Carbs question.

henk · Post by **henk** » Fri May 20, 2005 3:16 pm

Hi all. Earlier i asked tips, for setting up the carbs of my fzr1000 '94. There is many information and i'm nearly done. "nearly" The thing is, it runs great, idle, middle & top. Acceleration is great to. Only 1 minor, if approching a corner, mostly at racing speed and closing the gas, the machine seems to get some extra speed. A split second it increases acceleration, before reacting normaly on decceleration. This is mostly between 5000 and 9000 rmps. It looked to me as it's to lean when accelerating, so i rased the needles 1 step,this made the top end much worse. changed it back and turned out the idlemixture screws to 3,5 turns, negative to. I red something about "feul bowl hoses removing" ,can this be the problem on an FZR ? Can it be the result of floatlevel of the carbs ?? I checked the exupvalve settings and movement, found nothing wrong. Positoned a fraction (2mm on the hole) more open than standard, advanched. specs: FZR 1000 '94 75.000 km (new pistons an intakevalves at 55.000 km) &nbsp &nbsp &nbsp &nbsp Seatpipe &nbsp &nbsp &nbsp &nbsp std airbox and filter &nbsp &nbsp &nbsp &nbsp Dynojet needles, new std emulsiontubes. Dynojet mounted according specs. Mainjet 134 &nbsp &nbsp &nbsp &nbsp Rest is std. Any suggestions ???????????????????

ExupElvis · Post by **ExupElvis** » Fri May 20, 2005 6:11 pm

134 is a really big main jet for a stock engine Henk, maybe go back to a 127.7 for inside cylinders and 130 for #'s 1 & 4. At the engine speeds you mentioned it sounds like main circuit troubles to me, so "slide/needle/main jet" set-up should be a good place to look. Did the Dyno Jet instructions say to drill out the slide vaccum balance holes? The factory Pro kit says to do that.  cvhjkthis

henk · Post by **henk** » Fri May 20, 2005 10:26 pm

yes i did some drilling, as explained in the Dyno instrction. If the main jets are to big, how do you explain that acceleration in the 5 gear takes me very rapidly to nearly 300 kmh when touching 11.500 rmps. The high topspeed is a result of rhe endgear ,it's from an yzf 750. when raising the needles 1 step this end section, takes a lot more time and stucks around 10.000 rmps. I think ,for above 7000 rmps the setting is correct, it's a real beast. thx for replying, Henk

ExupElvis · Post by **ExupElvis** » Fri May 20, 2005 10:44 pm

I guess I don't know exactly why it would surge then Henk, I looked up the Dyno Jet specs and it looks like maybe they supply their own jets as opposed to using different sizes of Mikuni jets as some of the other suppliers do, so the sizes may not directly correspond. So lean surge when closing throttle at higher RPM's is my guess, I would like to hear what you find from additional tuning.  cvhjkthis

dragracer1951 · Post by **dragracer1951** » Sat May 21, 2005 8:20 am

I wonder if this is a lean surge caused by trying to jet around the emulsion tube???? 7 to 9K is the needles... I'd look at the diaphrams too... Jim <img src="http://img.photobucket.com/albums/v209/ ... Cheers.gif" style="border:0;"/> <img src="http://img.photobucket.com/albums/v209/ ... states.gif" style="border:0;"/> Hey Kid...Is my taillight working?

henk · Post by **henk** » Sat May 21, 2005 11:18 am

I don't understand the term "lean surge" please explain. Tommorow i'll have my sunday trip (250 km) This afternoon i set the idlescrews to original 3 turns, Tommorow will give new information maybe. I have to say, with the old emulsiontubes i didn't have this problem, it occured after mounting the new ones. The gasreaction upwards is perfect, like a cannonball it goes. Men it's a beast. My mates drive Blade, R1 , GSXR1000 and Thunderace, mostly no match for me and FZR, not in the corner, sprint, only on top the gsxr (2005) is faster ,slightly.

flyingcircus68 · Post by **flyingcircus68** » Sat May 21, 2005 2:45 pm

I had a dynojet stage 1 jet kit on my original carbs (87) and I realize that the exup carbs are different and will require bigger jets, but it should be fairly close. there were 3 sets of jets and they recommended starting with the leanest and jetting up, if required. the jets started at 098 and I believe the alternates were 102 and 105. I know that dynojets are rated different from the mikuni type (110 on stock miks). Anyways, the point is, I agree that 134 sounds way too rich for dynojet and I suspect that might be for the stage 3 kit, which was meant to run without the airbox. Maybe someone else can confirm what size jets come for exup stage 1 jet kit. <img src=http://www.ezboard.com/images/emoticons/smokin.gif ALT=":smokin">

henk · Post by **henk** » Sun May 22, 2005 4:34 am

std jets are 125 ( in manual to)

dragracer1951 · Post by **dragracer1951** » Sun May 22, 2005 6:45 am

FC I think stage 1 are 120, 124 and 128 mains These are dynojet numbers and have ZERO relationship to mikuni jets. my 95 1040 runs 120 dj jets clip #2 and 2 1/2 turns out with 14mm of float level. With 124's it will rev to redline but not as strong as with the smaller main. These kits are VERY rich Jim <img src="http://img.photobucket.com/albums/v209/ ... Cheers.gif" style="border:0;"/> <img src="http://img.photobucket.com/albums/v209/ ... states.gif" style="border:0;"/> Hey Kid...Is my taillight working?

henk · Post by **henk** » Sun May 22, 2005 7:25 am

A copy off the manual, i looked at an american manual for the same bike and it lookes very different. It performed very well this morning ,maybe a bit leaner, but for now i leave it this way, will check the sparkplugs tommorow. 1. Remove vacuum slides from carbs. Remove stock needle and spacers, noting order of assembly (Fig.A). Using the slide drill provided (DD #32), enlarge both slide lift holes (Fig. A). 2. Install Dynojet needles on groove #3 from the top. Use all stock spacers (Fig. A). Install the small Dynojet washers above the e-clip. After installing the slide in the carb be sure to check slide movement manually before air box installation. 3. Remove the stock main jets and replace with Dynojet mains provided. If you are running the stock exhaust install the DJ128 main jets. If you are running an aftermarket exhaust or slip-ons with high flowing baffles use the DJ132 main jets. Be sure that the jets you are changing are the main jets. 4. Locate the fuel mixture screw (Fig. B). Carefully turn the mixture screw clockwise until lightly seated, then back out 3 turns. STAGE ONE INSTRUCTIONS Fig. A Place E-clip in groove #3 from the top Fig. B STAGE THREE INSTRUCTIONS 1. Remove vacuum slides from carbs. Remove stock needle and spacers, noting order of assembly (Fig.A). Using the slide drill provided (DD #32) enlarge both slide lift holes. 2. Install Dynojet needles on groove #3 from the top. Use all stock spacers (Fig. A). Install the small Dynojet washers above the e-clip. After installing the slide in the carb be sure to check slide movement manually before air box installation. 3. Remove the stock main jets and replace with Dynojet mains provided. If you are running the stock exhaust install the DJ138 main jets. If you are running an aftermarket exhaust or slip-ons with high flowing baffles use the DJ142 main jets. Be sure that the jets you are changing are the main jets. 4. Locate the fuel mixture screw (Fig. B). Carefully turn the mixture screw clockwise until lightly seated, then back out 3 turns. 5. Using the main air plugs (DCO400) provided, plug the main air passage (Fig. C). Place the plug in the carb flat end first and tap in lightly. **If experiencing fueling problems below 4000 rpm under full throttle that the needle can’t fix, try changing the fuel level. If you feel it is too rich, lower the fuel level. If you feel it is too lean, raise the fuel level.

dragracer1951 · Post by **dragracer1951** » Sun May 22, 2005 10:23 am

did you install the air corrector in the main air jet? If so then that's part of your problem. I have never personally seen the air corrector work and have had Dynojet tell me not to use them in order to clear up some low rpm problems (richness) Go back and use the smallest jets they gave you. Clip in #2 position from the top. float level 14mm and 2 1/2 turns out on the pilot air screws Lemme know what ya think Jim <img src="http://img.photobucket.com/albums/v209/ ... Cheers.gif" style="border:0;"/> <img src="http://img.photobucket.com/albums/v209/ ... states.gif" style="border:0;"/> Hey Kid...Is my taillight working?

henk · Post by **henk** » Sun May 22, 2005 11:33 am

the floatlevel is the only thing i didn't touch. I red about it a few times, saw the parts on the carbs, can't get a clear picture , how it's measured ( at what point) and under what condisions. Cause there's no sign of differents between the sparkplug collers I didn't veld it be necessary. But it's sure worth a try, so i'll make some changes, as suggested ? I'll let you know the results. thx, Henk. PS. I mounted a seatpipe , so that can make a differents to.

Post by **jjs777** » Tue Jun 21, 2005 2:38 am

whats a seat pipe ? -John  <img src="http://img.photobucket.com/albums/v485/ ...   <a href="http://img.photobucket.com/albums/v206/ ... cement.jpg" target="top">1995 FZR1000</a>  <a href="http://img.photobucket.com/albums/v206/ ... 00x600.jpg" target="top">1990 FZR1000</a>  <a href="http://img.photobucket.com/albums/v206/ ... resize.jpg" target="top">1990 FZR1040</a>

mynewbike · Post by **mynewbike** » Wed Jun 29, 2005 1:35 am

Hi I have a carb problem as well. The engine will run but seems to be running a lot cooler on #3 cyl.When I take the bike for a boot it will come on around 4-5000 rpm and fire properly and man do I have to hold on tight lol. I figure it must be a blockage in the pilot jet area ? Anyone have any other ideas? I'm running the oem filter and 130 mainjets on #1 and #4 and 127.5 on # 2 and 3. The bike also has a V/H slip on. Tomorrow I will do a full tech inspection ie compression,plugs ,exup and clean and sync the carbs. Since I have the airbox of I'm contemplating using my oval K/N pod filters.Does anyone have any suggestions for the jetting? Also what size would be a good starting point for the pilot jet, I'm going to splurge and replace the emulsion tubes at the same time. I live at sea level if this would be a concern as far as the jetting goes? Mike

dragracer1951 · Post by **dragracer1951** » Wed Jun 29, 2005 6:49 am

Are those Mikuni jet #'s? If so then I'd say you're a little rich. This would be born out by the cyl that's not fireing... Check those plugs and while youre are there...take and cut a quarter inch of iggy wire off at the plug connector end and recew the plug caps back on I've tried 40 pilots and went back to 37.5's as the 40's blubbered like a drunken lovesick sailor..... Oh Gawd Pleeze do not use them pods. Jim <img src="http://img.photobucket.com/albums/v209/ ... Cheers.gif" style="border:0;"/> <img src="http://img.photobucket.com/albums/v209/ ... states.gif" style="border:0;"/> Hey Kid...Is my taillight working?

mynewbike · Post by **mynewbike** » Wed Jun 29, 2005 6:39 pm

Ok I promise no pods LOL I have the mikuni jets in there. I did a compression test and it was 155 psi on 2 of the barrels,I didn't bother with the other 2 since they are really hard to get to. I checked #3 cyl and the comression seemed healthy with 155 psi?.Put some new plugs in and still not running properly on #3. If I whack the throttle open it will run so I'm thinking the pilot jet circuit. I got the carbs of and I will be taking them to the bike shop they have a sonic gizmo that will clean them I was told. Mike

dragracer1951 · Post by **dragracer1951** » Wed Jun 29, 2005 6:45 pm

155 is kinda low for these motors.... check the valve clearance Jim <img src="http://img.photobucket.com/albums/v209/ ... Cheers.gif" style="border:0;"/> <img src="http://img.photobucket.com/albums/v209/ ... states.gif" style="border:0;"/> Hey Kid...Is my taillight working?Edited by: <A HREF=http://p072.ezboard.com/bexupbrotherhoo ... cer1951</A> at: 6/29/05 4:48 pm

djalbin · Post by **djalbin** » Wed Jun 29, 2005 9:36 pm

Mike, Compression on 1987 and 1988 models: standard = 160 psi max = 164 psi min = 145 psi max variation = 14 psi Compression on 1989-on models: standard = 199 psi max = 210 psi min = 194 psi max variation = 14 psi Unless you have a 1987-1988 model your 155 psi is low. Did you use a threaded compression gauge ? The recommended procedure is to test after the engine has reached normal operation temperature. Disable the igniton by unplugging the primary wires (label them first so you know where to plug them back in afterwards). Install the compression gauge. Hold the throttle wide open. Crank the engine a minimum of 4 or 5 revolutions (or until the gauge reading stops increasing). Observe the initial gauge reading and the final gauge reading. If the compression increased rapidly to the correct psi range then you're OK. Low initial compression that builds up gradually is indicating worn or sticking pistion rings. Low initial compresson that does not build up is indicating valve and valve seat leakage, or head gasket leakage. To determine the cause of the low compression ... insert a small amount of oil into the cylinder through the spark plug hole. The oil will seal the piston rings. Repeat the compression test. If the compression increases significantly then the piston rings or cylinders are worn. If the compression does not increase then it's valves or head gasket. The value problem could be valve clearance ... just like Jim said <img src=http://www.ezboard.com/images/emoticons/wink.gif ALT=";)"> or burned, warped, or cracked valves - or valve seats -or valves hanging up in the guides. If your bike is due for a valve adjustment that's where I would go. Recommended service interval is every 26K miles. Don

mynewbike · Post by **mynewbike** » Thu Jun 30, 2005 2:51 am

well I know we didn't have the engine warmed up and we never had the throttle open. Maybe that would explain why it's low? The bike is a 97 yzf1000r.I'm thinking it will need the valves adjusted since it has 27 k on it. I've got the carbs of now and will get them cleaned properly. If that doesn't help then I will start to worry. Mike

mynewbike · Post by **mynewbike** » Sat Jul 09, 2005 2:44 am

Well I finally got the bike running decent<img src=http://www.ezboard.com/images/emoticons/smile.gif ALT=":)"> My pilot jet was blocked on #3 and the float height was of by 3mm.Pilot jets are #17.5 and the screw turned out 2 turns. Bloody hell the bike is nothing but amazing<img src=http://www.ezboard.com/images/emoticons/smile.gif ALT=":)"> I mentioned my R1 front fork swap before so the bike is a tad lower in the front.I took it out for a get to know each other ride and had a blast. On the way home I finally opened her up in 2nd maybe 3/4 throttle,well holy smokes she lifted hear pretty little 17" rim and I had a smile that lasted for a good hr lol. I will need to install a steering dampener as she twitched a little on planting herself back on terra firma. Overall I'm very happy with her and love the torque. Thanx to everybodys know how it's been pretty straight forward getting her up and running. Thanx guys/gals Mike

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