1150 carbs on an 1100

[Guest]

OK gurus. Here I am again

80 1100 sixteen valve w/ 1166 kit
83 1100 head ported, polished with 1.5 oversized intake valves APE hd valve springs
Webcams .340 degreed 108.5 108.5
GS1150 36mm carbs with Dynojet kit. 138 Dyno main Needle at third from bottom (a little lean so I'm going raise it one notch) 47.5 pilot Idle mixture screws out 3 to 4 turns.
Synced
Carbs were soaked in Berrymans and blown out with all new o-rings

Questions
Do you think the main is big enough. Seems a little weak on full throttle and heard 140 Mikuni main is a good start. Can you mix a Dyno needle and a mikuni main jet? I don't see why not since the needle sits in the needle jet.
Should I install the 160 Dyno pilot air srew? Stock is 125 and I think it was so small because of the BS California emission and I blocked off these vacuum nipples. Getting it to idle was a pita. It would idle for awhile and seem to just starve. Got it to idle but with 47.5 pilots and 3 to 4 turns out on the idle miture screws.
It doesn't have the pop it had before the head and the 36mm carbs. I do realize this is jetting and need some better starting points. I can spend another two days doing plug chops and trial and error but this why I am asking you gurus. (I know. Suckup. No shame in that game)

 

[salty_monk]

The pilot air jet on my California carb is bigger than the one on the Canadian carb (without the BS CA emissions stuff - it also came with notched needles).

Dunno if that's helpful but seems to be the opposite of what you assume in your post.

Good luck with it.

Dan

 

[TheCafeKid]

Totally uneducated question, but given that one jet size is based on the actual opening, and the other is based on flow, would the Dyna needles taper differently from the stock?

 

[Nicholaschase29]

The Dynojet jets are rated differently than the Mikuni jets. I heard that there is ~ a 20 jet size difference between them (I'm not sure in which direction) so your 138's are either like mikuni's 170's or more likely 120's. That's what i've read anyway.. I'll look later today


Nick

 

[RJ]

The kit that you have comes with the 138 main so it should be right. I have the same kit in my stock 1100E with 34mm carbs, pods and header. My needle is clipped on the second to last groove from the bottom, screws turned out 1 turn. I did not replace the pilot jets so they are what came stock with the bike. I did replace the air jets with smaller ones but not sure which. This setup runs great.

With the bigger carbs, valves, and cams it would not unusual to notice a dip in low end power due to decreased flow velocity and vacuum signal to the carbs, which would explain the large number of turns out that you have on the mixture screws.

Stupid question but did you install the kit or did someone else? If you didn't the PO may have not have drilled out the slides which would make the throttle response kind of sluggish.

Even if you did experience a drop in low end power it should more than make up for itself on the top end with your setup. I would put those clips on the bottom groove and see where you are with that. I wouldn't fool with the air or pilot jets since it seems your main issue is with full throttle.

As far as mixing jets I would stay away from that since the taper on the Dynojet needles is so different from the stock Mikunis.

Just my 2 cents.

 

[Nicholaschase29]

"Remember that DJ numbers are about 10 point's lower than Mikuni number's so your 120 DJ is like a 110 Mikuni."

From racing jake..

My mistake not 20...

 

[RJ]

Apples and oranges comparing Mikuni and Dynojet numbers. One is rated by flow the other by physical size of the orifice. There is a post somewhere here that has a link to a V-max website that has a table which shows you the equivalent Mikuni and Dynojet numbers. Poke around with the serach feature and you'll find it.

 

[Guest]

I installed the DJ kit and drilled the slides. Just looking for a good starting point on the main. If the DJ 138 compares to Mikunki 127.5 to 130 then I don't think the main is big enough. Stock mains are 122.5 and 120 on the 1150. I'm running .5 oversized intake valves compared to the 1150 and stock exhaust valves. The degree of the intake cam at 108.5 might be a problem on the lower end but the top end just isn't there as it should be.
I'll raise the needle one more notch and see what happens.

Put in the DJ 160 air jets and couldn't get it to idle.

 

[rapidray]

Bill, you should be in the 130-140 neighborhood to start. Ray.

 

[Guest]

I found a set of 137.5 locally. I'll try those out.

 

[Guest]

I found sets of 135 through 140 locally. I was really suprised. Had to hit three places. I really don't think they are going to be smaller than 135. At least I hope not. Better to be a little rich though.
This is gonna be great. :-D

 

[RJz1100E]

Hey Bill. Good luck, man.

 

[mac1170]

jetting

jetting

gday bill, i run a gsx11et, 1135 yosh pistons,98cfm flowed head,1mm bigger inlets,black motor cams,36mmcvs, later model standard airbox with kn filter,after much riding on road,track and dyno runs,we found the best combination of jetting was,please remember this is an aussie specs bike, we first ran the standard 36mm jets, and found that this ran the bike to rich all thru the range,we then put the 34mm, jets in the 36mm carbs and straight away it ran cleaner, in the end the combination was 120mikuni mains, standard 36mm pilots from memory 47.5mm, standard 36mm carb airjets 160s, 2.5 turns on the mixture screws, needle set in the middle notch, piont to note when you screw in the mixture screws dont do them down tight, as you can break the tips off and they stey stuck in the hole, in my humble opinion forget dyna jets they can confuse the issue, this bike runs 110hp.din. and 84ft.pds. on the dyno hope this helps, regards

 

[RJ]

Here's the Vmax site with the Mikuni/Dynojet jet comparison table: http://www.vmaxoutlaw.com/main.html.

 

[RJ]

Click on "Technical Info" and scroll down. It's in there.

 

[tone]

Does this help :-D

 

[RacingJake]

With the 1166, bigger valves, ported head and 340 cams you might need a 160 mikuni size mains \\/ but that all depends on what type of exhaust and air filter your running.

I'm with Ray....... at least a 140 mikuni jets to start.

Also try bumping your timing up to 36 degress for a few more ponies.

Give that a try and let us know

Good Luck

 

[Guest]

Thanks guys
Currently I'm running Mikuni 135 mains 50 pilots. I tried the 160 DJ pilot air jet but it wouldn't even idle so back to the 125s.
Pulls great. Still smoking at startup so I'm going to pull the cylinders and check ring gap and the oil ring. :|

 

[Kris V]

If ya need help Bill let me know.

 

[rapidray]

Thanks guys
Currently I'm running Mikuni 135 mains 50 pilots. I tried the 160 DJ pilot air jet but it wouldn't even idle so back to the 125s.
Pulls great. Still smoking at startup so I'm going to pull the cylinders and check ring gap and the oil ring. :|

Bill, how many miles on it now since you put it back together? I wouldn't be so quick to pull it apart because if it is rich still it could be washing the cylinders & slowing down the ring seal process. Do a compression test & a leakdown test before pulling it apart. Ray.