a reasonable deal on a stock air box. Also fixing all the other idiotic shit the precious owner did to it like fitting two huge automotive ignition coils and flipping the reed valves in the emissions system upside down.